SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SDAS055E - APRIL 1982 - REVISED JULY 1996

Please be aware that an important notice concerningavailability, standard warranty, and use in critical applications ofTexasInstruments semiconductor products and disclaimers theretoappears at the end of this data sheet.

features

Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems
Incorporate Three Enable Inputs to Simplify Cascading and/or Data Reception
Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

description

The ´ALS138A and ´AS138 are 3-line to 8-linedecoders/demultiplexers designed for high-performance memory-decodingor data-routing applications requiring very short propagation delaytimes. In high-performance systems, these devices can be used tominimize the effects of system decoding. When employed withhigh-speed memories with a fast enable circuit, the delay times ofthe decoder and the enable time of the memory are usually less thanthe typical access time of the memory. The effective system delayintroduced by the Schottky-clamped system decoder is negligible.

The conditions at the binary-select (A, B, and C) inputs and thethree enable (G1, , and ) inputs select one of eight outputlines. Two active-low and one active-high enable inputs reduce theneed for external gates or inverters when expanding. A 24-linedecoder can be implemented without external inverters and a 32-linedecoder requires only one inverter. An enable input can be used as adata input for demultiplexing applications.

The SN54ALS138A and SN54AS138 are characterized for operation overthe full military temperature range of -55°C to 125°C. TheSN74ALS138A and SN74AS138 are characterized for operation from0°C to 70°C.

Title: 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
Product Family: MULTIPLEXERS
Device Functionality: DECODER/DEMULTIPLEXER
Orderable Devices: JM38510/37701B2A, JM38510/37701BEA, SN54ALS138AJ, SNJ54ALS138AFK, SNJ54ALS138AJ, SNJ54ALS138AW, SN54AS138J, SNJ54AS138FK, SNJ54AS138J, SN74ALS138AD, SN74ALS138ADR, SN74ALS138AN, SN74AS138D, SN74AS138DR, SN74AS138N, SN74AS138N3

View the complete PDF datasheet: sdas055e.pdf (117 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.