DM54155/DM74155 Dual 2-Line to 4-Line Decoders/Demultiplexers
General Description
These TTL circuits feature dual 1-line-to-4-line demultiplexers with individual strobes and common
binary-address inputs in a single 16-pin package. When both sections are enabled by the strobes, the
common address inputs sequentially select and route associated input data to the appropriate
output of each section. The individual strobes permit activating or inhibiting each of the 4-bit sections
as desired. Data applied to input C1 is inverted at its outputs and data applied at C2 is true through its
outputs. The inverter following the C1 data input permits use as a 3-to-8-line decoder, or 1-to-8-line
demultiplexer, without external gating. Input clamping diodes are provided on these circuits to
minimize transmission-line effects and simplify system design.
Features
Applications:
Dual 2-to-4-line decoder
Dual 1-to-4-line demultiplexer
3-to-8-line decoder
1-to-8-line demultiplexer
Individual strobes simplify cascading for decoding or
demultiplexing larger words
Input clamping diodes simplify system design
Connection Diagram and Function Tables
Dual-In-Line Package
2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer
Outputs
Inputs
Select
Strobe
Data
BA
G1
C1
1Y0
1Y1
XX
H
X
H
H
1Y2
H
1Y3
H
1
2
