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5962-8768301FA Datasheet

  • 5962-8768301FA

  • DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS

  • 12頁(yè)

  • TI

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SN54ALS139, SN74ALS139
DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
SDAS204A 鈥?APRIL 1982 鈥?REVISED DECEMBER 1994
鈥?/div>
鈥?/div>
鈥?/div>
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
SN54ALS139 . . . J PACKAGE
SN74ALS139 . . . D OR N PACKAGE
(TOP VIEW)
description
The
鈥睞LS139
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.
1G
1A
1B
1Y0
1Y1
1Y2
1Y3
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
2G
2A
2B
2Y0
2Y1
2Y2
2Y3
SN54ALS139 . . . FK PACKAGE
(TOP VIEW)
1B
1Y0
NC
1Y1
1Y2
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
1A
1G
NC
V
CC
2G
2A
2B
NC
2Y0
2Y1
OUTPUTS
Y0
H
L
H
H
H
Y1
H
H
L
H
H
Y2
H
H
H
L
H
Y3
H
H
H
H
L
Copyright
漏
1994, Texas Instruments Incorporated
The
鈥睞LS139
comprise two individual 2-line to
4-line decoders in a single package. The
NC 鈥?No internal connection
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 鈥?55擄C to 125擄C. The
SN74ALS139 is characterized for operation from 0擄C to 70擄C.
FUNCTION TABLE
INPUTS
ENABLE
G
H
L
L
L
L
SELECT
B
X
L
L
H
H
A
X
L
H
L
H
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.
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1Y3
GND
NC
2Y3
2Y2
1

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