1/9 february 2003 n high speed: t pd = 4.5 ns (typ.) at v cc =5v n low power dissipation: i cc =4 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 16245 n improved latch-up immunity description the 74ac16245 is an advanced high-speed cmos 16-bit bus transceiver (3-state) fabricated with sub-micron silicon gate and dou- ble-layer metal wiring c 2 mos tecnology. this ic is intended for two-way asynchronous communication between data busses; the direction of data transmission is determined by dir input. the enable input g canbeusedto disable the device so that the busses are effectively isolated. all inputs and outputs are equipped with protec- tion circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. all floating bus terminals during high z state must be held high or low. 74ac16245 16-bit bus transceiver with 3-state outputs (non inverted) order codes package tube t & r tssop 74AC16245TTR tssop pin connection
74ac16245 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 1 1dir directional control 2, 3, 5, 6, 8, 9, 11, 12 1b1 to 1b8 data inputs/outputs 13, 14, 16, 17, 19, 20, 22, 23 2b1 to 2b8 data inputs/outputs 24 2dir directional control 25 2g output enable input 36, 35, 33, 32, 30, 29, 27, 26 2a1 to 2a8 data inputs/outputs 47, 46, 44, 43, 41, 40, 38, 38 1a1 to 1a8 data inputs/outputs 48 1g output enable input 4, 10, 15, 21, 28, 34, 39, 45 gnd ground (0v) 7, 18, 31, 42 v cc positive supply voltage inputs function output g dir a bus b bus yn l l output input a = b l h input output b = a hxzzz
74ac16245 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 20 ma i o dc output current 25 ma i cc or i gnd dc v cc or ground current 200 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
74ac16245 4/9 dc specifications ac electrical characteristics (c l =50pf,r l = 500 w , input t r =t f = 3ns) (*) 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 44040 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 3.3 (*) 6 6.3 8.5 9.0 ns 5.0 (**) 4.5 5.0 6.5 7.5 t pzl t pzh output enable time 3.3 (*) 8 8.5 11.0 12.0 ns 5.0 (**) 5.5 6.0 7.0 8.0 t plz t phz output disable time 3.3 (*) 7.5 8.0 9.3 10.0 ns 5.0 (**) 5.7 6.0 7.0 8.0
74ac16245 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=1k 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 i/o input 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 2v cc t pzh ,t phz gnd
74ac16245 6/9 waveform 1: propagation delays (f=1mhz; 50% duty cycle) waveform 2: output enable and disable time (f=1mhz; 50% duty cycle)
74ac16245 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
74ac16245 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
74ac16245 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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