1 ps8512 03/14/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 4-bit busswitch with ?2v undershoot protection product description pericom semiconductor?s pi5c series of logic circuits are produced using the company?s advanced submicron cmos technology, achieving industry leading performance. the pi5c3125c and PI5C3126C are 5v, 4-bit, 2-port bus switches. they are intended for pci hot-plug applications. industry leading advantages include a propagation delay of 250ps, resulting from its 5-ohm channel resistance and low i/o capacitance. the a-ports switch data to b outputs and are bidirectional. the pi5c3125c device has active low enables, and the PI5C3126C has active high enables. the a-port can handle up to ?2v undershoot when the switch is disabled. product features ?r on is 5ohm typical ? undershoot protection on a port only: ?2v ? direct bus connection when switches are on ? industrial operation temperature: ?40c to +85c ? near zero propagation delay ? low channel on capacitance: 14pf max. ? packages available: ? 14-pin 173 mil wide plastic tssop (l) ? 14-pin 150 mil wide plastic soic (w) ? 16-pin 150 mil wide plastic qsop (q) pi5c3125c logic block diagram PI5C3126C logic block diagram be0 a0 b0 be1 a1 b1 be2 a2 b2 be3 a3 b3 be0 a0 b0 be1 a1 b1 be2 a2 b2 be3 a3 b3 pi5c3125c PI5C3126C applications ? pci hot plugging for live insertion ? memory bank sharing
2 ps8512 03/14/01 pi5c3125c/3126c 4-bit bus switch with ?2v undershoot protection 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi5c3125c PI5C3126C ben ben an bn v cc function x* x hi-z hi-z gnd disconnect h l hi-z hi-z v cc disconnect lhbnanv cc connect pi5c3125 14-pin configuration pi5c3126 14-pin configuration pi5c3125 16-pin configuration pi5c3126 16-pin configuration product pin description pin name description ben switch enable (pi5c3125c) ben switch enable (PI5C3126C) a3-a0 bus a b3-b0 bus b v cc power gnd ground truth table (1) notes: 1. h = high voltage level, l = low voltage level hi-z = high impedance, x = don?t care * a pull-up resistor should be provided for power-up protection. storage temperature ........................................................... ?65c to +150c ambient temperature with power applied ............................ ?40c to + 85c supply voltage to ground potential (inputs & v cc 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 ............................................................................ 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 spe cifica- tion is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) 14-pin l,w 1 2 3 4 5 6 7 14 13 12 11 10 9 8 vcc be3 a3 b3 be2 a2 b2 be0 a0 b0 be1 a1 b1 gnd 1 2 3 4 5 6 7 14 13 12 11 10 9 8 vcc be3 a3 b3 be2 a2 b2 be0 a0 b0 be1 a1 b1 gnd 14-pin l,w 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 vcc be3 a3 b3 be2 a2 b2 nc nc be0 a0 b0 be1 a1 b1 gnd 16-pin q 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 vcc be3 a3 b3 be2 a2 b2 nc nc be0 a0 b0 be1 a1 b1 gnd 16-pin q
pi5c3125c/3126c 4-bit bus switch with ?2v undershoot protection 3 ps8512 03/14/01 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 100 a supply current d i cc supply current per v cc = max. v in = 3.4v (3) 2.5 ma input @ ttl high dc electrical characteristics (over the operating range, t a = ?40c 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 v v il input low voltage guaranteed logic low level ?0.5 0.8 v i ih input high current v cc = max., v in = v cc 1 a 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 a v ik clamp diode voltage v cc = min., i in = ?18ma ?1.8 v v up undershoot protection voltage (3) max inputs, undershoot pulse ?2.0 v duration <25ns r on switch on resistance (4) v cc = min., v in = 0.0v, i on = 48ma 5 7 ohm v cc = min., v in = 2.4v, i on = 15ma 10 15 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 = 5.0v, +25c ambient. 3. per ttl driven input (v in = 3.4v, 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 is guarantee d by design. 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 v cc = 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.
4 ps8512 03/14/01 pi5c3125c/3126c 4-bit bus switch with ?2v undershoot protection 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi5c3125c switching characteristics over operating range 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 0.25ns 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 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 interaction with the load on the driven side. s r e t e m a r a pn o i t p i r c s e ds n o i t i d n o c c 5 2 1 3 c 5 i p s t i n u m o c . n i m. x a m t h l p t l h p y a l e d n o i t a g a p o r p ) 3 , 2 ( a o t b , b o t a c l f p 0 5 = r l m h o 0 0 5 = 5 2 . 0 s n t h z p t l z p e m i t e l b a n e s u b5 . 06 . 6 t z h p t z l p e m i t e l b a s i d s u b5 . 00 . 6 PI5C3126C switching characteristics over operating range s r e t e m a r a pn o i t p i r c s e ds n o i t i d n o c c 6 2 1 3 c 5 i p s t i n u m o c . n i m. x a m t h l p t l h p y a l e d n o i t a g a p o r p ) 3 , 2 ( a o t b , b o t a c l f p 0 5 = r l m h o 0 0 5 = 5 2 . 0 s n t h z p t l z p e m i t e l b a n e s u b5 . 06 . 6 t z h p t z l p e m i t e l b a s i d s u b5 . 00 . 6 applications information logic inputs the logic control inputs can be driven up to +5.5v regardless of the supply voltage. for example, given a +5.0v supply, be, maybe driven low to 0v and high to 5.5v. driving be rail-to-rail a minimizes power consumption. power-supply sequencing proper power-supply sequencing is recommended for all cmos devices. always apply vcc before applying signals to the input/ output or control pins. a rail-to-rail is a registered trademark of nippon motorola, ltd.
pi5c3125c/3126c 4-bit bus switch with ?2v undershoot protection 5 ps8512 03/14/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 .189 .197 .053 .069 .004 .010 seating plane .025 bsc .007 .010 .228 .244 1 16 .150 .157 .016 .050 x.xx x.xx denotes dimensions in millimeters 0.635 4.80 5.00 1.35 1.75 5.79 6.19 0.101 0.254 .008 .012 0.203 0.305 3.81 3.99 0.178 0.254 0.38 0.41 1.27 .008 0.203 .015 x 45 ref seating plane .050 bsc 1 14 x 45? 0-8? .149 .157 x.xx x.xx denotes dimensions in millimeters 3.78 3.99 .336 .344 8.55 8.75 .0155 .026 0.393 0.660 1.27 .053 .068 1.35 1.75 .2284 .2440 5.80 6.20 .013 .020 0.330 0.508 .0040 .0098 0.10 0.25 .0099 .0196 0.25 0.50 .0075 .0098 0.19 0.25 .016 .050 0.41 1.27 ref 14-pin soic (w) 16-pin qsop (q)
6 ps8512 03/14/01 pi5c3125c/3126c 4-bit bus switch with ?2v undershoot protection 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 14-pin tssop (l) 0.193 0.201 0.047 0.002 0.006 seating plane 0.0256 typical 0.018 0.030 0.004 0.008 0.240 0.264 1 14 0.169 0.177 x.xx x.xx denotes dimensions in millimeters 0.05 0.15 6.1 6.7 0.45 0.75 0.09 0.20 4.3 4.5 1.20 max. 4.90 5.10 0.65 0.19 0.30 0.007 0.012 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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