SN54AHC138, SN74AHC138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SCLS258L – DECEMBER 1995 – REVISED JULY 2003
Operating Range 2-V to 5.5-V V
Latch-Up Performance Exceeds 250 mA Per
JESD 17
CC
Designed Specifically for High-Speed
Memory Decoders and Data-Transmission
Systems
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
Incorporate Three Enable Inputs to Simplify
Cascading and/or Data Reception
– 1000-V Charged-Device Model (C101)
SN54AHC138 . . . J OR W PACKAGE
SN74AHC138 . . . D, DB, DGV, N, NS,
OR PW PACKAGE
SN74AHC138 . . . RGY PACKAGE
(TOP VIEW)
SN54AHC138 . . . FK PACKAGE
(TOP VIEW)
(TOP VIEW)
1
16
A
B
V
CC
15 Y0
1
2
3
4
5
6
7
8
16
3
2
1 20 19
18
Y1
C
G2A
NC
4
5
6
7
8
B
C
G2A
G2B
G1
15
14
13
12
11
10
2
3
4
5
6
7
Y0
Y1
Y2
Y3
Y4
Y5
17 Y2
16
14
C
Y1
NC
13
12
11
10
9
G2A
G2B
G1
Y2
Y3
Y4
Y5
Y6
15
Y3
G2B
G1
14
Y4
9 10 11 12 13
Y7
Y7
8
9
GND
NC – No internal connection
description/ordering information
The ’AHC138 decoders/demultiplexers are designed for high-performance memory-decoding and data-routing
applications that require very short propagation-delay times. In high-performance memory systems, these
decoders 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 these decoders and the enable time of the memory usually are
less than the typical access time of the memory. This means that the effective system delay introduced by the
decoders is negligible.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
QFN – RGY
PDIP – N
Tape and reel
Tube
SN74AHC138RGYR
SN74AHC138N
HA138
SN74AHC138N
Tube
SN74AHC138D
SOIC – D
AHC138
Tape and reel
SN74AHC138DR
–40°C to 85°C
SOP – NS
Tape and reel
Tape and reel
Tube
SN74AHC138NSR
SN74AHC138DBR
SN74AHC138PW
SN74AHC138PWR
SN74AHC138DGVR
SNJ54AHC138J
AHC138
HA138
SSOP – DB
TSSOP – PW
HA138
Tape and reel
Tape and reel
Tube
TVSOP – DGV
CDIP – J
HA138
SNJ54AHC138J
SNJ54AHC138W
SNJ54AHC138FK
–55°C to 125°C
CFP – W
Tube
SNJ54AHC138W
SNJ54AHC138FK
LCCC – FK
Tube
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2003, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
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.
1
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