1/10 february 2001 n high speed: t pd = 8ns (max.) at t a =25 c v cca = 3.3v v ccb = 5.0v n low power dissipation: i cca =i ccb =5 m a(max.) at t a =25 c 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 tecnology. 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 sistems, 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 2/10 input and output equivalent circuit pin description truth table x=don't care; z=high impedance absolute maximum ratings absolute maximum rating are those value beyond which damage to the device may occour. functional operation under these condition is not implied (*) 500mw: @ 65 c derated to 300mw by 10mw/ c: 65 cto85 c pin no symbol name qnd 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 hxz zz symbol paramet er 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 3/10 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; dc specification for v cca 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 temperqture -40 to 85 c dt/dv input rise and fall time (note 2) 0 to 10 ns/v symbol parameter test condit ion value unit v cca (v) v ccb (v) t a =25 c -40 to 85 c min. typ. max. min. max. v iha high level input voltage 2.7 3.0 2.0 2.0 v 3.0 3.6 2.0 2.0 3.6 5.5 2.0 2.0 v ila low level input voltage 2.7 3.0 0.8 0.8 v 3.0 3.6 0.8 0.8 3.6 5.5 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 v 3.0 3.0 i o =-12 ma 2.56 2.85 2.46 3.0 3.0 i o =-24 ma 2.35 2.65 2.25 2.7 3.0 i o =-12 ma 2.3 2.5 2.2 2.7 4.5 i o =-24 ma 2.1 2.3 2.0 v ola low level output voltage 3.0 3.0 i o =100 m a 0.0 0.1 0.1 v 3.0 3.0 i o =24 ma 0.21 0.36 0.44 2.7 3.0 i o =12 ma 0.11 0.36 0.44 2.7 4.5 i o =24 ma 0.22 0.42 0.5 i ia input leakage current 3.6 5.5 v i =v cc or gnd 0.1 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 m a i ccta quiescent supply current 3.6 5.5 v ia =v cca or gnd v ib =v ccb or gnd 550 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 550 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 ma
74lvxc3245 4/10 dc specification for v ccb 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 condit ion value unit v cca (v) v ccb (v) t a =25 c -40 to 85 c min. typ. max. min. max. v ihb high level input voltage 2.7 3.0 2.0 2.0 v 3.0 3.6 2.0 2.0 3.6 5.5 3.85 3.85 v ilb low level input voltage 2.7 3.0 0.8 0.8 v 3.0 3.6 0.8 0.8 3.6 5.5 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 v 3.0 3.0 i o =-12 ma 2.56 2.85 2.46 3.0 3.0 i o =-24 ma 2.35 2.65 2.25 3.0 4.5 i o =-24 ma 3.86 4.25 3.76 v olb low level output voltage 3.0 3.0 i o =100 m a 0.00 0.1 0.1 v 3.0 3.0 i o =24 ma 0.21 0.36 0.44 3.0 4.5 i o =24 ma 0.18 0.36 0.44 i ib input leakage current 3.6 5.5 v i =v cca or gnd 0.1 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 m a i cctb quiescent supply current 3.6 5.5 v ia =v cca or gnd v ib =v ccb or gnd 550 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 ma symbol parameter test condit ion value unit v cca (v) v ccb (v) t a =25 c -40 to 85 c min. typ. 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 5/10 ac electrical characteristics 1) skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching 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 (*) typical values at v cca = 3.3v, v ccb = 5.0v (**) typical values at v cca = 3.3v, v ccb = 3.3v capacitance characteristics 1) c pd is defined as the value of the ic's internal equivqlent capacitance which is calculated from the operating current consumption without load. (refer to test circuit). average current cqn be obtqined by the following equation. i cc(opr) =c pd xv cc xf in +i cc /8 (per circuit) symbol parameter value unit v ccb =5 0.5v v ccb =3 0.3v t a =25 c -40 to 85 c -40 to 85 c -40 to 85 c min. typ. (*) max. min. max. min. typ. (**) max. min. max. t plh propagation delay time an to bn 1.0 4.8 8.0 1.0 8.5 1.0 5.5 8.5 1.0 9.0 ns t phl 1.0 3.9 6.5 1.0 7.0 1.0 5.2 8.0 1.0 8.5 t pzl output enable time gtobn 1.0 4.7 8.0 1.0 8.5 1.0 6.0 9.0 1.0 9.5 ns t pzh 1.0 4.8 8.5 1.0 9.0 1.0 6.1 9.5 1.0 10.0 t plz output disable time gtobn 1.0 4.0 8.0 1.0 8.5 1.0 6.3 9.5 1.0 10.0 ns t phz 1.0 3.8 7.5 1.0 8.0 1.0 4.5 8.0 1.0 8.5 t plh propagation delay time bn to an 1.0 3.8 6.5 1.0 7.0 1.0 4.4 7.0 1.0 7.5 ns t phl 1.0 4.3 7.5 1.0 8.0 1.0 5.1 7.5 1.0 8.0 t pzl output enable time gtoan 1.0 5.9 9.5 1.0 10.0 1.0 6.4 10.0 1.0 10.5 ns t pzh 1.0 5.4 9.0 1.0 9.5 1.0 5.8 9.0 1.0 9.5 t plz output disable time gtoan 1.0 4.6 9.5 1.0 10.0 1.0 5.2 9.5 1.0 10.0 ns t phz 1.0 3.1 6.5 1.0 7.0 1.0 3.4 6.5 1.0 7.0 t oslh t oshl output to output skew time (note1, 2) 1.0 1.5 1.5 1.5 1.5 1.5 ns symbol parameter test condit ion value unit v cca (v) v ccb (v) t a =25 c -40 to 85 c min. typ. max. min. max. c ina input capacitance open open 4.5 v c i/o input/output capacitance 3.3 5.0 10 v c pd dynamic low level quiet output (note 1) atob 3.3 5.0 55 v c pd dynamic low level quiet output (note 1) btoa 3.3 5.0 40 v
74lvxc3245 6/10 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 ) waveform 1: propagation delays (f=1mhz; 50% duty cycle) test switch t plh ,t phl open t pzlh ,t plz 2v cc t pzh ,t phz open
74lvxc3245 7/10 waveform 2: output enable and disable time (f=1mhz; 50% duty cycle)
74lvxc3245 8/10 dim. mm inch min. typ. max. min. typ. max. a 2.65 0.104 a1 0.10 0.20 0.004 0.007 a2 2.45 0.096 b 0.35 0.49 0.013 0.019 b1 0.23 0.32 0.009 0.012 c 0.50 0.020 c1 45 (typ.) d 15.20 15.60 0.598 0.614 e 10.00 10.65 0.393 0.420 e 1.27 0.05 e3 13.97 0.55 f 7.40 7.60 0.291 0.299 l 0.50 1.27 0.19 0.050 s 8 (max.) f c l e a1 b1 a e d e3 b 24 13 112 c1 s a2 p013t so-24 mechanical data
74lvxc3245 9/10 dim. mm inch min. typ. max. min. typ. max. a 1.1 0.433 a1 0.05 0.10 0.15 0.002 0.004 0.006 a2 0.85 0.9 0.95 0.335 0.354 0.374 b 0.19 0.30 0.0075 0.0118 c 0.09 0.2 0.0035 0.0079 d 7.7 7.8 7.9 0.303 0.307 0.311 e 6.25 6.4 6.5 0.246 0.252 0.256 e1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 bsc 0.0256 bsc k0 o 4 o 8 o 0 o 4 o 8 o l 0.50 0.60 0.70 0.020 0.024 0.028 c e b a2 a e1 d 1 pin 1 identification a1 l k e tssop24 mechanical data
74lvxc3245 10/10 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 infringe ment of patents or other righ ts of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this pub lication are subject to change without notice. thi s pub lication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authori zed for use as critical components in life suppo rt 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 - swit zerland - united kingdom ? http://w ww.st.com
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