1 ps8149b 12/10/99 v cc be 1 120 be 2 219 1 b 0 1 a 0 318 2 a 3 2 b 3 417 1 b 1 1 a 1 516 2 a 2 2 b 2 615 1 b 2 1 a 2 714 2 a 1 2 b 1 813 1 b 3 1 a 3 912 2 a 0 2 b 0 10 11 gnd product description pericom semiconductor?s pi3c series of logic circuits are produced using the company?s advanced submicron cmos technology, achieving industry leading performance. the PI3C3244 features a set of 2.5v or 3.3v 8-bit bus switches, which is a pinout and function compatible with the p74fct244t, 74f244, and 74als/as/ls2448-bit drivers. two enable signals (ben) turn the switches on similar to the enable signals of the 244. the bus switch create no additional propagation delay or ground bounce noise. it is very useful in switching signals that have high bandwidth (>400 mhz). truth table (1) note: 1. h = high voltage level l = low voltage level logic block diagram product pin description pin name description ben bus enable input (active low) a0?7 bus a b0?7 bus b gnd ground v cc power product pin configuration PI3C3244 2.5v/3.3v, high bandwidth, hot insertion, 8-bit, 2-port bus switch 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product features ? near zero propagation delay ? high bandwidth (>400 mhz) ? rail-to-rail 3.3v or 2.5v switching ? 5v i/o tolerant ? 2.5v supply voltage operation ? permits hot insertion ? pin compatible with 74 series 244 logic devices ? packages available: ? 20-pin 150 mil wide plastic qsop (q) ? 20-pin 173 mil wide plastic tssop (l) 20-pin l,q 1 e b2 e bb 1 , a 1b 2 , a 2 hh t c e n n o c s i dt c e n n o c s i d lh b 1 = a 1t c e n n o c s i d hl t c e n n o c s i db 2 = a 2 ll b 1 = a 1b 2 = a 2 be 2 be 1 1b 1 1b 0 1a 1 1a 0 1b 1 1b 0 1a 3 1a 2 2b 1 2b 0 2a 1 2a 0 2b 3 2b 2 2a 3 2a 2
2 ps8149b 12/10/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PI3C3244 2.5v/3.3v, high bandwidth, hot insertion, 8-bit, 2-port bus switch dc electrical characteristics (over operating range, t a = C40c to +85c, v cc = 3.3v 10%) parameters description test conditions (1) min. typ. (2) max. units v ih input high voltage guaranteed logic high level 2.0 v il input low voltage guaranteed logic low level C0.5 0.8 i ih input high current v cc = max., v in = v cc 1 i il input low current v cc = max., v in = gnd 1 a i ozh high impedance output current 0 a, b v cc 1 v ik clamp diode voltage v cc = min., i in = C18ma C0.73 C1.2 v r on switch on resistance (4) v cc = min., v in = 0.0v, i on = 48ma or 64ma 5 7 w v cc = min., v in = 2.4v, i on = 15ma 8 15 parameters (5) description test conditions typ. units c in input capacitance v in = 0v 3.5 c off a/b capacitance, switch off v in = 0v 5.0 pf c on a/b capacitance, switch on v in = 0v 10.0 storage temperature..................................................... ?65c to +150c ambient temperature with power applied ....................... ?40c to +85c supply voltage to ground potential .................................. ?0.5v to +4.6v dc input voltage ............................................................... ?0.5v to +5.5v 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. 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 = 3.3v, t a = 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. measured by the voltage drop between a and b pin at indicated current through the switch. on resistance is determined by the lower of the voltages on the two (a,b) pins. 5. this parameter is determined by device characterization but is not production tested. v maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) capacitance (t a = 25c, f = 1 mhz)
PI3C3244 2.5v/3.3v, high bandwidth, hot insertion, 8-bit, 2-port bus switch 3 ps8149b 12/10/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PI3C3244 com. parameters description conditions (1) min. max. units t plh propagation delay (2,3) c l = 50 pf, 0.25 t phl ax to bx r l = 500 w t pzh bus enable time 1.5 6.5 ns t pzl be to ax or bx c l = 50 pf, t phz bus disable time r l = 500 w, 1.5 5.5 t plz be to ax or bx r = 500 w 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 260 500 supply current d i cc supply current per v cc = max. v in = 3.0v (3) 750 input high 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 = 3.3v, +25c ambient. 3. per driven input (control input only); a and b pins do not contribute to d i cc . switching characteristics over 3.3v operating range a PI3C3244 com. parameters description conditions (1) min. max. units t plh propagation delay (2,3) c l = 50 pf, 0.25 t phl ax to bx r l = 500 w t pzh bus enable time 1.5 9.8 ns t pzl be to ax or bx c l = 50 pf, t phz bus disable time r l = 500 w, 1.5 8.3 t plz be to ax or bx r = 500 w switching characteristics over 2.5v operating range notes: 1. see test circuit and waveforms. 2. this parameter is guaranteed but not tested on propagation delays. 3. the bus switch contributes no propagational delay other than the rc delay of the on resistance of the switch and the load capacitance. the time constant for the switch alone is of the order of 0.25ns for 50pf load. since this time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. propagational dela y of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction wit h the load on the driven side.
4 ps8149b 12/10/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PI3C3244 2.5v/3.3v, high bandwidth, hot insertion, 8-bit, 2-port bus switch pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 ? 1-800-435-2336 ? fax (408) 435-1100 ? http://www.pericom.com 4.0 2.0 0.0 0.0 1.0 2.0 3.0 4.0 5.0 v out , (v) v in , (v) v cc = 3.3v 3.1v 2.9v 2.7v 2.5v 2.3v 3.6v 3.8v 3.4v 3.2v 3.0v 2.8v output voltage vs. input voltage over various supply voltages t r a pe g a k c a p - n i pe r u t a r e p m e t l 4 4 2 3 c 3 i p) l ( p o s s t - 0 2c 5 8 + o t c 0 4 ? q 4 4 2 3 c 3 i p) q ( p o s q - 0 2c 5 8 + o t c 0 4 ? ordering information output voltage vs. input voltage over various supply voltages
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