Texas Instruments 74 AC 11239 INSTALLATION INSTRUCTIONS
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74AC11239
DUAL 2–LINE TO 4–LINE DECODER/DEMULTIPLEXER
SCAS072A – JULY 1989 – REVISED APRIL 1993
• Designed Specifically for High-Speed
Memory Decoders and Data Transmission
D OR N PACKAGE
(TOP VIEW)
Systems
• Incorporates Two Enable Inputs to Simplify
Cascading and/or Data Reception
• Flow-Through Architecture to Optimize
PCB Layout
• Center-Pin V
Minimize High-Speed Switching Noise
• EPIC
t
(Enhanced-Performance Implanted
and GND Configurations to
CC
1Y1
1Y2
1Y3
GND
2Y0
2Y1
2Y2
2Y3
1
2
3
4
5
6
7
8
15
14
13
12
11
10
1Y0
1A
1B
1G
V
CC
2G
2A
9
2B
16
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 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 ef fective system delay introduced by the decoder
is negligible.
The 74AC1 1239 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
G
H X X L L L L
L L LHLLL
L H LLHLL
L L HLLHL
L H H L L L H
SELECT INPUTS OUTPUTS
A B Y0 Y1 Y2 Y3
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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
Copyright 1993, Texas Instruments Incorporated
1
• HOUSTON, TEXAS 77251–1443
74AC11239
DUAL 2–LINE TO 4–LINE DECODER/DEMULTIPLEXER
SCAS072A – JULY 1989 – REVISED APRIL 1993
†
logic symbols
(alternatives)
15
1A
14
1B
13
1G
10
2A
9
2B
11
2G
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
0
1
EN
X/Y
16
0
1
2
3
1Y0
1
1Y1
2
1Y2
3
1Y3
5
2Y0
6
2Y1
7
2Y2
8
2Y3
1A
1B
1G
2A
2B
2G
15
14
13
10
9
11
logic diagram (positive logic)
1A
1B
13
15
14
Enable 1G
Select Inputs
16
DMUX
0
0
G
3
1
1Y0
1
1Y1
2
1Y2
3
1Y3
Data Outputs
5
2Y0
0
1
2
3
16
1Y0
1
1Y1
2
1Y2
3
1Y3
5
2Y0
6
2Y1
7
2Y2
8
2Y3
Enable 2G
Select
2A
2B
11
10
9
6
2Y1
7
2Y2
8
2Y3
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
74AC11239
DUAL 2–LINE TO 4–LINE DECODER/DEMULTIPLEXER
SCAS072A – JULY 1989 – REVISED APRIL 1993
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
Input voltage range, VI (see Note 1) –0.5 V to VCC+ 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, VO (see Note 1) –0.5 V to VCC+ 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
Output clamp current, I
Continuous output current, I
(V
< 0 or VI > VCC) ± 20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
I
(V
OK
< 0 or VO > VCC) ± 50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
(V
= 0 to VCC) ± 50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
O
Continuous current through VCC or GND ± 200 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
recommended operating conditions
MIN NOM MAX UNIT
V
V
V
V
V
I
I
Dt/D
T
Supply voltage 3 5 5.5 V
CC
VCC = 3 V 2.1
High-level input voltage
IH
Low-level input voltage
IL
Input voltage 0 V
I
Output voltage 0 V
O
High-level output current
OH
Low-level output current
OL
v Input transition rise or fall rate 0 10 ns/V
Operating free-air temperature –40 85 °C
A
VCC = 4.5 V
VCC = 5.5 V 3.85
VCC = 3 V 0.9
VCC = 4.5 V
VCC = 5.5 V 1.65
VCC = 3 V –4
VCC = 4.5 V
VCC = 5.5 V –24
VCC = 3 V 12
VCC = 4.5 V
VCC = 5.5 V 24
3.15
1.35
CC
CC
–24
24
V
V
V
V
mA
mA
†
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
3
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