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74ACT11238 数据表(PDF) 1 Page - Texas Instruments

部件名 74ACT11238
功能描述  3-LINE TO 8-LINE DECODER/DEMULTIPLEXER
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

74ACT11238 数据表(HTML) 1 Page - Texas Instruments

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74ACT11238
3LINE TO 8LINE DECODER/DEMULTIPLEXER
SCAS054 − NOVEMBER 1988 − REVISED APRIL 1993
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77001
Copyright
1993, Texas Instruments Incorporated
2−1
Designed Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
Noninverting Version of ′ACT11138
Incorporates 3 Enable Inputs to Simplify
Cascading and/or Data Reception
Inputs Are TTL-Voltage Compatible
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin V
CC and GND Configurations
Minimize High-Speed Switching Noise
EPICt (Enhanced-Performance Implanted
CMOS) 1-
mm Process
500-mA Typical Latch-Up Immunity
at 125
°C
Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
description
The 74ACT11238 circuit is designed to be used in high-performance memory-decoding or data-routing
applications requiring very short propagation delay times. In high-performance memory systems, this decoder
can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing
a fast enable circuit, the delay times of this decoder and the enable time of the memory are usually less than
the typical access time of the memory. This means that the effective system delay introduced by the decoder
is negligible.
The conditions at the binary select inputs and the three enable inputs select one of eight input lines. Two
active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding.
A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one
inverter. An enable input can be used as a data input for demultiplexing applications.
The 74ACT11238 is characterized for operation from − 40
°C to 85°C.
FUNCTION TABLE
ENABLE
SELECT
OUTPUTS
ENABLE
INPUTS
SELECT
INPUTS
OUTPUTS
G1
G2A
G2B
C
B
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
H
X
X
X
X
L
L
L
L
L
L
L
L
X
XH
X
XX
L
LL
LL
LL
L
L
XX
X
XX
L
LL
LL
LL
L
H
LL
L
LL
H
LL
LL
LL
L
H
LL
L
LH
L
H
L
LL
LL
L
H
LL
L
HL
L
L
H
LL
LL
L
H
LL
L
HH
L
LL
H
L
LL
L
H
LL
H
LL
L
LL
L
H
LL
L
H
LL
H
LH
L
LL
LL
H
L
L
H
LL
H
HL
L
LL
LL
L
H
L
H
L
L
H
H
H
L
L
L
L
L
L
L
H
D OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Y1
Y2
Y3
GND
Y4
Y5
Y6
Y7
Y0
A
B
C
VCC
G1
G2A
G2B
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.
EPIC is a trademark of Texas Instruments Incorporated.


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