74AC11239 Datasheet, PDF (1/7 Pages) NXP Semiconductors – DUAL 2 TO 4 LINE DECODER/DEMULTIPLEXER, ACTIVE HIGH

74AC11239
DUAL 2–LINE TO 4–LINE DECODER/DEMULTIPLEXER
• Designed Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
• Incorporates Two Enable Inputs to Simplify
Cascading and/or Data Reception
• Flow-Through Architecture to Optimize
PCB Layout
• Center-Pin V_CC and GND Configurations to
Minimize High-Speed Switching Noise
t • EPIC (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
SCAS072A – JULY 1989 – REVISED APRIL 1993
D OR N PACKAGE
(TOP VIEW)
1Y1 1
1Y2 2
1Y3 ³
GND ⁴
2Y0 ⁵
2Y1 ⁶
2Y2 ⁷
2Y3 ⁸
16 1Y0
15 1A
14 1B
13 1G
12 _VCC
11 _2G
10 _2A
9 _2B
description
The 74AC11239 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 74AC11239 is comprised of two individual two-line to four-line decoders in a single package. The active-low
enable 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.
The 74AC11239 is characterized for operation from – 40°C to 85°C.
FUNCTION TABLE
ENABLE INPUT ^{SELECT INPUTS}
OUTPUTS
G
A
B
Y0 Y1 Y2 Y3
H
X
X
L
L
L
L
L
L
L
H
L
L
L
L
H
L
L
H
L
L
L
L
H
L
L
H
L
L
H
H
L
L
L
H
EPIC is a trademark of Texas Instruments Incorporated.
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 © 1993, Texas Instruments Incorporated
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