1/9 july 2001 n high speed : t pd = 5.5ns (typ.) at v cc =3.3v n 5v tolerant inputs n input voltage level : v il =0.8v, v ih =2v at v cc =3v n low power dissipation: i cc =4 m a (max.) at t a =25 c n low noise: v olp = 0.3v (typ.) at v cc = 3.3v n symmetrical output impedance: |i oh |=i ol = 4ma (min) n balanced propagation delays: t plh @ t phl n operating voltage range: v cc (opr) = 2v to 3.6v (1.2v data retention) n pin and function compatible with 74 series 138 n improved latch-up immunity n power down protection on inputs description the 74lvx138 is a low voltage cmos 3 to 8 line decoder (inverting) fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos technology. it is ideal for low power, battery operated and low noise 3.3v applications. if the device is enabled, 3 binary select (a, b, and c) determine which one of the outputs will go low. if enable input g1 is held low or either g2a or g2b is held high, the decoding function is inhibited and all the 8 outputs go to high. tree enable inputs are provided to ease cascade connection and application of address decoders for memory systems. power down protection is provided on all inputs and 0 to 7v can be accepted on inputs with no regard to the supply voltage. this device can be used to interface 5v to 3v system. it combines high speed performance with the true cmos low power consumption. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74lvx138 low voltage cmos 3 to 8 line decoder (inv.) with 5v tolerant inputs pin connection and iec logic symbols order codes package tube t & r sop 74lvx138m 74lvx138mtr tssop 74LVX138TTR tssop sop
74lvx138 2/9 input equivalent circuit pin description truth table x : don't care logic diagram this logic diagram has not be used to estimate propagation delays pin no symbol name and function 1, 2, 3 a, b, c address inputs 4, 5 g2a, g2b enable inputs 6 g1 enable input 15, 14, 13, 12, 11, 10, 9, 7 y0 to y7 outputs 8 gnd ground (0v) 16 v cc positive supply voltage inputs outputs enable select g2b g2a g1 c b a y0 y1 y2 y3 y4 y5 y6 y7 xxl xxxhhhhhhhh xhxxxxhhhhhhhh hxxxxxhhhhhhhh l lhl l l lhhhhhhh l lhl lhhlhhhhhh l lhlhlhhlhhhhh l lh lhhhhh lhhhh l lhhl l hhhhl hhh l lhhlhhhhhh lhh l lhhhl hhhhhhl h l lhhhhhhhhhhh l
74lvx138 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) truth table guaranteed: 1.2v to 3.6v 2) v in from 0.8v to 2.0v dc specifications 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 50 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 (note 1) 2 to 3.6 v v i input voltage 0 to 5.5 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 2) (v cc = 3.3v) 0 to 100 ns/v symbol parameter test condition value unit v cc (v) t a =25 c -40 to 85 c -55 to 125 c min. typ. max. min. max. min. max. v ih high level input voltage 2.0 1.5 1.5 1.5 v 3.0 2.0 2.0 2.0 3.6 2.4 2.4 2.4 v il low level input voltage 2.0 0.5 0.5 0.5 v 3.0 0.8 0.8 0.8 3.6 0.8 0.8 0.8 v oh high level output voltage 2.0 i o =-50 m a 1.9 2.0 1.9 1.9 v 3.0 i o =-50 m a 2.9 3.0 2.9 2.9 3.0 i o =-4 ma 2.58 2.48 2.4 v ol low level output voltage 2.0 i o =50 m a 0.0 0.1 0.1 0.1 v 3.0 i o =50 m a 0.0 0.1 0.1 0.1 3.0 i o =4 ma 0.36 0.44 0.55 i i input leakage current 3.6 v i =5vorgnd 0.1 1 1 m a i cc quiescent supply current 3.6 v i =v cc or gnd 44040 m a
74lvx138 4/9 dynamic switching characteristics 1) worst case package. 2) max number of outputs 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: 3.3v to threshold (v ild ), 0v to threshold (v ihd ), f=1mhz. ac electrical characteristics (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 2) parameter guaranteed by design (*) voltage range is 3.3v 0.3v symbol parameter test condition value unit v cc (v) t a =25 c -40 to 85 c -55 to 125 c min. typ. max. min. max. min. max. v olp dynamic low voltage quiet output (note 1, 2) 3.3 c l =50pf 0.3 0.5 v v olv -0.5 -0.3 v ihd dynamic high voltage input (note 1, 3) 3.3 2 v ild dynamic low voltage input (note 1, 3) 3.3 0.8 symbol parameter test condition value unit v cc (v) c l (pf) t a =25 c -40 to 85 c -55 to 125 c min. typ. max. min. max. min. max. t plh t phl propagation delay time a, b, c to y 2.7 15 7.1 13.8 1.0 16.5 1.0 18.5 ns 2.7 50 9.6 17.3 1.0 20.0 1.0 22.0 3.3 (*) 15 5.5 8.8 1.0 10.5 1.0 11.5 3.3 (*) 50 8.0 12.3 1.0 14.0 1.0 15.0 t plh t phl propagation delay time g1 to y 2.7 15 8.7 16.3 1.0 19.5 1.0 205 ns 2.7 50 11.2 19.8 1.0 23.0 1.0 25.0 3.3 (*) 15 6.8 10.6 1.0 12.5 1.0 13.5 3.3 (*) 50 9.3 14.1 1.0 16.0 1.0 17.0 t plh t phl propagation delay time g2a or g2b to y 2.7 15 8.8 16.0 1.0 18.5 1.0 19.5 ns 2.7 50 11.3 19.5 1.0 22.0 1.0 23.0 3.3 (*) 15 6.9 10.4 1.0 11.5 1.0 13.5 3.3 (*) 50 9.4 13.9 1.0 15.0 1.0 17.0 t oslh t oshl output to output skew time (note1, 2) 2.7 50 0.5 1.0 1.5 1.5 ns 3.3 (*) 50 0.5 1.0 1.5 1.5
74lvx138 5/9 capacitive characteristics 1) c pd is defined as the value of the ic's 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 test circuit c l =15/50pf or equivalent (includes jig and probe capacitance) r t =z out of pulse generator (typically 50 w ) symbol parameter test condition value unit v cc (v) t a =25 c -40 to 85 c -55 to 125 c min. typ. max. min. max. min. max. c in input capacitance 3.3 4 10 10 pf c pd power dissipation capacitance (note 1) 3.3 f in = 10mhz 34 pf
74lvx138 6/9 waveform 1: propagation delays for inverting outputs (f=1mhz; 50% duty cycle) waveform 2:propagation delaysfor non-invertingoutputs (f=1mhz; 50% duty cycle)
74lvx138 7/9 dim. mm. inch min. typ max. min. typ. max. a 1.75 0.068 a1 0.1 0.2 0.003 0.007 a2 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 c 0.5 0.019 c1 45 (typ.) d 9.8 10 0.385 0.393 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 f 3.8 4.0 0.149 0.157 g 4.6 5.3 0.181 0.208 l 0.5 1.27 0.019 0.050 m 0.62 0.024 s8 (max.) so-16 mechanical data po13h
74lvx138 8/9 dim. mm. inch min. typ max. min. typ. max. a 1.2 0.047 a1 0.05 0.15 0.002 0.004 0.006 a2 0.8 1 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0089 d 4.9 5 5.1 0.193 0.197 0.201 e 6.2 6.4 6.6 0.244 0.252 0.260 e1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 bsc 0.0256 bsc k0 8 0 8 l 0.45 0.60 0.75 0.018 0.024 0.030 tssop16 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 0080338d
74lvx138 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 9/9
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