1 ps2004a 03/09/96 pi74fct138/pi74fct238t 1-of-8 decoder 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product description pericom semiconductor?s pi74fct series of logic circuits are produced using the company?s advanced 0.8 micron cmos technology, achieving industry leading speed grades. these high-speed decoders accept three binary weighted inputs (a 0 , a 1 , a 2 ) and gives eight mutually exclusive active low outputs (o 0 -o 7: pi74fct138t) or active high outputs (o0-o7: pi74fct238t) when enabled. these devices contain three enable inputs, two active low (e 1 , e 2 ) and one active high (e 3 ). on the pi74fct138t all outputs will be high and on the pi74fct238t all outputs will be low, except when e 1 and e 2 are low and e 3 is high. product features ? pi74fct138/238t 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: ? 16-pin 150 mil wide plastic qsop (q) ? 16-pin 300 mil wide plastic soic (s) ? 16-pin 150 mil wide plastic soic (w) 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 fast cmos 1-of-8 decoder logic block diagram pi74fct138t pi74fct238t pi74fct138t function shown. o 0 o 1 o 2 o 3 o 4 o 5 o 6 o 7 a 2 a 1 a 0 e 1 e 2 e 3
2 ps2004a 03/09/96 pi74fct138/pi74fct238t 1-of-8 decoder 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct138t product pin configuration pi74fct138t product pin description pin name description a 0 -a 2 address inputs e 1 , e 2 enable inputs (active low) e 3 enable input (active high) o 0 -o 7 outputs (active low) pi74fct138t truth table (1) inputs outputs e 1 e 2 e 3 a 0 a 1 a 2 o 0 o 1 o 2 o 3 o 4 o 5 o 6 o 7 function hxxxxx hhhhhhhh disable xhxxxx hhhhhhhh disable x x l x x x hhhhhhhh disable llhllll hhhhhhh a2-0 = 0 l l h h l l hlhhhhhh a2-0 = 1 llhlhlhhl hhhhh a2-0 = 2 l l h h h l hhhlhhhh a2-0 = 3 l l h l l h h h h h l h h h a2-0 = 4 l l h h l h hhhhhlhh a2-0 = 5 l l h l h h hhhhhhlh a2-0 = 6 l lhhhh hhhhhhhl a2-0 = 7 note: 1. h = high voltage level l = low voltage level x = don't care v cc 1 a 0 16 o 0 2 a 1 15 o 1 3 a 2 14 o 2 4 e 1 13 o 3 5 e 2 12 o 4 6 e 3 11 o 5 7 o 7 10 o 6 8 gnd 9 16-pin q, s, w
3 ps2004a 03/09/96 pi74fct138/pi74fct238t 1-of-8 decoder 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct238t product pin configuration pi74fct238t truth table (1) inputs outputs e 1 e 2 e 3 a 0 a 1 a 2 o 0 o 1 o 2 o 3 o 4 o 5 o 6 o 7 function hxxxxx llllllll disable xhxxxx llllllll disable x x l x x x llllllll disable l l h l l l hlllllll a2-0 = 0 l l h h l l lhllllll a2-0 = 1 llhlhlllh lllll a2-0 = 2 l l h h h l lllhllll a2-0 = 3 l l h l l h l l l l h l l l a2-0 = 4 l l h h l h lllllhll a2-0 = 5 llhlhh llllllhl a2-0 = 6 l lhhhh lllllllh a2-0 = 7 note: 1. h = high voltage level l = low voltage level x = don't care pi74fct238t product pin description pin name description a 0 -a 2 address inputs e 1 , e 2 enable inputs (active low) e 3 enable input (active high) o 0 -o 7 outputs (active high) v cc 1 a 0 16 o 0 2 a 1 15 o 1 3 a 2 14 o 2 4 e 1 13 o 3 5 e 2 12 o 4 6 e 3 11 o 5 7 o 7 10 o 6 8 gnd 9 16-pin q16 s16 w16
4 ps2004a 03/09/96 pi74fct138/pi74fct238t 1-of-8 decoder 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 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 = 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 = ?15.0 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 ?225 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.
5 ps2004a 03/09/96 pi74fct138/pi74fct238t 1-of-8 decoder 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 power supply characteristics parameters description test conditions (1) min. typ (2) max. units i cc quiescent power v cc = max. v in = gnd 0.1 500 a supply current or v cc 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., outputs open v in = v cc 0.15 0.3 ma/ input per mhz (4) one input toggling v in = gnd mhz 50% duty cycle i c total power supply v cc = max., outputs open v in = v cc 1.5 4.0 (5) ma current (6) f cp = 10 mh z , 50% duty cycle v in = gnd toggle e 1 , e 2 , or e 3 v in = 3.4v 1.8 5.0 (5) one bit toggling v in = gnd notes: 1. fo max. or min. conditions, use appropriate value specified under electrical characteristics for the applicable device. 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) fo = output frequency no = number of outputs at fo all currents are in milliamps and all frequencies are in megahertz.
6 ps2004a 03/09/96 pi74fct138/pi74fct238t 1-of-8 decoder 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi74fct138t switching characteristics over operating range 138t 138at 138ct com. com. com. parameters description conditions (1) min max min max min max t plh propagation delay c l = 50 pf 1.5 9.0 1.5 5.8 1.5 5.1 t phl an to on r l = 500 w t plh propagation delay 1.5 9.0 1.5 5.9 1.5 5.2 t phl e1 or e2 to on t plh propagation delay 1.5 9.0 1.5 5.9 1.5 5.2 t phl e3 to on notes: 1. see test circuit and wave forms. 2. minimum limits are guaranteed but not tested on propagation delays. pi74fct238t switching characteristics over operating range 238t 238at 238ct com. com. com. parameters description conditions (1) min max min max min max unit t plh propagation delay c l = 50 pf 1.5 9.0 1.5 5.8 1.5 5.0 ns t phl an to on r l = 500 w t plh propagation delay 1.5 8.0 1.5 5.9 1.5 5.0 ns t phl e1 or e2 to on t plh propagation delay 1.5 8.0 1.5 5.9 1.5 5.0 ns t phl e3 to on notes: 1. see test circuit and wave forms. 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
|
