164 PI5C32X2245 16-bit, 2-port busswitch with 25 w w w w w series resistor ps8195 05/05/98 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product features: ? near-zero propagation delay ?25 w series resistor termination ?5 w switches connect inputs to outputs ? direct bus connection when switches are on ? ultra-low quiescent power (0.2 a typical) C ideally suited for notebook applications ? pin compatible with qs32x245 ? industrial operating temperature: C40c to +85c ? packages available: C 40-pin 150 mil wide plastic bqsop (b) PI5C32X2245 logic block diagram product pin configuration product pin description pin name i/o description ben i bus enable input (active low) a 0 -a 15 i/o bus a b 0 -b 15 i/o bus b function ben a 0C15 disconnect h hi-z connect l b 0C15 truth table (1) note: 1. h= high voltage level l = low voltage level hi-z = high impedance product description: pericom semiconductors pi5c series of logic circuits are pro- duced in the companys advanced 0.6 micron cmos technology. the PI5C32X2245 is a 16-bit, 2-port bus switch . two enable signals (ben) turn the switches on. the bus switch creates no additional propagational delay or additional ground bounce noise. the device has a built-in 25 w resistor to reduce noise resulting from reflections, thus eliminating the need for an external terminating resistor. 16-bit, 2-port busswitch with 25 w w w w w series resistor 40-pin b
165 PI5C32X2245 16-bit, 2-port busswitch with 25 w w w w w series resistor ps8195 05/05/98 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 dc electrical characteristics (over the operating range, t a = C40c to +85c, v cc = 5v 10%) parameters description test conditions (1) min. typ (2) max. units v ih input high voltage guaranteed logic high level 2.0 C C v v il input low voltage guaranteed logic low level C0.5 C 0.8 v i ih input high current v cc = max., v in = v cc CC1a i il input low current v cc = max., v in = gnd C C 1 a i ozh high impedance output current 0 - a, b - v cc CC1a v ik clamp diode voltage v cc = min., i in = C18 ma C C0.7 C1.2 v i os short circuit current (3) a (b) = 0v, b (a) = v cc 100 C C ma v h input hysteresis at control pins C 150 C mv r on switch on resistance (4) v cc = min., v in = 0.0v, i on = 48 ma C 28 40 w v cc = min., v in = 2.4v, i on = 15 ma C 35 48 w maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) 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. capacitance (t a = 25c, f = 1 mhz) parameters (5) description test conditions typ 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 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, 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.
166 PI5C32X2245 16-bit, 2-port busswitch with 25 w w w w w series resistor ps8195 05/05/98 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 or v cc 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 ben = gnd control input toggling 50% duty cycle notes: 1. for 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, 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. PI5C32X2245 switching characteristics over operating range PI5C32X2245 com. parameters description conditions (1) min. max. unit t plh propagation delay (2,3) c l = 50 pf 1.25 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 t plz bex to ax or bx notes: 1. see test circuit and wave forms. 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 0.25 ns for 50 pf 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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