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1/12 july 2001 n high speed : t pd = 8ns (max.) at t a =25c v cca = 3.3v, v ccb = 5.0v n low power dissipation: i cca = i ccb = 5 m a(max.) at t a =25c n low noise: v olp =0.3v (typ.) at v cca =3.3v n symmetrical output impedance: |i oh | = i ol = 24ma (min) n balanced propagation delays: t plh @ t phl n operating voltage range: v cca (opr) = 2.7v to 3.6v (1.2v data retention) v ccb (opr) = 2.7v to 5.5v (1.2v data retention) pin and function compatible with 74 series c3245 n improved latch-up immunity description the 74lvxc3245 is a dual supply 8 bit configurable low voltage cmos octal bus transceiver fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos technology. designed for use as an interface between a 3.3v bus and a 3.3v to 5v bus in a mixed 3.3v/5v supply systems, it achieves high speed operation while maintaining the cmos low power dissipation. this ic is intended for two-way asynchronous communication between data buses and the direction of data transmission is determined by dir input. the enable input g can be used to disable the device so that the buses are effectively isolated. the a-port interfaces with the 3v bus, the b-port with the 5v bus. all inputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74lvxc3245 octal dual supply bus transceiver pin connection and iec logic symbols order codes package tube t & r sop 74LVXC3245M 74LVXC3245Mtr tssop 74lvxc3245ttr tssop sop
74lvxc3245 2/12 input and output equivalent circuit pin description truth table x : dont care z : high impedance absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditi ons is not implied pin no symbol name and function 2 dir directional control 3, 4, 5, 6, 7, 8, 9, 10 a1 to a8 data inputs/outputs 21, 20, 19, 18, 17, 16, 15, 14 b1 to b8 data inputs/outputs 22 g output enable input 11, 12, 13 gnd ground (0v) 23 nc not connected 1v cca positive supply voltage 24 v ccb positive supply voltage inputs function output g dir a bus b bus l l output input a = b l h input output b = a hxzzz symbol parameter value unit v cca supply voltage -0.5 to +7.0 v v ccb supply voltage -0.5 to +7.0 v v i dc input voltage -0.5 to v cca + 0.5 v v i/oa dc i/o voltage -0.5 to v cca + 0.5 v v i/ob dc i/o voltage -0.5 to v ccb + 0.5 v i ik dc input diode current 20 ma i ok dc output diode current 50 ma i oa dc output current 50 ma i ob dc output current 50 ma i cca dc v cc or ground current 200 ma i ccb dc v cc or ground current 100 ma p d power dissipation 180 mw t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c
74lvxc3245 3/12 recommended operating conditions 1) v in from 30% to 70% of v cc 2) v cca = 2.7 to 3.6v; v ccb = 2.7 to 5.5v; symbol parameter value unit v cca supply voltage (note 1) 2.7 to 3.6 v v ccb supply voltage (note 1) 2.7 to 5.5 v v i input voltage 0 to v cca v v i/oa i/o voltage 0 to v cca v v i/ob i/o voltage 0 to v ccb v t op operating temperature -55 to 125 c dt/dv input rise and fall time (note 2) 0 to 10 ns/v
74lvxc3245 4/12 dc specifications for v cca symbol parameter test condition value unit v cca (v) v ccb (v) t a = 25 c -40 to 85 c -55 to 125c min. typ. max. min. max. min. max. v iha high level input voltage 2.7 3.0 2.0 2.0 2.0 v 3.0 3.6 2.0 2.0 2.0 3.6 5.5 2.0 2.0 2.0 v ila low level input voltage 2.7 3.0 0.8 0.8 0.8 v 3.0 3.6 0.8 0.8 0.8 3.6 5.5 0.8 0.8 0.8 v oha high level output voltage 3.0 3.0 i o =-100 m a 2.9 2.99 2.9 2.9 v 3.0 3.0 i o =-12 ma 2.56 2.85 2.46 2.46 3.0 3.0 i o =-24 ma 2.35 2.65 2.25 2.25 2.7 3.0 i o =-12 ma 2.3 2.5 2.2 2.2 2.7 4.5 i o =-24 ma 2.1 2.3 2.0 2.0 v ola low level output voltage 3.0 3.0 i o =100 m a 0.0 0.1 0.1 0.1 v 3.0 3.0 i o =24 ma 0.21 0.36 0.44 0.44 2.7 3.0 i o =12 ma 0.11 0.36 0.44 0.44 2.7 4.5 i o =24 ma 0.22 0.42 0.5 0.5 i ia input leakage current 3.6 5.5 v i = v cc or gnd 0.1 1 1 m a i oza high impedance output leakage current 3.6 5.5 v ia = v iha or v ila v ib = v ihb or v ilb v i/oa = v cca or gnd 0.5 5 5 m a i ccta quiescent supply current 3.6 5.5 v ia = v cca or gnd v ib = v ccb or gnd 55050 m a i cctaf quiescent v cca supply current as b port floats 3.6 open v ia = v cca or gnd g = dir = v cca v ib = open 55050 m a d i ccta maximum quiescent supply current / input (an, dir, g ) 3.6 5.5 v ia = v cca - 0.6v v ib = v ccb or gnd 0.35 0.5 0.5 ma
74lvxc3245 5/12 dc specifications for v ccb symbol parameter test condition value unit v cca (v) v ccb (v) t a = 25 c -40 to 85 c -55 to 125c min. typ. max. min. max. min. max. v ihb high level input voltage 2.7 3.0 2.0 2.0 2.0 v 3.0 3.6 2.0 2.0 2.0 3.6 5.5 3.85 3.85 3.85 v ilb low level input voltage 2.7 3.0 0.8 0.8 0.8 v 3.0 3.6 0.8 0.8 0.8 3.6 5.5 1.65 1.65 1.65 v ohb high level output voltage 3.0 3.0 i o =-100 m a 2.9 3.0 2.9 2.9 v 3.0 3.0 i o =-12 ma 2.56 2.85 2.46 2.46 3.0 3.0 i o =-24 ma 2.35 2.65 2.25 2.25 3.0 4.5 i o =-24 ma 3.86 4.25 3.76 3.76 v olb low level output voltage 3.0 3.0 i o =100 m a 0.00 0.1 0.1 0.1 v 3.0 3.0 i o =24 ma 0.21 0.36 0.44 0.44 3.0 4.5 i o =24 ma 0.18 0.36 0.44 0.44 i ib input leakage current 3.6 5.5 v i = v cca or gnd 0.1 1 1 m a i ozb high impedance output leakage current 3.6 5.5 v ia = v iha or v ila v i/ob = v ccb or gnd 0.5 5 5 m a i cctb quiescent supply current 3.6 5.5 v ia = v cca or gnd v ib = v ccb or gnd 55050 m a d i cctb maximum quiescent supply current / input 3.6 5.5 v ia = v cca or gnd v ib = v ccb - 2.1v 1.35 1.5 1.5 ma
74lvxc3245 6/12 dinamic switching characteristics 1) worst case package 2) max number of output defined as (n). data inputs are driven 0v to 3.3v, (n-1) outputs switching and one output at gnd 3) max number of data inputs (n) switching. (n-1) switching 0v to 3.3v. inputs under test switching: 3v to threshold (v ild ). 0v to threshold (v ihd ) f = 1mhz symbol parameter test condition value unit v cca (v) v ccb (v) t a = 25 c -40 to 85 c -55 to 125c min. typ. max. min. max. min. max. v olpa dynamic low level quiet output (note 1, 2) 3.3 5.5 1.0 1.5 v 3.3 5.5 -1.2 -0.6 v olpb dynamic low level quiet output (note 1, 2) 3.3 5.5 0.8 1.2 v 3.3 5.5 -0.8 -0.5 v ihda dynamic high voltage input (note 1, 3) 3.3 5.5 2 v v ilda dynamic low voltage input (note 1, 3) 3.3 5.5 0.8 v v ihdb dynamic high voltage input (note 1, 3) 3.3 5.5 2 v v ildb dynamic low voltage input (note 1, 3) 3.3 5.5 0.8 v
74lvxc3245 7/12 ac electrical characteristics (c l = 50pf, input t r = t f = 3ns) 1) skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch- ing in the same direction, either high or low (t oslh = | t plhm - t plhn |, t oshl = | t phlm - t phln | 2) parameter guaranteed by design 3) typical values referred at v cca = 3.3v, v ccb = 5.0v or v cca = 3.3v, v ccb = 3.3v (*) voltage range is 3.0v 0.3 (**) voltage range is 5.0v 0.5 symbol parameter test condition value (3) unit v ccb (v) t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. t plh propagation delay time (an to bn) 3.0(*) 1.0 5.5 8.5 1.0 9.0 1.0 9.5 ns 5.0(**) 1.0 4.8 8.0 1.0 8.5 1.0 9. t phl propagation delay time (an to bn) 3.0(*) 1.0 5.2 8.0 1.0 8.5 1.0 9.0 5.0(**) 1.0 3.9 6.5 1.0 7.0 1.0 7.5 t pzl output enable time (g to bn) 3.0(*) 1.0 6.0 9.0 1.0 9.5 1.0 9.5 ns 5.0(**) 1.0 4.7 8.0 1.0 8.5 1.0 8.5 t pzh output enable time (g to bn) 3.0(*) 1.0 6.1 9.5 1.0 10.0 1.0 10.5 5.0(**) 1.0 4.8 8.5 1.0 9.0 1.0 9.5 t plz output disable time (g to bn) 3.0(*) 1.0 6.3 9.5 1.0 10.0 1.0 10.5 ns 5.0(**) 1.0 4.0 8.0 1.0 8.5 1.0 8.5 t phz output disable time (g to bn) 3.0(*) 1.0 4.5 8.0 1.0 8.5 1.0 8.5 5.0(**) 1.0 3.8 7.5 1.0 8.0 1.0 8.5 t plh propagation delay time (bn to an) 3.0(*) 1.0 4.4 7.0 1.0 7.5 1.0 7.5 ns 5.0(**) 1.0 3.8 6.5 1.0 7.0 1.0 7.5 t phl propagation delay time (bn to an) 3.0(*) 1.0 5.1 7.5 1.0 8.0 1.0 8.5 5.0(**) 1.0 4.3 7.5 1.0 8.0 1.0 8.5 t pzl output enable time (g to an) 3.0(*) 1.0 6.4 10.0 1.0 10.5 1.0 10.5 ns 5.0(**) 1.0 5.9 9.5 1.0 10.0 1.0 10.5 t pzh output enable time (g to an) 3.0(*) 1.0 5.8 9.0 1.0 9.5 1.0 9.5 5.0(**) 1.0 5.4 9.0 1.0 9.5 1.0 9.5 t plz output disable time (g to an) 3.0(*) 1.0 5.2 9.5 1.0 10.0 1.0 10.5 ns 5.0(**) 1.0 4.6 9.5 1.0 10.0 1.0 10.5 t phz output disable time (g to an) 3.0(*) 1.0 3.4 6.5 1.0 7.0 1.0 7.5 5.0(**) 1.0 3.1 6.5 1.0 7.0 1.0 7.5 t oslh t oshl output to output skew time (note1, 2) 3.0(*) 0.5 1.0 1.5 1.5 ns 5.0(**) 0.5 1.0 1.5 1.5
74lvxc3245 8/12 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 current can be obtained by the following equation. i cc(opr) = c pd x v cc x f in + i cc /8 (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 cca (v) v ccb (v) t a = 25 c -40 to 85 c -55 to 125c min. typ. max. min. max. min. max. c ina input capacitance open open 4.5 10 10 10 v c i/o input/output capacitance 3.3 5.0 10 v c pd dynamic low level quiet output (note 1) a to b 3.3 5.0 55 v c pd dynamic low level quiet output (note 1) b to a 3.3 5.0 40 v test switch t plh , t phl open t pzlh , t plz 2v cc t pzh , t phz open
74lvxc3245 9/12 waveform 1: propagation delays (f=1mhz; 50% duty cycle) waveform 2: output enable and disable time (f=1mhz; 50% duty cycle)
74lvxc3245 10/12 dim. mm. inch min. typ max. min. typ. max. a 2.65 0.104 a1 0.1 0.2 0.004 0.008 a2 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 c 0.5 0.020 c1 45 (typ.) d 15.20 15.60 0.598 0.614 e 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 13.97 0.550 f 7.40 7.60 0.291 0.300 l 0.50 1.27 0.020 0.050 s8 (max.) so-24 mechanical data po13t f c l e a1 b1 a e d e3 b 24 13 112 c1 s a2
74lvxc3245 11/12 dim. mm. inch min. typ max. min. typ. max. a 1.1 0.043 a1 0.05 0.15 0.002 0.006 a2 0.9 0.035 b 0.19 0.30 0.0075 0.0118 c 0.09 0.20 0.0035 0.0079 d 7.7 7.9 0.303 0.311 e 6.25 6.5 0.246 0.256 e1 4.3 4.5 0.169 0.177 e 0.65 bsc 0.0256 bsc k0 80 8 l 0.50 0.70 0.020 0.028 tssop24 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 7047476a
74lvxc3245 12/12 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 ? 2001 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom ? http://www.st.com

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