industrial temperature range idt74cbtlv3245 low-voltage octal bus switch 1 january 2001 industrial temperature range the idt logo is a registered trademark of integrated device technology, inc. ? 2001 integrated device technology, inc. dsc-5170/3 functional block diagram features: ? pin-out compatible with standard '245 logic products ?5 a/b bi-directional switch ? 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 ssop, qsop, and tssop packages applications: ? 3.3v high speed bus switching and bus isolation simplified schematic, each switch idt74cbtlv3245 low-voltage octal bus switch description: the octal bus switch has standard 245 pinouts. the cbtlv3245 is designed for asynchronous communication between data buses. when output enable ( oe ) is low, the 8-bit bus switch is on and port a is connected to port b. when oe is high, the switch is off and a high impedance exists between port a and port b. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pullup resistor. oe ab 2 9 19 a1 a8 oe b8 b1 18 11 sw sw
industrial temperature range 2 idt74cbtlv3245 low-voltage octal bus switch pin configuration qsop / ssop/ 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. note: 1. h = high voltage level l = low voltage level input oe operation l a port = b port h isolation function table (1) pin names description oe output enable (active low) a x port a inputs or outputs b x port b inputs or outputs pin description v cc oe b 1 b 2 b 3 b 4 b 5 b 6 b 7 b 8 a 1 a 2 a 3 a 4 a 6 a 7 a 8 gnd 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 nc a 5
industrial temperature range idt74cbtlv3245 low-voltage octal 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 ? ? 5 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) v o = 3v or 0, oe = v cc ?6 ?pf 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 en output enable time 1 4.5 1 4.2 ns oe to a or b t dis output disable time 1 5 1 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.
industrial temperature range 4 idt74cbtlv3245 low-voltage octal 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 pd open switch position
industrial temperature range idt74cbtlv3245 low-voltage octal bus switch 5 idt xx cbtlv xxx xx package device type temp. range py q qg pg pgg 74 shrink small outline package quarter-size small outline package qsop - green thin shrink small outline package tssop - green low-voltage octal bus switch ?40c to +85c 3245 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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