Key facts
- Brand
- Texas Instruments
- Model
- SN54AHC138
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-06-06
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Texas Instruments SN54AHC138/SN74AHC138 3-Line to 8-Line Decoders Datasheet
This document provides technical specifications and application information for the SN54AHC138 and SN74AHC138 3-line to 8-line decoder/demultiplexer devices. Designed for high-performance memory-decoding and data-routing applications, these chips utilize very short propagation-delay times to minimize system decoding effects in high-speed memory systems.
The datasheet details absolute maximum ratings, recommended operating conditions, electrical characteristics, and switching characteristics over various temperature ranges. It includes logic diagrams, pin configurations for multiple packages (such as PDIP, SOIC, SSOP, TSSOP), and application examples demonstrating how to implement 24-line and 32-line decoding schemes using cascading.
All Texas Instruments SN54AHC138 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What are the enable inputs used for?
Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding.
From: Texas Instruments SN54AHC138/SN74AHC138 3-Line to 8-Line Decoders Datasheet
How can a 24-line decoder be implemented?
A 24-line decoder can be implemented without external inverters using these devices.
From: Texas Instruments SN54AHC138/SN74AHC138 3-Line to 8-Line Decoders Datasheet
How many enable inputs does the decoder have?
It has three enable inputs that can be used to simplify external logic or as data inputs for demultiplexing.