1 ps8335a 10/05/00 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b34x245 3.3v hot insertion 32-bit, 2-port bus switch product features ? fast switching speed - 4.5ns max. ? permits hot insertion ? near-zero propagation delay ? 5 ohm switches connect inputs to outputs ? direct bus connection when switches are on ? ultra-low quiescent power (1.0a typical) ? ideally suited for notebook applications ? industrial operating temperature: ?40c to +85c ? packages available: ? 80-pin, 150-mil wide plastic bqsop (b) ? ttl - compatible control of input levels logic block diagram product pin configuration product description pericom semiconductor?s pi3b series of logic circuits are produced in the company?s advanced submicron cmos technology. the pi3b34x245 is a 3.3v, 32-bit, 2-port bus switch. four enable signals (ben) turn the switches on. the bus switch creates no additional propagational delay or additional ground bounce noise. nc 1 2 3 4 5 6 7 8 9 gnd 10 11 12 13 14 15 16 17 18 19 20 gnd be1 80 79 78 77 76 75 v cc 74 73 72 71 70 69 68 67 66 65 64 63 62 b 15 61 a 0 a 1 a 2 a 3 a 4 a 5 a 6 a 7 nc a 8 a 9 a 10 a 11 a 12 a 13 a 14 a 15 b 14 b 13 b 12 b 11 b 10 b 9 b 8 be2 v cc b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 nc 21 22 23 24 25 26 27 28 29 gnd 30 31 32 33 34 35 36 37 38 39 40 gnd be3 60 59 58 57 56 55 v cc 54 53 52 51 50 49 48 47 46 45 44 43 42 b 31 41 a 16 a 17 a 18 a 19 a 20 a 21 a 22 a 23 nc a 24 a 25 a 26 a 27 a 28 a 29 a 30 a 31 b 30 b 29 b 28 b 27 b 26 b 25 b 24 be4 v cc b 16 b 17 b 18 b 19 b 20 b 21 b 22 b 23 80-pin b be 1 a 7 a 0 b 7 b 0 be 2 a 15 a 8 b 15 b 8 be 3 a 23 a 16 b 23 b 16 be 4 a 31 a 24 b 31 b 24
2 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b34x245 3.3v hot insertion 32-bit, 2-port busswitch ps8335a 10/05/00 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 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 3.5 pf c off a/b capacitance, switch off v in = 0v 8.0 pf c on a/b capacitance, switch on v in = 0v 16.0 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 = 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. 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 t s e t. n i m. p y t. x a ms t i n u v ih e g a t l o v h g i h t u p n il e v e l h g i h c i g o l d e e t n a r a u g0 . 2 ?? v v il e g a t l o v w o l t u p n il e v e l w o l c i g o l d e e t n a r a u g - 5 . 0 ? 8 . 0 i ih t n e r r u c h g i h t u p n iv c c v , . x a m = in =v c c ?? 1 a m i il t n e r r u c w o l t u p n iv c c v , . x a m = in d n g = ?? i ozh t n e r r u c t u p t u o e c n e d e p m i h g i h0 b , a v c c ?? v ik e g a t l o v e d o i d p m a l cv c c i , . n i m = nn = - a m 8 1 ??- 8 . 0 v r on e c n a t s i s e r n o h c t i w s v c c v , . n i m = in i , v 0 . 0 = on a m 8 4 = ? 58 w v c c v , . n i m = in i , v 4 . 2 = on a m 5 1 = ? 0 17 1 dc electrical characteristics (over the operating range, t a = ?40c to +85c, v cc = 3.3v 10%) maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) product pin description pin name i/o description ben i bus enable input (active low) a 0 -a 31 i/o bus a b 0 -b 31 i/o bus b function ben a0?31 disconnect h hi-z connect l b0?31 truth table (1) notes: 1. h = high voltage level l = low voltage level hi-z = high impedance
3 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b34x245 3.3v hot insertion 32-bit, 2-port busswitch ps8335a 10/05/00 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 input 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 specified frequency. the a and b inputs generate no significant ac or dc currents as they transition. this parameter is not tested, but is 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. 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 t s e t ) 1 ( . n i m. p y t ) 2 ( . x a ms t i n u i cc r e w o p t n e c s e i u q t n e r r u c y l p p u s v cc . x a m =v in v r o d n g = cc ? 0 . 10 1 m a i d cc r e p t n e r r u c y l p p u s h g i h l t t @ t u p n i v cc . x a m =v in =v 0 . 3 ) 3 ( ?? 0 5 7 power supply characteristics 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 ) 1 ( 5 4 2 x 4 3 b 3 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 ( x a o t x b , x b o t x a c l f p 0 5 = r l 0 0 5 = w ? 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 b x b r o x a o t e b c l f p 0 5 = r l 0 0 5 = w 0 0 5 = r w 0 . 10 . 4 t z h p t z l p e m i t e l b a s i d s u b x b r o x a o t e b 0 . 15 . 4
4 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b34x245 3.3v hot insertion 32-bit, 2-port busswitch ps8335a 10/05/00 pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 ? 1-800-435-2336 ? fax (408) 435-1100 ? http://www.pericom.com packaging mechanical: 80-pin bqsop 3.80 4.00 0.254 .0197 0.50 5? gauge plane .150 .157 x.xx x.xx denotes dimensions in millimeters .228 .244 5.80 6.20 .010 .063 .010 .016 0.254 0.406 0.803 0.811 20.40 20.60 .007 .010 0.17 0.27 40 80 x 45? 41 1 .019 1.60 .002 .009 0.05 0.25 .078 2.0 5? .019 .029 0.50 0.75 .008 nom 0.203 0.50 ref bsc max nom bsc ordering information e d o c g n i r e d r oe p y t e g a k c a p b 5 4 2 x 4 3 b 3 i pp o s q b c i t s a l p e d i w l i m - 0 5 1 , n i p - 0 8
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