1/9 february 2003 n high speed: t pd = 4.5 ns (typ.) at v cc =5v n low power dissipation: i cc =8 m a (max.) at t a =25c n high noise immunity: v nih =v nil = 28% v cc (min.) n power down protection on inputs n symmetrical output impedance: |i oh |=i ol =24ma(min) n balanced propagation delays: t plh @ t phl n operating voltage range: v cc (opr) = 2v to 6v n pin and function compatible with 74 series 16244 n improved latch-up immunity description the 74ac16244 is an advanced high-speed cmos 16-bit bus buffer (3-state) fabricat- ed with sub-micron silicon gate and double-layer metal wiring c 2 mos tecnology. any ng output control governs four bus buffers. output enable inputs (ng )tied together give full 16 bit operation. when ng is low, the outputs are enabled. when ng is high, the output are in high impedance state. the device is designed to be used with 3-state memory address drivers, etc. 74ac16244 16-bit bus buffer with 3-state outputs (non inverted) order codes package tube t & r tssop 74AC16244TTR tssop pin connection
74ac16244 2/9 input and output equivalent circuit pin description truth table x : dont care z : high impedance iec logic symbols pin no symbol name and function 11g output enable input 2, 3, 5, 6 1y1 to 1y4 data outputs 8, 9, 11, 12 2y1 to 2y4 data outputs 13, 14, 16, 17 3y1 to 3y4 data outputs 19, 20, 22, 23 4y1 to 4y4 data outputs 24 4g output enable input 25 3g output enable input 30, 29, 27, 26 4a1 to 4a4 data outputs 36, 35, 33, 32 3a1 to 3a4 data outputs 41, 40, 38, 37 2a1 to 2a4 data outputs 47, 46, 44, 43 1a1 to 1a4 data outputs 48 2g output enable input 4, 10, 15, 21, 28, 34, 39, 45 gnd ground (0v) 7, 18, 31, 42 v cc positive supply voltage inputs output g an yn lll lhh hxz
74ac16244 3/9 absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied recommended operating conditions 1) v in from 30% to 70% of v cc symbol parameter value unit v cc supply voltage -0.5 to +7.0 v v i dc input voltage -0.5 to +7.0 v v o dc output voltage -0.5 to v cc + 0.5 v i ik dc input diode current 20 ma i ok dc output diode current 50 ma i o dc output current 50 ma i cc or i gnd dc v cc or ground current 400 ma t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c symbol parameter value unit v cc supply voltage 2to6 v v i input voltage 0 to v cc v v o output voltage 0 to v cc v t op operating temperature -55 to 125 c dt/dv input rise and fall time (note 1) v cc = 3.0, 4.5 or 5.5 0 to 8 ns/v
74ac16244 4/9 dc specifications ac electrical characteristics (c l =50pf,r l = 500 w , input t r =t f = 3n) (*) voltage range is 3.3v 0.3v (**) voltage range is 5.0v 0.5v symbol parameter test condition value unit v cc (v) t a =25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. v ih high level input voltage 3.0 v o = 0.1 v or v cc -0.1v 2.1 1.5 2.1 2.1 v 4.5 3.15 2.25 3.15 3.15 5.5 3.85 2.75 3.85 3.85 v il low level input voltage 3.0 v o = 0.1 v or v cc -0.1v 1.5 0.9 0.9 0.9 v 4.5 2.25 1.35 1.35 1.35 5.5 2.75 1.65 1.65 1.65 v oh high level output voltage 3.0 i o =-50 m a 2.9 2.99 2.9 2.9 v 4.5 i o =-50 m a 4.4 4.49 4.4 4.4 5.5 i o =-50 m a 5.4 5.49 5.4 5.4 3.0 i o =-12 ma 2.56 2.46 2.46 4.5 i o =-24 ma 3.86 3.76 3.76 5.5 i o =-24 ma 4.86 4.76 4.76 v ol low level output voltage 3.0 i o =50 m a 0.002 0.1 0.1 0.1 v 4.5 i o =50 m a 0.001 0.1 0.1 0.1 5.5 i o =50 m a 0.001 0.1 0.1 0.1 3.0 i o =12 ma 0.36 0.44 0.44 4.5 i o =24 ma 0.36 0.44 0.44 i i input leakage current 5.5 v i =v cc or gnd 0.1 1 1 m a i oz high impedance output leakage current 5.5 v i =v ih or v il v o =v cc or gnd 0.5 5 5 m a i cc quiescent supply current 5.5 v i =v cc or gnd 88080 m a symbol parameter test condition value unit v cc (v) c l (pf) t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. t plh t phl propagation delay time atoy 3.3 (*) 6 8.5 11.5 11.5 ns 5.0 (**) 4.5 7.0 9.0 9.0 t pzl t pzh output enable time 3.3 (*) 8 10.5 14.0 14.0 ns 5.0 (**) 5.5 8.0 10.0 10.0 t plz t phz output disable time 3.3 (*) 7.3 9.0 11.5 11.5 ns 5.0 (**) 5.5 8.0 14.0 14.0
74ac16244 5/9 capacitive characteristics 1) c pd is defined as the value of the ics internal equivalent capacitance which is calculated from the operating current consumption without load. (refer to test circuit). average operating current can be obtained by the following equation. i cc(opr) =c pd xv cc xf in +i cc /16(per latch) test circuit c l = 50 pf or equivalent (includes jig and probe capacitance) r l =r1=500 w or equivalent r t =z out of pulse generator (typically 50 w ) symbol parameter test condition value unit v cc (v) t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. c in input capacitance 710 10 10pf c out output capacitance 14 pf c pd power dissipation capacitance (note 1) 5.0 f in = 10mhz 25 pf test switch t plh ,t phl open t pzl ,t plz v cc t pzh ,t phz gnd
74ac16244 6/9 waveform 1: propagation delays (f=1mhz; 50% duty cycle) waveform 2: output enable and disable time (f=1mhz; 50% duty cycle)
74ac16244 7/9 dim. mm. inch min. typ max. min. typ. max. a 1.2 0.047 a1 0.05 0.15 0.002 0.006 a2 0.9 0.035 b 0.17 0.27 0.0067 0.011 c 0.09 0.20 0.0035 0.0079 d 12.4 12.6 0.488 0.496 e 8.1 bsc 0.318 bsc e1 6.0 6.2 0.236 0.244 e 0.5 bsc 0.0197 bsc k0? 8?0? 8? l 0.50 0.75 0.020 0.030 tssop48 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 7065588c
74ac16244 8/9 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 30.4 1.197 ao 8.7 8.9 0.343 0.350 bo 13.1 13.3 0.516 0.524 ko 1.5 1.7 0.059 0.067 po 3.9 4.1 0.153 0.161 p 11.9 12.1 0.468 0.476 tape & reel tssop48 mechanical data
74ac16244 9/9 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco singapore - spain - sweden - switzerland - united kingdom - united states. ? http://www.st.com
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