1 ps8531 03/19/01 v cc nc 1 80 be1 a0 2 79 b0 a1 3 78 b1 a2 4 77 b2 a3 5 76 b3 a4 6 75 b4 a5 7 74 b5 a6 8 73 b6 a7 9 72 b7 gnd 10 71 v cc a8 11 70 be2 a9 12 69 b8 13 68 b9 a10 nc 14 67 b10 a11 15 66 b11 a12 16 65 b12 a13 17 64 b13 a14 18 63 b14 a15 19 62 b15 gnd 20 61 v cc nc 21 60 be3 a16 22 59 b16 a17 23 58 b17 a18 24 57 b18 a19 25 56 b19 a20 26 55 b20 a21 27 54 b21 a22 28 53 b22 a23 29 52 b23 gnd 30 51 v cc a24 31 50 be4 a25 32 49 b24 33 48 b25 a26 nc 34 47 b26 a27 35 46 b27 a28 36 45 b28 a29 37 44 b29 a30 38 43 b30 a31 39 42 b31 gnd 40 41 product description pericom semiconductor?s pi3vt series of logic circuits are produced using the company?s advanced submicron cmos technology, achieving industry leading performance. the pi3vt34x245, is a 2.5v or 3.3v 8-bit, 2-port bus switch, is designed with a low on resistance (5 ohms). the switches are turned on or enabled by the bus enable (ben) input signal. given a 3.3v supply and an input voltage of 3.3v, the switch translates to an output voltage of 2.5v. similarly, when operated with a 2.5v supply and given 2.5v inputs, the device translates the outputs to 1.8v. logic block diagram product pin configuration product features ? near zero propagation delay ? low on resistance switches connect inputs to outputs ? 2.5v supply voltage operation ? 2.5v or 1.8v switching ? packages available: ? 80-pin, 150 mil wide plastic bqsop (b) applications ? 3.3v to 2.5v level shifting (voltage translation) ? 2.5v to 1.8v level shifting (voltage translation) 80-pin b pi3vt34x245 32-bit, 2-port, low voltage translator bus switch 1 2345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012 12345678901 2 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 be1 a7 a0 b7 b0 be2 a15 a8 b15 b8 be3 a23 a16 b23 b16 be4 a31 a24 b31 b24
2 ps8531 03/19/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3vt34x245 32-bit, 2-port, low voltage translator bus switch storage temperature ........................................................ ?65c to +150c ambient temperature with power applied ......................... ?40c to +85c supply voltage to ground potential ......................................... ?0.5v to +4.6v dc input voltage .................................................................. ?0.5v to +5.5v 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 specifica- tion is not implied. exposure to absolute maximum rating conditions for extended periods may affect reli- ability. maximum ratings (above which the useful life may be impaired. for user guidelines, not 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 ) 1 ( . n i m. p y t ) 2 ( . x a ms t i n u v h i 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 g8 . 1v c c v 3 . 0 + v v l i 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 g5 . 0 ?8 . 0 i h i t n e r r u c h g i h t u p n iv c c v , . x a m = n i v = c c 1 a i l i t n e r r u c w o l t u p n iv c c v , . x a m = n i d n g =1 i h z o t n e r r u c t u p t u o e c n a d e p m i h g i h0 b , a v c c 1 r n o 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 = n i i , v 0 . 0 = n o a m 8 =58 w v c c v , . n i m = n i i , v 7 . 1 = n o a m 8 =0 12 2 v c c v , v 3 . 2 = n i i , v 0 . 0 = n o a m 8 =69 v c c v , v 3 . 2 = n i i , v 3 . 1 = n o a m 8 =5 20 3 v p e g a t l o v s s a p v n i v = c c i , v 3 . 3 = t u o a 5 ? =3 . 25 . 29 . 2 v v n i v = c c i , v 5 . 2 = t u o a 5 ? =8 . 1 dc electrical characteristics (over operating range, t a = ?40c to +85c, v cc = 3.3v 10%) function be n 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 e m a n n i po / in o i t p i r c s e d e b n i) w o l e v i t c a ( t u p n i e l b a n e s u b 1 3 a - 0 ao / ia s u b 1 3 b - 0 bo / ib s u b product pin description
pi3vt34x245 32-bit, 2-port, low voltage translator bus switch 3 ps8531 03/19/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 power supply characteristics 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 driven input (control input only); a and b pins do not contribute to d i cc . switching characteristics over 3.3v 0.3v operating range capacitance (t a = 25c, f = 1 mhz) 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 p ) 5 ( n o i t p i r c s e ds n o i t i d n o c t s e t. p y ts t i n u c n i e c n a t i c a p a c t u p n i v n i v 0 = 5 . 3 f p c f f o f f o h c t i w s , e c n a t i c a p a c b / a 0 . 5 c n o n o h c t i w s , e c n a t i c a p a c b / a 0 . 0 1 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 c c 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 c c . x a m = v n i v r o d n g = c c 2 1 a d i c c r e p t n e r r u c y l p p u s h g i h t u p n i v n i= v 3 ) 3 ( 0 5 r e t e m a r a ps n o i t i d n o c t s e ts n o i t i d n o c ) 1 ( . m o c s t i n u . 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 b o t x a , c l f p 0 5 = r l s m h o 0 0 5 = ?5 2 . 0 s n t h z p t l z p x b r o x a o t e b ; e m i t e l b a n e s u b c l f p 0 5 = r l s m h o 0 0 5 = s m h o 0 0 5 = r 5 . 15 . 6 t z h p t z l p x b r o x a o t e b ; e m i t e l b a s i d s u b5 . 15 . 5
4 ps8531 03/19/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3vt34x245 32-bit, 2-port, low voltage translator bus switch pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 ? 1-800-435-2336 ? fax (408) 435-1100 ? http://www.pericom.com t r a pe g a k c a p - n i pe r u t a r e p m e t b 5 4 2 x 4 3 t v 3 i p) b ( p o s q b - 0 8c o 5 8 + o t c o 0 4 ? ordering information 80-pin bqsop package (q) 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 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 cap acitance. 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 t he 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 dri ven side. switching characteristics over 2.5v 0.2v operating range r e t e m a r a ps n o i t i d n o c t s e ts n o i t i d n o c ) 1 ( . m o c s t i n u . 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 b o t x a , c l f p 0 5 = r l s m h o 0 0 5 = ?5 2 . 0 s n t h z p t l z p x b r o x a o t e b ; e m i t e l b a n e s u b c l f p 0 5 = r l s m h o 0 0 5 = s m h o 0 0 5 = r 5 . 18 . 9 t z h p t z l p x b r o x a o t e b ; e m i t e l b a s i d s u b5 . 18 . 9
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