1/9 february 2003 n high speed: t pd = 4.8ns (typ.) at v cc =5v n low power dissipation: i cc =8 m a(max.) at t a =25c n compatible with ttl outputs v ih =2v(min.),v il = 0.8v (max.) n 50 w transmission line driving capability n symmetrical output impedance: |i oh |=i ol = 24ma (min) n operating voltage range: v cc (opr) = 4.5v to 5.5v n improved latch-up immunity description the 74act16541 is an advanced high-speed cmos 16-bit bus buffer (3-state) fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos tecnology. this is composed of two 8-bit sections with separate output-enable signals. for either 8-bit buffers section, the 3 state control gate operates as a two input and such that if either ng1 and ng2 are high, all outputs are in the high impedence state. this device is designed to interface directly high speed cmos systems with ttl and nmos components. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74act16541 16-bit bus buffer with 3-state outputs (non inverted) order codes package tube t & r tssop 74ACT16541TTR tssop pin connection
74act16541 2/9 input and output equivalent circuit pin description truth table x : dont care" z : high impedance iec logic symbols pin no symbol name qnd function 1, 48 1g1 , 1g2 output enable inputs 2, 3, 5, 6, 8, 9, 11, 12 1y1 to 1y8 data outputs 13, 14, 16, 17, 19, 20, 22, 23 2y1 to 2y8 data outputs 24, 25 2g1 , 2g2 output enable inputs 36, 35, 33, 32, 30, 29, 27, 26 2a1 to 2a8 data outputs 47, 46, 44, 43, 41, 40, 38, 37 1a1 to 1a8 data outputs 4, 10, 15, 21, 28, 34, 39, 45 gnd ground (0v) 7, 18, 31, 42 v cc positive supply voltage inputs output g1 g2 an yn hxxz xhxz llhh llll
74act16541 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 0.8v to 2.0v symbol parameter value unit v cc supply voltage -0.5 to +7 v v i dc input voltage -0.5 to v cc + 0.5 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 20 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 4.5 to 5.5 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 v cc = 4.5 to 5.5v (note 1) 8 ns/v
74act16541 4/9 dc specifications 1) maximum test duration 2ms, one output loaded at time 2) incident wave switching is guaranteed on transmission lines with impedances as low as 50 w ac electrical characteristics (c l =50pf,r l = 500 w , input t r =t f =3ns) (*) 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 4.5 v o = 0.1 v or v cc -0.1v 2.0 1.5 2.0 2.0 v 5.5 2.0 1.5 2.0 2.0 v il low level input voltage 4.5 v o = 0.1 v or v cc -0.1v 1.5 0.8 0.8 0.8 5.5 1.5 0.8 0.8 0.8 v v oh high level output voltage 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 4.5 i o =-24 ma 3.86 3.76 3.7 v 5.5 i o =-24 ma 4.86 4.76 4.7 v ol low level output voltage 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 4.5 i o =24 ma 0.36 0.44 0.5 5.5 i o =24 ma 0.36 0.44 0.5 i i input leakage cur- rent 5.5 v i =v cc or gnd 0.1 1 1 m a i oz high impedance output leakege current 5.5 v i =v ih or v il v o =v cc or gnd 0.5 5 5 m a i cct max i cc /input 5.5 v i =v cc - 2.1v 0.6 1.5 1.6 ma i cc quiescent supply current 5.5 v i =v cc or gnd 88080 m a i old dynamic output current (note 1, 2) 5.5 v old = 1.65 v max 75 50 ma i ohd v ohd = 3.85 v min -75 -50 ma 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. t plh propagation delay time 5.0 (*) 3.1 4.6 9 9 ns t phl 4.8 6.8 9.2 9.2 t pzl output enable time 5.0 (*) 6.5 9.2 11.0 11.0 ns t pzh 5.7 8.0 10.0 10.0 t plz output disable time 5.0 (*) 6.0 7.9 10.7 10.7 ns t phz 5.3 6.8 9.7 9.7
74act16541 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 circuit) test circuit c l = 50pf or equivalent (includes jig and probe capacitance) r l =r 1 =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 5.0 3.7 pf c out output capaci- tance 5.0 13 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 2v cc t pzh, t phz gnd
74act16541 6/9 waveform 1: propagation delays (f=1mhz; 50% duty cycle) waveform 2: output enable and disable times (f=1mhz; 50% duty cycle)
74act16541 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
74act16541 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
74act16541 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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