industrial temperature range idt74cbtlv3257 low-voltage quad 2:1 mux/demux bus switch 1 october 2008 industrial temperature range the idt logo is a registered trademark of integrated device technology, inc. ? 2006 integrated device technology, inc. dsc-5744/4 functional block diagram features: ? functionally equivalent to qs3257 ?5 switch connection between two ports ? isolation under power-off conditions ? over-voltage tolerant ? latch-up performance exceeds 100ma ?v cc = 2.3v - 3.6v, normal range ? esd > 2000v per mil-std-883, method 3015; > 200v using machine model (c = 200pf, r = 0) ? available in qsop and tssop packages idt74cbtlv3257 low-voltage quad 2:1mux/demux bus switch from enable circuitry a b 1a 1b2 2b2 3b2 4a sw sw sw sw sw sw sw 1b1 2b1 3b1 2a 3a 4b2 4b1 s oe sw description: the cbtlv3257 is a quad 2:1 multiplexer/demultiplexer. the low on- state resistance of the switch allows connections to be made with minimal propagation delay. the select (s) input controls the data flow. the multiplexers/demultiplexers are enabled when the output-enable ( oe ) input is low. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. simplified schematic, each switch applications: ? 3.3v high speed bus switching, multiplexing, and bus isolation
industrial temperature range 2 idt74cbtlv3257 low-voltage quad 2:1 mux/demux bus switch pin configuration qsop / tssop top view symbol parameter test conditions min. max. unit v cc supply voltage 2.3 3.6 v v ih high-level control input voltage v cc = 2.3v to 2.7v 1.7 ? v v cc = 2.7v to 3.6v 2 ? v il low-level control input voltage v cc = 2.3v to 2.7v ? 0.7 v v cc = 2.7v to 3.6v ? 0.8 t a operating free-air temperature ? 40 85 c operating characteristics, t a = 25c (1) note: 1. all unused control inputs of the device must be held at v cc or gnd to ensure proper device operation. symbol description max unit v cc supplyvoltage range ?0.5 to +4.6 v v i input voltage range ?0.5 to +4.6 v continuous channel current 128 ma i ik input clamp current, v i/o < 0 ?50 ma t stg storage temperature ?65 to +150 c absolute maximum ratings (1) note: 1. stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. v cc s 4b1 1b2 4b2 1a 4a 2b1 3b1 2b2 3b2 2a 1b1 oe gnd 3a 16 1 314 413 512 6 11 7 10 2 15 9 8 note: 1. h = high voltage level l = low voltage level x = don't care inputs oe s function l l a port = b1 port l h a port = b2 port h x disconnect function table (1)
industrial temperature range idt74cbtlv3257 low-voltage quad 2:1 mux/demux bus switch 3 symbol parameter test conditions min. typ. (1) max. unit v ik control inputs, data inputs v cc = 3v, i i = ?18ma ? ? ?1.2 v i i control inputs v cc = 3.6v, v i = v cc or gnd ? ? 1a i oz data i/o v cc = 3.6v, v o = 0 or 3.6v, switch disabled ? ? 20 a i off v cc = 0, v i or v o = 0 to 3.6v ? ? 50 a i cc v cc = 3.6v, i o = 0, v i = v cc or gnd ? ? 10 a i cc (2) control inputs v cc = 3.6v, one input at 3v, other inputs at v cc or gnd ? ? 300 a c i control inputs v i = 3v or 0 ? 4 ? pf c io(off) a port v o = 3v or 0, oe = v cc = 3.3v ? 13 ? pf b port ?6 ? v cc = 2.3v v i = 0 i o = 64ma ? 5 8 typ. at v cc = 2.5v i o = 24ma ? 5 8 r on (3) v i = 1.7v i o = 15ma ? 27 40 v i = 0 i o = 64ma ? 5 7 v cc = 3v i o = 24ma ? 5 7 v i = 2.4v i o = 15ma ? 10 15 dc electrical characteristics over operating range following conditions apply unless otherwise specified: operating conditions: t a = ?40c to +85c v cc = 2.5v 0.2v v cc = 3.3v 0.3v symbol parameter min. max. min. max. unit t pd (1) propagation delay ? 0.15 ? 0.25 ns a to b or b to a t sel select time 1 6.1 1 5.3 ns s to a or b t en enable time 1 6.1 1 5.3 ns s to b t dis disable time 1 4.8 1 4.5 ns s to b t en output enable time 1 5.6 1 5 ns oe to a or b t dis output disable time 1 5.5 1 5.5 ns oe to a or b note: 1. the propagation delay is the calculated rc time constant of the typical on-state resistance of the switch and the specified l oad capacitance driven by an ideal voltage source (zero output impedance). switching characteristics notes: 1. typical values are at v cc = 3.3v, +25c ambient. 2. the increase in supply current is attributable to each current that is at the specified voltage level rather than v cc or gnd. 3. this is measured by the voltage drop between the a and b terminals at the indicated current through the switch. on-state resi stance is determined by the lower of the voltages of the two (a or b ) terminals.
industrial temperature range 4 idt74cbtlv3257 low-voltage quad 2:1 mux/demux bus switch open v load gnd v cc pulse generator d.u.t. 500 500 c l r t v in v out (1, 2) same phase input transition opposite phase input transition 0v 0v v oh v ol t plh t phl t phl t plh output v ih v t v t v ih v t control input t plz 0v output normally low t pzh 0v switch closed output normally high enable disable switch open t phz 0v v ol + v lz v oh v t v t t pzl v load/2 v load/2 v ih v t v ol v oh - v hz test circuits and waveforms test circuits for all outputs enable and disable times propagation delay notes: 1. pulse generator for all pulses: rate 10mhz; t f 2.5ns; t r 2.5ns. 2. pulse generator for all pulses: rate 10mhz; t f 2ns; t r 2.5ns. definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. symbol v cc (1) = 3.3v0.3v v cc (2) = 2.5v0.2v unit v load 6 2 x vcc v v ih 3 vcc v v t 1.5 vcc / 2 v v lz 300 150 mv v hz 300 150 mv c l 50 30 pf test conditions test switch t plz /t pzl v load t phz /t pzh gnd t sel open t pd open switch position
industrial temperature range idt74cbtlv3257 low-voltage quad 2:1 mux/demux bus switch 5 xx cbtlv xxx xx package device type temp. range q qg pg pgg 74 quarter-size small outline package qsop - green thin shrink small outline package tssop - green low-voltage quad 2:1 mux/demux bus switch ?40c to +85c 3257 ordering information corporate headquarters for sales: for tech support: 6024 silver creek valley road 800-345-7015 or 408-284-8200 logichelp@idt.com san jose, ca 95138 fax: 408-284-2775 www.idt.com
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