1 ps8151f 05/07/01 product description pericom semiconductor?s pi3b series of logic circuits are produced using the company?s advanced submicron cmos technology, achieving industry leading performance. the pi3b3257 is a 3.3 volt, quad 2:1 multiplexer/demultiplexer with three-state outputs that is pinout and function compatible with the pi74fct257t, 74f257, and 74als/as/ls257. inputs can be connected to outputs with low on resistance (5 ohms) with no additional ground bounce noise or propagation delay. logic block diagram pi3b3257 3.3v, quad 2:1 mux/demux bus switch 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product features ? near zero propagation delay ? 5-ohm switches connect inputs to outputs ? fast switching speed: 4.8ns max. ? ultra-low quiescent power: 0.1a typical ? ideally suited for notebook applications ? pin compatible with 74 series 257 logic devices ? packages available: ? 16-pin 150 mil wide plastic qsop (q) ? 16-pin 150 mil wide plastic soic (w) ? 16-pin 173 mil wide plastic tssop (l) 16-pin product configuration product pin description truth table (1) note: 1. h = high voltage level l = low voltage level e ia 0 ia 1 ib 0 ib 1 ic 0 ic 1 id 0 id 1 s ya yb yc yd v cc s 1 e ia0 2 id0 ia1 3 id1 ya 4 yd ib0 5 16 ic0 ib1 6 15 ic1 yb 7 14 yc 8 13 12 gnd 11 10 9 16-pin q, w, l es a yb yc yd yn o i t c n u f hx z - i hz - i hz - i hz - i he l b a s i d ll 0 a i0 b i0 c i0 d i0 = s lh 1 a i1 b i1 c i1 d i1 = s e m a n n i pn o i t p i r c s e d n d i - n a is t u p n i a t a d ss t u p n i t c e l e s ee l b a n e d y - a ys t u p t u o a t a d d n gd n u o r g c c vr e w o p c nt c e n n o c o n
2 ps8151f 05/07/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b3257 3.3v, quad 2:1 mux/demux bus switch capacitance (t a = 25c, f = 1 mhz) dc electrical characteristics (over the operating range, t a = ?40c to +85c, v cc =3.3v 10%) 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 i and y pin at indicated current through the switch. on resistance is determined by the lower of the voltages on the two (i,y) pins. 4. this parameter is determined by device characterization but is not production tested. 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 +4.6v 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. 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 g0 . 2 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 i n y , n v c c 1 v k i e g a t l o v e d o i d p m a l cv c c i , . n i m = n i a m 8 1 ? =2 . 1 ?v r n o e c n a t s i s e r n o h c t i w s ) 3 ( v c c v , . n i m = n i i , v 0 . 0 = n o a m 4 6 r o a m 8 4 = v c c v , . n i m = n i i , v 4 . 2 = n o a m 5 1 = 5 0 1 8 7 1 w 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 tl a c i 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 iv n i v 0 =0 . 3 f p c n y f f o y n f f o h c t i w s , e c n a t i c a p a cv n i v 0 =0 . 7 1 c n i f f o i n f f o h c t i w s , e c n a t i c a p a cv n i v 0 =5 . 8 c n o i n y / n n o h c t i w s , e c n a t i c a p a cv n i v 0 =0 . 5 2
3 ps8151f 05/07/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b3257 3.3v, quad 2:1 mux/demux bus switch 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 ttl driven input (control inputs only); i and y 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 i and y 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 cap acitance. the switch?s time constant alone is of the order of 0.25ns for 50pf load. since this time constant is much smaller than the ri se/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 ) 1 ( 7 5 2 3 b 3 i p s t i n u . m o c . n i m. x a m t y i n y o t n i y a l e d n o i t a g a p o r p ) 3 , 2 ( c l f p 0 5 = r l 0 0 5 = w 5 2 . 0 s n t y s n y o t n s , e m i t t c e l e s s u b15 . 4 t h z p t l z p n y o t e , e m i t e l b a n e s u b15 . 4 t z h p t z l p n y o t e , e m i t e l b a s i d s u b18 . 4 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 mp y t ) 2 ( . x a ms t i n u i c c t n e r r u c y l p p u s r e w o p t n e c s e i u qv c c . x a m =v n i r o d n g =v c c 1 . 00 . 3 a d i c c h g i h l t t @ t u p n i r e p t n e r r u c y l p p u s ) 4 , 3 ( v c c . x a m =v n i =v 0 . 30 5 7
4 ps8151f 05/07/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b3257 3.3v, quad 2:1 mux/demux bus switch .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 detail a detail a .008 0.20 min. guage plane .010 0.254 .041 1.04 ref .016 .035 0.41 0.89 0?-6? .008 .013 0.20 0.33 seating plane .050 bsc 1 16 0-8? .149 .157 x.xx x.xx denotes dimensions in millimeters 3.78 3.99 .386 .393 9.80 10.00 1.27 .053 .068 1.35 1.75 .2284 .2440 5.80 6.20 .0040 .0098 0.10 0.25 .013 .020 .0155 .0260 0.330 0.508 0.393 0.660 .0075 .0098 0.25 0.50 .0099 .0196 x 45? 0.19 0.25 .016 .050 0.41 1.27 ref 16-pin qsop (q) package 16-pin soic (w) package
5 ps8151f 05/07/01 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pi3b3257 3.3v, quad 2:1 mux/demux 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 ph t d i w q 7 5 2 3 b 3 i p) q ( p o s q - 6 1l i m - 0 5 1 w 7 5 2 3 b 3 i p) w ( c i o s - 6 1l i m - 0 5 1 l 7 5 2 3 b 3 i p) l ( p o s s t - 6 1l i m - 3 7 1 ordering information .193 .201 .047 max. .002 .006 seating plane .0256 bsc .018 .030 .004 .008 .252 bsc 1 16 .169 .177 x.xx x.xx denotes controlling dimensions in millimeters 0.05 0.15 6.4 0.45 0.75 0.09 0.20 4.3 4.5 1.20 4.9 5.1 0.65 0.19 0.30 .007 .012 16-pin tssop (l) package
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