PI5C32X2384 20-bit bus switch 1 ps8101c 01/18/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product features ? near-zero propagation delay ?25 w series resistor ?5 w switches connect inputs to outputs ? direct bus connection when switches are on ? ultra-low quiescent power 32x2384 (0.2a typical) C ideally suited for notebook applications ? packages available: C 48-pin 150-mil wide plastic bqsop (b) C 48-pin 240-mil wide plastic tssop (a) 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 PI5C32X2384 logic block diagram product pin configuration 48-pin a, b product pin description pin name description bex bus enable inputs (active low) a 19-a0 bus a b 19-b0 bus b gnd ground v cc power function be a be b b 4Cb0 b 19-b15 disconnect h h hi-z hi-z connect l h a4-a0 hi-z connect h l hi-z a19-a15 connect l l a4-a0 a19-a15 function be c be d b 9Cb5 b 14-b10 disconnect h h hi-z hi-z connect l h a9-a5 hi-z connect h l hi-z a14-a10 connect l l a9-a5 a14-a10 truth table (1) note: 1. h = high voltage level, l = low voltage level, hi-z = high impedance product description pericom semiconductors pi5c series of busswitch circuits are produced in the companys advanced sub-micron cmos technology, achieving industry leading performance. the PI5C32X2384 is a 20-bit bus switches designed with a low on resistance allowing inputs to be connected directly to outputs. the bus switch creates no additional propagational delay or additional ground bounce noise. the switches are turned on by the bus enable (be) input signal. four bus enable signals are provided, one for each of the upper and lower five bits of the two 10-bit buses. there is an internal 25 w series resistor to reduce noise reflection in high-speed applications. a 4 a 0 b 4 b 0 be a a 19 a 15 b 19 b 15 be b be c be d a 9 a 5 b 9 b 5 a 14 a 10 b 14 b 10 be a 1 b 0 2 a 0 3 a 1 4 b 1 5 b 2 6 a 2 7 a 3 8 b 3 9 b 4 10 a 4 11 gnd 12 be c 13 b 5 14 a 5 15 a 6 16 b 6 17 b 7 18 a 7 19 a 8 20 b 8 21 b 9 22 a 9 23 gnd 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 vcc b 19 a 19 a 18 b 18 b 17 a 17 a 16 b 16 b 15 a 15 be b vcc b 14 a 14 a 13 b 13 b 12 a 12 a 11 b 11 b 10 a 10 be d 20-bit bus switch with 25 w w w w w series resistor
PI5C32X2384 20-bit bus switch 2 ps8101c 01/18/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 storage temperature ........................................................... C65c to +150c ambient temperature with power applied .......................... C40c to +85c supply voltage to ground potential (inputs & vcc only) ... C0.5v to +7.0v supply voltage to ground potential (outputs & d/o only) C0.5v to +7.0v dc input voltage .................................................................. C0.5v 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 de- vice. this is a stress rating only and functional opera- tion 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 = C40c to +85c, v cc = 5v 5%) parameters description test conditions (1) min. typ (2) max. units 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 i ozh high impedance output current 0 - (a,b)(c,d) - v cc 1a i os short circuit current (3) a,b (c,d) = 0v, c,d (a,b) = v cc 300 ma v h input hysteresis at control pins 150 mv r on switch on resistance (4) v cc = min., v in = 0.0v 20 28 40 w i on = 48ma v cc = min., v in = 2.4v 20 35 48 w i on = 15ma capacitance (t a = 25c, f = 1 mhz) parameters (5) description test conditions typ max. units c in input capacitance v in = 0v 6 pf c off a/b capacitance, switch off v in = 0v 6 pf c on a/b capacitance, switch on v in = 0v 8 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, 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 ab and cd pin at indicated current through the switch. on resistance is determined by the lower of the voltages on the two (a or b, c or d) pins. 5. 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.)
PI5C32X2384 20-bit bus switch 3 ps8101c 01/18/99 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 or v cc PI5C32X2384 0.1 3.0 a supply current d i cc supply current per v cc = max. v in = 3.4v (3) 2.5 ma input @ ttl high i ccd supply current per v cc = max., 0.25 ma/ input per mhz (4) a and b pins open mhz be1 or be2 = gnd control input toggling 50% duty cycle 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, control inputs only); a and b pins do not contribute to icc. 4. this current applies to the control inputs only and represent the current required to switch internal capacitance at the spec ified frequency. the a and b inputs generate no significant ac or dc currents as they transition. this parameter is not tested, but i s guaranteed by design. PI5C32X2384 switching characteristics over operating range PI5C32X2384 parameters description conditions (1) min typ max units t plh propagation delay (2,3) c l = 50pf 1.25 ns t phl ax to bx, bx to ax r l = 500 w t pzh bus enable time 1.5 7.5 ns t pzl be x to ax or bx t phz bus disable time 1.5 5.5 ns t plz bex to ax or bx 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 1.25ns 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. propagatio nal delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interact ion with the load on the driven side. 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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