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SN74ALS138A

Texas Instruments
Part Number SN74ALS138A
Manufacturer Texas Instruments
Description 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
Published Dec 10, 2020
Detailed Description SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SDAS055E – APRIL 1982 – REVISED...
Datasheet PDF File SN74ALS138A PDF File

SN74ALS138A
SN74ALS138A

Overview
SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SDAS055E – APRIL 1982 – REVISED JULY 1996 D Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems D Incorporate Three Enable Inputs to Simplify Cascading and /or Data Reception D 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-line decoders/demultiplexers designed for highperformance memory-decoding or data-routing applications requiring very short propagation delay times.
In high-performance systems, these devices can be used to minimize the effects of system decoding.
When employed with high-speed memories with a fast enable circuit, the delay times of the decoder and the enable time of the memory are usually less than the typical access time of the memory.
The effective system delay introduced by the Schottky-clamped system decoder is negligible.
SN54ALS138A, SN54AS138 .
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J PACKAGE SN74ALS138A, SN74AS138 .
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D OR N PACKAGE (TOP VIEW) A1 B2 C3 G2A 4 G2B 5 G1 6 Y7 7 GND 8 16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6 SN54ALS138A, SN54AS138 .
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FK PACKAGE (TOP VIEW) Y0 VCC NC A B C G2A NC G2B G1 3 2 1 20 19 4 18 Y1 5 17 Y2 6 16 NC 7 15 Y3 8 14 Y4 9 10 11 12 13 Y5 Y6 NC GND Y7 The conditions at the binary-select (A, B, and C) inputs and the three enable (G1, G2A, and G2B) inputs select one of eight output lines.
Two NC – No internal connection active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding.
A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter.
An enable input can be used as a data input for demultiplexing applications.
The SN54ALS138A and SN54AS138 are characterized for operation over the full military temperature range of – 55°C to 125°C.
The ...


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