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參數(shù)資料
| 型號： | SN54ALS139FK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS |
| 中文描述： | 雙程線，4線解碼器/解復(fù)用器 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大小： | 486K |
| 代理商： | SN54ALS139FK |
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
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.
requiring
very
short
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
G
SELECT
B
X
A
X
Y0
H
Y1
H
Y2
H
Y3
H
H
L
L
L
L
H
H
H
L
L
H
H
L
H
H
L
H
L
H
H
L
H
L
H
H
H
H
H
L
SN54ALS139 . . . J PACKAGE
SN74ALS139 . . . D OR N PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 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)
1
1
N
2
2
2
1
G
N
NC – No internal connection
V
C
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1G
1A
1B
1Y0
1Y1
1Y2
1Y3
GND
V
CC
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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相關(guān)代理商/技術(shù)參數(shù) |
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| SN54ALS153J | 制造商:Texas Instruments 功能描述:Multiplexer 1-Element Bipolar 8-IN 16-Pin CDIP Tube 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| SN54ALS163BJ | 制造商:Texas Instruments 功能描述:4-BIT SYNC BINARY COUNTER - Rail/Tube |
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