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1/11 august 2001 n high speed : t pd = 11 ns (typ.) at v cc = 6v 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 symmetrical output impedance: |i oh | = i ol = 6ma (min) n balanced propagation delays: t plh @ t phl n wide operating voltage range: v cc (opr) = 2v to 6v n pin and function compatible with 74 series 257 description the m74hc257 is an high speed cmos quad 2 channel multiplexer (3-state) fabricated with silicon gate c 2 mos technology. this ic is composed of an independent 2-channel multiplexer with common select and enable (oe ) input. the m74hc257 is a non-inverting multiplexer. when the enable input is held "high", outputs of the ic become in a high-impedance state. if select input is held low, "a" data is selected, when select is high , "b" data is chosen. all inputs are equipped with protection circuits against static discharge and transient excess voltage. m74hc257 quad 2 channel multiplexer (3-state) pin connection and iec logic symbols order codes package tube t & r dip m74hc257b1r sop m74hc257m1r M74HC257RM13TR tssop m74hc257ttr tssop dip sop
m74hc257 2/11 input and output equivalent circuit pin description truth table x : dont care z : high impedance logic diagram this logic diagram has not be used to estimate propagation delays pin no symbol name and function 1 select common data select input 2, 5, 14, 11 1a to 4a data input from source a 3, 6, 13, 10 1b to 4b data input from source b 4, 7, 12, 9 1y to 4y 3 state multiplexer outputs 15 oe 3 state output enable inputs (active low) 8 gnd ground (0v) 16 vcc positive supply voltage inputs output oe select a b y hxxxz lllxl llhxh lhxll lhxhh
m74hc257 3/11 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 (*) 500mw at 65 c; derate to 300mw by 10mw/ c from 65 c to 85 c recommended operating conditions 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 35 ma i cc or i gnd dc v cc or ground current 70 ma p d power dissipation 500(*) mw t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c symbol parameter value unit v cc supply voltage 2 to 6 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 t r , t f input rise and fall time v cc = 2.0v 0 to 1000 ns v cc = 4.5v 0 to 500 ns v cc = 6.0v 0 to 400 ns
m74hc257 4/11 dc specifications 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 2.0 1.5 1.5 1.5 v 4.5 3.15 3.15 3.15 6.0 4.2 4.2 4.2 v il low level input voltage 2.0 0.5 0.5 0.5 v 4.5 1.35 1.35 1.35 6.0 1.8 1.8 1.8 v oh high level output voltage 2.0 i o =-20 m a 1.9 2.0 1.9 1.9 v 4.5 i o =-20 m a 4.4 4.5 4.4 4.4 6.0 i o =-20 m a 5.9 6.0 5.9 5.9 4.5 i o =-6.0 ma 4.18 4.31 4.13 4.10 6.0 i o =-7.8 ma 5.68 5.8 5.63 5.60 v ol low level output voltage 2.0 i o =20 m a 0.0 0.1 0.1 0.1 v 4.5 i o =20 m a 0.0 0.1 0.1 0.1 6.0 i o =20 m a 0.0 0.1 0.1 0.1 4.5 i o =6.0 ma 0.17 0.26 0.33 0.40 6.0 i o =7.8 ma 0.18 0.26 0.33 0.40 i i input leakage current 6.0 v i = v cc or gnd 0.1 1 1 m a i oz high impedance output leakage current 6.0 v i = v ih or v il v o = v cc or gnd 0.5 5 10 m a i cc quiescent supply current 6.0 v i = v cc or gnd 44080 m a
m74hc257 5/11 ac electrical characteristics (c l = 50 pf, input t r = t f = 6ns) 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 x v cc x f in + i cc /4 (per channel) 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 tlh t thl output transition time 2.0 50 25 60 75 90 ns 4.5 7121519 6.0 6101315 t plh t phl propagation delay time (a, b - y) 2.0 50 45 100 125 150 ns 4.5 13 20 25 30 6.0 11 17 21 26 2.0 150 62 140 175 210 ns 4.5 18 28 35 42 6.0 15 24 30 36 t plh t phl propagation delay time (select - y) 2.0 50 45 100 125 150 ns 4.5 13 20 25 30 6.0 11 17 21 26 2.0 150 62 140 175 210 ns 4.5 18 28 35 42 6.0 15 24 30 36 t pzl t pzh high impedance output enable time 2.0 50 r l = 1 k w 40 110 140 165 ns 4.5 12 22 28 33 6.0 10 19 24 28 2.0 150 r l = 1 k w 57 150 190 225 ns 4.5 17 30 38 45 6.0 14 26 32 38 t plz t phz high impedance output disable time 2.0 50 r l = 1 k w 28 140 175 210 ns 4.5 14 28 35 42 6.0 13 24 30 36 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 5101010pf c out output capacitance 10 pf c pd power dissipation capacitance (note 1) 47 pf
m74hc257 6/11 test circuit c l = 50pf/150pf or equivalent (includes jig and probe capacitance) r 1 = 1k w or equivalent r t = z out of pulse generator (typically 50 w ) waveform 1: propagation delay time (f=1mhz; 50% duty cycle) test switch t plh , t phl open t pzl , t plz v cc t pzh , t phz gnd
m74hc257 7/11 waveform 2 :output enable and disable time (f=1mhz; 50% duty cycle)
m74hc257 8/11 dim. mm. inch min. typ max. min. typ. max. a1 0.51 0.020 b 0.77 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 d 20 0.787 e 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 f 7.1 0.280 i 5.1 0.201 l 3.3 0.130 z 1.27 0.050 plastic dip-16 (0.25) mechanical data p001c
m74hc257 9/11 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
m74hc257 10/11 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 80 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
m74hc257 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 11/11

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