CD74HC42,
CD74HCT42
Data sheet acquired from Harris Semiconductor
SCHS133
High Speed CMOS Logic
August 1997
BCD To Decimal Decoder (1 of 10)
Features
Description
• Buffered Inputs and Outputs
The Harris CD74HC42, CH74HCT42 BCD-to-Decimal
Decoders utilize silicon-gate CMOS technology to achieve
operating speeds similar to LSTTL decoders with the low
power consumption of standard CMOS integrated circuits.
These devices have the capability of driving 10 LSTLL loads
and are compatible with the standard 74LS logic family. One
of ten outputs (low on select) is selected in accordance with
the BCD input. Non-valid BCD inputs result in none of the
• Typical Propagation Delay: 12ns at V
o
= 5V,
[ /Title
(CD74H
C42,
CC
C = 15pF, T = 25 C
L
A
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
CD74H
CT42)
/Subject
(High
Speed
CMOS
Logic
o
o
• Wide Operating Temperature Range . . . -55 C to 125 C outputs being selected (all outputs are high).
• Balanced Propagation Delay and Transition Times
Ordering Information
• Significant Power Reduction Compared to LSTTL
Logic ICs
PKG.
NO.
o
PART NUMBER TEMP. RANGE ( C) PACKAGE
• HC Types
BCD To
Deci-
CD74HC42E
CD74HCT42E
CD74HC42M
NOTES:
-55 to 125
-55 to 125
-55 to 125
16 Ld PDIP
16 Ld PDIP
E16.3
E16.3
- 2V to 6V Operation
- High Noise Immunity: N = 30%, N = 30% of V
IL IH CC
at V
= 5V
CC
16 Ld SOIC M16.15
• HCT Types
- 4.5V to 5.5V Operation
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
- Direct LSTTL Input Logic Compatibility,
V = 0.8V (Max), V = 2V (Min)
IL IH
2. Die for this part number is available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.
- CMOS Input Compatibility, I ≤ 1µA at V , V
OL OH
l
Pinout
CD74HC42, CD74HCT42
(PDIP, SOIC)
TOP VIEW
Y0
Y1
1
2
3
4
5
6
7
8
16 V
CC
15 A0
14 A1
13 A2
12 A3
11 Y9
10 Y8
Y2
Y3
Y4
Y5
Y6
9
Y7
GND
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
File Number 1689.1
Copyright © Harris Corporation 1997
1