1 ps8309 07/30/98 product description pericom semiconductor?s pi74alvch series of logic circuits are produced in the company?s advanced 0.5 micron cmos technology, achieving industry leading speed. the PI74ALVCHT16244 is a 16-bit buffer/driver designed for 2.3v to 3.6v v cc operation. the buffer/driver is designed specifically to improve both the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. the device can be used as four 4-bit buffers, two 8-bit buffers, or one 16-bit buffer. it provides true outputs and symmetrical active-low output-enable (oe) inputs. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. the PI74ALVCHT16244 has ?bus hold? which retains the data input?s last state whenever the data input goes to high-impedance preventing ?floating? inputs and eliminating the need for pullup/ down resistors. the PI74ALVCHT16244 can be driven from either 3.3v or 5.0v devices allowing this device to be used as a translator in a mixed 3.3/5.0v system. 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product features PI74ALVCHT16244 is designed for low voltage operation v cc = 2.3v to 3.6v 5v i/o tolerant hysteresis on all inputs typical v olp (output ground bounce) < 0.8v at v cc = 3.3v, t a = 25c typical v ohv (output v oh undershoot) < 2.0v at v cc = 3.3v, t a = 25c bus hold retains last active bus state during 3-state eliminates the need for external pullup resistors industrial operation at ?40c to +85c packages available: ? 48-pin 240 mil wide plastic tssop (a) ? 48-pin 300 mil wide plastic ssop (v) PI74ALVCHT16244 16-bit buffer/driver with 3-state outputs logic block diagram 1 oe 1 a 11 y 1 1 a 21 y 2 1 a 31 y 3 1 a 41 y 4 3 oe 3 a 13 y 1 3 a 23 y 2 3 a 33 y 3 3 a 43 y 4 2 oe 2 a 12 y 1 2 a 22 y 2 2 a 32 y 3 2 a 42 y 4 4 oe 4 a 14 y 1 4 a 24 y 2 4 a 34 y 3 4 a 44 y 4 43 44 46 47 1 37 38 40 41 48 12 11 9 8 6 5 3 2 32 33 35 36 25 17 16 14 13 26 27 29 30 24 23 22 20 19
2 ps8309 07/30/98 PI74ALVCHT16244 16-bit buffer driver with 3-state o utputs 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pin name description noe 3-state output enable inputs (active low) nax inputs nyx 3-state outputs gnd ground v cc power product pin description truth table (1) notes: 1. h = high signal level l = low signal level x = dont care or irrelevant z = high impedance product pin configuration 1oe 1y1 1y2 gnd 1y3 1y4 vcc 2y1 2y2 gnd 2y3 2y4 3y1 3y2 gnd 3y3 3y4 vcc 4y1 4y2 gnd 4y3 4y4 4oe s t u p n is t u p t u o e o na n x x y n lh h ll l hx z 1 2 3 4 5 6 7 8 9 48 10 47 11 46 12 45 13 44 14 43 15 42 16 41 17 40 18 39 19 38 20 37 21 36 22 35 23 34 24 33 32 31 30 29 28 27 26 25 2oe 1a1 1a2 gnd 1a3 1a4 vcc 2a1 2a2 gnd 2a3 2a4 3a1 3a2 gnd 3a3 3a4 vcc 4a1 4a2 gnd 4a3 4a4 3oe 48-pin v48 a48 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. storage temperature .............................................. ?65c to +150c ambient temperature with power applied ........... ?40c to +85c input voltage range, v in ........................................... ?0.5v to +6.0v output voltage range, v out .................................... ?0.5v to +6.0v dc input voltage ....................................................... ?0.5v to +6.0v dc output current ................................................................. 50 ma power dissipation ..................................................................... 1.0w maximum ratings (above which the useful life may be impaired. for user guide- lines, not tested.)
3 ps8309 07/30/98 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 PI74ALVCHT16244 16-bit buffer driver with 3-state o utputs notes: 1. for max. or min.conditions, use appropriate value specified under electrical characteristics for the applicable device type. 2. typical values are at vcc = 3.3v, +25c ambient and maximum loading. 3. unused control inputs must be held high or low to prevent them from floating. dc electrical characteristics (over the operating range, t a = C40c to +85c, v cc = 3.3v 10%) 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 cc e g a t l o v y l p p u s3 . 26 . 3v v ih ) 3 ( e g a t l o v h g i h t u p n i v cc v 7 . 2 o t v 3 . 2 =7 . 15 . 5v v cc v 6 . 3 o t v 7 . 2 =0 . 25 . 5v v il ) 3 ( e g a t l o v w o l t u p n i v cc v 7 . 2 o t v 3 . 2 =7 . 0v v cc v 6 . 3 o t v 7 . 2 =8 . 0v v in ) 3 ( e g a t l o v t u p n i05 . 5v v out ) 3 ( e g a t l o v t u p t u o05 . 5v v oh t u p t u o h g i h e g a t l o v i oh 0 0 1 - = m v , a cc =. x a m o t . n i mv cc 2 . 0 - v v ih i , v 7 . 1 = oh 6 - =v , a m cc =v 3 . 20 . 2 v ih i , v 7 . 1 = oh 2 1 - =v , a m cc =v 3 . 27 . 1 v ih i , v 0 . 2 = oh 2 1 - =v , a m cc =v 7 . 22 . 2 v ih i , v 0 . 2 = oh 2 1 - =v , a m cc =v 0 . 34 . 2 v ih i , v 0 . 2 = oh 4 2 - =v , a m cc =v 0 . 30 . 2 v ol t u p t u o w o l e g a t l o v i ol 0 0 1 = m v , a il =. x a m o t . n i m2 . 0 v v il i , v 7 . 0 = ol 6 =v , a m cc =v 3 . 24 . 0 v il i , v 7 . 0 = ol 2 1 =v , a m cc =v 3 . 27 . 0 v il i , v 8 . 0 = ol 2 1 =v , a m cc =v 7 . 24 . 0 v il i , v 8 . 0 = ol 4 2 =v , a m cc =v 0 . 35 5 . 0 i oh ) 3 ( t u p t u o h g i h t n e r r u c v cc v 3 . 2 =2 1 - a m v cc v 7 . 2 =2 1 - v cc v 0 . 3 =4 2 - i ol ) 3 ( t u p t u o w o l t n e r r u c v cc v 3 . 2 =2 1 a m v cc v 7 . 2 =2 1 v cc v 0 . 3 =4 2 i in t n e r r u c t u p n iv in v = cc v , d n g r o cc v 6 . 3 =5 m a i in ( hold ) t u p n i d l o h t n e r r u c v in v , v 8 . 0 = cc v 0 . 3 =5 7 v in v , v 0 . 2 = cc v 0 . 3 =5 7 - v in 0 =o tv , v 6 . 3 cc v 6 . 3 =0 0 5 i oz t n e r r u c t u p t u o ) s t u p t u o e t a t s - 3 ( v out v 5 . 5 =r o, d n gv cc v 6 . 3 =0 1 m a c c it n e r r u c y l p p u s v cc =v 6 . 3i , out 0 = m , a v in v r o d n g = cc 0 4 m a d c c i 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 v 0 . 3 =o t6 . 3v v t a t u p n i e n o cc -v 6 . 0 v t a s t u p n i r e h t o cc d n g r o 0 5 7 m a c i s t u p n i l o r t n o c v in v = cc v , d n g r o cc v 3 . 3 = 3 f p s t u p n i a t a d 6 c o s t u p t u ov o v = cc v , d n g r o cc v 3 . 3 =7f p
4 ps8309 07/30/98 PI74ALVCHT16244 16-bit buffer driver with 3-state o utputs 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 s r e t e m a r a p m o r f ) t u p n i ( o t ) t u p t u o ( v c c v 2 . 0 v 5 . 2 =v c c v 7 . 2 =v c c v 3 . 0 v 3 . 3 = s t i n u . n i m ) 2 ( . x a m . n i m ) 2 ( . x a m . n i m ) 2 ( . x a m t d p ay 0 . 10 . 50 . 40 . 16 . 3 s n t n e e oy 0 . 18 . 60 . 60 . 10 . 5 t s i d e oy 0 . 10 . 62 . 50 . 10 . 5 n o i t p i r c s e d d / t d v ) 3 ( r o e s i r n o i t i s n a r t t u p n i l l a f 00 100 100 1v / s n switching characteristics over operating range (1) pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 ? 1-800-435-2336 ? fax (408) 435-1100 ? http://www.pericom.com operating characteristics, t a = 25 o c notes: 1. see test circuit and wave forms. 2. minimum limits are guaranteed but not tested on propagation delays. 3. recommended operating condition. s r e t e m a r a p t s e t s n o i t i d n o c v c c v 2 . 0 v 5 . 2 =v c c v 3 . 0 v 3 . 3 = s t i n u l a c i p y tl a c i p y t c d p n o i t a p i s s i d r e w o p e c n a t i c a p a c d e l b a n e s t u p t u o c l f p 0 5 = z h m 0 1 = f 6 19 1 f p d e l b a s i d s t u p t u o45
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