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1/11 june 2001 n high speed: t pd = 3.7ns (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 = 8ma (min) n balanced propagation delays: t plh @ t phl n operating voltage range: v cc (opr) = 2v to 5.5v n pin and function compatible with 74 series 257 n improved latch-up immunity n low noise: v olp = 0.8v (max.) description the 74vhc257 is an advanced high-speed cmos quad 2-channel multiplexer (3-state) fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos technology. it is composed of four independent 2-channel multiplexers with common select and enable (oe ) input. the vhc257 is a non-inverting multiplexer. when the enable input is held "high", all outputs become in high impedance state. if select input is held "low", "a" data is selected, when select input is "high", "b" data is chosen. 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. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. 74vhc257 quad 2 channel multiplexer (3-state) pin connection and iec logic symbols order codes package tube t & r sop 74VHC257M 74VHC257Mtr tssop 74vhc257ttr tssop sop
74vhc257 2/11 input 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 inputs 2, 5, 11, 14 1a to 4a data inputs from source a 3, 6, 10, 13 1b to 4b data inputs from source b 4, 7, 9, 12 1y to 4y 3 state multiplexer outputs 15 oe 3 state output enable inputs (active low) 8 gnd ground (0v) 16 v cc positive supply voltage inputs output oe select a b y hxxxz lllxl llhxh lhxll lhxhh
74vhc257 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 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 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 2 to 5.5 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 1) (v cc = 3.3 0.3v) (v cc = 5.0 0.5v) 0 to 100 0 to 20 ns/v
74vhc257 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 3.0 to 5.5 0.7v cc 0.7v cc 0.7v cc v il low level input voltage 2.0 0.5 0.5 0.5 v 3.0 to 5.5 0.3v cc 0.3v cc 0.3v cc 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 4.5 i o =-50 m a 4.4 4.5 4.4 4.4 3.0 i o =-4 ma 2.58 2.48 2.4 4.5 i o =-8 ma 3.94 3.8 3.7 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 4.5 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 4.5 i o =8 ma 0.36 0.44 0.55 ioz high impedance output leakage current 5.5 v i = v ih or v il v o = v cc or gnd 0.25 2.5 2.5 m a i i input leakage current 0 to 5.5 v i = 5.5v or gnd 0.1 1 1 m a i cc quiescent supply current 5.5 v i = v cc or gnd 44040 m a
74vhc257 5/11 ac electrical characteristics (input t r = t f = 3ns) (*) voltage range is 3.3v 0.3v (**) voltage range is 5.0v 0.5v 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) 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 a, b to y 3.3 (*) 15 5.8 9.3 1.0 11.0 1.0 11.0 ns 3.3 (*) 50 8.3 12.8 1.0 14.5 1.0 14.5 5.0 (**) 15 3.6 5.9 1.0 7.0 1.0 7.0 5.0 (**) 50 5.1 7.9 1.0 9.0 1.0 9.0 t plh t phl propagation delay time select to y 3.3 (*) 15 7.0 11.0 1.0 13.0 1.0 13.0 ns 3.3 (*) 50 9.5 14.5 1.0 16.5 1.0 16.5 5.0 (**) 15 4.0 6.8 1.0 8.0 1.0 8.0 5.0 (**) 50 5.5 8.8 1.0 10.0 1.0 10.0 t pzl t pzh output enable time 3.3 (*) 15 r l = 1k w 6.7 10.5 1.0 12.5 1.0 12.5 ns 3.3 (*) 50 r l = 1k w 9.2 14.0 1.0 16.0 1.0 16.0 5.0 (**) 15 r l = 1k w 3.6 6.8 1.0 8.0 1.0 8.0 5.0 (**) 50 r l = 1k w 5.1 8.8 1.0 10.0 1.0 10.0 t plz t phz output disable time 3.3 (*) 50 r l = 1k w 8.6 12.0 1.0 13.5 1.0 13.5 ns 5.0 (**) 50 r l = 1k w 5.7 7.9 1.0 9.0 1.0 9.0 symbol parameter test condition value unit t a = 25c -40 to 85c -55 to 125c min. typ. max. min. max. min. max. c in input capacitance 6101010pf c out output capacitance 8pf c pd power dissipation capacitance (note 1) 18 pf
74vhc257 6/11 dynamic switching characteristics 1) worst case package. 2) max number of outputs defined as (n). data inputs are driven 0v to 5.0v, (n-1) outputs switching and one output at gnd. 3) max number of data inputs (n) switching. (n-1) switching 0v to 5.0v. inputs under test switching: 5.0v to threshold (v ild ), 0v to threshold (v ihd ), f=1mhz. test circuit c l =15/ 50pf or equivalent (includes jig and probe capacitance) r l = r 1 = 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. v olp dynamic low voltage quiet output (note 1, 2) 5.0 c l = 50 pf 0.3 0.8 v v olv -0.8 -0.3 v ihd dynamic high voltage input (note 1, 3) 5.0 3.5 v v ild dynamic low voltage input (note 1, 3) 5.0 1.5 v test switch t plh , t phl open t pzl , t plz v cc t pzh , t phz gnd
74vhc257 7/11 waveform 1: propagation delays for inverting conditions (f=1mhz; 50% duty cycle) ) waveform 2: propagation delays for non-inverting conditions (f=1mhz; 50% duty cycle)
74vhc257 8/11 waveform 3: output enable and disable time (f=1mhz; 50% duty cycle)
74vhc257 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
74vhc257 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
74vhc257 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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