1/9 june 2001 n high speed: t pd = 4.1 ns (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 = 8 ma (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 157 n improved latch-up immunity n low noise: v olp = 0.8v (max.) description the 74vhc157 is an advanced high-speed cmos quad 2-channel multiplexer fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos technology. it consists of four 2-input digital multiplexer with common select and strobe inputs. it is a non-inverting multiplexer. when the strobe input is held high selection of data is inhibited and all the outputs become low. the select decoding determines whether the a or b inputs get routed to their corresponding y outputs. 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. 74vhc157 quad 2 channel multiplexer pin connection and iec logic symbols order codes package tube t & r sop 74vhc157m 74vhc157mtr tssop 74VHC157TTR tssop sop
74vhc157 2/9 input equivalent circuit pin description truth table x : dont care logic diagram 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 multiplexer outputs 15 strobe strobe input 8 gnd ground (0v) 16 v cc positive supply voltage inputs output strobe select a b y hxxxl lllxl llhxh lhxll lhxhh
74vhc157 3/9 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
74vhc157 4/9 dc specifications ac electrical characteristics (input t r = t f = 3ns) (*) voltage range is 3.3v 0.3v (**) voltage range is 5.0v 0.5v 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 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 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 6.2 9.7 1.0 11.5 1.0 11.5 ns 3.3 (*) 50 8.7 13.2 1.0 15.0 1.0 15.0 5.0 (**) 15 4.1 6.4 1.0 7.5 1.0 7.5 5.0 (**) 50 5.6 8.4 1.0 9.5 1.0 9.5 t plh t phl propagation delay time select to y 3.3 (*) 15 8.4 13.2 1.0 15.5 1.0 15.5 ns 3.3 (*) 50 10.9 16.7 1.0 19.0 1.0 19.0 5.0 (**) 15 5.3 8.1 1.0 9.5 1.0 9.5 5.0 (**) 50 6.8 10.1 1.0 11.5 1.0 11.5 t plh t phl propagation delay time strobe to y 3.3 (*) 15 8.7 13.6 1.0 16.0 1.0 16.0 ns 3.3 (*) 50 11.2 17.1 1.0 19.5 1.0 19.5 5.0 (**) 15 5.6 8.6 1.0 10.0 1.0 10.0 5.0 (**) 50 7.1 10.6 1.0 12.0 1.0 12.0
74vhc157 5/9 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) 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 t = z out of pulse generator (typically 50 w ) 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 pd power dissipation capacitance (note 1) 18 pf 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
74vhc157 6/9 waveform 1: propagation delays for inverting conditions waveform 2: propagation delays for non-inverting conditions
74vhc157 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
74vhc157 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 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
74vhc157 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 9/9
|
