general description the max4644 is a single-pole/double-throw (spdt) switch that operates from a single supply ranging from +1.8v to +5.5v. it provides low 4 on-resistance (r on ) as well as 1 r on flatness over the entire analog-signal range. the max4644 offers fast switching times of less than 20ns while ensuring break-before-make operation. it typically consumes only 0.01w of quiescent power, making it suitable for use in low-power, portable appli- cations. the max4644s features include low leakage currents over the entire temperature range, ttl/cmos-compati- ble digital logic, and excellent ac characteristics. it is packaged in either a small 8-pin max ? or a tiny 6-pin sot23. applications battery-operated equipment audio and video signal routing low-voltage data-acquisition systems sample-and-hold circuits communications circuits features ? +1.8v to +5.5v single-supply operation ? rail-to-rail analog-signal range ? guaranteed r on 4 max (+5v supply) 8 max (+3v supply) ? +1.8v operation r on 30 (typ) over temperature t on 18ns (typ), t off 12ns typ ? guaranteed r on flatness: 0.75 (typ) (+5v supply) ? guaranteed r on match between channels: 0.1 typ (+5v supply) ? low leakage (< 0.35na) over entire temperature range ? excellent ac characteristics low crosstalk: -82db at 1mhz high off-isolation: -80db at 1mhz 0.018% total harmonic distortion ? low power consumption: < 0.01 w max4644 high-speed, low-voltage, 4 , spdt cmos analog switch ________________________________________________________________ maxim integrated products 1 nc gnd 1 2 6 5 no com v+ in 3 4 max4644 sot23-6 max4644 in gnd n.c. v+ 1 2 8 7 no n.c. nc com 3 4 6 5 max top view in 0 1 nc no max4644 off on on off pin configurations/functional diagrams/truth table 19-1657; rev 1; 1/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. ordering information + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. part temp. range pin- package top mark max4644eut+t -40c to +85c 6 sot23 aahq max4644eua+t -40c to +85c 8 max ? max is a registered trademark of maxim integrated products, inc.
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch 2 _______________________________________________________________________________________ electrical characteristicssingle +5v supply (v+ = +4.5v to +5.5v, v inh = 2.4v, v inl = 0.8v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) stresses beyond those listed under absolute 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. (all voltages referenced to gnd.) v+ .............................................................................-0.3v to +6v in, com, no, nc (note 1) ...........................-0.3v to (v+ + 0.3v) continuous current (any terminal)....................................20ma continuous current (no, nc, and com) .........................50ma peak current (no, nc, and com, pulsed at 1ms, 10% duty cycle)......................................................... 100ma continuous power dissipation (t a = +70c) 6-pin sot23 (derate 8.70mw/c above +70c)........ 696mw 8-pin max (derate 4.5mw/c above +70c) ........... 362mw operating temperature range ...........................-40c to +85c junction temperature ......................................................+150c storage temperature range .............................-65c to +150c lead temperature (soldering, 10s) ................................ +300c soldering temperature (reflow) ...................................... +260c v+ = 4.5v, i com = 10ma, v no or v nc = 0 to v+ v in = 0.8v or 2.4v v+ = 5.5v, v com = 1v or 4.5v v+ = 4.5v, i com = 10ma, v no or v nc = 0 to v+ v+ = 4.5v, i com = 10ma, v no or v nc = 0 to v+ conditions a -0.1 0.005 0.1 i in input current v 0.8 v il input-logic low v 2.4 v ih input-logic high 2.5 4 r on on-resistance v 0v+ v com , v no , v nc analog-signal range digital inputs -0.35 0.35 i com(on) na -0.25 0.01 0.25 com on-leakage current (notes 4, 5) 1.2 4.75 0.1 r on on-resistance match between channels (note 2) 0.4 0.75 1 r flat on-resistance flatness (note 3) units min typ max symbol parameter note 1: signals on no, nc, com, or in exceeding v+ or gnd are clamped by internal diodes. limit forward-diode current to maximum current rating. t a = +25c t a = t min to t max t a = +25c t a = t min to t max t a = +25c t a = t min to t max t a = +25c v+ = 5.5v, v com = 1v or 4.5v, v no or v nc = 4.5v or 1v -0.35 0.35 t a = t min to t max na -0.25 0.01 0.25 i no(off) , i nc(off) no, nc off-leakage current (note 4) t a = +25c v+ = 5.5v, v com = 1v or 4.5v, v no or v nc = 4.5v or 1v -0.35 0.35 t a = t min to t max na -0.25 0.01 0.25 i com(off) com off-leakage current (note 4) t a = +25c t a = t min to t max analog switch digital inputs absolute maximum ratings
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch _______________________________________________________________________________________ 3 electrical characteristics single +5v supply (continued) (v+ = +4.5v to +5.5v, v inh = 2.4v, v inl = 0.8v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) electrical characteristicssingle +3v supply (v+ = +2.7v to +3.3v, v inh = 2.0v, v inl = 0.4v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) r l = 300 ; c l = 35pf; v no , v nc = 3v; figure 2 r l = 600 , 0.5vp-p, f = 20hz to 20khz c l = 5pf, r l = 50 , figure 3 f = 1mhz, figure 5 t a = +25c r l = 300 ; c l = 35pf; v no , v nc = 3v; figure 2 t a = +25c no or nc = gnd, f = 1mhz, figure 5 r l = 300 ; c l = 35pf; v no or v nc = +3v; figure 2 v gen = 0v, r gen = 0v, c l = 1nf, figure 4 conditions % 0.018 thd total harmonic distortion db -80 v iso off-isolation (note 6) pf 34 c (on) switch on-capacitance pf 12 c no(off), c nc(off) no, nc off-capacitance pc 5 q charge injection ns 11 15 t on turn-on time (note 4) 1 t a = t min to t max 18 t a = +25c t a = t min to t max ns 35 t off turn-off time (note 4) 6 t a = t min to t max ns 8 t bbm break-before-make (note 4) units min typ max symbol parameter v+ = 5.5v, v in = 0v or v+ a 0.001 1.0 i+ positive supply current f = 1mhz f = 10mhz c l = 5pf, r l = 50 , figure 3 f = 1mhz f = 10mhz db -82 v ct crosstalk (note 7) -55 -62 v+ = 2.7v, i com = 10ma, v no or v nc = 0 to v+ t a = +25c v+ = 2.7v, i com = 10ma, v no or v nc = 0 to v+ v+ = 2.7v, i com = 10ma, v no or v nc = 0 to v+ conditions 68 r on on-resistance v 0v+ v com , v no , v nc analog-signal range t a = t min to t max 9 t a = +25c t a = t min to t max 0.1 r on on-resistance match between channels (note 2) 0.4 t a = +25c 1.5 3 r flat on-resistance flatness (note 3) units min typ max symbol parameter dynamic supply t a = t min to t max 3.5 analog switch
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch 4 _______________________________________________________________________________________ electrical characteristicssingle +3v supply (continued) (v+ = +2.7v to +3.3v, v inh = 2.0v, v inl = 0.4v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) note 2: r on = r on(max) - r on(min) . note 3: r on flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog-signal range. note 4: guaranteed by design. note 5: on-leakage performed with voltage applied to com, with no and nc left unconnected. note 6: off-isolation = 20log 10 (v o / v i ), where v o is v com and v i is either v nc or v no from the network analyzer. note 7: crosstalk is measured between the two switches. no or nc = gnd, f = 1mhz, figure 5 c l = 5pf, r l = 50 , figure 3 v gen = 0v, r gen = 0v, c l = 1nf, figure 4 v in = 0.4v or 2.0v r l = 300 ; c l = 35pf; v no , v nc = 2v; figure 2 c l = 5pf, r l = 50 , figure 3 r l = 300 ; c l = 35pf; v no , v nc = 2v; figure 2 conditions db -62 -80 v iso off-isolation (note 6) db -55 v 0.4 v il input-logic low v 2.0 v ih input-logic high pf 12 c no(off) , c nc(off) no, nc off-capacitance pc 5 q charge injection a -0.1 0.005 0.1 i in input current ns 22 t on turn-on time (note 4) ns 8 t bbm units min typ max symbol parameter 14 20 t a = t min to t max t a = +25c r l = 300 ; c l = 35pf; v no , v nc = 2v; figure 2 ns 8 t off turn-off time (note 4) 4 7.5 t a = t min to t max t a = +25c break-before-make (note 4) t a = +25c t a = t min to t max 1 f = 1mhz, figure 5 pf 34 c (on) switch on-capacitance -82 v ct crosstalk (note 7) f = 10mhz f = 1mhz f = 10mhz f = 1mhz v+ = 3.3v, v in = 0v or v+ a 0.001 1.0 i+ positive supply current digital inputs dynamic supply
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch _______________________________________________________________________________________ 5 140 120 100 80 60 40 20 0 02 1 345 charge injection vs. v com max4644-04 v com (v) charge injection (pc) v+ = 5v i com = 10ma 20 15 10 5 0 02 1 345 on-resistance vs. v com max4644-01 v com (v) r on ( ) v+ = 3v v+ = 2.5v v+ = 5v v+ = 1.8v r on ( ) 5 4 3 2 1 -40 10 -15 35 60 85 on-resistance vs. temperature max4644-02 temperature (c) v+ = 3v v+ = 5v i com = 10ma 1 -40 85 35 60 -15 10 on-/off-leakage current vs. temperature 1000 10 100 max4644-03 temperature (c) leakage (pa) off-leakage on-leakage 0 40 20 80 60 120 100 140 supply current vs. supply voltage max4644-05 supply voltage (v) supply current (na) 1.8 2.8 3.8 4.8 5.8 in = gnd in = v+ 300 250 200 150 100 50 0 -40 10 -15 35 60 85 supply current vs. temperature max4644-06 temperature (c) supply current (na) in = gnd v+ = 5v v+ = 3v v+ = 1.8v 2.0 1.5 1.0 0.5 0 1.8 3.4 2.6 4.2 5.0 5.8 logic threshold vs. supply voltage max4644-07 supply voltage (v) logic threshold (v) 0 3 9 6 12 15 switching times vs. supply voltage max4644-08 supply voltage (v) switching times (ns) 24 35 t off t on 0 2 6 4 8 10 switching times vs. temperature max4644-09 temperature ( c) switching times (ns) -40 35 60 10 -15 85 v+ = 5v t off t on typical operating characteristics (v+ = +5v or +3v, v inh = v+, inl = gnd, t a = +25c, unless otherwise noted.)
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v+ = +5v or +3v, v inh = v+, inl = gnd, t a = +25c, unless otherwise noted.) pin description 0 0.01 0.1 1 10 100 1000 -10 -40 -50 -30 -20 -60 -70 -80 -90 frequency response max4644-10 frequency (mhz) (db/div) off-isolation on-loss v+ = 5v 0.05 0.01 1 10 0.1 100 total harmonic distortion vs. frequency max4644-11 frequency (khz) thd (%) 0 0.01 0.02 0.03 0.04 v+ = 5v note: the switches are bidirectional, which means that a signal can be passed through either side of the on switch. however, the typical off-capacitances differ as shown in the electrical characteristics. in logic-controlled input v+ positive supply voltage input. bypass with a 0.1f capacitor to gnd. gnd ground no analog-switch normally open terminal com analog-switch common terminal nc analog-switch normally closed terminal n.c. no connection. not internally connected. 6 4 3 8 1 2 5, 7 1 2 3 6 5 4 max sot23 max4644 function name
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch _______________________________________________________________________________________ 7 applications information the max4644 operates from a single supply ranging from +1.8v to +5.5v. the device is guaranteed to be functional over that supply range, but ttl/cmos com- patibility is only valid for operation using a +5v supply. all voltage levels are referenced to gnd. positive and negative dc analog inputs or ac signals can be accommodated by shifting v+ and gnd. esd-protection diodes are internally connected between each analog-signal pin and both v+ and gnd. one of these diodes conducts if any analog signal exceeds v+ or gnd (figure 1). virtually all of the ana- log leakage current comes from the esd diodes to v+ or gnd. although the esd diodes on a given signal pin are identical, and therefore fairly well balanced, they are reverse biased differently. each is biased by either v+ or gnd and the analog signal. this means their leakages will vary as the signal varies. the difference in the two diode leakages to the v+ and gnd pins consti- tutes the analog-signal-path leakage current. all analog leakage current flows between each pin and one of the supply terminals, not to the other switch terminal. this is why both sides of a given switch can show leakage cur- rents of the same or opposite polarity. there is no normal current path between the analog- signal paths and v+ or gnd. v+ and gnd also power the internal logic and logic-level translators. the logic- level translators convert the logic level into switched v+ and gnd signals to drive the analog signal gates. chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.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. v+ n0, nc gnd com figure 1. overvoltage protection using external blocking diodes package type package code outline no. land pattern no. 6 sot23 u6+4 21-0058 90-0175 8 max u8+1 21-0036 90-0092
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch 8 _______________________________________________________________________________________ v+ v com gnd v+ in no com v no v nc max4644 35pf nc open open v+ gnd v+ in in no com com 300 max4644 v com 300 35pf v com 300 35pf 50 v in 50 v in 50 v in nc v+ v+ v s max4644 v s v no v nc v ih + 0.5v in 50% 50% v no v com 0 0 v nc v com v com t off t on v ih + 0.5v 0 in 50% 50% t on t off 50% 50% v ih + 0.5v in 0 or t bbm = t on(nc) - t off(no) t bbm = t on(no) - t off(nc) v s 0 90% t bbm t bbm 90% 90% 90% 90% 90% t r < 5ns t f < 5ns 0 gnd figure 2. switching times
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch _______________________________________________________________________________________ 9 figure 5. no, nc, and com capacitance measurements are standardized against short at socket terminals. off-isolation is measured between com and off terminal on each switch. on-loss is measured between com and on terminal on each switch. signal direction through switch is reversed; worst values are recorded. v+ v+ v out gnd v+ in no or nc com v in max4644 off-isolation = 20log v out v in on-loss = 20log v out v in network analyzer 50 50 50 50 meas ref 0.1 f 50 figure 3. off-isolation and on-loss v out v+ 0 v in v out v out is the measured voltage due to charge transfer error q when the channel turns off. q = v out x c l v+ v out gnd v+ in no or nc com v no or v nc = 0v 50 max4644 c l 1000pf v in v+ gnd v+ in no or nc com max4644 as required 1mhz capacitance analyzer figure 4. charge injection
max4644 high-speed, low-voltage, 4 , spdt cmos analog switch 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. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/00 initial release 1 1/11 added lead-free parts to the ordering information table 1
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