54FCT138
1-of-8 Decoder/Demultiplexer
General Description
The FCT138 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 al-
low parallel expansion to a 1-of-24 decoder using just three
FCT138 devices or a 1-of-32 decoder using four FCT138 de-
vices and one inverter.
Features
n Demultiplexing capability
n Multiple input enable for easy expansion
n Active LOW mutually exclusive outputs
n Outputs sink capability of 32mA, source capability of
12mA
n TTL input and output level compatible
n CMOS power consumption
n Standard Microcircuit Drawing (SMD) 5962-8765401
Ordering Code
Military Package Package Description
Number
54FCT138DMQB J16A 16-Lead Ceramic Dual-In-Line
54FCT138FMQB W16A 16-Lead Cerpack
54FCT138LMQB E20A 20-Lead Ceramic Leadless Chip Carrier, Type C
Logic Symbols
Pin Names Description
A
0
–A
2
Address Inputs
E
1
–E
2
Enable Inputs
E
3
Enable Input
O
0
–O
7
Outputs
Connection Diagrams
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
DS100963-1
IEEE/IEC
DS100963-7
Pin Assignment
for DIP and Flatpak
DS100963-2
Pin Assignment
for LCC
DS100963-3
October 1999
54FCT138
1-of-8
Decoder/Demultiplexer
© 1999 National Semiconductor Corporation DS100963 www.national.com