DM74S157

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 5 ns DM74S158 4 ns s Typical power dissipation DM74S157 250 mW DM74S158 195 mW Ordering Code: Order Number DM74S157N DM74S158N Package Number Package Description N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide N16E 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 H = HIGH Level L = LOW Level X = Don’t Care Strobe H L L L L Logic Diagrams Inputs Select A XX LL LH HX HX B X X X L H DM74S157 Output Y DM74S157 DM74S158 LH LH HL LH HL DM74S158 www.fairchildsemi.com 2 DM74S157 DM74S15...