Fairchild 54F, 74F138 Data Handbook
Summary
The 54F/74F138 is a high-speed 1-of-8 decoder/demultiplexer, essential for designing robust digital circuits and managing address decoding in bipolar memory systems. This manual provides comprehensive technical specifications, including multiple package options (DIP, SOIC), detailed pin assignments, and the full operational logic. It is indispensable for hardware engineers and embedded system developers who require easy-to-expand, reliable signal selection capabilities, allowing expansion up to 1-of-32 lines with guaranteed performance.
Page 1 Text Content
November
-o f-8 r/ ltip le
54F/74F138 1-of-8 Decoder/Demultiplexer General Description Features
The ’F138 is high-speed 1-of-8 decoder/demultiplexer. Demultiplexing capability
This device is ideally suited for high-speed bipolar memory Multiple input enable for easy expansion chip select address decoding. The multiple input enables Active LOW mutually exclusive outputs allow parallel expansion to 1-of-24 decoder using just Guaranteed 4000V minimum ESD protection three ’F138 devices or 1-of-32 decoder using four ’F138 devices and one inverter.
Package
Commercial Military Package Description
Number
74F138PC N16E 16-Lead (0.300× Wide) Molded Dual-In-Line
54F138DM (Note 2) J16A 16-Lead Ceramic Dual-In-Line
74F138SC (Note 1) M16A 16-Lead (0.150× Wide) Molded Small Outline, JEDEC
74F138SJ (Note 1) M16D 16-Lead (0.300× Wide) Molded Small Outline, EIAJ
54F138FM (Note 2) W16A 16-Lead Cerpack
54F138LM (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type
Note 1: Devices also available in 13× reel. Use suffix SCX and SJX. Note 2: Military grade device with environmental and burn-in processing. Use suffix DMQB, FMQB and LMQB.
Logic Symbols Connection Diagrams
Pin Assignment for DIP, Pin Assignment SOIC and Flatpak for LCC
TL/F/9478–3
IEEE/IEC
TL/F/9478–1
TL/F/9478–2
TL/F/9478–6
TRI-STATEÉ is registered trademark of National Semiconductor Corporation.
C1995 National Semiconductor Corporation TL/F/9478 RRD-B30M75/Printed in U. S. A.
Page Summary Contents For Fairchild 54F, 74F138 Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 10 |
| File Size | 175.82 KB |
| Published | June 20, 2026 |
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Frequently Asked Questions
How can the 1-of-8 decoder be expanded to a larger output?
It can be expanded up to a 1-of-32 decoder using four 'F138 devices and one inverter.
What are the typical supply voltage ranges for commercial models?
The recommended operating supply voltage is between 4.5V and 5.5V for commercial grade operation.
What package types do you offer for the 'F138 chip?
Available packages include PC, DM, SC, and SJ formats, depending on lead pitch and material.
Is the 'F138 safe for use in life support systems?
No. Use is restricted and requires expressed written approval from National Semiconductor Corporation if used in critical life support devices.