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general description the max349/max350 are 8-channel and dual 4-channel serially controlled multiplexers (muxes). these muxes conduct equally well in either direction. on-resistance (100 max) is matched between switches to 16 max and is flat (10 max) over the specified signal range. these cmos devices can operate continuously with dual power supplies ranging from ?.7v to ?v or a sin- gle supply between +2.7v and +16v. each mux can handle rail-to-rail analog signals. the off-leakage current is only 0.1na at +25? or 5na at +85?. upon power-up, all switches are off and the internal shift registers are reset to zero. the serial interface is compatible with spi/qspi and microwire. functioning as a shift register, it allows data (at din) to be clocked in synchronously with the rising edge of clock (sclk). the shift register? output (dout) enables several max349s or max350s to be daisy chained. all digital inputs have 0.8v or 2.4v logic thresholds, ensuring both ttl and cmos-logic compatibility when using ?v supplies or a single +5v supply. ________________________applications serial data-acquisition industrial and process- systems control systems avionics ate equipment audio signal routing networking ____________________________features ? spi/qspi, microwire-compatible serial interface ? 8 separately controlled spst switches ? single 8-to-1 mux (max349) dual 4-to-1 mux (max350) ? 100 signal paths with ?v supplies ? rail-to-rail signal handling ? asynchronous reset input ? ?.7v to ?v dual supplies +2.7v to +16v single supply ? >2kv esd protection per method 3015.7 ? ttl/cmos-compatible inputs (with +5v or ?v supplies) max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers ________________________________________________________________ maxim integrated products 1 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 cs reset dout v- gnd din v+ sclk top view n.c. no7 no6 no5 no2 no1 no0 com 10 9 no4 no3 dip/so max349 logic 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 cs reset dout v- gnd din v+ sclk comb no0b no1b no2b no2a no1a no0a coma 10 9 no3b no3a dip/so max350 logic n.c. = not internally connected pin configurations/functional diagrams 19-0451; rev 1; 10/98 part max349 cpn max349cwn max349cap 0? to +70? 0? to +70? 0? to +70? temp. range pin-package 18 plastic dip 18 wide so 20 ssop ordering information ordering information continued at end of data sheet. *contact factory for dice specifications. max349c/d 0? to +70? dice* pin configurations continued at end of data sheet. spi and qspi are trademarks of motorola, inc. microwire is a trademark of national semiconductor corp. rail-to-rail is a registered trademark of nippon motorola, ltd. for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. for small orders, phone 1-800-835-8769.
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics?ual supplies (v+ = +4.5v to +5.5v, v- = -4.5v to -5.5v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltages referenced to gnd v+ ...........................................................................-0.3v, +17v v- ............................................................................-17v, +0.3v v+ to v-...................................................................-0.3v, +17v sclk, cs , din, dout, reset .................-0.3v to (v+ + 0.3v) no, com .................................................(v- - 2v) to (v+ + 2v) continuous current into any terminal..............................?0ma peak current, no or com (pulsed at 1ms, 10% duty cycle).................................?00ma continuous power dissipation (t a = +70?) 18-pin plastic dip (derate 11.11mw/? above +70?) ..889mw 18-pin so (derate 9.52mw/? above +70?)...............762mw 20-pin ssop (derate 8.00mw/? above +70?) ..........640mw 18-pin cerdip (derate 10.53mw/? above +70?).....842mw operating temperature ranges max349c_ _, max350c_ _ .................................0? to +70? max349e_ _, max350e_ _ ...............................-40? to +85? max349m_ _, max350m_ _ ...........................-55? to +125? storage temperature range .............................-65? to +150? lead temperature (soldering, 10sec) .............................+300? conditions units min typ max (note 1) symbol parameter 60 100 v v- v+ v com , v no analog signal range v+ = 5v, v- = -5v, v com = ?v, i no = 1ma 125 r on com-no on-resistance c, e, m t a = +25? c, e, m t a = +25? 16 c, e, m v+ = 5v, v- = -5v, v com = ?v, i no = 1ma 20 ? r on com-no on-resistance match between channels (note 2) t a = +25? 10 c, e, m v+ = 5v, v- = -5v, i no = 1ma, v com = -3v, 0v, 3v 15 r flat(on) com-no on-resistance flatness (note 2) t a = +25? -0.1 0.002 0.1 analog switch c, e -5 5 v+ = 5.5v, v- = -5.5v, v com = -4.5v, v no = 4.5v m -10 10 t a = +25? -0.1 0.002 0.1 c, e -5 5 no off-leakage current (note 3) i no(off) v+ = 5.5v, v- = -5.5v, v com = 4.5v, v no = -4.5v m -10 10 na t a = +25? -0.1 0.002 0.1 c, e -10 10 m -100 100 t a = +25? -0.1 0.002 0.1 c, e -5 5 v+ = 5.5v, v- = -5.5v, v com = ?.5v, v no = ?.5v m -50 50 t a = +25? -0.2 0.002 0.2 c, e -10 10 m -100 100 t a = +25? -0.2 0.002 0.2 c, e -5 5 com off-leakage current (note 3) i com(off) v+ = 5.5v, v- = -5.5v, v com = -4.5v, v no = 4.5v m -50 50 na max349 max349 max350 max350
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers _______________________________________________________________________________________ 3 electrical characteristics?ual supplies (continued) (v+ = +4.5v to +5.5v, v- = -4.5v to -5.5v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) v 2.4 c, e, m v ih din, sclk, cs, reset input voltage logic threshold high max350 na -50 50 m v+ = 5.5v, v- = -5.5v, v com = v no = ?.5v com on-leakage current (note 3) i com(on) -5 5 c, e max349 -0.2 0.02 0.2 t a = +25? -100 100 m -10 10 c, e dout output voltage logic low v dout v i dout = -1.6ma 0 0.4 c, e, m mv 100 c, e, m dout output voltage logic high v dout sclk hyst v i dout = 0.8ma sclk input hysteresis 2.8 v+ c, e, m ? -1 0.03 1 c, e, m v din , v sclk , v cs = 0.8v or 2.4v i ih, i il din, sclk, cs, reset input current logic high or low v 0.8 c, e, m v il din, sclk, cs , reset input voltage logic threshold low -0.2 0.001 0.2 t a = +25? turn-on time t on 400 ns from rising edge of cs c, e, m 200 275 t a = +25? -2 2 30 c, e, m c, e, m r l = 50 , c l = 15pf, v no = 1v rms , f = 100khz off-isolation v iso db pc pf pf charge injection (note 4) no off-capacitance com off-capacitance v cte c no(off) c com(off) v com = gnd, f = 1mhz c l = 1nf, v no = 0v, r s = 0 break-before-make delay t bbm 2 ns v no = gnd, f = 1mhz t a = +25? 2 t a = +25? 110 from rising edge of cs t a = +25? 540 t a = +25? parameter symbol min typ max (note 1) units v+ supply current i+ 720 ? v- supply current i- -1 0.1 1 ? turn-off time t off 300 ns from rising edge of cs c, e, m 90 150 t a = +25? din = cs = sclk = 0v or v+, reset = 0v or v+ din = cs = sclk = 0v or v+, reset = 0v or v+ channel-to-channel crosstalk v ct db < -90 r l = 50 , c l = 15pf, v no = 1v rms , f = 100khz t a = +25? switch on-capacitance c (on) > 90 c, e, m t a = +25? pf power-supply range v+, v- ? ? v t a = +25? 8 conditions v com = v no = gnd, f = 1mhz t a = +25? t a = +25? digital i/o switch dynamic characteristics power supply
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 4 _______________________________________________________________________________________ sclk frequency f sclk reset minimum pulse width t rw 70 ns t a = +25? fall time of dout (note 4) t df 100 ns 20% of v+ to 70% of v+, c l = 10pf c, e, m allowable fall time at din, sclk (note 4) t scf 2 ? 20% of v+ to 70% of v+, c l = 10pf c, e, m allowable rise time at din, sclk (note 4) t scr 2 ? 20% of v+ to 70% of v+, c l = 10pf c, e, m rise time of dout (note 4) t dr 100 ns 20% of v+ to 70% of v+, c l = 10pf c, e, m din data valid after falling sclk (note 4) t do 400 ns data hold time minimum data setup time t ds 17 100 ns t dh 0 -17 85 50% of sclk to 10% of dout, c l = 10pf sclk low time ns t cl c, e, m 190 ns t a = +25? c, e, m c, e, m parameter symbol min typ max (note 1) units c, e, m sclk high time cs lag time t csh2 240 ns t ch 190 cs lead time cycle time ns t ch +t cl 480 t css 240 ns c, e, m 0 2.1 ns mhz c, e, m c, e, m c, e, m c, e, m conditions serial digital interface timing characteristics?ual supplies (figure 1) (v+ = +4.5v to +5.5v, v- = -4.5v to -5.5v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) note 1: the algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. note 2: ? r on = r on(max) - r on(min) . on-resistance match between channels and on-resistance flatness are guaranteed only with specified voltages. flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. note 3: leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at room temp. note 4: guaranteed by design. note 5: leakage testing at single supply is guaranteed by testing with dual supplies. note 6: see figure 6. off-isolation = 20log 10 v com /v no , v com = output. no = input to off switch. note 7: between any two switches. see figure 3.
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers _______________________________________________________________________________________ 5 electrical characteristics?ingle +5v supply (v+ = +4.5v to +5.5v, v- = 0v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) t a = +25? c, e, m 125 175 c, e, m v v- v+ v com , v no analog signal range t a = +25? -0.1 0.002 0.1 t a = +25? -0.2 0.002 0.2 c, e c, e conditions -10 10 -10 10 v+ = 5v, v com = 3.5v, i no = 1ma m -100 100 t a = +25? m -100 100 t a = +25? -0.2 0.002 0.2 max349 c, e -5 5 m 225 r on com-no on-resistance -50 50 -0.1 0.002 0.1 na v+ = 5.5v, v com = 0v, v no = 4.5v max350 i com(off) com off-leakage current (notes 4, 5) t a = +25? -0.2 0.01 0.2 c, e -10 10 m -100 100 t a = +25? -0.2 0.02 0.2 max349 c, e -5 5 m max349 -50 50 c, e -5 5 m -50 50 v+ = 5.5v, v com = v no = ?.5v na max350 v+ = 5.5v, v com = 4.5v, v no = 0v i com(on) com on-leakage current (notes 4, 5) max350 units min typ max (note 1) symbol parameter t a = +25? -0.1 0.002 0.1 c, e -5 5 m v+ = 5.5v, v com = 4.5v, v no = 0v -10 10 c, e, m 2.4 c, e, m 0.8 v il v ih din, sclk, cs, reset input voltage logic threshold low din, sclk, cs, reset input voltage logic threshold high v v c, e, m -1 0.03 1 c, e, m 2.8 v+ c, e, m 0 0.4 i dout = -1.6ma i dout = 0.8ma v din , v sclk , v cs = 0.8v or 2.4v v dout v dout i ih , i il dout output voltage logic low dout output voltage logic high din, sclk, cs, reset input current logic high or low v v ? c, e, m 100 sclk hyst sclk input hysteresis mv t a = +25? 720 c, e, m 30 din = cs = sclk = 0v or v+, reset = 0v or v+ i+ v+ supply current ? t a = +25? -0.1 0.002 0.1 c, e -5 5 m v+ = 5.5v, v com = 0v, v no = 4.5v na -10 10 i no(off) no off-leakage current (notes 4, 5) digital i/o analog switch power supply
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 6 _______________________________________________________________________________________ electrical characteristics?ingle +5v supply (continued) (v+ = +4.5v to +5.5v, v- = 0v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) c l = 1nf, v no = 0v, r s = 0 v cte charge injection (note 4) pc db conditions t a = +25? t a = +25? 160 400 > 90 t a = +25? r l = 50 , c l = 15pf, v no = 1v rms , f = 100khz < -90 c, e, m from rising edge of cs ns db v iso v ct channel-to-channel crosstalk (note 7) off-isolation (note 6) r l = 50 , c l = 15pf, v no = 1v rms , f = 100khz 500 t on turn-on time t a = +25? 60 200 c, e, m from rising edge of cs ns 300 t off turn-off time units min typ max (note 1) symbol parameter t a = +25? 15 t a = +25? from rising edge of cs 110 ns t bbm break-before-make delay switch dynamic characteristics
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers _______________________________________________________________________________________ 7 timing characteristics?ingle +5v supply (figure 1) (v+ = +4.5v to +5.5v, v- = 0v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) serial digital interface serial digital interface rise time of dout (note 4) t dr 100 ns 20% of v+ to 70% of v+, c l = 10pf c, e, m allowable fall time at din, sclk (note 4) t scf 2 ? 20% of v+ to 70% of v+, c l = 10pf c, e, m allowable rise time at din, sclk (note 4) t scr 2 ? 20% of v+ to 70% of v+, c l = 10pf c, e, m din data valid after falling sclk (note 4) t do 400 ns data hold time (note 4) minimum data setup time (note 4) t ds 17 100 ns t dh -17 85 50% of sclk to 10% of dout, c l = 10pf sclk low time (note 4) ns t cl c, e, m 190 ns t a = +25? c, e, m c, e, m parameter symbol min typ max (note 1) units c, e, m sclk high time (note 4) cs lag time (note 4) t csh2 240 ns t ch 190 cs lead time (note 4) cycle time (note 4) sclk frequency f sclk ns 0 2.1 mhz t ch +t cl 480 t css 240 ns c, e, m ns c, e, m c, e, m c, e, m c, e, m conditions c, e, m 20% of v+ to 70% of v+, c l = 10pf ns 100 t df fall time of dout (note 4) note 1: the algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. note 2: ? r on = r on(max) - r on(min) . on-resistance match between channels and on-resistance flatness are guaranteed only with specified voltages. flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. note 3: leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at room temp. note 4: guaranteed by design. note 5: leakage testing at single supply is guaranteed by testing with dual supplies. note 6: see figure 6. off-isolation = 20log 10 v com /v no , v com = output. no = input to off switch. note 7: between any two switches. see figure 3. reset minimum pulse width t rw 70 ns t a = +25?
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 8 _______________________________________________________________________________________ v electrical characteristics?ingle +3v supply (v+ = +3.0v to +3.6v, v- = 0v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) t a = +25? c, e, m 270 500 c, e, m c, e, m 100 v v- v+ v com , v no c, e 2.4 analog signal range t a = +25? -0.1 0.002 0.1 t a = +25? -0.2 0.002 0.2 c, e c, e conditions -10 10 -10 10 v+ = 3.0v, v com = 1.5v, i no = 1ma m -100 100 t a = +25? m -100 100 t a = +25? -0.2 0.002 0.2 c, e 0.8 max349 c, e -5 5 m 600 r on com-no on-resistance -50 50 -0.1 0.002 0.1 na v+ = 3.6v, v com = 0v, v no = 3v sclk hyst max350 i com(off) com off-leakage current (notes 4, 5) t a = +25? -0.2 0.01 0.2 c, e -10 10 m -100 100 t a = +25? sclk input hysteresis -0.2 0.02 0.2 max349 mv c, e -5 5 m v il v ih max349 -50 50 c, e -5 5 m -50 50 v+ = 3.6v, v com = v no = 3v na max350 v+ = 3.6v, v com = 3v, v no = 0v i com(on) com on-leakage current (notes 4, 5) din, sclk, cs , reset input voltage logic threshold low din, sclk, cs , reset input voltage logic threshold high v v c, e -1 0.03 1 c, e, m 2.8 v+ c, e, m max350 0 0.4 units min typ max (note 1) symbol parameter i dout = -1.6ma i dout = 0.1ma v din , v sclk , v cs = 0.8v or 2.4v v dout v dout i ih , i il dout output voltage logic low dout output voltage logic high din, sclk, cs , reset input current logic high or low v v ? c, e, m 30 din = cs = sclk = 0v or v+, reset = 0v or 5v i+ v+ supply current ? t a = +25? 620 digital i/o analog switch power supply
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers _______________________________________________________________________________________ 9 max349/max350 electrical characteristics?ingle +3v supply (continued) (v+ = +3.0v to +3.6v, v- = 0v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) switch dynamic characteristics break-before-make delay (note 4) t bbm ns 110 from rising edge of cs t a = +25? 515 t a = +25? parameter symbol min typ max (note 1) units turn-off time (note 4) t off 400 ns from rising edge of cs c, e, m 120 300 t a = +25? turn-on time (note 4) t on 700 r l = 50 , c l = 15pf, v no = 1v rms , f = 100khz off-isolation (note 6) channel-to-channel crosstalk (note 7) v ct v iso db ns from rising edge of cs c, e, m < ?0 r l = 50 , c l = 15pf, v no = 1v rms , f = 100khz t a = +25? > 90 275 600 t a = +25? t a = +25? conditions db pc charge injection (note 4) v cte c l = 1nf, v no = 0v, r s = 0
note 1: the algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. note 2: ? r on = r on(max) - r on(min) . on-resistance match between channels and on-resistance flatness are guaranteed only with specified voltages. flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. note 3: leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at room temp. note 4: guaranteed by design. note 5: leakage testing at single supply is guaranteed by testing with dual supplies. note 6: see figure 6. off-isolation = 20log 10 v com /v no , v com = output. no = input to off switch. note 7: between any two switches. see figure 3. max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 10 ______________________________________________________________________________________ timing characteristics?ingle +3v supply (figure 1) (v+ = +3.0v to +3.6v, v- = 0v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) serial digital interface reset minimum pulse width (note 4) t rw 105 ns t a = +25? allowable fall time at din, sclk (note 4) t scf 2 ? 20% of v+ to 70% of v+, c l = 10pf c, e, m fall time of dout (note 4) t df 100 ns 20% of v+ to 70% of v+, c l = 10pf c, e, m rise time of dout (note 4) t dr 100 ns 20% of v+ to 70% of v+, c l = 10pf c, e, m allowable rise time at din, sclk (note 4) t scr 2 ? 20% of v+ to 70% of v+, c l = 10pf c, e, m din data valid after falling sclk (note 4) t do 400 ns data hold time (note 4) minimum data setup time (note 4) t ds 38 120 ns t dh -38 150 50% of sclk to 10% of dout, c l = 10pf sclk low time (note 4) ns t cl c, e, m 190 ns t a = +25? c, e, m c, e, m parameter symbol min typ max (note 1) units c, e, m sclk high time (note 4) cs lag time (note 4) t csh2 240 ns t ch 190 cs lead time (note 4) cycle time (note 4) sclk frequency f sclk ns 0 2.1 mhz t ch +t cl 480 t css 240 ns c, e, m ns c, e, m c, e, m c, e, m c, e, m conditions
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers ______________________________________________________________________________________ 11 0 -5 -3 1 on-resistance vs. v com (dual supplies) 40 120 max349/350-toc1 v com (v) r on ( w ) -1 3 80 140 20 100 60 5 -4 0 -2 2 4 v?= ?v v?= ?v v?= ?.5v 110 30 -5 -3 1 on-resistance vs. v com and temperature (dual supplies) 50 90 max349/350-toc2 v com (v) r on ( w ) -1 3 70 100 40 80 60 5 -4 0 -2 2 4 v?= ?.5v t a = +125? t a = +85? t a = +25? t a = -55? 0 04 on-resistance vs. v com (single supply) 100 300 max349/350-toc3 v com (v) r on ( w ) 8 200 400 350 50 250 150 21012 6 v+ = 3v v+ = 12v v+ = 5v v+ = 2.5v v- = 0v v+ = 9v 180 02 on-resistance vs. v com and temperature (single supply) 100 max349/350-toc4 v com (v) r on ( w ) 4 60 140 160 120 80 40 15 3 t a = +25? t a = -55? t a = +85? t a = +125? v+ = 5v v- = 0v 0.1 off-leakage vs. temperature 1,000 max349/350-toc5 temperature (?) off-leakage (pa) 10 1 100 -50 125 25 -25 0 75 50 100 v?= ?.5v 0.1 on-leakage vs. temperature 1,000 10,000 max349/350-toc6 temperature (?) on-leakage (pa) 10 1 100 -50 125 25 -25 0 75 50 100 v?= ?.5v __________________________________________typical operating characteristics (v+ = +5v, v- = -5v, gnd = 0v, t a = +25?, unless otherwise noted.) -5 -3 1 charge injection vs. v com -5 5 max349/350-toc7 v com (v) v cte (pc) -1 3 -4 4 -3 3 -2 2 -1 1 0 5 -4 0 -2 2 4 a: v+ = 5v, v- = -5v b: v+ = 5v, v- = 0v a b -5 -3 1 turn-on/turn-off times vs. v com 0 250 max349/350-toc8 v com (v) t on , t off (ns) -1 3 50 200 100 150 5 -4 0 -2 2 4 a = t on a: v+ = 5v, v- = 5v b: v+ = 5v, v- = 0v a = t off b = t off b = t on -50 04 data hold time vs. power-supply voltage -30 10 max349/350-toc9 supply voltage (v) data hold time (ns) 8 -10 30 40 50 20 -40 0 -20 26
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 12 ______________________________________________________________________________________ 0 04 data setup time vs. positive supply voltage 20 60 max349/350-toc10 supply voltage (v) data setup time (ns) 8 40 80 90 100 70 10 50 30 26 100 0.001 -50 125 power-supply current vs. temperature 10 1 max349/350-toc11 temperature (?) i+, i-, ( m a) 25 0.1 0.01 -25 0 75 50 100 v?= ?.5v i+ i- 10 04 minimum sclk pulse width vs. positive supply voltage 15 25 max349/350-toc12 supply voltage (v) sclk (ns) 8 20 30 35 26 0 -100 10k 100k 10m 1g frequency response -80 -20 max349/350 toc13 frequency (hz) loss (db) phase (degrees) 1m 100m -40 -60 20 -80 -100 -120 -60 0 -20 -40 phase off isolation insertion loss isolation of a bare socket v?= ?v 50w in and out 0.01 10 100 1k 10k total harmonic distortion vs. frequency 0.1 max349/350-toc14 frequency (hz) tdh (%) 1 10 100 v?= ?v 600 w in and out typical operating characteristics (continued) (v+ = +5v, v- = -5v, gnd = 0v, t a = +25?, unless otherwise noted.)
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers ______________________________________________________________________________________ 13 pin description note: no and com pins are identical and interchangeable. either may be considered as an input or an output; signals pass equally well in either direction. sclk din dout com-out cs t do t dh t ds t css t ch t cl t csh2 t on , t off figure 1. timing diagram 1 serial clock digital input 2 positive analog supply voltage input 3 serial data digital input 5 common analog switch (mux output) 6?3 normally open analog switch inputs 0? common analog switch ??(mux output) normally open analog switch ??inputs 0? normally open analog switch ??inputs 0? common analog switch b (mux output) 4 ground. connect to digital ground. (analog signals have no ground reference; they are limited to v+ and v-.) 1 sclk 2 v+ 3 din 5 com 6?, 11?4 no0?o7 coma no0a?o3a no3b?o0b comb 4 gnd 15 negative analog supply voltage input. connect to gnd for single-supply operation. 16 serial data digital output. output high is v+. 17 reset input. connect to logic high (or v+) for normal operation. drive low to set all switches off and set internal shift registers to 0. 18 chip-select digital input (figure 1) 17 v- 18 dout 19 reset 20 cs 14 no connect, not internally connected. 10, 15, 16 n.c. max349 ssop dip/so name function 1 2 3 5 6? 10?3 14 4 1 2 3 5 6? 11?4 15 4 15 16 17 18 17 18 19 20 10, 16 max350 ssop dip/so pin
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 14 ______________________________________________________________________________________ detailed description basic operation the max349/max350 are 8-channel and dual 4-chan- nel, serially controlled multiplexers (muxes). these muxes are unusual in that any, all, or none of the input channels can be directed to the output. all switches are bidirectional, so inputs and outputs are inter- changeable. when multiple inputs are connected to an output, they are also connected to one another, sepa- rated from each other only by the on-resistance of two switches. both parts require eight bits of serial data to set all eight switches. serial digital interface the max349/max350 interface can be thought of as an 8-bit shift register controlled by cs (figure 2). while cs is low, input data appearing at din is clocked into the shift register synchronously with sclk? rising edge. the input is an 8-bit word, each bit controlling one of the eight switches (tables 1 and 2). dout is the output of the shift register, with data appearing synchronously with sclk? falling edge. data at dout is simply the input data delayed by eight clock cycles. when shifting the input data, d7 is the first bit in and out of the shift register. while shifting data, the switches remain in their previous configuration. when the eight bits of data have been shifted in, cs is driven high. this updates the new switch configuration and inhibits further data from entering the shift register. transitions at din and sclk have no effect when cs is high, and dout holds the first input bit (d7) at its output. more or fewer than eight clock cycles can be entered during the cs low period. when this happens, the shift register contains only the last eight serial data bits, regardless of when they were entered. on the rising edge of cs , all switches are set to the corresponding states. the max349/max350 three-wire serial interface is compatible with spi, qspi, and microwire standards. if interfacing with a motorola processor serial interface, set cpol = 0. the max349/max350 are considered to be slave devices (figures 2 and 3). at power-up, the shift register contains all zeros, and all switches are off. the latch that drives the analog switch is updated on the rising edge of cs , regardless of sclk? state. this meets all spi and qspi requirements. daisy-chaining for a simple interface using several max349s and max350s, ?aisy-chain?the shift registers as shown in figure 5. the cs pins of all devices are connected, and a stream of data is shifted through the max349s or max350s in series. when cs is brought high, all switches are updated simultaneously. additional shift registers may be included anywhere in series with the max349/max350 data chain. note that the dout high level is v+, which may not be compatible with ttl/cmos devices if v+ differs from the logic supply for these other devices. addressable serial interface when several serial devices are configured as slaves, addressable by the processor, din pins of each decode logic individually control cs of each slave device. when a slave is selected, its cs pin is driven low, data is shifted in, and cs is driven high to latch the data. typically, only one slave is addressed at a time. dout is not used. applications information 8x1 multiplexer the max349 can be programmed normally, with only one channel selected for every eight clock pulses, or it can be programmed in a fast mode, where channel changing occurs on each clock pulse. in fast mode, select the channels by sending a single high pulse (corresponding to the selected channel) at din, and a corresponding cs low pulse for every eight clock puls- es. as sclk clocks this through the register, each switch sequences one channel at a time, starting with channel 0. d7 d6 d5 d4 msb lsb d3 d2 d1 d0 data bits from previous data input dout power-up default: d7?0 = 0 d6 d5 d4 d3 d2 d1 d0 d7 dout din sclk switches updated data clocked in data clocked out cs d7 input data bits figure 2. 3-wire interface timing
table 2. max350 serial-interface switch programming serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers max349/max350 ______________________________________________________________________________________ 15 x = don? care. data bit d7 is first bit in; data bit d0 is last in. x 1 switch 0 open (off) x x x x 0 x x x max349 function x x x x 1 1 x data bits switch 0 closed to com x 0 0 1 0 1 1 1 all switches open, d7?0 = 0 switch 7 open (off) all switches closed to com, d7?0 = 1 all switches open, d7?0 = 0 x x 1 x 1 x 1 1 1 switch 6 open (off) switch 5 open (off) switch 6 closed to com switch 7 closed to com x 1 x 1 x 1 x 1 switch 4 open (off) switch 3 open (off) switch 4 closed to com switch 5 closed to com x 1 x 1 x 1 x 1 switch 2 open (off) switch 1 open (off) switch 2 closed to com switch 3 closed to com d7 0 x 1 x 0 x 1 x x x x x x x x x d6 0 0 x x 1 x 1 x x x x 0 x 1 x x x x x d4 x x 0 x x x x x 1 x x x x d5 0 0 x x 1 x 1 x x x x x x x x 0 x 1 x d2 0 0 x x 1 x 1 reset x x x x x x x x x x x x x x x d0 x x x x x x x x x x x 0 x x d1 x x 0 x x x x x 1 d3 x x x x x 1 x 1 switch 1 closed to com x table 1. max349 serial-interface switch programming x 1 switch no0a open (off) x x x x 0 x x x max350 function x x x x 1 1 x data bits switch no0a closed x 0 0 1 0 1 1 1 all switches open, d7?0 = 0 switch no0b open (off) all ??switches closed to coma; all ? switches closed to comb, d7?0 = 1 all switches open, d7?0 = 0 x x 1 x 1 x 1 1 1 switch no1b open (off) switch no2b open (off) switch no1b closed switch no0b closed x 1 x 1 x 1 x 1 switch no3b open (off) switch no3a open (off) switch no3b closed switch no2b closed x 1 x 1 x 1 x 1 switch no2a open (off) switch no1a open (off) switch no2a closed switch no3a closed d7 0 x 1 x 0 x 1 x x x x x x x x x d6 0 0 x x 1 x 1 x x x x 0 x 1 x x x x x d4 x x 0 x x x x x 1 x x x x d5 0 0 x x 1 x 1 x x x x x x x x 0 x 1 x d2 0 0 x x 1 x 1 reset x x x x x x x x x x x x x x x d0 x x x x x x x x x x x 0 x x d1 x x 0 x x x x x 1 d3 x x x x x 1 x 1 switch no1a closed x
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 16 ______________________________________________________________________________________ sclk din dout cs sk so si i/o microwire port max349 max350 the dout-si connection is not required for writing to the max349/max350, but may be used for data-echo purposes. figure 3. connections for microwire dout din sclk cs miso mosi sck i/o spi port max349 max350 the dout-miso connection is not required for writing to the max349/max350, but may be used for data-echo purposes. cpol = 0, cpha = 0 figure 4. connections for spi and qspi sclk din cs max349 max350 sclk din cs max349 max350 sclk din cs max349 max350 dout dout dout sclk din cs to other serial devices figure 5. daisy-chained connection dual, differential 4-channel multiplexer the max350 can be programmed normally, with only one differential channel selected for every eight clock pulses, or it can be programmed in a fast mode, where channel changing occurs on each clock pulse. in fast mode, select the channels by sending two high pulses, spaced four clock pulses apart (corresponding to the two selected channels) at din, and a corre- sponding cs low pulse for each of the first eight clock pulses. as sclk clocks this through the register, each switch sequences one differential channel at a time, starting with channel 0. repeat this process for subse- quent channel sequencing after the first eight bits have been sent. for even faster channel sequencing, send only one din high pulse and one cs low pulse for every four clock pulses. reset function reset is the internal reset pin. it is usually connected to a logic signal or v+. drive reset low to open all switches and set the contents of the internal shift regis- ter to zero simultaneously. when reset is high, the part functions normally and dout is sourced from v+. reset must not be driven beyond v+ or gnd.
power-supply considerations overview the max349/max350 construction is typical of most cmos analog switches. it has three supply pins: v+, v- and gnd. v+ and v- are used to drive the internal cmos switches, and they set the limits of the analog voltage on any switch. reverse esd-protection diodes are internally connected between each analog signal pin and both v+ and v-. if any analog signal exceeds v+ or v-, one of these diodes will conduct. during normal operation, these (and other) reverse-biased esd diodes leak, forming the only current drawn from v+ or v-. virtually all the analog leakage current is through the esd diodes. although the esd diodes on a given sig- nal pin are identical, and therefore fairly well balanced, they are reverse biased differently. each is biased by either v+ or v- and the analog signal. this means their leakages vary as the signal varies. the difference in the two diode leakages to the v+ and v- pins constitutes the analog signal-path leakage current. all analog leak- age current flows to the supply terminals, not to the other switch terminal. this is why both sides of a given switch can show leakage currents of either the same or opposite polarity. there is no connection between the analog signal paths and gnd. v+ and gnd power the internal logic and logic-level translators, and set both the input and output logic lim- its. the logic-level translators convert the logic levels to switched v+ and v- signals to drive the analog signal gates. this drive signal is the only connection between the logic supplies (and signals) and the analog sup- plies. v+ and v- have esd-protection diodes to gnd. the logic-level inputs and output have esd protection to v+ and to gnd. the logic-level thresholds are cmos and ttl compati- ble when v+ is +5v. as v+ rises, the threshold increases slightly. therefore, when v+ reaches +12v, the threshold is about 3.1v; above the ttl-guaranteed high-level mini- mum of 2.8v, but still compatible with cmos outputs. max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers ______________________________________________________________________________________ 17 four clock pulses din sclk d4 sw4 d 0 sw 0 figure 7. differential multiplexer input control cs sclk din max349 max350 cs sclk din max349 max350 cs sclk din max349 max350 to other serial devices din sclk cs1 cs2 cs3 figure 6. addressable serial interface
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers 18 ______________________________________________________________________________________ pin configurations/functional diagrams (continued) 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 cs top view reset dout v- gnd din v+ sclk n.c. n.c. no7 no6 no2 no1 no0 com 12 11 9 10 no5 no4 n.c. no3 ssop max349 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 cs reset dout v- gnd din v+ sclk n.c. n.c. = not internally connected comb no0b no1b no2a no1a no0a coma 12 11 9 10 no2b no3b n.c. no3a ssop logic logic max350 bipolar supplies the max349/max350 operate with bipolar supplies from ?.0v and ?v. the v+ and v- supplies need not be symmetrical, but their sum cannot exceed the absolute maximum rating of 17v. do not connect the max349/max350 v+ to +3v and connect the logic- level pins to ttl logic-level signals. this exceeds the absolute maximum ratings and can damage the part and/or external circuits. single supply the max349/max350 operate from single supplies between +3v and +16v when v- is connected to gnd. all of the bipolar precautions must be observed. high-frequency performance in 50 systems, signal response is reasonably flat up to 50mhz (see typical operating characteristics) . above 20mhz, the on response has several minor peaks that are highly layout dependent. the problem is not turning the switch on, but turning it off. the off-state switch acts like a capacitor and passes higher frequen- cies with less attenuation. at 10mhz, off-isolation is about -45db in 50 systems, becoming worse (approx- imately 20db per decade) as frequency increases. higher circuit impedances also make off-isolation worse. adjacent channel attenuation is about 3db above that of a bare ic socket, and is entirely due to capacitive coupling.
v- no0a din no2a 0.120" (3.05mm) 0.100" (2.54mm) no3a no3b no2b comb no0b no1b v+ sclk cs reset dout coma gnd no1a max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers ______________________________________________________________________________________ 19 ordering information (continued) * contact factory for dice specifications. ** contact factory for availability. _________________chip topographies transistor count: 500 substrate connected to v+. 20 ssop -40? to +85? max350eap dice* 0? to +70? max350c/d 20 ssop -40? to +85? max349eap 18 cerdip** -55? to +125? max350mjn 18 wide so -40? to +85? max350ewn 18 plastic dip -40? to +85? max350epn 20 ssop 0? to +70? max350cap 18 wide so 18 plastic dip 0? to +70? 0? to +70? max350cwn max350 cpn 18 cerdip** -55? to +125? max349mjn 18 wide so 18 plastic dip pin-package temp. range -40? to +85? -40? to +85? max349ewn max349epn part max349 max350 v- no0 din no2 0.120" (3.05mm) 0.100" (2.54mm) no3 no4 no5 no7 no6 v+ sclk cs reset dout com gnd no1
max349/max350 serially controlled, low-voltage, 8-channel/dual 4-channel multiplexers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 1998 maxim integrated products printed usa is a registered trademark of maxim integrated products. ________________________________________________________package information ssop.eps soicw.eps

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