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SN74ALS139DRE4 Fiches technique(PDF) 1 Page - Texas Instruments

No de pièce SN74ALS139DRE4
Description  DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

SN74ALS139DRE4 Fiches technique(HTML) 1 Page - Texas Instruments

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SN54ALS139, SN74ALS139
DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
SDAS204A – APRIL 1982 – REVISED DECEMBER 1994
Copyright
© 1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Designed Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
Incorporate Two Enable Inputs to Simplify
Cascading and /or Data Reception
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
The
′ALS139 are dual 2-line to 4-line
decoders/demultiplexers designed for use in
high-performance memory-decoding or data-
routing
applications
requiring
very
short
propagation delay times. In high-performance
memory systems, these devices can minimize the
effects of system decoding. When employed with
high-speed memories utilizing a fast-enable
circuit, the delay times of these decoders and the
enable time of the memory are usually less than
the typical access time of the memory. Therefore,
the effective system delay introduced by the
Schottky-clamped system decoder is negligible.
The
′ALS139 comprise two individual 2-line to
4-line decoders in a single package. The
active-low enable (G) input can be used as a data
line
in
demultiplexing
applications.
These
decoders/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its
driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line ringing and
simplify system design.
The SN54ALS139 is characterized for operation over the full military temperature range of – 55
°C to 125°C. The
SN74ALS139 is characterized for operation from 0
°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUTS
ENABLE
SELECT
OUTPUTS
ENABLE
G
B
A
Y0
Y1
Y2
Y3
H
X
X
H
H
H
H
L
L
LL
HH
H
L
L
HH
LH
H
L
H
LH
HLH
L
H
H
H
H
H
L
SN54ALS139 ...J PACKAGE
SN74ALS139 ...D OR N PACKAGE
(TOP VIEW)
3
2
1 20 19
910 11 12 13
4
5
6
7
8
18
17
16
15
14
2A
2B
NC
2Y0
2Y1
1B
1Y0
NC
1Y1
1Y2
SN54ALS139 . . . FK PACKAGE
(TOP VIEW)
NC – No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1G
1A
1B
1Y0
1Y1
1Y2
1Y3
GND
VCC
2G
2A
2B
2Y0
2Y1
2Y2
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.


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