SN74ALS257A - Texas Instruments

SN74ALS257A Quad 2-Line To 1-Line Data Selectors/Multiplexers

These data selectors/multiplexers are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at a high logic level. SN54ALS257A, SN54ALS258A . . . J PACKAGE SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 . . . D OR N PACKAGE (T.

Features

NC VCC OE The SN54ALS257A and SN54ALS258A are characterized for operation over the full military temperature range of −55°C to 125°C. The SN74ALS257A, SN74ALS258A, SN74AS257, and SN74AS258 are characterized for operation from 0°C to 70°C. 1B 3 2 1 20 19 4 18 4A 1Y 5 17 4B NC 6 16 NC 2A 7 15 4Y 2B 8 14 3A 9 10 11 12 13 2Y GND NC 3Y 3B NC − No internal connection FUNCTION TABLE INPUTS OUTPUT Y OE A /B DATA AB SN54ALS257A SN74ALS257A SN74AS257 SN54ALS258A SN74ALS258A SN74AS258 HXXX Z Z LLLX L H L LHX H L L HX L L H LHXH H L Please be aware that an important.