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general description the max4624/max4625 are low-on-resistance, low-voltage single-pole/double-throw (spdt) analog switch- es that operate from a single +1.8v to +5.5v supply. the max4624 has break-before-make switching; the max4625 has make-before-break switching. these devices also have fast switching speeds (t on = 50ns max, t off = 50ns max). when powered from a +5v supply, the max4624/max4625 offer 1 max on-resistance (r on ), with 0.12 max r on matching and flatness. the digital logic inputs are ttl compatible when using a single +5vsupply. these switches also feature overcurrent protec- tion to prevent damage from short circuits and exces- sive loads. the max4624/max4625 are pin compatible with the max4544 and are available in space-saving standard 6-pin sot23 packages, as well as the 1.0mm high thin sot package. applications power routingbattery-operated equipment audio and video signal routing low-voltage data-acquisition systems communications circuits pcmcia cards cellular phones modems hard drives features ? low r on 1 max (+5v supply) 2 max (+3v supply) ? 0.12 max r on flatness (+5v supply) ? overcurrent protection ? +1.8v to +5.5v single-supply operation ? available in sot23 packages ? fast switching: t on = 50ns max, t off = 50ns max ? ttl-logic compatible (+5v supply) ? pin compatible with max4544 ? guaranteed break-before-make (max4624) ? guaranteed make-before-break (max4625) max4624/max4625 1 , low-voltage, single-supply spdt analog switches ________________________________________________________________ maxim integrated products 1 top view 65 4 12 3 nocom nc gnd v+ in max4624/max4625 sot23-6 logic nc 01 on off no off on switches shownfor logic ??input 19-1592; rev 2; 5/01 part max4624 eut-t MAX4624EZT-t -40? to +85? -40? to +85? temp. range pin- package 6 sot23-66 sot23-6* pin configuration/ functional diagram/truth table ordering information top mark aadl aaae max4625 eut-t -40? to +85? 6 sot23-6 aadm max4625ezt-t -40? to +85? 6 sot23-6* aaaf * thin sot (1.0mm height) package. recommended for new designs. for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics?ingle +5v supply(v+ = +5v ?0%, gnd = 0, v inh = 2.4v, v inl = 0.8v, t a = t min to t max , unless otherwise noted.) (notes 2, 3) stresses beyond those listed under ?bsolute 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 specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltages referenced to gnd v+, in ....................................................................-0.3v to +6v com, nc, no (note 1)..............................-0.3v to (v+ + 0.3v) continuous current no, nc to com..............................?00ma peak current no, nc to com (pulsed at 1ms, 10% duty cycle max) ........................ ?00ma continuous power dissipation 6-pin sot23 (derate 7.1mw/? above +70?).............571mw 6-pin thin sot23 (derate 6.25mw/? above +70?) ...500mw operating temperature range max462_e_t ....................................................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? note 1: signals on nc, no, and com exceeding v+ or gnd are clamped by internal diodes. parameter symbol min typ max units analog signal range v com , v no , v nc 0v + v 0.65 1 on-resistance r on v+ = 4.5v, v no or v nc = 3.5v, i com = 100ma t a = +25? 1.2 0.06 0.12 on-resistance match betweenchannels (note 4) ? r on v+ = 4.5v, i com = 100ma, v no or v nc = 3.5v t a = +25? 0.15 0.08 0.12 on-resistance flatness(note 5) r flat(on) v+ = 4.5v; i com = 100ma; v no or v nc = 0, 1v, 2v t a = +25? 0.15 -2 0.01 2 no or nc off-leakagecurrent i no(off) , i nc(off) v+ = 5.5v; v com = 1v, 4.5v; v no or v nc = 4.5v, 1v t a = +25? -20 20 na com on-leakagecurrent v+ = 5.5v; v com = 1v, 4.5v; v no or v nc = 1v, 4.5v, or floating -4 0.3 4 i com(on) t a = +25? -40 40 na overcurrent-protection current threshold 1.2 a t a = +25? 40 50 turn-on time t on v no or v nc = 3v, figure 2 t a = t min to t max 60 ns t a = +25? 40 50 turn-off time t off v no or v nc = 3v, figure 2 t a = t min to t max 60 ns break-before-make delay(note 6) t bbm max4624 only, figure 3a 12 0 ns 16 make-before-break delay(note 6) t mbb max4625 only, figure 3b 1 ns t a = t min to t max t a = t min to t max t a = t min to t max t a = t min to t max conditions 1 dynamic analog switch t a = t min to t max t a = +25? t a = +25? t a = t min to t max t a = +25? t a = t min to t max downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches _______________________________________________________________________________________ 3 parameter symbol min typ max units conditions pc off-isolation (note 7) oirr r l = 50 , c l = 5pf, f = 1mhz, t a = +25?, figure 5 -57 db crosstalk (note 8) r l = 50 , c l = 5pf, f = 1mhz, t a = +25?, figure 5 -57 db nc or no off-capacitance c off f = 1mhz, t a = +25?, figure 6 32 pf com on-capacitance c com(on) f = 1mhz, t a = +25?, figure 6 100 pf input voltage low v inl 0.8 v input voltage high v inh 2.4 v logic input current i in -1 1 ? power-supply range v+ 1.8 5.5 v positive supply current i+ v+ = 5.5v, v in = 0 or v+ 10 ? electrical characteristics?ingle +3v supply(v+ = +2.7v to +3.6v, gnd = 0, v inh = 2.0v, v inl = 0.6v, t a = t min to t max , unless otherwise noted.) (notes 2, 3) v 0v + v com , v no , v nc analog signal range conditions units min typ max symbol parameter ns 65 80 100 v no or v nc = 1.5v, figure 2 t on turn-on time ns 62 80 100 v no or v nc = 1.5v, figure 2 t off turn-off time t a = +25? t a = t min to t max t a = +25? t a = t min to t max ns 14 0 t bbm break-before-make timedelay (note 4) ns 18 t mbb make-before-break timedelay (note 4) pc 40 q charge injection electrical characteristics?ingle +5v supply (continued)(v+ = +5v ?0%, gnd = 0, v inh = 2.4v, v inl = 0.8v, t a = t min to t max , unless otherwise noted.) (notes 2, 3) charge injection c l = 1.0nf, v gen = 0, r gen = 0, t a = +25?, figure 4 q 65 2.5 1.2 2.0 v+ = 2.7v,v no or v nc = 1.5v, i com = 100ma r on on-resistance t a = +25? t a = t min to t max max4624 only, figure 3a max4625 only, figure 3b c l = 1.0nf, figure 4, v gen = 0, r gen = 0, t a = +25? supply logic input 0.25 v+ = 2.7v; i com = 100ma; v no or v nc = 0, 0.75v, 1.5v; t a = +25? r flat(on) on-resistance flatness (note 6) analog switch dynamic downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches 4 _______________________________________________________________________________________ electrical characteristics?ingle +3v supply (continued)(v+ = +2.7v to +3.6v, gnd = 0, v inh = 2.0v, v inl = 0.6v, t a = t min to t max , unless otherwise noted.) (notes 2, 3) note 2: the algebraic convention, where the most negative value is a minimum and the most positive value is a maximum, is used inthis data sheet. note 3: sot-packaged parts are 100% tested at +25?. limits across the full temperature range are guaranteed by design and correlation. note 4: ? r on = r on(max) - r on(min) . note 5: flatness is defined as the difference between the maximum and minimum values of on-resistance as measured over thespecified analog signal range. note 6: guaranteed by design. note 7: off-isolation = 20log 10 [v com / (v nc or v no )], v com = output, v nc or v no = input to off switch. note 8: between the two switches. v 2.0 v inh input voltage high v 0.6 v inl input voltage low conditions units min typ max symbol parameter ? 10 v+ = 3.6v, v in = 0 or v+ i+ positive supply current ? -1 1 i in logic input current logic input supply __________________________________________typical operating characteristics (t a = +25?, unless otherwise noted.) 0 1 2 3 4 5 6 012345 on-resistance vs. com voltage over supply voltage max4624 toc01 v com (v) r on ( ) v com = 100ma +2.0v +2.3v +2.5v +3.0v +5v +1.8v 1.000.75 0.50 0.25 0 02 1 345 on-resistance vs. com voltage over temperature max4624 toc02 v com (v) r on ( ) t a = +85 ? t a = +105? t a = +25? t a = -40? t a = -55? v+ = 5vi com = 100ma 0 40 t on t off 20 8060 100 120 24 35 6 turn-on/off times vs. supply voltage max4624 toc03 v supply (v) t on /t off (ns) downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches _______________________________________________________________________________________ 5 0 10 3020 40 50 -40 0 -20 20406080 turn-on/off times vs. temperature max4624toc4 temperature ( c) t on /t off (ns) t on v+ = 5vv no or v nc = 3v t off 0.01 0.001 0.1 1 10 -40 0 -20 20406080100 on/off-leakage current vs. temperature max4624toc5 temperature ( c) on/off-leakage (na) -200 -100-150 0 -50 50 100 02 1 345 charge injection vs. com voltage max4624 toc06 v com (v) q (pc) max4625 max4624 0 -90 30k 100k 1m 10m 100m frequency response -80 max4624 toc07 frequency (hz) loss (db) phase (degrees) -30-40 -50 -60 -70 -20 -10 10-80 -70 -20-30 -40 -50 -60 -10 -0 v+ = 5v50 = in/out off-isolation on-loss on-phase 0 0.5 1.51.0 2.0 2.5 logic threshold voltage vs. supply voltage max4624 toc08 supply voltage (v) logic threshold voltage (v) 24 35 6 vin rising vin falling 0.1 0.001 10 100 1k 10k 100k total harmonic distortion vs. frequency max4624 toc09 frquency (hz) thd (%) 0.01 0 1.5a 0 3.3v max4624 toc10 1ms/div overcurrent response v com 2v/divi com 1a/div _____________________________typical operating characteristics (continued) (t a = +25?, unless otherwise noted.) downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches 6 _______________________________________________________________________________________ pin description detailed description the max4624/max4625 are low-on-resistance (r on ), low-voltage, single-pole/double-throw (spdt) analogswitches that operate from a +1.8v to +5.5v supply. the max4624 has break-before-make switching, and the max4625 has make-before-break switching. these devices also have fast switching speeds (t on = 50ns max, t off = 50ns max). when powered from a +5v supply, their 1 max r on allows high continuous currents to be switched in avariety of applications. in an overcurrent condition, these switches provide both current-limit and thermal- shutdown protection. current-limit protection the max4624/max4625 feature current-limit protectioncircuitry. when the voltage drop across the on switch reaches 0.6v typ, the internal circuitry activates. the current limit is not instantaneous, but rather integrates over time, so current limiting will not activate when theswitch output charges a small 0.1? capacitor. for sus- tained overload conditions, the switch turns off (opens). the switch turns on after 5ms. if the overload persists, the switch cycles off and on to produce a pulsed out- put. a direct short circuit will be detected immediately, and the switch will pulse on for 1?, then remain off for 5ms. applications information logic inputs the max4624/max4625 logic inputs can be driven upto +5.5v regardless of the supply voltage. for example, with a +3.3v supply, in may be driven low to 0v and high to 5.5v. driving in rail-to-rail minimizes power consumption. analog signal levels analog signals that range over the entire supply voltage(v+ to gnd) can be passed with very little change in on-resistance (see typical operating characteristics ). the switches are bidirectional, so the no, nc, andcom pins can be used as either inputs or outputs. power-supply sequencing and overvoltage protection caution: do not exceed the absolute maximum rat-ings because stresses beyond the listed ratings may cause permanent damage to the devices. proper power-supply sequencing is recommended for all cmos devices. always apply v+ before applying analog signals, especially if the analog signal is not current limited. if this sequencing is not possible, and if the analog inputs are not current limited to <20ma, add analog switch?ommon com 5 analog switch?ormally open no 6 analog switch?ormally closed nc 4 ground gnd 3 pin positive supply voltage input v+ 2 digital control input in 1 function name positive supply com no d2 d1 gnd v g v+ max4624max4625 figure 1. overvoltage protection using two external blockingdiodes rail-to-rail is a registered trademark of nippon motorola, ltd. downloaded from: http:///
a small-signal diode (d1) as shown in figure 1. if theanalog signal can dip below gnd, add d2. adding protection diodes reduces the analog range to a diode drop (about 0.7v) below v+ (for d1), and a diode drop above ground (for d2). on-resistance increases slightly at low supply voltages. maximum supply voltage (v+) must not exceed +6v. adding protection diode d2 causes the logic threshold to be shifted relative to gnd. ttl compatibility is not guaranteed when d2 is added. protection diodes d1 and d2 also protect against someovervoltage situations. with figure 1? circuit, if the sup- ply voltage is below the absolute maximum rating, and if a fault voltage up to the absolute maximum rating is applied to an analog signal pin, no damage will result. max4624/max4625 1 , low-voltage, single-supply spdt analog switches _______________________________________________________________________________________ 7 t r < 5ns t f < 5ns 50% v inl logic input r l 50 com gnd in c l includes fixture and stray capacitance. v out = v n_ ( r l ) r l + r on v in_ v inh t off 0v no or nc 0.9 v 0ut 0.9 v out t on v out switch output logic input logic input waveforms inverted for switchesthat have the opposite logic sense. v+ c l 35pf v+ v out max4624max4625 figure 2. switching time test circuits/timing diagrams 50% v inh v inl logic input v out 0.9 v out t d logic input r l 50 gnd c l includes fixture and stray capacitance. noin nc v out v+ v+ c l 35pf v n_ com max4624 figure 3a. break-before-make interval (max4624 only) downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches 8 _______________________________________________________________________________________ logic input 0.8 v out 0.8 ? v out v inh v inl v nc v nc v no v nq t mbb logic input r l 50 r l 50 gnd c l includes fixture and stray capacitance. no nc v com v+ v+ c l 35pf c l 35pf max4625 figure 3b. make-before-break interval (max4625 only) v gen gnd com c l v out v+ v out in off on off ? v out q = ( ? v out )(c l ) nc or no in depends on switch configuration;input polarity determined by sense of switch. off on off in v inl to v inh v+ r gen in max4624max4625 figure 4. charge injection measurements are standardized against shorts at ic terminals. off-isolation is measured between com_ and "off" no_ or nc_ terminal on each switch. on-loss is measured between com_ and "on" no_ or nc_terminal on each switch. crosstalk is measured from one channel to all other channels. signal direction through switch is reversed; worst values are recorded. +5v v out v+ innc com no v in max4624max4625 off-isolation = 20log v out v in on-loss = 20log v out v in crosstalk = 20log v out v in network analyzer 50 50 50 50 meas ref 10nf 0v or v+ 50 gnd figure 5. on-loss, off-isolation, and crosstalk test circuits/timing diagrams (continued) downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches _______________________________________________________________________________________ 9 capacitance meter nc or no com gnd in v inl or v inh 10nf v+ f = 1mhz v+ max4624max4625 figure 6. channel off/on-capacitance transistor count: 186 chip information downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches 10 ______________________________________________________________________________________ 6lsot.eps package information downloaded from: http:///
max4624/max4625 1 , low-voltage, single-supply spdt analog switches package information (continued) 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. downloaded from: http:///

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