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? 2005 fairchild semiconductor corporation ds500618 www.fairchildsemi.com april 2002 revised december 2005 nc7sbu3157 ? FSAU3157 low voltage spdt analog switch with 2v undershoot protection nc7sbu3157 ? FSAU3157 low voltage spdt analog switch with 2v undershoot protection general description the nc7sbu3157 or FSAU3157 is a high performance, single- pole/double-throw (spdt) analog switch or 2:1 multiplexer/ demultiplexer bus switch. the device is fabricated with advanced sub-micron cmos technology to achieve high speed enable and disable times and low on resistance. the break before make select circuitry prevents disruption of signals on the b port due to both switches temporarily being enabled dur- ing select pin switching. the device is specified to operate over the 1.65 to 5.5v v cc operating range. the control input toler- ates voltages up to 5.5v independent of the v cc operating range. fairchild?s integrated under shoot hardened circuit (uhc ) senses undershoot at the i/os , and responds by preventing voltage differentials from developing and turning the switch on. features useful in both analog and digital applications space saving sc70 6-lead surface mount package low on resistance: 10 on typ @ 3.3v v cc broad v cc operating range: 1.65v to 5.5v rail-to-rail signal handling power down high impedance control input overvoltage tolerance of control input to 7.0v break before make enable circuitry 250 mhz - 3db bandwidth available in lead (pb) free packaging ordering code: pb-free package per jedec j-std-020b. order number package number product code top mark package description supplied as nc7sbu3157p6x maa06a u7a 6-lead sc70, eiaj sc88, 1.25mm wide 3k units on tape and reel nc7sbu3157p6x_nl maa06a u7a pb-free 6-lead sc70, eiaj sc88, 1.25mm wide 3k units on tape and reel FSAU3157p6x maa06a u7a 6-lead sc70, eiaj sc88, 1.25mm wide 3k units on tape and reel
www.fairchildsemi.com 2 nc7sbu3157 ? FSAU3157 logic symbol analog symbol function table h high logic level l low logic level connection diagrams (top view) pin one orientation diagram aaa product code top mark - see ordering code. note: orientation of top mark determines pin one location. read the top product code mark left to right, pin one is the lower left pin (see diagram). pin descriptions input (s) function lb 0 connected to a hb 1 connected to a pin names description a, b 0 , b 1 data ports s control input
3 www.fairchildsemi.com nc7sbu3157 ? FSAU3157 absolute maximum ratings (note 1) recommended operating conditions (note 3) note 1: absolute maximum ratings are dc values beyond which the device may be damaged or have its useful life impaired. the datasheet specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. fairchild does not recommend oper- ation outside datasheet specifications. note 2: the input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. note 3: control input must be held high or low, it must not float. dc electrical characteristics note 4: measured by the voltage drop between a and b pins at the indicated current through the switch. on resistance is determined by t he lower of the voltages on the two (a or b ports). note 5: parameter is characterized but not tested in production. note 6: r on r on max r on min measured at identical v cc , temperature and voltage levels. supply voltage (v cc ) 0.5v to 7.0v dc switch voltage (v s ) (note 2) 0.5v to v cc 0.5v dc input voltage (v in ) (note 2) 0.5v to 7.0v dc input diode current (i ik ) @ (i ik ) v in 0v 50 ma dc output current (i out ) 128 ma dc v cc or ground current (i cc /i gnd ) 100 ma storage temperature range (t stg ) 65 c to 150 c junction temperature under bias (t j ) 150 c junction lead temperature (t l ) (soldering, 10 seconds) 260 c power dissipation (p d ) @ 85 c 180 mw supply voltage operating (v cc ) 1.65v to 5.5v control input voltage (v in )0v to v cc switch input voltage (v in )0v to v cc output voltage (v out )0v to v cc operating temperature (t a ) 40 c to 85 c input rise and fall time (t r , t f ) control input v cc 2.3v - 3.6v 0 ns/v to 10 ns/v control input v cc 4.5v - 5.5v 0 ns/v to 5 ns/v thermal resistance ( ja ) 350 c/w symbol parameter v cc t a 25 ct a 40 c to 85 c units conditions (v) min typ max min max v ih high level 1.65 1.95 0.75 v cc 0.75 v cc v input voltage 2.3 5.5 0.7 v cc 0.7 v cc v il low level 1.65 1.95 0.25 v cc 0.25 v cc v input voltage 2.3 5.5 0.3 v cc 0.3 v cc i in input leakage current 0 5.5 0.05 0.1 1 a0 v in 5.5v i oz off state leakage current 1.65 5.5 0.05 0.1 1 a0 a, b v cc r on switch on resistance 4.5 3.0 15.0 15.0 v in 0v, i o 30 ma (note 4) 5.0 15.0 15.0 v in 2.4v, i o 30 ma 7.0 15.0 15.0 v in 4.5v, i o 30 ma 3.0 4.0 20.0 20.0 v in 0v, i o 24 ma 10.0 20.0 20.0 v in 3v, i o 24 ma 2.3 5.0 30.0 30.0 v in 0v, i o 8 ma 13.0 30.0 30.0 v in 2.3v, i o 8 ma 1.65 6.5 50.0 50.0 v in 0v, i o 4 ma 17.0 50.0 50.0 v in 1.65v, i o 4 ma i cc quiescent supply current 5.5 1.0 10.0 a v in v cc or gnd all channels on or off i out 0 analog signal range v cc 0v cc 0v cc v r range on resistance 4.5 25.0 i a 30 ma, 0 v bn v cc over signal range 3.0 50.0 i a 24 ma, 0 v bn v cc (note 4)(note 8) 2.3 100 i a 8 ma, 0 v bn v cc 1.65 300 i a 4 ma, 0 v bn v cc r on on resistance match 4.5 0.15 i a 30 ma, v bn 3.15 between channels 3.0 0.2 i a 24 ma, v bn 2.1 (note 4)(note 5)(note 6) 2.3 0.5 i a 8 ma, v bn 1.6 1.65 0.5 i a 4 ma, v bn 1.15 v iku voltage undershoot 5.5 2.0 v 0.0 ma
i in
50 ma, oe 5.5v r flat on resistance flatness 5.0 6.0 i a 30 ma, 0 v bn v cc (note 4)(note 5)(note 7) 3.3 12.0 i a 24 ma, 0 v bn v cc 2.5 28.0 i a 8 ma, 0 v bn v cc 1.8 125 i a 4 ma, 0 v bn v cc
www.fairchildsemi.com 4 nc7sbu3157 ? FSAU3157 dc electrical characteristics (continued) note 7: flatness is defined as the difference between the maximum and minimum value of on resistance over the specified range of condit ions. note 8: guaranteed by design. ac electrical characteristics note 9: guaranteed by design. note 10: this parameter is guaranteed by design but not tested. the bus switch contributes no propagatio n delay other than the rc delay of the on resistance of the switch and the 50 pf load capacitance, when driven by an ideal voltage source (zero output impedance). note 11: off isolation 20 log 10 [v a / v bn ] symbol parameter v cc t a 25 ct a 40 c to 85 c units conditions figure (v) min typ max min max number t phl propagation delay 1.65 1.95 ns v i open figures 2, 3 t plh bus to bus 2.3 2.7 1.2 1.2 (note 10) 3.0 3.6 0.8 0.8 4.5 5.5 0.3 0.3 t pzl output enable time 1.65 1.95 7.0 23.0 7.0 24.0 ns figures 2, 3 t pzh turn on time 2.3 2.7 3.5 13.0 3.5 14.0 v i 2 x v cc for t pzl (a to b n )3.0 3.6 2.5 6.9 2.5 7.6 v i 0v for t pzh 4.5 5.5 1.7 5.2 1.7 5.7 t plz output disable time 1.65 1.95 3.0 12.5 3.0 13.0 ns figures 2, 3 t phz turn off time 2.3 2.7 2.0 7.0 2.0 7.5 v i 2 x v cc for t plz (a port to b port) 3.0 3.6 1.5 5.0 1.5 5.3 v i 0v for t phz 4.5 5.5 0.8 3.5 0.8 3.8 t b-m break before make time 1.65 1.95 0.5 0.5 ns figure 4 (note 9) 2.3 2.7 0.5 0.5 3.0 3.6 0.5 0.5 4.5 5.5 0.5 0.5 q charge injection (note 9) 5.0 7.0 pc c l 0.1 nf, v gen 0v figure 5 3.3 3.0 r gen 0 oirr off isolation (note 11) 1.65 5.5 57.0 db r l 50 figure 6 f 10mhz xtalk crosstalk 1.65 5.5 54.0 db r l 50 figure 7 f 10mhz bw 3db bandwidth 1.65 5.5 250 mhz r l 50 figure 10 thd total harmonic distortion 50.011 % r l 600 (note 9) 0.5 v p-p f 20 hz to 20 khz
5 www.fairchildsemi.com nc7sbu3157 ? FSAU3157 capacitance (note 12) note 12: t a 25 c, f 1 mhz, capacitance is characterized but not tested in production. undershoot characteristic (note 13) note 13: this test is intended to characterize the device?s protective ca pabilities by maintaining output signal integrity during an inp ut transient voltage undershoot event. figure 1. device test conditions transient input voltage (v in ) waveform symbol parameter typ max units conditions figure number c in control pin input capacitance 2.3 pf v cc 0v c io-b b port off capacitance 6.5 pf v cc 5.0v figure 8 c ioa-on a port capacitance when switch is enabled 18.5 pf v cc 5.0v figure 9 symbol parameter min typ max units conditions v outu output voltage during undershoot 2.5 v oh - 0.3 v figure 1 parameter value units v in see waveform v r 1 r 2 100k v tri 7.0 v v cc 5.5 v
www.fairchildsemi.com 6 nc7sbu3157 ? FSAU3157 ac loading and waveforms note: input driven by 50 source terminated in 50 note: c l includes load and stray capacitance note: input prr 1.0 mhz; t w 500 ns figure 2. ac test circuit figure 3. ac waveforms figure 4. break before make interval timing
7 www.fairchildsemi.com nc7sbu3157 ? FSAU3157 ac loading and waveforms (continued) figure 5. charge injection test figure 6. off isolation figure 7. crosstalk figure 8. channel off capacitance figure 9. channel on capacitance figure 10. bandwidth
www.fairchildsemi.com 8 nc7sbu3157 ? FSAU3157 tape and reel specification tape format tape dimensions inches (millimeters) package tape number cavity cover tape designator section cavities status status leader (start end) 125 (typ) empty sealed p6x carrier 3000 filled sealed trailer (hub end) 75 (typ) empty sealed package tape size dim a dim b dim f dim k o dim p1 dim w sc70-6 8 mm 0.093 0.096 0.138 0.004 0.053 0.004 0.157 0.315 0.004 (2.35) (2.45) (3.5 0.10) (1.35 0.10) (4) (8 0.1)
9 www.fairchildsemi.com nc7sbu3157 ? FSAU3157 reel dimensions inches (millimeters) tape sizeabcdn w1 w2 w3 8 mm 7.0 0.059 0.512 0.795 2.165 0.331 0.059/ 0.000 0.567 w1 0.078/ 0.039 (177.8) (1.50) (13.00) (20.20) (55.00) (8.40 1.50/ 0.00) (14.40) (w1 2.00/ 1.00)
www.fairchildsemi.com 10 nc7sbu3157 ? FSAU3157 physical dimensions inches (millimeters) unless otherwise noted 6-lead sc70, eiaj sc88, 1.25mm wide package number maa06a
11 www.fairchildsemi.com nc7sbu3157 ? FSAU3157 low voltage spdt analog switch with 2v undershoot protection disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation as used herein: 1. life support devices or s ystems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordanc e with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reason- ably expected to cause the failu re of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information formative or in design this datasheet contains the design specif ications for product develop- ment. specifications may change in any manner without notice. preliminary first production this datasheet contai ns preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. no identification needed full production this datasheet cont ains final specifications . fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. obsolete not in production this datasheet contains specifications on a product that has been dis- continued by fairchild semiconductor. the datasheet is printed for ref- erence information only.

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