TL/F/9478
54F/74F138
1-of-8
Decoder/Demultiplexer
November 1994
54F/74F138
1-of-8 Decoder/Demultiplexer
General Description
The ’F138 is a high-speed 1-of-8 decoder/demultiplexer.
This device is ideally suited for high-speed bipolar memory
chip select address decoding. The multiple input enables
allow parallel expansion to a 1-of-24 decoder using just
three ’F138 devices or a 1-of-32 decoder using four ’F138
devices and one inverter.
Features
Y
Demultiplexing capability
Y
Multiple input enable for easy expansion
Y
Active LOW mutually exclusive outputs
Y
Guaranteed 4000V minimum ESD protection
Commercial Military
Package
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 C
Note 1: Devices also available in 13 reel. Use suffix e SCX and SJX.
Note 2: Military grade device with environmental and burn-in processing. Use suffix e DMQB, FMQB and LMQB.
Logic Symbols
TL/F/9478–3
IEEE/IEC
TL/F/9478–6
Connection Diagrams
Pin Assignment for DIP,
SOIC and Flatpak
TL/F/9478–1
Pin Assignment
for LCC
TL/F/9478–2
TRI-STATE is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.