Fairchild MM74C154 service manual

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MM74C154
4-Line to 16-Line Decoder/Demultiplexer

MM74C154 4-Line to 16-Line Decoder/Demultiplexer

October 1987
Revised January 1999

General Description

The MM74C154 one of sixteen decoder is a monolithic
complementary MOS (CMOS) integrated circuit con­structed with N- and P-cha nnel enhancement transistors.
The device is provided with two strobe inputs, both of

which must be in th e logica l “0 ” state for nor ma l operatio n.
If either strobe input is in the logical “1” state, all 16 outputs
will go to the logical “1” state.

To use the product as a demult iplexer, one of the strobe
inputs serves as a data input terminal, while the other
strobe input must be maintained in the logical “0” state. The
information will then be transmitted to the selected output
as determined by the 4-line input address.

Features

■ Supply voltage range: 3V to 15V

■ Tenth power TTL compatible: Drive 2 LPTTL loads

■ High noise margin: 1V guaranteed

■ High noise immunity: 0.45 V

CC

(typ.)

Applications

• Automotive

• Data terminals

• Instrumentation

• Medical electronics

• Alarm systems

• Industrial electronics

• Remote metering

• Computers

Ordering Code:

Order Number Package Number Package Description

MM74C154WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
MM74C154N N24A 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600” Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” t o t he ordering code.

Connection Diagram

Pin Assignments for DIP and SOIC

Top View

© 1999 Fairchild Semiconductor Corporation DS005893.prf www.fairchildsemi.com

Logic Diagram

MM74C154

Truth Table

Inputs Outputs

G1G2DCBA0123456789101112131415

L L LLL LLHHHHHHHHH H H H H H H
L L L LLHHLHHHHHHHH H H H H H H
L L L LHLHHLHHHHHHH H H H H H H
L L L LHHHHHLHHHHHH H H H H H H
L L LHLLHHHHLHHHHH H H H H H H
L L LHLHHHHHHLHHHH H H H H H H
L L LHHLHHHHHHLHHH H H H H H H
L L LHHHHHHHHHHLHH H H H H H H
L L HL LLHHHHHHHHLH H H H H H H
L L HL LHHHHHHHHHHL H H H H H H
L L HLHLHHHHHHHHHH L H H H H H
L L HLHHHHHHHHHHHH H L H H H H
L L HHL LHHHHHHHHHH H H L H H H
L L HHLHHHHHHHHHHH H H H L H H
L L HHHLHHHHHHHHHH H H H H L H
L L HHHHHHHHHHHHHH H H H H H L
L H XXXXHHHHHHHHHH H H H H H H
H L XXXXHHHHHHHHHH H H H H H H
H H XXXXHHHHHHHHHH H H H H H H

X = “Don't Care” Conditi on

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