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参数资料
| 型号： | MM74HC42 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | BCD-to-Decimal Decoder |
| 中文描述： | BCD码到十进制解码器 |
| 文件页数： | 1/4页 |
| 文件大小： | 149K |
| 代理商： | MM74HC42 |
TL/F/5301
M
January 1988
MM54HC42/MM74HC42
BCD-to-Decimal Decoder
General Description
This decoder utilizes advanced silicon-gate CMOS technol-
ogy. Data on the four input pins select one of the 10 outputs
corresponding to the value of the BCD number on the in-
puts. An output will go low when selected, otherwise it re-
mains high. If the input data is not a valid BCD number all
outputs will remain high. The circuit has high noise immunity
and low power consumption usually associated with CMOS
circuitry, yet also has speeds comparable to low power
Schottky TTL (LS-TTL) circuits, and is capable of driving 10
LS-TTL equivalent loads.
All inputs are protected from damage due to static dis-
charge by diodes to V
CC
and ground.
Features
Y
Typical propagation delay: 15 ns
Y
Wide supply range: 2V–6V
Y
Low quiescent current: 80
m
A (74HC)
Y
Fanout of 10 LS-TTL loads
Connection Diagram
Dual-in-line Package
TL/F/5301–1
Top View
Order Number MM54HC42 or MM74HC42
Logic Diagram
Truth Table
No.
Inputs
D C B A
L
L
L
L
L
L
L
L
L
H
L
H
L
H H
L
H H H H H H H H H H
H
L
L
L
H H H H H H H H
H
L
L
H H H H H H H H H H
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
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
Outputs
4
0
L
1
H H H H H H H H H
L
H H H H H H H H
H H
L
H H H H H H H
H H H H H
L
L
L
H H H H
L
H H H H H H
L
H H H H H H
2
3
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
L
L
H
L
H H
L
H H H H H H
L
H H H H H
L
H H H H
L
H H H
L
H H
L
H
L
INVALID
H
e
High Level, L
e
Low Level
TL/F/5301–2
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
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