M54HCT157/158 M74HCT157/158 HCT157 QUAD 2 CHANNEL .
ST Microelectronics
M54HCT157 - QUAD 2 CHANNEL MULTIPLEXER
M54HCT157/158 M74HCT157/158 HCT157 QUAD 2 CHANNEL MULTIPLEXER HCT158 QUAD 2 CHANNEL MULTIPLEXER (INV.) . . . . . . . HIGH SPEED tPD = 21 ns (TYP.) A.