Data Sheet

 
   
SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D Operating Voltage Range of 4.5 V to 5.5 V
D Outputs Can Drive Up To 10 LSTTL Loads
D Low Power Consumption, 80-µA Max I
CC
D Typical t
pd
= 17 ns
D ±4-mA Output Drive at 5 V
D Low Input Current of 1 µA Max
D Inputs Are TTL-Voltage Compatible
D Designed Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
D Incorporate Three Enable Inputs to Simplify
Cascading and/or Data Reception
3212019
910111213
4
5
6
7
8
18
17
16
15
14
Y1
Y2
NC
Y3
Y4
C
G
2A
NC
G
2B
G1
B A NC
Y6 Y5
V Y0
Y7
GND
NC
SN54HCT138 ...FK PACKAGE
(TOP VIEW)
CC
NC − No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A
B
C
G
2A
G
2B
G1
Y7
GND
V
CC
Y0
Y1
Y2
Y3
Y4
Y5
Y6
SN54HCT138 ...J OR W PACKAGE
SN74HCT138 . . . D, N, NS, OR PW PACKAGE
(TOP VIEW)
description/ordering information
The ’HCT138 devices are designed for high-performance memory-decoding or data-routing applications
requiring very short propagation delay times. In high-performance memory systems, these decoders can
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
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N Tube of 25 SN74HCT138N SN74HCT138N
Tube of 40 SN74HCT138D
SOIC − D
Reel of 2500 SN74HCT138DR
HCT138
−40°C to 85°C
SOIC − D
Reel of 250 SN74HCT138DT
HCT138
−40°C to 85°C
SOP − NS Reel of 2000 SN74HCT138NSR HCT138
Tube of 90 SN74HCT138PW
TSSOP − PW
Reel of 2000 SN74HCT138PWR
HT138
TSSOP − PW
Reel of 250 SN74HCT138PWT
HT138
CDIP − J Tube of 25 SNJ54HCT138J SNJ54HCT138J
−55°C to 125°C
CFP − W Tube of 150 SNJ54HCT138W SNJ54HCT138W
−55 C to 125 C
LCCC − FK Tube of 55 SNJ54HCT138FK SNJ54HCT138FK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright  2003, Texas Instruments Incorporated
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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