器件名称:
DM74S158
功能描述:
Quad 1 of 2 Line Data Selector/Multiplexer
文件大小:
53.24KB 共5页
简 介:
DM74S157 DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer August 1986 Revised April 2000 DM74S157 DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer General Description These data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four output gates. A separate strobe input is provided. A 4-bit word is selected from one of two sources and is routed to the four outputs. The DM74S157 presents true data whereas the DM74S158 presents inverted data to minimize propagation delay time. Applications Expand any data input point Multiplex dual data buses Generate four functions of two variables (one variable is common) Source programmable counters Features s Buffered inputs and outputs s Typical propagation time DM74S157 DM74S158 DM74S157 DM74S158 5 ns 4 ns 250 mW 195 mW s Typical power dissipation Ordering Code: Order Number DM74S157N DM74S158N Package Number N16E N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagrams DM74S157 DM74S158 2000 Fairchild Semiconductor Corporation DS006470 www.fairchildsemi.com DM74S157 DM74S158 Function Table Inputs Strobe H L L L L H = HIGH Level L = LOW Level X = Don’t Care Output Y A X L H X X B X X X L H DM74S157 DM74S158 L L H L H H H L H L Select X L L H H Logic Diagrams DM74S157 DM74S158 www.fairchildsemi.com 2 DM74S157 DM74S158 Absolute Max……
