1 ps8189c 09/13/99 nc 1 1 b 0 2 1 b 1 3 gnd 4 1 b 2 5 1 b 3 6 v cc 7 1 b 4 8 1 b 5 9 gnd 10 1 b 6 11 1 b 7 12 2 b 0 13 2 b 1 14 gnd 15 2 b 2 16 2 b 3 17 v cc 18 2 b 4 19 2 b 5 20 gnd 21 2 b 6 22 2 b 7 23 nc 24 1 be 48 1 a 0 47 1 a 1 46 gnd 45 1 a 2 44 1 a 3 43 v cc 42 1 a 4 41 1 a 5 40 gnd 39 1 a 6 38 1 a 7 37 2 a 0 36 2 a 1 35 gnd 34 2 a 2 33 2 a 3 32 v cc 31 2 a 4 30 2 a 5 29 gnd 28 2 a 6 27 2 a 7 26 2 be 25 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product features ? near-zero propagation delay ?5 w switches connect inputs to outputs ? fast switching speed - 4ns max. ? permits hot insertion ? pin compatible with 74 series16245 ? operating vcc range: 3.0v to 3.6v ? industrial operating temperature: C40c to +85c ? packages available: C 48-pin 240 mil wide thin plastic tssop (a) C 48-pin 300 mil wide plastic ssop (v) pi3b16245 pi3b162245 (25 w w w w w ) 3.3v, hot insertion, 16-bit, 2-port busswitch logic block diagram product pin configuration product pin description pin name i/o description nbe i bus enable input (active low) na 0 -na 7 i/o bus a nb 0 -nb 7 i/o bus b function nbe na 0C7 disconnect h hi-z connect l nb 0C7 truth table (1) note: 1. h = high voltage level l = low voltage level hi-z = high impedance product description pericom semiconductors pi3b series of logic circuits are produced using the companys advanced 0.35 micron cmos technology. the pi3b16245 and pi3b162245 are 3.3 volt, hot-insertion, 16-bit, 2-port bus switches that are pin compatible with the 74 series 16245 16-bit transceiver. two enable signals (nbe) turn the switches on similar to the enable signals of the 16245. the bus switches create no additional propagational delay or additional ground bounce noise. the pi3b162245 device has a built-in 25-ohm series resistor to reduce noise resulting from reflections, thus eliminating the need for an external terminating resistor. 48-pin a, v 1 be 1 a 7 1 a 0 1 b 7 1 b 0 2 be 2 a 7 2 a 0 2 b 7 2 b 0
2 ps8189c 09/13/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b16245/pi3b162245 3.3v, hot insertion, 16-bit, 2-port busswitch capacitance (t a = 25c, f = 1 mhz) parameters (4) description test conditions typ units c in input capacitance v in = 0v 3.0 pf c off a/b capacitance, switch off v in = 0v 8.5 pf c on a/b capacitance, switch on v in = 0v 17.0 pf dc electrical characteristics (over the operating range, t a = C40c to +85c, v cc = 3.0v to 3.6v) 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 C0.5 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 v cc 1a v ik clamp diode voltage v cc = min., i in = C18ma C0.7 C1.2 v r on switch on resistance (3) v cc = min., v in = 0.0v, 16245 5 8 w i on = 48ma 162245 20 28 40 v cc = min., v in = 2.4v, 16245 10 15 w i on = 15ma 162245 20 35 48 storage temperature ....................................................... C65c to +150c ambient temperature with power applied ........................ C0c to +85c supply voltage range ........................................................ C0.5v to +4.6v dc input voltage ............................................................... C0.5v to +4.6v dc output current ......................................................................... 120 ma power dissipation ............................................................................... 0.5w 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. 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. 4. 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.) 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 con ditions above those indi- cated in the operational sections of this specification is not implied. exposure to absolute maximum ra ting condi- tions for extended periods may affect reliability.
3 ps8189c 09/13/99 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b16245/pi3b162245 3.3v, hot insertion, 16-bit, 2-port busswitch com. parameters description conditions (1) min. max. units t plh propagation delay (2,3) c l = 50pf 16245 0.25 t phl ax to bx, bx to ax r l = 500 w 162245 1.25 t pzh bus enable time c l = 50pf, r l = 500 w1 4.5 ns t pzl be to ax or bx t phz bus disable time c l = 50pf, r l = 500 w 1 5.0 t plz be to ax or bx pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 ? 1-800-435-2336 ? fax (408) 435-1100 ? http://www.pericom.com 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 10 a supply current d i cc supply current per v cc = max. v in = 3.0v (3) 750 a input @ ttl high i ccd supply current per v cc = max . 0.25 ma/ input per mhz (4) a and b pins open mhz be = 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 v cc = 3.3v, +25c ambient. 3. per ttl driven input (control inputs only); a and b pins do not contribute to i cc. 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. switching characteristics over 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. 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. t r a pe g a k c a p n i pe r u t a r e p m e t a 5 4 2 6 1 b 3 i p) 8 4 a ( p o s s t - 8 4c 5 8 + o t c 0 4 - v 5 4 2 6 1 b 3 i p) 8 4 v ( p o s s - 8 4c 5 8 + o t c 0 4 - ordering information
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