SN74ALS155 Datasheet, PDF (1/4 Pages) Texas Instruments – DUAL 2-LINE TO 4-LINE DECODER/DEMULTIPLEXER

SN74ALS155
DUAL 2-LINE TO 4-LINE DECODER/DEMULTIPLEXER
• Applications:
Dual 2-Line to 4-Line Decoder
Dual 1-Line to 4-Line Demultiplexer
3-Line to 8-Line Decoder
1-Line to 8-Line Demultiplexer
• Individual Strobes Simplify Cascading For
Decoding or Demultiplexing Larger Words
• Package Options Include Plastic “Small
Outline” Packages and Standard Plastic
300-mil DIPs
description
The ′ALS155 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, the
common binary-address inputs sequentially
select and route associated input data to the
appropriate output of each section. The individual
strobes permit enabling or disabling each of the
4-bit sections as desired.
Data applied to input 1C is inverted at its outputs
and data applied at input 2C is not inverted
through its outputs. The inverter following the 1C
data input permits use of the ′ALS155 as a 3-line
to 8-line demultiplexer without external gating. All
inputs are clamped with high-performance
Schottky diodes to suppress line ringing and
simplify system design.
The SN74ALS155 is characterized for operation
from 0°C to 70°C.
SDAS140 — NOVEMBER 1987
D or N Package
(Top View)
1C 1
1G 2
B3
1Y3 4
1Y2 5
1Y1 6
1Y0 7
GND 8
16 V_CC
15 2C
14 2G
13 A
12 2Y3
11 2Y2
10 2Y1
9 2Y0
logic diagram (positive logic)
STROBE 2
1G
DATA 1
1C
SELECT 3
B
SELECT 13
A
DATA 15
2C
STROBE 14
1G
7 _OUTPUT
1Y0
6 _OUTPUT
1Y1
5 _OUTPUT
1Y2
4 _OUTPUT
1Y3
9 _OUTPUT
2Y0
10 _OUTPUT
2Y1
11 _OUTPUT
2Y2
12 _OUTPUT
2Y3
PRODUCTION DATA information is current as of
publication date. Products conform to specifications
per the terms of Texas Instruments standard
warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1987, Texas Instruments Incorporated
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