View MAX3490AEGSA_9020252.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ordering information appears at end of data sheet. general description devices in the max3483ae family (max3483ae/ max3485ae/max3488ae/max3490ae/max3491ae) are 20kv esd-protected rs-485/422 transceivers, optimized for extended cable runs in noisy environments. all devices operate from a single 3.3v supply. the max3483ae and max3485ae are half-duplex transceivers. the max3488ae, max3490ae, and max3491ae are full-duplex transceivers. all receivers feature a unit-load input impedance, allowing up to 32 devices on a single bus. each transceiver includes a fail-safe receiver, ensuring that the receiver output (ro) is high when inputs are shorted, open, or connected to a tri-state bus. all devices feature enhanced electrostatic discharge (esd) protection. all transmitter outputs and receiver inputs are protected to 20kv hbm esd, 15kv air-gap esd and 8kv contact esd in accordance to iec 61000-4-2. the max3483ae, max3485ae, max3488ae, and max3490ae are available in industry standard 8-pin so package, while the max3491ae is available in a 14-pin so package. benefts and features integrated protection increases robustness ? high esd protection 20kv hbm esd per jedec js-001-2012 15kv air gap per iec 61000-4-2 8kv contact esd per iec 61000-4-2 ? short-circuit protected outputs ? true fail-safe receiver prevents false transition on receiver input short or open events ? hot-swap capability eliminates false transitions during power-up or hot insertion high-speed data rates up to 20mbps up to -40c to +125c operating temperature allows up to 128 transceivers on the bus applications industrial-control local area networks transceivers for emi-sensitive applications telecommuncations 19-8506; rev 0; 3/16 m a x 3 4 9 1 a e v c c r o d i y z b a d e r e d r m a x 3 4 8 8 a e m a x 3 4 9 0 a e s h u t d ow n v c c r o r e d e d i y z b a d r r d s h u t d o w n r o r e d e d i a b m a x34 8 3 ae m a x34 8 5 ae functional diagram max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers
(voltages referenced to gnd.) v cc ..................................................................... -0.3v to +4.0v ro ............................................................ -0.3v to (v cc + 0.3v) re, de, di ............................................................ -0.3v to +3.6v a, b, y, z ............................................................ -9.0v to +13.0v short-circuit duration (ro, a, b, y, z) to gnd ......... continuous operating temperature range max3483ae/85ae/88ae/90ae/91ae .......... -40c to +125c max3488ae/90ae ....................................... -40c to +105c junction temperature ...................................................... +150c storage temperature range ............................ -65 c to +150c continuous power dissipation (t a = +70c) 8 so (derate at 7.6mw/c above +70c) ................... 606mw 14 so (derate at 11.9mw/c above +70c) ............... 952mw lead temperature (soldering, 10s) ................................. +300c soldering temperature (reflow) ...................................... +260c junction-to-case thermal resistance ( jc ) 8-pin so ...................................................................... 38c/w 14-pin so .................................................................... 34c/w junction-to-ambient thermal resistance ( ja ) 8-pin so .................................................................... 132c/w 14-pin so .................................................................... 84c/w (note 1) (v cc = +3.0v to +3.6v, t a = t min to t max , unless otherwise specified. typical values are at v cc = +3.3v and t a = +25 c.) (notes 2, 3) parameter symbol conditions min typ max units power supply supply voltage v cc 3.0 3.6 v supply current i cc de = v cc , re = gnd, no load 1.9 4 ma de = 0, re = 0, no load, di = 0 or v cc 1.2 4.0 shutdown supply current i shdn de = gnd, re = v cc max3483ae/85ae/91ae 10 a driver differential driver output v od v cc = 3v, r l = 100, figure 1 2.0 v v cc = 3v, r l = 54, figure 1 1.5 change in magnitude of differential output voltage ?v od r l = 54 or 100, figure 1 (note 4) -0.2 +0.2 v driver common-mode output voltage v oc r l = 54 or 100, figure 1 v cc /2 3 v change in magnitude of common- mode voltage v oc r l = 54 or 100, figure 1 (note 4) -0.2 +0.2 v single-ended driver output high v oh a or b output, i a or b = -20ma 2.2 v single-ended driver output low v ol a or b output, i a or b = 20ma 0.8 v driver short-circuit output current i osd v out = -7v -250 ma v out = +12v 250 ma note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to zzzdhjdhgfrhdoxrdo . evroxh0dx5djv stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to ab solute maximum rating conditions for extended periods may affect device reliability. 3dfndh7hpdddfwhlwlf (hfwlfdddfwhlwlf maxim integrated 2 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
(v cc = +3.0v to +3.6v, t a = t min to t max , unless otherwise specified. typical values are at v cc = +3.3v and t a = +25 c.) (notes 2, 3) parameter symbol conditions min typ max units receiver input current i a, b de = gnd, v cc = gnd or +3.6v v in = +12v 430 1000 a v in = -7v -450 300 differential input capacitance c a, b between a and b, de = gnd, f = 4mhz 12 pf receiver differential threshold voltage v th -7v v cm +12v -200 -105 -10 mv receiver input hysteresis v th v cm = 0v 10 mv receiver input resistance r in -7v v cm +12v, max3483ae/85ae 12 k -7v v cm +12v, max3488ae/90ae/91ae 48 logic interface (di, de, re , ro) input voltage high v ih de, di, re 2.0 v input voltage low v il de, di, re 0.8 v input hysteresis v hys de, di, re 50 mv input current i in de, di, re 2 a input impedance on first transition de, re 1 10 k ro output voltage high v ohro re = gnd, i ro = -2ma, (v a - v b ) > 200mv v cc - 1.5 v ro output voltage low v olro = gnd, i ro = 2ma, (v a - v b ) < -200mv 0.4 v receiver three-state output current i ozr re = v cc , 0 v ro v cc 1 a re pulldown and de pullup resistance r in 1 m receiver output short-circuit current i osr 0 v ro v cc 110 ma protection thermal shutdown threshold t shdn temperature rising +160 c thermal shutdown hysteresis 15 c esd protection on a, b, z, and y pins iec 61000-4-2 air gap discharge to gnd 15 kv iec 61000-4-2 contact discharge to gnd 8 human body model to gnd 20 esd protection, all other pins human body model 2 kv electrical characteristics (continued) maxim integrated 3 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
(v cc = +3v to +3.6v, t a = t min to t max , unless otherwise specified. typical values are at v cc = +3.3v and t a = +25c.) (notes 2, 3, 5) parameter symbol conditions min typ max units driver driver propagation delay t dplh r l = 54, c l = 50pf, figures 2 and 3 30 ns t dphl 30 driver differential output rise or fall time t hl , t lh r l = 54, c l = 50pf, figures 2 and 3 7 ns differential driver output skew |t dplh - t dphl | t dskew r l = 54, c l = 50pf, figures 2 and 3 (note 6) 3 ns maximum data rate dr max 20 mbps driver enable to output high t dzh r l = 110, c l = 50pf, max3485ae, max3491ae figures 4 and 5 (note 7) 40 ns driver enable to output low t dzl r l = 110, c l = 50pf, max3485ae, max3491ae figures 4 and 5 (note 7) 40 ns driver disable time from low t dlz r l = 110, c l = 50pf, max3485ae, max3491ae figures 4 and 5 40 ns driver disable time from high t dhz r l = 110, c l = 50pf, max3485ae, max3491ae figures 4 and 5 40 ns driver enable from shutdown to output high t dlz(shdn) r l = 110, c l = 15pf, max3485ae, figures 4 and 5 (note 7) 6 s max3491ae 100 s driver enable from shutdown to output low t dhz(shdn) r l = 110, c l = 15pf, max3485ae figures 4 and 5 (note 7) 6 s time to shutdown t shdn (note 8) 50 800 ns receiver receiver propagation delay t rplh c l = 15pf, figures 6 and 7 35 ns t rphl 35 receiver output skew t rskew c l = 15pf, figures 6 and 7 (note 6) 2 ns maximum data rate dr max 20 mbps receiver enable to output high t rzh r l = 1k, c l = 15pf, max3485ae, max3491ae, figure 8 (note 7) 40 ns receiver enable to output low t rzl r l = 1k, c l = 15pf, max3485ae, max3491ae, figure 8 (note 7) 40 ns receiver disable time from low t rlz r l = 1k, c l = 15pf, max3485ae, max3491ae, figure 8 40 ns switching characteristics max3485ae/max3490ae/max3491ae maxim integrated 4 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
(v cc = +3v to +3.6v, t a = t min to t max , unless otherwise specified. typical values are at v cc = +3.3v and t a = +25c.) (notes 2, 3, 5) (v cc = +3v to +3.6v, t a = t min to t max , unless otherwise specified. typical values are at v cc = +3.3v and t a = +25c.) (notes 2, 3, 5) parameter symbol conditions min typ max units receiver disable time from high t rhz r l = 1k, c l = 15pf, max3485ae, max3491ae figure 8 40 ns receiver enable from shutdown to output high t rlz(shdn) r l = 1k, c l = 15pf, max3485ae, figure 8 (note 7) 6 s max3491ae 100 s receiver enable from shutdown to output low t rhz(shdn) r l = 1k, c l = 15pf, max3485ae, figure 8 (note 7) 6 s max3491ae 100 s time to shutdown t shdn (note 8) 50 800 ns parameter symbol conditions min typ max units driver driver propagation delay t dplh r l = 54, c l = 50pf, figures 2 and 3 1000 ns t dphl 1000 driver differential output rise or fall time t hl , t lh r l = 54, c l = 50pf, figures 2 and 3 200 900 ns differential driver output skew |t dplh - t dphl | t dskew r l = 54, c l = 50pf, figures 2 and 3 140 ns maximum data rate dr max 500 kbps driver enable to output high t dzh r l = 110, c l = 50pf, max3483ae figures 4 and 5 (note 6) 2500 ns driver enable to output low t dzl r l = 110, c l = 50pf, max3483ae figures 4 and 5 (note 6) 2500 ns driver disable time from low t dlz r l = 110, c l = 50pf, max3483ae figures 4 and 5 100 ns driver disable time from high t dhz r l = 110, c l = 50pf, max3483ae figures 4 and 5 100 ns driver enable from shutdown to output high t dlz(shdn) r l = 110, c l = 15pf, max3483ae figures 4 and 5 (note 6) 10 s switching characteristics (max3483ae/max3488ae) switching characteristics max3485ae/max3490ae/max3491ae (continued) maxim integrated 5 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
(v cc = +3v to +3.6v, t a = t min to t max , unless otherwise specified. typical values are at v cc = +3.3v and t a = +25c.) (notes 2, 3, 5) note 2: all devices 100% production tested at t a = +25c. specifications over temperature are guaranteed by design. note 3: all currents into the device are positive; all currents out of the device are negative. all voltages are referenced to ground, unless otherwise noted. note 4: v od and v oc are the changes in v od and v oc , respectively, when the di input changes state. note 5: capacitive load includes test probe and fixture capacitance. note 6: guaranteed by design; not production tested. note 7: the timing parameter refers to the driver or receiver enable delay, when the device has exited the initial hot-swap protect state and is in normal operating mode. note 8: shutdown is enabled by driving re high and de low. the device is guaranteed to have entered shutdown after t shdn has elapsed. parameter symbol conditions min typ max units driver enable from shutdown to output low t dhz(shdn) r l = 110, c l = 15pf, max3483ae figures 4 and 5 (note 6) 5.5 s time to shutdown t shdn (note 8) max3483ae 50 340 700 ns receiver receiver propagation delay t rplh c l = 15pf, figures 6 and 7 200 ns t rphl 200 receiver output skew t rskew c l = 15pf, figures 6 and 7 (note 6) 30 ns maximum data rate dr max 500 kbps receiver enable to output high t rzh r l = 1k, c l = 15pf, max3483ae figure 8 (note 6) 50 ns receiver enable to output low t rzl r l = 1k, c l = 15pf, max3483ae figure 8 (note 6) 50 ns receiver disable time from low t rlz r l = 1k, c l = 15pf, max3483ae figure 8 50 ns receiver disable time from high t rhz r l = 1k, c l = 15pf, max3483ae figure 8 50 ns receiver enable from shutdown to output high t rlz(shdn) r l = 1k, c l = 15pf, max3483ae figure 8 (note 6) 10 s receiver enable from shutdown to output low t rhz(shdn) r l = 1k, c l = 15pf, max3483ae figure 8 (note 6) 10 s time to shutdown t shdn (note 8) max3483ae 50 340 800 ns switching characteristics (max3483ae/max3488ae) (continued) maxim integrated 6 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
figure 1. driver dc test load figure 2. driver timing test circuit figure 3. driver propagation delays v od a b v oc r l 2 r l 2 r l c l v od v cc di de a b 1.5v 1.5v t dphl t dplh v od 0 b a di 10% 90% 10% 90% 0 -v o v od t dskew = | t dplh - t dphl | v od = [v a - v b ] v cc v o t lh = 3ns, t hl = 3ns t lh t hl test and timing diagrams maxim integrated g max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
figure 4. driver enable and disable times (t dzh, t dhz ) figure 5. driver enable and disable times (t dzl , t dlz ) figure 6. receiver propagation delay test circuit 0 0 0.25v 1.5v t dzh , t dzh(shdn) t dhz de v cc v oh 1.5v out r l = 110? 50? out s1 a b d di gnd or v cc generator de c l 50pf r l = 110? 50? out s1 a b d di 0 or v cc v cc generator de 0 0.25v 1.5v t dzl , t dzl(shdn) t dlz de v cc 1.5v v cc out v ol v id b a ro ate r maxim integrated g 8 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
figure 8. receiver enable and disable times figure 7. receiver propagation delays generator 50? r 1k? c l 15pf r -1.5v +1.5v ro s1 v cc s2 s3 v id re re ro re ro re re ro ro 0 t rhz t rlz 0.25v 0.25v 1.5v 1.5v 0 0 2 s1 open s2 closed s3 = +1.5v s1 open s2 closed s3 = +1.5v s1 closed s2 open s3 = -1.5v s1 closed s2 open s3 = -1.5v v oh 0 0 v oh v cc v cc v cc 1.5v 1.5v v cc t rzl , t rzl(shdn) v ol 0 v cc v cc v cc v ol t rzh, t rzh(shdn) 2 v cc a b v oh v ol ro t rphl 1.5v 1.5v t rskew = |t rphl - t rplh | t rplh -1v 1v maxim integrated 9 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
(v cc = +3.3v, t a = +25 c, unless otherwise specified.) 0 0.5 1 1.5 2 2.5 3 -40 -25 -10 5 20 35 50 65 80 95 110 125 supply curent (ma) temperature ( c) no load supply current vs. temperature toc01 de = v cc re = gnd max3483ae max3485ae max3488ae/90ae/91ae 0 5 10 15 20 25 30 -40 -25 -10 5 20 35 50 65 80 95 110 125 supply curent (ma) temperature ( c) shutdown supply current vs. temperature toc02 de = gnd re = v cc max3483ae max3488ae/90ae/91ae max3485ae 0 10 20 30 40 50 60 0 50 100 150 200 250 supply curent (ma) data rate (kbps) max3483ae/88ae - 500kbps supply current vs. data rate toc03 max3483ae, 54 load max3488ae, 54 load max3488ae, no load max3483ae no load de = v cc 0 10 20 30 40 50 60 0 5 10 15 20 supply current (ma) data rate (mbps) max3485ae/90ae/91ae C 20mbps supply current vs. data rate toc04 max3490ae/91ae, no load max3485ae, no load max3485ae, 54? load max3490ae/91ae, 54 ? load de = v cc re = gnd 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 10 20 30 40 v oh (v) output current (ma) receiver output high voltage vs. output current toc05 output sourcing current max3483ae/85ae max3488ae/90ae/91ae 0 1 2 3 4 5 0 10 20 30 40 50 60 output low voltage (v) output current (ma) receiver output low voltage vs. output current toc06 max3483ae/85ae max3488ae/90ae/91ae output sinking current 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 -40 -25 -10 5 20 35 50 65 80 95 110 125 differential driver output voltage (v) temperature ( c) differential driver output voltage vs. temperature toc07 max3488ae/90ae91ae max3483ae/85ae 340 345 350 355 360 365 370 375 380 -40 -25 -10 5 20 35 50 65 80 95 110 125 propagation delay (ns) temperature ( c) max3483ae/88ae - 500kbps driver propagation delay vs. temperature toc8 t dplh , max3483ae t dplh , max3488ae t dphl , max3483ae t dphl , max3488ae r l = 54 c l = 50pf 7slfdo2shudwlkdudfwhulvwlfv maxim integrated 10 www.maximintegrated.com max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers
(v cc = +3.3v, t a = +25 c, unless otherwise specified.) 10 12 14 16 18 20 22 -40 -25 -10 5 20 35 50 65 80 95 110 125 propagation delay (ns) temperature ( c) max3485ae/90ae/91ae - 20mbps driver propogation delay vs. temperature toc9 t dphl , max3485ae t dphl , max3490ae/91ae t dplh , max3490ae/91ae t dplh , max3485ae r l = 54 c l = 50pf -4 -2 0 2 4 6 8 10 12 14 16 18 20 -40 -25 -10 5 20 35 50 65 80 95 110 125 differential driver skew (ns) temperature ( c) max3483ae/88ae C 500kbps differential driver skew vs. temperature toc10 max3488ae max3483ae r l = 54 c l = 50pf 0 1 2 3 4 5 6 7 8 9 10 -40 -25 -10 5 20 35 50 65 80 95 110 125 differential driver skew (ns) temperature ( c) max3485ae/90ae/91ae differential driver skew vs. temperature toc11 r l = 54 c l = 50pf max3490ae/91ae max3485ae 0 50 100 150 200 250 300 350 400 450 -40 -25 -10 5 20 35 50 65 80 95 110 125 differential output rise/fall time (ns) temperature ( c) max3483ae/88ae driver output rise and fall time vs. temperature toc12 t lh , max3488ae r l = 54 c l = 50pf t hl , max3488ae t lh , max3483ae t hl , max3483ae 0 1 2 3 4 5 6 7 8 -40 -25 -10 5 20 35 50 65 80 95 110 125 driver output rise/fall time (ns) temperature ( c) max3485ae/90ae/91ae driver output rise/fall time vs. temperature toc13 t hl , max3490ae/91ae r l = 54 c l = 50pf t hl , max3485ae t lh , max3490ae/91ae t lh , max3485a 0 5 10 15 20 25 30 35 40 45 50 55 60 -40 -25 -10 5 20 35 50 65 80 95 110 125 driver output transition skew (ns) temperature ( c) max3483ae/88ae driver output transition skew vs. temperature toc14 r l = 54 c l = 50pf max3488ae max3483ae 0 0.5 1 1.5 2 2.5 3 3.5 4 -40 -25 -10 5 20 35 50 65 80 95 110 125 driver output transition skew (ns) temperature ( c) max3485ae/90ae/91ae driver output transition skew vs. temperature toc15 r l = 54 c l = 50pf max3485ae max3490ae/91ae typical operating characteristics (continued) maxim integrated 11 www.maximintegrated.com max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers
t o p v i e w s o v c c + r o d i 1 2 3 4 8 7 6 5 g n d a b z y m a x 348 8 a e m a x 349 0 a e a b d e 1 2 1 4 1 3 v c c n . c . r o r e n . c . 3 4 1 2 1 1 y n . c . g n d 5 1 0 z d i g n d 6 7 9 8 + m a x 349 0 a e s o s o v c c b a g n d 8 7 6 5 1 2 3 4 r o r e d e d i m a x 3483 a e m a x 3485 a e + pin name function max3483ae max3485ae max3488ae max3490ae max3491ae 1, 8, 13 n.c. no connection. not internally connected. 1 2 2 ro receiver output. drive re low to enable ro. ro is always active on the max3488ae and max3490ae. ro is high when the receiver inputs (va - vb) > -10mv and low when (va -vb) 200mv. see the function tables. 2 3 re receiver output enable. drive re low, or leave unconnected, to enable ro. ro is high impedance when re is high. drive re high and de low to enter low-power shutdown mode. re has a weak pulldown to gnd. 3 4 de driver enable. drive de high, or leave unconnected, to enable the driver outputs (y and z for full duplex, a and b for half duplex). the driver outputs are high impedance when de is low. drive re high and de low to enter low-power shutdown mode. de has a weak pullup to v cc . 4 3 5 di driver input. a low on di forces the noninverting output (y or a) low and the inverting output (z or b) high. similarly, a high on di forces the noninverting output (y or a) high and the inverting output (z or b) low. see the function tables. 5 4 6, 7 gnd ground 5 9 y noninverting driver output 6 10 z inverting driver output 7 7 11 b inverting receiver input/driver output (max3483ae/max3485ae). inverting receiver input (max3488ae/max3490ae/max3491ae). 6 8 12 a noninverting receiver input/driver output (max3483ae/max3485ae). noninverting receiver input (max3488ae/max3490ae/max3491ae). 8 1 14 v cc positive supply. bypass v cc to gnd with a 0.1f capacitor as close as possible to the ic. pin description pin confguration maxim integrated 12 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
x = dont care * re and de on the max3488ae and max3490ae are internal. the driver outputs and receiver are always active in these devices. transmitting inputs outputs re * de* di y z x 1 1 1 0 x 1 0 0 1 0 0 x high-impedance 1 0 x shutdown receiving inputs output re* de* v a - v b ro 0 x -10mv 1 0 x -200mv 0 0 x open/shorted 1 1 1 x high-impedance 1 0 x shutdown transmitting inputs outputs mode re de di b a x 1 1 0 1 active x 1 0 1 0 active 0 0 x high impedance driver disabled 1 0 x high impedance shutdown receiving inputs outputs mode re de a-b ro 0 x -10mv 1 active 0 x -200mv 0 active 0 x open/shorted 1 active 1 1 x high impedance receiver disabled 1 0 x high impedance shutdown function tables (max3483ae, max3485ae) function tables max3491ae maxim integrated 13 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
detailed description the max3483ae/85ae and max3488ae/90ae/91ae family are 3.3v esd-protected rs-485/rs-422 transceivers intended for half-duplex or full-duplex communications. integrated hot-swap functionality eliminates false transitions on the bus during power-up or hot insertion. the device features fail-safe receiver inputs guaranteeing a logic-high receiver output when inputs are shorted or open. the max3483ae/85ae has a 1-unit load receiver input impedance, allowing up to 32 transceivers on the bus. the max3488ae/90ae/91ae has a 1/4-unit load receiver input impedance, allowing up to 128 transceivers on the bus. true fail safe the transceiver family guarantee a logic-high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. if the differential receiver input voltage (aCb) is greater than or equal to -10mv, ro is logic-high. driver single-ended operation the driver outputs can either be used in the standard differential operating mode, or can be used as single-ended outputs. since the driver outputs swing rail-to-rail, they can individually be used as standard ttl logic outputs. for half-duplex transceivers, driver outputs are a and b. for full-duplex transceivers, driver outputs are y and z. hot-swap capability hot-swap inputs when circuit boards are inserted in a hot or powered backplane, disturbances on the enable inputs and differential receiver inputs can lead to data errors. upon initial circuit board insertion, the processor undergoes its power-up sequence. during this period, the processor output drivers are high impedance and are unable to drive the de and re inputs max3483ae/85ae/91ae to a defined logic level. leakage currents up to 10a from the high-impedance outputs of a controller could cause de and re to drift to an incorrect logic state. additionally, parasitic circuit board capacitance could cause coupling of v cc or gnd to de and re . these factors could improperly enable the driver or receiver. the integrated hot-swap inputs help to avoid these potential problems. when v cc rises, an internal pulldown circuit holds de low and re high. after the initial power-up sequence, the pulldown circuit becomes transparent, resetting the hot- swap-tolerable inputs. hot-swap input circuitry the de and re enable inputs feature hot-swap capability. at the input, there are two nmos devices, m1 and m2 ( figure 9 ). when v cc ramps from 0v, an internal 10s timer turns on m2 and sets the sr latch that also turns on m1. transistors m2 (a 500a current sink) and m1 (a 100a current sink) pull de to gnd through a 5k (typ) figure 9. simplified structure of the driver enable (de) pin v cc timer de timer 5k? (typ) 10s 100a 500a m2 m1 driver enable (hot swap) maxim integrated 14 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
resistor. m2 is designed to pull de to the disabled state against an external parasitic capacitance up to 100pf that can drive de high. after 10s, the timer deactivates m2 while m1 remains on, holding de low against three-state leakages that can drive de high. m1 remains on until an external source overcomes the required input current. at this time, the sr latch resets and m1 turns off. when m1 turns off, de reverts to a standard, high-impedance cmos input. whenever v cc drops below 1v, the hot- swap input is reset. a complementary circuit employing two pmos devices pulls re to v cc . 20kv esd protection esd protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. the driver outputs and receiver inputs have extra protection against static electricity. the esd structures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, the transceiver family keeps working without latch-up or damage. esd protection can be tested in various ways. the transmitter outputs and receiver inputs are characterized for protection to the following limits: 20kv hbm 15kv using the air-gap discharge method specified in iec 61000-4-2 8kv using the contact discharge method specified in iec 61000-4-2 esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model (hbm) figure 10 shows the hbm, and figure 11 shows the current waveform it generates when discharged into a low- impedance state. this model consists of a 100pf capacitor charged to the esd voltage of interest, which is then discharged into the test device through a 1.5k resistor. iec 61000-4-2 the iec 61000-4-2 standard covers esd testing and performance of finished equipment. however, it does not specifically refer to integrated circuits. the transceiver family helps in designing equipment to meet iec 61000-4-2 without the need for additional esd protection components. the major difference between tests done using the hbm and iec 61000-4-2 is higher peak current in iec 61000-4-2 because series resistance is lower in the iec 61000-4-2 model. hence, the esd withstand voltage measured to iec 61000-4-2 is generally lower than that measured using the hbm. figure 10. human body esd test model figure 11. human body current waveform charge current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m? r d 1.5k? high- voltage dc source device under test i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amperes maxim integrated 15 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
figure 12 shows the iec 61000-4-2 model, and figure 13 shows the current waveform for iec 61000-4-2 esd contact discharge test. applications information driver output protection two mechanisms prevent excessive output current and power dissipation caused by faults or by bus connection. the first, a current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range. the second, a thermal- shutdown circuit, forces the driver outputs into a high- impedance state if the die temperature exceeds +160c (typ). low-power shutdown mode (max3483ae, max3485ae,max3491ae) low-power shutdown mode is initiated by bringing re high and de low. in shutdown, the devices draw less than 10a of supply current. re and de can be connected together and driven simul - taneously. the transceiver is guaranteed not to enter shutdown if re is high and de is low for less than 50ns. if the inputs are in this state for at least 800ns (max), the device is guaranteed to enter shutdown. typical applications the transceiver family is designed for bidirectional data communications on multipoint bus transmission lines. figure 14 and figure 15 show typical network application circuits. to minimize reflections, terminate the line at both ends with its characteristic impedance and keep stub lengths off the main line as short as possible. figure 12. iec 61000-4-2 esd test model figure 14. typical application circuit figure 13. iec 61000-4-2 esd generator current waveform charge current- limit resistor discharge resistance storage capacitor c s 150pf r c 50m ? to 100m ? r d 330 ? high- voltage dc source device under test di ro de a b ro ro ro di di di de de de d d d r r r b b b a a a 120 ? 120 ? d r re re re re max3483ae/85ae t r = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% i peak i maxim integrated 16 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
figure 15. typical half-duplex rs-485 network ro de di y z b a re r d ro de di y z b a re r d ro de di y z b a re r d ro de di y z b a re r d max 3491 ae ro di y z b a d r ro di y z b a d r max3488ae max3490ae maxim integrated 17 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
+denotes lead(pb)-free/rohs-compliant package. *ep = exposed paddle. package type package code outline no. land pattern no. 8 soic s8+2 21-0041 90-0096 8 soic s8+4 21-0041 90-0096 14 soic s14+1 21-0041 90-0112 part duplex data rate (max) pin-package package code temperature range max3483aeasa+ half 0.25mbps 8 so s8+2 -40c to +125c max3485aeasa+ half 20mbps 8 so s8+2 -40c to +125c max3488aegsa+ full 0.25mbps 8 so s8+4 -40c to +105c MAX3490AEGSA+ full 20mbps 8 so s8+4 -40c to +105c max3491aeasd+ full 20mbps 14 so s14+1 -40c to +125c package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. chip information process: bicmos ordering information maxim integrated 18 max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers www.maximintegrated.com
revision number revision date description pages changed 0 3/16 initial release revision history ? 2015 maxim integrated products, inc. 19 maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifcations without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max3483ae/max3485ae/ max3488ae/max3490ae/ max3491ae +3.3v-powered, 20kv esd-protected, 20mbps and slew-rate-limited rs-485/rs-422 transceivers for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

▲Up To Search▲

Price & Availability of MAX3490AEGSA

	To Download MAX3490AEGSA Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .