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for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 _______________general description the max335 analog switch with serial digital interface offers eight separately controlled single-pole-single- throw (spst) switches. all switches conduct equally in either direction, and on-resistance (100 w ) is constant over the analog signal range. these cmos switches can operate continuously with power supplies ranging from 4.5v to 20v and handle rail-to-rail analog signals. upon power-up, all switches are off, and the internal serial and parallel shift registers are reset to zero. the max335 is equivalent to two dg211 quad switches but controlled by a serial interface. the interface is compatible with the motorola spi inter- face standard. functioning as a shift register, this serial interface allows data (at din) to be locked in synchro- nous with the rising edge of clock (sclk). the shift reg- ister's output (dout) enables several max335s to be daisy chained. ________________________applications serial data acquisition and process control avionics signal routing networking ____________________________featur es ? 8 separately controlled spst switches ? spi-compatible serial interface ? accepts 15v analog swings ? multiple devices can be daisy chained ______________or dering infor mation max335 serial contr olled, 8-channel spst switch ________________________________________________________________ maxim integrated products 1 sclk v+ din gnd no0 com0 no1 com1 no2 com2 no3 com3 dip/so top view max335 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 cs vl dout v- no7 com7 no6 com6 no5 com5 no4 com4 __________________pin configuration 19-0220; rev 3 ; 10/03 latch no0 com0 8-bit shift register clock translator cs translator +5v translator d in v l sclk cs no7 com7 parallel register and translator dout max335 * contact factory for dice specifications. ** contact factory for availability and processing to mil-std-883. part temp range pin-package max335cng 0? to +70? 24 narrow plastic dip max335cwg 0? to +70? 24 wide so max335c/d 0? to +70? dice* max335eng -40? to +85? 24 narrow plastic dip max335eug -40? to +85? 24 tssop max335ewg -40? to +85? 24 wide so max335mrg -55? to +125? 24 narrow cerdip**
max335 serial controlled, 8-channel spst switch 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v l = +5v ?0%, v+ = 15v, v- = -15v, 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 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 absolute maximum rating conditions for extended periods may affect device reliability. parameter symbol min typ max units -1 0.002 1 -20 20 -1 0.002 1 on-resistance r on 200 no off-leakage current i no(off) -20 20 na -1 0.002 1 -20 20 -1 0.002 1 analog signal range v analog -15 15 v 100 150 com off-leakage current i com(off) -20 20 na -2 0.01 2 -40 40 -2 0.01 2 com on-leakage current i com(on) -40 40 na 2.4 din, sclk, cs input logic threshold high v ih 11 v 0.8 din, sclk, cs input logic threshold low v il 3 v -1 0.03 1 din, sclk, cs input current logic high -1 0.03 1 ? i inh conditions v com = -14v, v no = +14v v com = -14v, v no = +14v v com = ?0v, i no = 1ma v com = -14v, v no = +14v v com = v no = +14v v com = -14v, v no = +14v v com = v no = -14v t a = t min to t max v din , v sclk , v cs = 2.4v v l = +15v, v din , v sclk , v c s = 11v t a = +25? t a = +25? din, sclk, cs input current logic low i inl v din , v sclk , v cs = 0.8v -1 0.03 1 ? dout output voltage logic high v dout i dout = 0.8ma 3.5 v l v t a = +25? t a = +25? t a = +25? t a = +25? v l = +5v v l = +15v v l = +5v v l = +15v v l = +15v, v din , v sclk , v c s = 3v -1 0.03 1 switch digital i/o t a = +25? note 1: all leads are soldered or welded to pc boards. voltages referenced to v- v+...........................................................................................44v gnd .......................................................................................25v v l .....................................................(gnd - 0.3v) to (v+ + 0.3v) sclk, cs , din, dout, no_, com_ ...............v- -2v to v+ +2v or 30ma, whichever occurs first continuous current (any terminal) .......................................30ma peak current, no or com (pulsed at 1ms, 10% duty cycle max) ...............................00ma continuous power dissipation (t a = +70?) (note 1) narrow plastic dip (derate 13.33mw/? above +70?)1067mw wide so (derate 11.76mw/? above +70?) .................941mw narrow cerdip (derate 12.50mw/? above +70?) .....1000mw tssop (derate 12.2mw/? above +70?)...........................30ma operating temperature ranges max335c_ _ ............................................................0? to +70? max335e_ _ .........................................................-40? to +85? max335mrg.......................................................-55? to +125? storage temperature range ..............................-65? to +160? lead temperature (soldering, 10sec)...............................+300?
max335 serial controlled, 8-channel spst switch _______________________________________________________________________________________ 3 electrical characteristics (continued) (v l = +5v 10%, v+ = 15v, v- = -15v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?c.) note 2: when v l falls below this voltage, all switches are set off and the internal shift register is cleared (all zero). note 3: guaranteed, not production tested. parameter com off-capacitance symbol min typ max c com(off) 2 units pf 200 400 channel on-capacitance c com(on) 8 sclk input hysteresis sclk hyst 100 pf mv v l reset voltage v ll 0.8 v turn-on time t on 500 ns 90 400 off isolation turn-off time oirr t off 500 90 ns no off-capacitance db c no(off) 2 pf channel-to-channel crosstalk ccrr 100 db break-before-make delay t bbm 25 15 clock feedthrough at s, d (note 3) esclk 100 nv-sec dout output voltage logic low v dout 0.4 v power-supply voltage range v+/v- 4.5 20 v v l 4.5 v+ v conditions v d = gnd, f = 1mhz v d = v s = gnd, f = 1mhz (note 2) from rising edge of cs r l = 100 ? , c l = 15pf, v s = 1v rms , f = 100khz from rising edge of cs v s = gnd, f = 1mhz r l = 50 ? , c l = 15pf, v s = 1v rms , f = 100khz d load = s load = 75 ? , measured at s and d i dout = -1.6ma 150 300 v+ supply current i+ din = cs = sclk = 0v/5v 500 a 0.01 10 v- supply current i- din = cs = sclk = 0v/5v 10 a 50 100 v l power-supply voltage range v l supply current i l din = cs = sclk = 0v/5v 200 a t a = +25?c t a = +25?c t a = +25?c t a = +25?c t a = +25?c ns t a = +25?c t a = +25?c t a = +25?c t a = +25?c t a = +25?c t a = +25?c t a = +25?c v l reset voltage v lh 2.4 v digital i/o switch dynamic characteristics power supplies t a = +25?c
max335 serial controlled, 8-channel spst switch 4 _______________________________________________________________________________________ parameter dout data-hold time after rising sclk (note 4) symbol min typ max 0 units data-setup time t ds ns 200 rise time of dout (note 3) ns sclk low time 100 t cl 190 ns sclk high time t ch 190 ns ns cs lag time t csh2 240 ns data-hold time t dh 0 ns dout data valid after falling sclk t do 240 2 ns s fall time of dout (note 3) 100 ns cycle time sclk maximum frequency 2 f sclk 2.1 s mhz t ch + t cl 480 ns cs lead time t css 240 ns conditions c l = 10pf 20% v l to 70% v l , c l = 10pf 20% v l to 70% v l , c l = 10pf 70% v l to 20% v l , c l = 10pf 70% v l to 20% v l , c l = 10pf note 4: this specification guarantees that data at d out never appears before sclk's falling edge. timing characteristics of serial digital interface (figure 1) (v l = +5v ?0%, v+ = +15v, v- = -15v, t a = t min to t max , unless otherwise noted.) 400 t a = +25? allowable fall time at din, sclk, cs (note 3) allowable rise time at din, sclk, cs (note 3) 50% of sclk to 10% of dout cl = 10pf
max335 serial controlled, 8-channel spst switch _______________________________________________________________________________________ 5 300 0 -20 20 r on vs. v com and power-supply voltage 50 250 max335-01 v com (v) r on ( w ) 10 150 100 -10 0 200 a: ?v b: ?0v c: ?5v d: ?0v a b c d 300 0 -20 20 r on vs. v com and temperature 50 250 max335-02 v com (v) r on ( w ) 10 150 100 -10 0 200 a: t a = +25? b: t a = +85? c: t a = +125? c b a 600 0 020 t on , t off vs. v com 100 500 max335-03 v com (v) t on , t off (ns) 15 300 200 510 400 t on t off 60 -60 ?0 data-hold time vs. power-supply voltage -40 40 max335-04 supply voltage (v) data-hold time (ns) ?5 0 -20 ? ?0 20 105 -105 charge injection vs. v com -70 70 max335-07 v com (v) q (pc) 20 0 -35 -20 0 35 -15 -10 -5 5 10 15 a: ?v b: ?5v a b 60 0 ?0 data-setup time vs. power supply 10 50 max335-05 supply voltage (v) data-setup time (ns) ?5 30 20 ? ?0 40 200 0.0002 leakage current vs. temperature 0.002 20 max335-06 temperature ( c) on-leakage (pa) +125 0.2 0.02 -55 +25 2 on off 1000 0.001 supply vs. temperature 0.01 100 max335-08 temperature ( c) i+, i-, i l ( m a) +125 1 0.1 -55 +25 10 i+ i l i- 60 0 minimum sclk pulse width vs. power supply 10 50 max335-09 supply voltage (v) sclk (ns) ?0 30 20 ? ?0 40 ?5 __________________________________________typical operating characteristics (v+ = +15v, v- = -15v, v l = 5v, t a = +25?, unless otherwise noted.)
______________detailed description serial digital interface basic operation refer to figure 2. the max335 interface can be thought of as an 8-bit shift register controlled by cs. while cs is low, input data appearing at din is clocked into the shift register synchronous with sclk?s rising edge. the data is an 8-bit word, each bit controlling one of eight switches in the max335 (table 1). dout is the output of the shift register, with data appearing syn- chronous with sclk?s 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 original configuration. when the 8 bits of data have been shifted in, cs is brought high. this updates the new switch configuration and inhibits fur- ther data from entering the shift register. transitions at din and sclk have no effect when cs is high, and dout holds the last bit in the shift register. the max335 three-wire serial interface is compatible with the spia and microwirea standards. if interfacing with a motorola processor serial interface, set cpol = 0. the max335 is considered a slave device (figures 2 and 3). upon power-up, the shift register contains all zeros, and all switches are off. the latch that drives the analog switch is only updated on the rising edge of cs when sclk is low. if sclk is high when cs rises, the latch will not be updated until sclk goes low. the cpol = 1, cpha = 1 spi configuration does not update the latch correctly. daisy chaining for a simple interface using several max335s, daisy chain the shift registers as shown in figure 5. the cs pins of all devices are connected together, and a stream of data is shifted through the max335s in series. when cs is brought high, all switches are updated simultaneously. additional shift registers may be included anywhere in series with the max335 data chain. addressable serial interface when several serial devices are configured as slaves, addressable by the processor, din pins of each max335 are connected together (figure 6). address decode logic individually controls cs of each slave device. when a slave is selected, its cs is brought low, data is shifted in, and cs is brought high to latch the data. typically, only one slave is addressed at a time. dout is not used. digital feedthrough digital feedthrough energy measures 100nv-sec, which means that with no filtering at the signal channel, feedthrough from a sharply rising clock edge into an unfiltered switch channel can be measured at 1vp-p for 100ns. however, even 100pf capacitance in the switch channel, when combined with the switch resistance, yields a filter that reduces this transient to 10mvp-p typical. to reduce digital feedthrough, hysteresis (150mv typ) was added to the sclk input so triangle or sine waves may be used. max335 serial controlled, 8-channel spst switch 6 _______________________________________________________________________________________ name function 1 sclk serial clock input 2 v+ positive supply voltage pin _____________________pin description 3 din serial data input 4 gnd ground 8 com1 switch 1 7 no1 switch 1 6 com switch 0 5 no switch 0 13 com4 switch 4 12 com3 switch 3 11 no3 switch 3 10 com2 switch 2 9 no2 switch 2 14 no4 switch 4 15 com5 switch 5 16 no5 switch 5 17 com6 switch 6 18 no6 switch 6 19 com7 switch 7 20 no7 switch 7 21 v- negative supply voltage 22 dout serial data output 23 v l logic supply/reset 24 c s chip select
max335 serial controlled, 8-channel spst switch _______________________________________________________________________________________ 7 sclk din dout cs t do t dh t ds t csh0 t css t ch t cl t csh1 t csh2 t cll t off figure 1. timing diagram 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. three-wire interface timing
max335 serial controlled, 8-channel spst switch 8 _______________________________________________________________________________________ x d6 d5 0 x x 1 x x 0 x x d7 1 x x x x x x x x x 1 x x 0 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 x x d3 x x x x x x x x x x x 1 0 d4 x x x x 1 0 x x x x x x x d2 x x x x x x x x x 1 0 x x switch 7 open (off) switch 7 closed (on) switch 6 open switch 6 closed switch 4 closed switch 4 open switch 5 closed switch 5 open switch 1 open switch 2 closed switch 2 open switch 3 closed switch 3 open d1 x x x x x x x x 0 x x x x x x x x x x 1 x switch 1 closed x x x x x x x 0 switch 0 open x x x x x x x 1 switch 0 closed table 1. serial-interface switch programming x = don't care sclk din dout cs sk so si i/0 microwire port max335 the dout-si connection is not required for writing to the max335, but may be used for data-echo purposes. dout din sclk cs miso mosi sck i/0 spi port max335 the dout-miso connection is not required for writing to the max335, but may be used for data-echo purposes. cpol = 0, cpha = 0 figure 3. connections for microwire figure 4. connections for spi data bits function
max335 serial controlled, 8-channel spst switch _______________________________________________________________________________________ 9 sclk din cs max335 sclk din cs max335 sclk din cs max335 dout dout dout sclk din cs to other serial devices figure 5. daisy-chained connection cs sclk din max335 cs sclk din max335 cs sclk din max335 to other serial devices din sclk cs1 cs2 cs3 figure 6. addressable serial interface
max335 __________applications information 8 x 1 multiplexer to use the max335 as an 8 x 1 multiplexer, tie all drains together (com0 to com7); the mux inputs now source each switch (no0 to no7). input a single 0v to +3v pulse at din. as this is clocked through the regis- ter by sclk, each switch will sequence on one at a time. 4-2 differential multiplexer to use the max335 as a 4-2 differential multiplexer, tie com0 through com3 together and com4 through com7 together. differential inputs will be the source inputs as follows: (no0, no4), (no1, no5), (no2, no6), (no3, no7). figure 7 shows the serial input con- trol at din required to turn on two switches making a differential multiplexer. cs is held low for four clock pulses; the first pulse is clocked into the fifth switch position as the second pulse is clocked into the first switch position. cs is pulled high to update switches; then cs is pulled low, and sclk advances pulses to s1 and s5 positions, where cs is pulled high to update, etc. spdt switches tie com0 to no1 so that no0 and com1 are now inputs and com0/no1 is the common output. sp is common output. up to four spdt switches can be made from each max335. multiples of four or more can be made by daisy chaining devices. in figure 8, din is a pulse train. again, cs is held low to clock in pulses and cs is pulled high to update; cs is held low to shift pulses, then pulled high to update, etc. reset function pulsing v l below +0.8v initiates the power-up reset function. the switches are set to the off position, and the serial shift register is reset to all zeros. power-supply operation the max335 operates with v = 4.5v to 20v and v l = +5v. with v- tied to ground, the part operates with v+ = +10v to +30v. the v l supply sets ttl input compatibility at a 1.6v switching threshold. as v l is raised, the switching threshold is raised, so the part is no longer ttl com- patible. the max335 also operates with a single power supply: v l = v+ and v- = 0v. with v l tied to v+, the v l supply cannot be used as a reset function. serial controlled, 8-channel spst switch 10 ______________________________________________________________________________________ 1 clock pulse din figure 8. serial-input control for spdt switch ___________________chip topography v- din gnd no4 0.156" (3.96mm) 0.099" (2.51mm) no0 com0 com1 no2 com2 com3 no3 com4 com5 no5 com6 no6 com7 no7 dout v+ sclk cs vl no1 transistor count: 387 substrate connected to v+. figure 7. differential multiplexer input control 4 clock pulses din sclk d4 sw4 d sw
max335 serial controlled, 8-channel spst switch ______________________________________________________________________________________ 11 ________________________________________________________package information c a a2 e1 d e e a e b a3 b1 b dim a a1 a2 a3 b b1 c d d1 e e1 e e a e b l a min ? 0.015 0.125 0.055 0.016 0.050 0.008 1.235 0.050 0.300 0.240 ? 0.115 0? max 0.200 ? 0.150 0.080 0.022 0.065 0.012 1.265 0.080 0.325 0.280 0.400 0.150 15? min ? 0.38 3.18 1.40 0.41 1.27 0.20 31.37 1.27 7.62 6.10 ? 2.92 0? max 5.08 ? 3.81 2.03 0.56 1.65 0.30 32.13 2.03 8.26 7.11 10.16 3.81 15? inches millimeters 2.54 bsc 7.62 bsc 0.100 bsc 0.300 bsc a1 l d1 e 21-337a 24-pin plastic dual-in-line (narrow) package a l dim a a1 b c d e e h h l a min 0.093 0.004 0.014 0.009 0.598 0.291 0.394 0.010 0.016 0? max 0.104 0.012 0.019 0.013 0.614 0.299 0.419 0.030 0.050 8? min 2.35 0.10 0.35 0.23 15.20 7.40 10.00 0.25 0.40 0? max 2.65 0.30 0.49 0.32 15.60 7.60 10.65 0.75 1.27 8? inches millimeters a 24-pin plastic small-outline package h e d e a a1 c h x 45? 0.127mm 0.004in. b 1.27 bsc 0.050 bsc 21-338a
max335 serial contr olled, 8-channel spst switch ___________________________________________package infor mation (continued) c a e d e1 b1 b dim a b b1 c d e e1 e l l1 q s s1 a min 0.014 0.038 0.008 0.220 0.290 0.125 0.150 0.015 0.005 0? max 0.200 0.023 0.065 0.015 1.280 0.310 0.320 0.200 0.060 0.098 15? min 0.36 0.97 0.20 5.59 7.37 3.18 3.81 0.38 0.13 0? max 5.08 0.58 1.65 0.38 32.51 7.87 8.13 5.08 1.52 2.49 15? inches millimeters 2.54 bsc 0.100 bsc q l s1 e 21-340c 24-pin ceramic dual-in-line (narrow) package a s l1 12 ______________________________________________________________________________________
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 13 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. max335 serial contr olled, 8-channel spst switch ___________________________________________package infor mation (continued)

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