pi74fct521t 8-bit identity comparator 1 ps2019a 03/11/96 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 fast cmos 8-bit identity comparator logic block diagram 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct521t product description pericom semiconductor?s pi74fct series of logic circuits are pro- duced in the company?s advanced 0.8 micron cmos technology, achieving industry leading speed grades. the pi74fct521t is an 8-bit identity comparator. when two words of up to eight bits are compared, a bit-for-bit match of the two words provides a low output. the comparison can be extended over multiple words by the expansion input. the expansion input i a = b also serves as an active low enable input. product features ? pi74fct521t is pin compatible with bipolar fast? series at a higher speed and lower power consumption ? ttl input and output levels ? 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) b 0 o a=b a 0 b 1 a 1 b 2 a 2 b 3 a 3 b 4 a 4 b 5 a 5 b 6 a 6 b 7 a 7 i a=b
pi74fct521t 8-bit identity comparator 2 ps2019a 03/11/96 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 inputs output i a=b a, b o a=b l a = b* l la 1 bh h a = b* h ha 1 bh truth table (1) note: 1. h = high voltage level l = low voltage level, *a 0 = b 0 , a 1 = b 1 , a 2 = b 2 , etc. product pin description pin name description i a=b expansion or enable input (active low) o a=b identity output (active low) a 0 ?a 7 word a inputs b 0 ?b 7 word b inputs gnd ground v cc power product pin configuration 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 i a=b a 0 b 0 a 1 b 1 a 2 b 2 a 3 b 3 gnd vcc o a=b b 7 a 7 b 6 a 6 b 5 a 5 b 4 a 4 20-pin l20 p20 q20 r20 s20
pi74fct521t 8-bit identity comparator 3 ps2019a 03/11/96 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) storage temperature .................................................................... ?65c to +150c ambient temperature with power applied ..................................... -40c to +85c supply voltage to ground potential (inputs & vcc 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 ..................................................................................... 120 ma 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 = 5v 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 = ?15.0 ma 2.4 3.0 v v ol output low current v cc = min., v in = v ih or v il i ol = 48 ma 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 v cc = max. v in = v cc 1a i il input low current v cc = max. v in = gnd ?1 a v ik clamp diode voltage v cc = min., i in = ?18 ma ?0.7 ?1.2 v i os short circuit current v cc = max. (3) , v out = gnd ?60 ?120 ma i off power down disable v cc = gnd, v out = 4.5v ? ? 100 a 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 vcc = 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.
pi74fct521t 8-bit identity comparator 4 ps2019a 03/11/96 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 switching characteristics over operating range 521t 521at 521bt 521ct 521dt com. com. com. com. com. parameters description conditions (1) min max min max min max min max min max unit t plh propagation delay c l = 50 pf 1.5 10.0 1.5 7.2 1.5 5.5 1.5 4.5 1.5 4.2 ns t phl a n or b n to o a = b r l = 500 w t plh propagation delay 1.5 9.0 1.5 6.0 1.5 4.6 1.5 4.1 1.5 3.8 ns t phl i a = b to o a = b 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 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 v in = 3.4v 1.8 4.5 (5) 50% duty cycle v in = gnd one bit toggling notes: 1. for conditions shown as max. or min., use appropriate value specified under electrical characteristics for the applicable dev ice. 2. typical values are at vcc = 5.0v, +25c ambient. 3. per ttl driven input (v in = 3.4v); all other inputs at vcc 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 + d i 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. notes: 1. see test circuit and waveforms 2. minimum limits are guaranteed but not tested on propagation delays. pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 ? 1-800-435-2336 ? fax (408) 435-1100 ? http://www.pericom.com
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