1 ps2012b 09/22/99 product pin configuration inputs oe t/r outputs l l bus b data to bus a (2) l h bus a data to bus b (2) h x high z state 1. h = high voltage level, x = don't care, l = low voltage level, z = high impedance 2. 640 is inverting from input to output. truth table (1) pin name description oe 3-state output enable inputs (active low) t/r transmit/receive input a 0 -a 7 side a inputs or 3-state outputs b 0 -b 7 side b inputs or 3-state outputs gnd ground v cc power product pin description fast cmos octal bidirectional transceivers 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct245t/640t/645t pi74fct2245t/2640t/2645t (25 w w w w w series) fct245, 2245, 645, 2645 are non-inverting options. fct640 & fct2640 are inverting options. logic block diagram product description pericom semiconductor?s pi74fct series of logic circuits are produced using the company?s advanced 0.6/0.8 micron cmos technology, achieving industry leading speed grades. all pi74fct2xxx devices have a built-in 25 ohm series resistor on all outputs to reduce noise because of reflections, thus eliminating the need for an external terminating resistor. the pi74fct245t/640t/645t and pi74fct2245t/2640t/2645t are 8-bit wide octal buffer bidirectional transceivers designed for asynchronous two-way communication between data buses. the transmit/receive (t/r) input determines the direction of data flow through the bidirectional transceiver. transmit (active high) enables data from a ports to b ports, and receive (active low) from b ports to a ports. the output enable (oe) input, when high, disables both a and b ports by placing them in high z condition. product features ? pi74fct245/640/645t and pi74fct2245/2640t/2645t are pin compatible with bipolar fast? series at a higher speed and lower power consumption ? 25 ohm series resistor on all outputs (fct2xxx only) ? ttl input and output levels ? low ground bounce outputs ? extremely low static power ? hysteresis on all inputs ? industrial operating temperature range: ?40c to +85c ? packages available: ? 20-pin 173 mil wide plastic tssop (l) ? 20-pin 300 mil wide plastic dip (p) ? 20-pin 150 mil wide plastic qsop (q) ? 20-pin 150 mil wide plastic tqsop (r) ? 20-pin 300 mil wide plastic soic (s) ? 20-pin 209 mil wide plastic ssop (h) ? device models available on request 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 t/r a 0 a 1 a 2 a 3 a 4 a 5 a 6 a 7 gnd vcc oe b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 20-pin l,p,q r,s,h a0 b0 oe a1 b1 a2 b2 a3 b3 a4 b4 a5 b5 a6 b6 a7 b7 t/r
2 ps2012b 09/22/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct245t/640t/645t 25 ohm series pi74fct2245t/2640t/2645t octal bidirectionaltransceivers storage temperature .................................................................... ?65c to +150c ambient temperature with power applied .................................... ?40c to +85c supply voltage to ground potential (inputs & v cc only) ............. ?0.5v to +7.0v supply voltage to ground potential (outputs & d/o only) ........... ?0.5v to +7.0v dc input voltage ............................................................................ ?0.5v to +7.0v dc output current ...................................................................................... 120ma power dissipation .......................................................................................... 0.5w note: stresses greater than those listed under 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. dc electrical characteristics (over the operating range, t a = ?40c to +85c, v cc = 5.0v 5%) parameters description test conditions (1) min. typ (2) max. units v oh output high voltage v cc = min., v in = v ih or v il i oh = ?15.0ma 2.4 3.0 v v ol output low current v cc = min., v in = v ih or v il i ol = 64ma 0.3 0.55 v v ol output low current v cc = min., v in = v ih or v il i ol = 12ma (25 w series) 0.3 0.50 v v ih input high voltage guaranteed logic high level 2.0 v v il input low voltage guaranteed logic low level 0.8 v i ih input high current (except i/o pins) v cc = max. v in = v cc 1a i il input low current (except i/o pins) v cc = max. v in = gnd ?1 a i ih input high current (i/o pins only) v cc = max. v in = v cc 1a i il input low current (i/o pins only) v cc = max. v in = gnd ?1 a i ozh high impedance v cc = m ax .v out = 2.7v 1 a i ozl output current v out = 0.5v ?1 a v ik clamp diode voltage v cc = min., i in = ?18 ma ?0.7 ?1.2 v i off power down disable v cc = gnd, v out = 4.5v ? ? 100 a i os short circuit current v cc = max. (3) , v out = gnd ?60 ?120 ma v h input hysteresis 200 mv capacitance (t a = 25c, f = 1 mhz) parameters (4) description test conditions typ. max. units c in input capacitance v in = 0v 6 10 pf c out output capacitance v out = 0v 8 12 pf notes: 1. for max. or min. conditions, use appropriate value specified under electrical characteristics for the applicable device type . 2. typical values are at v cc = 5.0v, +25c ambient and maximum loading. 3. not more than one output should be shorted at one time. duration of the test should not exceed one second. 4. this parameter is determined by device characterization but is not production tested. maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.)
3 ps2012b 09/22/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct245t/640t/645t 25 ohm series pi74fct2245t/2640t/2645t octal bidirectionaltransceivers power supply characteristics parameters description test conditions (1) min. typ (2) max. units i cc quiescent power v cc = max. v in = gnd or v cc 0.1 500 a supply current d i cc supply current per v cc = max., v in = 3.4v (3) 0.5 2.0 ma input @ ttl high i ccd supply current per v cc = max., v in = v cc 0.15 0.25 ma/ input per mhz (4) outputs open v in = gnd mhz oe = gnd t/r = gnd or v cc one input toggling 50% duty cycle i c total power supply v cc = max., v in = v cc 1.5 3.5 (5) ma current (6) outputs open v in = gnd f i = 10 mh z 50% duty cycle v in = 3.4v 1.8 4.5 (5) t/r = oe = gnd v in = gnd one bit toggling v cc = max., v in = v cc 3.0 6.0 (5) outputs open v in = gnd f i = 2.5 mh z 50% duty cycle v in = 3.4v 5.0 14.0 (5) t/r = oe = gnd v in = gnd eight bits toggling notes: 1. for max. or min. conditions, use appropriate value specified under electrical characteristics for the applicable device. 2. typical values are at v cc = 5.0v, +25c ambient. 3. per ttl driven input (v in = 3.4v); all other inputs at v cc or gnd. 4. this parameter is not directly testable, but is derived for use in total power supply calculations. 5. values for these conditions are examples of the icc formula. these limits are guaranteed but not tested. 6. i c =i quiescent + i inputs + i dynamic i c = i cc + di cc d h n t + i ccd (f cp /2 + f i n i ) i cc = quiescent current d i cc = power supply current for a ttl high input (v in = 3.4v) d h = duty cycle for ttl inputs high n t = number of ttl inputs at d h i ccd = dynamic current caused by an input transition pair (hlh or lhl) f cp = clock frequency for register devices (zero for non-register devices) f i = input frequency n i = number of inputs at f i all currents are in milliamps and all frequencies are in megahertz.
4 ps2012b 09/22/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct245t/640t/645t 25 ohm series pi74fct2245t/2640t/2645t octal bidirectionaltransceivers pi74fct245t/2245t switching characteristics over operating range 245t/2245t 245at/2245at 245ct/2245ct 245dt com. com. com. com. parameters description conditions (1) min. max. min. max. min. max. min max. unit t plh propagation delay c l = 50 pf 1.5 7.0 1.5 4.6 1.5 4.1 1.5 3.8 n s t phl a to b, b to a r l = 500 ohm t pzh output enable time 1.5 9.0 1.5 6.2 1.5 5.8 1.5 5.0 ns t pzl oe to a or b t phz output disable time 1.5 7.5 1.5 5.0 1.5 4.8 1.5 4.3 ns t plz oe to a or b (3) t pzh output enable time 1.5 9.0 1.5 6.2 1.5 5.8 1.5 5.0 ns t pzl t/r to a or b t phz output disable time (3) 1.5 7.5 1.5 5.0 1.5 4.8 1.5 4.3 n s t plz t/r to a or b (3) notes: 1. see test circuit and waveforms. 2. minimum limits are guaranteed but not tested on propagation delays. 3. this parameter is guaranteed but not production tested. pi74fct640t/2640t switching characteristics over operating range 640t/2640t 640at/2640at 640ct/2640ct 640dt com. com. com. com. parameters description conditions (1) min. max. min. max. min. max. min. max. unit t plh propagation delay c l = 50 pf 2.0 7.0 1.5 5.0 1.5 4.4 1.5 3.7 n s t phl a to b, b to a r l = 500 ohm t pzh output enable time 2.0 13.0 1.5 6.2 1.5 5.8 1.5 5.0 n s t pzl oe to a or b t phz output disable time 2.0 10.0 1.5 5.0 1.5 4.8 1.5 4.3 n s t plz oe to a or b (3) t pzh output enable time 2.0 13.0 1.5 6.2 1.5 5.8 1.5 5.0 n s t pzl t/r to a or b t phz output disable time (3) 2.0 10.0 1.5 5.0 1.5 4.8 1.5 4.3 n s t plz t/r to a or b (3) pi74fct645t/2645t switching characteristics over operating range 645t/2645t 645at/2645at 645ct/2645ct 645dt com. com. com. com. parameters description conditions (1) min. max. min. max. min. max. min. max. unit t plh propagation delay c l = 50 pf 1.5 9.5 1.5 4.6 1.5 4.1 1.5 3.8 n s t phl a to b, b to a r l = 500 ohm t pzh output enable time 1.5 11.0 1.5 6.2 1.5 5.8 1.5 5.0 n s t pzl oe to a or b t phz output disable time 1.5 12.0 1.5 5.0 1.5 4.8 1.5 4.3 n s t plz oe to a or b (3) t pzh output enable time 1.5 11.0 1.5 6.2 1.5 5.8 1.5 5.0 n s t pzl t/r to a or b t phz output disable time (3) 1.5 12.0 1.5 5.0 1.5 4.8 1.5 4.3 n s t plz t/r to a or b (3) pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 ? 1-800-435-2336 ? fax (408) 435-1100 ? http://www.pericom.com
|
