SN54HCT139 Datasheet, PDF (1/5 Pages) Texas Instruments – DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS

SN54HCT139, SN74HCT139
DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS
D Inputs Are TTL-Voltage Compatible
D Designed Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
D Incorporate Two Enable Inputs to Simplify
Cascading and/or Data Reception
D Package Options Include Plastic
Small-Outline (D), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Ceramic Flat (W) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
SCLS066B – MARCH 1982 – REVISED MAY 1997
SN54HCT139 . . . J OR W PACKAGE
SN74HCT139 . . . D, DB, N, OR PW PACKAGE
(TOP VIEW)
1G ₁
1A 2
1B 3
1Y0 4
1Y1 5
1Y2 6
1Y3 7
GND 8
16 ^V_CC
15 2G
14 2A
13 2B
12 2Y0
11 2Y1
10 2Y2
9 2Y3
description
The ’HCT139 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
time 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.
The ’HCT139 comprise two individual 2-line to
4-line decoders in a single package. The
active-low enable (G) 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.
SN54HCT139 . . . FK PACKAGE
(TOP VIEW)
1B
3 2 1 20 19
4
18
2A
1Y0 5
17 2B
NC 6
16 NC
1Y1 7
15 2Y0
1Y2 8
14 2Y1
9 10 11 12 13
NC – No internal connection
The SN54HCT139 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74HCT139 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
SELECT
G
B
A
OUTPUTS
Y0 Y1 Y2 Y3
H
X
X
H
H
H
H
L
L
L
L
H
H
H
L
L
H
H
L
H
H
L
H
L
H
H
L
H
L
H
H
H
H
H
L
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.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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
Copyright © 1997, Texas Instruments Incorporated
1