SN54HC42 Datasheet, PDF (1/6 Pages) Texas Instruments – 4-LINE TO 10-LINE DECODERS 1 of 10

D Full Decoding of Input Logic
D All Outputs Are High for Invalid BCD
Conditions
D Also for Applications as 3-Line to 8-Line
Decoders
D Package Options Include Plastic
Small-Outline (D) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (N) and Ceramic (J)
300-mil DIPs
description
These monolithic decimal decoders consist of
eight inverters and ten 4-input NAND gates. The
inverters are connected in pairs to make BCD
input data available for decoding by the NAND
gates. Full decoding of valid input logic ensures
that all inputs remain off for all invalid input
conditions.
The SN54HC42 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HC42 is characterized for
operation from –40°C to 85°C.
SN54HC42, SN74HC42
4-LINE TO 10-LINE DECODERS (1 of 10)
SCLS091B – DECEMBER 1982 – REVISED MAY 1997
SN54HC42 . . . J OR W PACKAGE
SN74HC42 . . . D OR N PACKAGE
(TOP VIEW)
0₁
12
23
34
45
56
67
GND 8
16 ^V_CC
15 A
14 B
13 C
12 D
11 9
10 8
97
SN54HC42 . . . FK PACKAGE
(TOP VIEW)
2
3 2 1 20 19
4
18
B
35
17 C
NC 6
16 NC
47
15 D
58
14 9
9 10 11 12 13
NC – No internal connection
FUNCTION TABLE
INPUTS
OUTPUTS
NO.
D
C
B
A
0
1
2
3
4
5
6
7
8
9
0
L
L
L
L
L
H
H
H
H
H
H
H
H
H
1
L
L
L
H
H
L
H
H
H
H
H
H
H
H
2
L
L
H
L
H
H
L
H
H
H
H
H
H
H
3
L
L
H
H
H
H
H
L
H
H
H
H
H
H
4
L
H
L
L
H
H
H
H
L
H
H
H
H
H
5
L
H
L
H
H
H
H
H
H
L
H
H
H
H
6
L
H
H
L
H
H
H
H
H
H
L
H
H
H
7
L
H
H
H
H
H
H
H
H
H
H
L
H
H
8
H
L
L
L
H
H
H
H
H
H
H
H
L
H
9
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
H
H
H
Invalid
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
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.
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.
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Copyright © 1997, Texas Instruments Incorporated
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