ꢀꢁꢂ ꢃ ꢄꢅ ꢆ ꢇꢈ ꢉ ꢀꢁꢊ ꢃꢄ ꢅꢆ ꢇꢈ
ꢇ ꢋꢌ ꢍꢁꢎ ꢏ ꢐ ꢈ ꢋꢌ ꢍꢁꢎ ꢑꢎꢅ ꢐꢑ ꢎꢒꢀ ꢓ ꢑꢎ ꢔꢕꢌꢏꢍ ꢖ ꢌꢎ ꢗꢎ ꢒ ꢀ
SCLS107E − DECEMBER 1982 − REVISED SEPTEMBER 2003
SN54HC138 . . . J OR W PACKAGE
SN74HC138 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
D
Targeted Specifically for High-Speed
Memory Decoders and Data-Transmission
Systems
D
D
D
D
D
D
D
Wide Operating Voltage Range of 2 V to 6 V
Outputs Can Drive Up To 10 LSTTL Loads
A
B
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
Y0
Y1
Y2
C
Low Power Consumption, 80-µA Max I
CC
G2A
G2B
G1
Typical t = 15 ns
pd
4-mA Output Drive at 5 V
12 Y3
11
10
9
Y4
Y5
Y6
Low Input Current of 1 µA Max
Incorporate Three Enable Inputs to Simplify
Cascading and/or Data Reception
Y7
GND
SN54HC138 . . . FK PACKAGE
(TOP VIEW)
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.
3
2
1
20 19
18
Y1
Y2
NC
C
G2A
NC
4
5
6
7
8
17
16
15 Y3
14
9 10 11 12 13
G2B
G1
Y4
NC − No internal connection
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
SOIC − D
Tube of 25
Tube of 40
Reel of 2500
Reel of 250
Reel of 2000
Reel of 2000
Tube of 90
Reel of 2000
Reel of 250
Tube of 25
Tube of 150
Tube of 55
SN74HC138N
SN74HC138N
SN74HC138D
SN74HC138DR
SN74HC138DT
SN74HC138NSR
SN74HC138DBR
SN74HC138PW
SN74HC138PWR
SN74HC138PWT
SNJ54HC138J
HC138
SOP − NS
HC138
HC138
−40°C to 85°C
SSOP − DB
TSSOP − PW
HC138
CDIP − J
CFP − W
LCCC − FK
SNJ54HC138J
SNJ54HC138W
SNJ54HC138FK
SNJ54HC138W
SNJ54HC138FK
−55°C to 125°C
†
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.
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Copyright 2003, Texas Instruments Incorporated
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