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Applications:

Dual 2-to 4-Line Decoder

Dual 1-to 4-Line Demuiltiplexer

3-to 8-Line Decoder

1-to 8-Line Demultiplexer

Individual Strobes Simplify Cascading for

Decoding or Demuitiplexing Larger Words

Input Clamping Diodes Simplify System

Design

Choice of Outputs:

Totem Pole (“155, 'LS155A)

Open-Collector (156, ‘LS 156)

description

These monolithic transistor-transistor-logic (TTL) cir-

cuits 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 binary-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

1C is inverted at its outputs and data applied at 2Cis

not inverted through its outputs. The inverter fol-

lowing the 1C 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 all of

these circuits to minimize transmission-line effects

and simplify system design.