SN54HC138, SN74HC138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SCLS107E − DECEMBER 1982 − REVISED SEPTEMBER 2003
D
Targeted Specifically for High-Speed
D
D
D
D
D
D
D
Memory Decoders and Data-Transmission
Systems
Wide Operating Voltage Range of 2 V to 6 V
Outputs Can Drive Up To 10 LSTTL Loads
Low Power Consumption, 80-μA Max I
CC
Typical t
pd
= 15 ns
±4-mA
Output Drive at 5 V
Low Input Current of 1
μA
Max
Incorporate Three Enable Inputs to Simplify
Cascading and/or Data Reception
SN54HC138 . . . J OR W PACKAGE
SN74HC138 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
A
B
C
G2A
G2B
G1
Y7
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
Y0
Y1
Y2
Y3
Y4
Y5
Y6
description/ordering information
The ’HC138 devices are designed to be used in
high-performance memory-decoding or data-
routing applications requiring 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 are
usually less than the typical access time of the
memory. This means that the effective system
delay introduced by the decoders is negligible.
SN54HC138 . . . FK PACKAGE
(TOP VIEW)
B
A
NC
V
CC
Y0
C
G2A
NC
G2B
G1
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
Y1
Y2
NC
Y3
Y4
NC − No internal connection
ORDERING INFORMATION
T
A
PDIP − N
PACKAGE
†
Tube of 25
Tube of 40
SOIC − D
−40°C to 85°C
40 C 85 C
SOP − NS
SSOP − DB
Reel of 2500
Reel of 250
Reel of 2000
Reel of 2000
Tube of 90
TSSOP − PW
CDIP − J
−55°C to 125 C
55 C 125°C
†
ORDERABLE
PART NUMBER
SN74HC138N
SN74HC138D
SN74HC138DR
SN74HC138DT
SN74HC138NSR
SN74HC138DBR
SN74HC138PW
SN74HC138PWR
SN74HC138PWT
SNJ54HC138J
SNJ54HC138W
SNJ54HC138FK
Reel of 2000
Reel of 250
Tube of 25
Tube of 150
Tube of 55
CFP − W
LCCC − FK
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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
Y7
GND
NC
Y6
Y5
TOP-SIDE
MARKING
SN74HC138N
HC138
HC138
HC138
HC138
SNJ54HC138J
SNJ54HC138W
SNJ54HC138FK
1
TI [ TEXAS INSTRUMENTS ]
