1 industrial temperature range idt74cbtlv16245 low-voltage 16-bit bus switch june 2006 2006 integrated device technology, inc. dsc-5885/9 c industrial temperature range applications: ? 3.3v high speed bus switching and bus isolation features: ?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 tssop and tvsop packages the idt logo is a registered trademark of integrated device technology, inc. oe a b 47 1a1 1a8 37 48 1oe sw sw 1b8 1b1 2 12 25 2oe sw sw 2b8 2b1 13 23 36 2a1 2a8 26 idt74cbtlv16245 functional block diagram low-voltage 16-bit bus switch description: the cbtlv16245 is a set of 16-bit bus switches. it has standard 16245 pinouts. the device is organized as dual 8-bit low resistance switches with independent output enable (x oe ) control inputs. the switches can be turned on under the control of the lvttl-compatible output enable signals (x oe ) for bidirectional data flow between port a and port b. when x 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. simplified schematic, each switch
2 industrial temperature range idt74cbtlv16245 low-voltage 16-bit bus switch absolute maximum ratings (1) symbol description max. unit v cc supply voltage 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 range ?65 to +150 c 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. pin configuration operating characteristics (1) 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 note: 1. all unused control inputs of the device must be held at v cc or gnd to ensure proper device operation. tssop/ tvsop top view 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 1oe 2oe 1 a 1 gnd 1 a 2 1 a 3 1 a 4 nc nc 1 a 5 1 a 6 1 a 7 1 a 8 2 a 1 gnd 2 a 2 2 a 3 2 a 4 gnd v cc 2 a 5 2 a 6 2 a 7 2 a 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 nc 1 b 1 gnd 1 b 2 1 b 3 1 b 4 nc nc 1 b 5 1 b 6 1 b 7 1 b 8 2 b 1 gnd 2 b 2 2 b 3 2 b 4 gnd v cc 2 b 5 2 b 6 2 b 7 2 b 8 nc note: 1. h = high voltage level l = low voltage level input oe operation l a-port = b-port h disconnect function table (each 8-bit bus switch) (1) pin names description xoe output enable (active low) x a x port a inputs or outputs x b x port b inputs or outputs pin description
3 industrial temperature range idt74cbtlv16245 low-voltage 16-bit bus switch dc electrical characteristics over operating range following conditions apply unless otherwise specified: operating condition: t a = ?40c to +85c notes: 1. typical values are at 3.3v, +25 c ambient. 2. the increase in supply current is attributable to each input 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. symbol parameter test conditions min. typ. (1) max. unit v ik control inputs, data i/o v cc = 3v, i i = ?18ma ? ? ?1.2 v i i control inputs v cc = 3.6v, v i = v cc or gnd ? ? 1 a i oz data i/o v cc = 3.6v, v o = 0v or 3.6v switch disabled ? ? 5 a i off v cc = 0v, v i or v o = 0v or 3.6v ? ? 10 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 ?9?pf max. at 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 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 5 1 4.5 ns oe to a or b t dis output disable time 1 5.5 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 when driven by an ideal voltage source (zero output impededance). switching characteristics
4 industrial temperature range idt74cbtlv16245 low-voltage 16-bit 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 propagation delay test circuits for all outputs enable and disable times note: 1. diagram shown for input control enable-low and input control disable-high. definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. 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 2ns. test switch t plz /t pzl v load t phz /t pzh gnd t pd open switch position 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
5 industrial temperature range idt74cbtlv16245 low-voltage 16-bit bus switch ordering information idt xx cbtlv xxx xx package device type temp. range pa pag pf pfg 74 thin shrink small outline package tssop - green thin very small outline package tvsop - green low-voltage 16-bit bus switch ?40c to +85c 16245 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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