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Fairchild Semiconductor
Fairchild Semiconductor

7442 Datasheet

BCD to Decimal Decoder


7442 Datasheet Preview


August 1986
Revised February 2000
DM7442A
BCD to Decimal Decoder
General Description
These BCD-to-decimal decoders consist of eight inverters
and ten, four-input NAND gates. The inverters are con-
nected in pairs to make BCD input data available for
decoding by the NAND gates. Full decoding of input logic
ensures that all outputs remain off for all invalid (10–15)
input conditions.
Features
s Diode clamped inputs
s Also for application as 4-line-to-16-line decoders;
3-line-to-8-line decoders
s All outputs are high for invalid input conditions
s Typical power dissipation 140 mW
s Typical propagation delay 17 ns
Ordering Code:
Order Number Package Number
Package Description
DM7442AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram
© 2000 Fairchild Semiconductor Corporation DS006516
www.fairchildsemi.com
Page 1

Function Table
No. BCD Input
Decimal Output
DCBA 0 1 2 3 4 5 6 7 8 9
0 L L L L LHHHHHHHHH
1 L L LHH LHHHHHHHH
2 L LHLHHLHHHHHHH
3 L LHHHHH LHHHHHH
4 LH L LHHHH LHHHHH
5 LH LHHHHHHLHHHH
6 LHHLHHHHHH LHHH
7 LHHHHHHHHHH LHH
8H L L LHHHHHHHHLH
9H L LHHHHHHHHHH L
I H LHLHHHHHHHHHH
NH LHHHHHHHHHHHH
VHH L LHHHHHHHHHH
AHH LHHHHHHHHHHH
L HHH L HHHHHHHHHH
I HHHHHHHHHHHHHH
D
H = HIGH Level
L = LOW Level
Logic Diagram
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2
Page 2

Absolute Maximum Ratings(Note 1)
Supply Voltage
7V
Input Voltage
5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
65°C to +150°C
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
Min
4.75
2
0
Nom
5
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
VI Input Clamp Voltage
VOH HIGH Level
Output Voltage
VOL LOW Level
Output Voltage
II Input Current @ Max Input Voltage
IIH HIGH Level Input Current
IIL LOW Level Input Current
IOS Short Circuit Output Current
ICC Supply Current
VCC = Min, II = −12 mA
VCC = Min, IOH = Max
VIL = Max, VIH = Min
VCC = Min, IOL = Max
VIH = Min, VIL = Max
VCC = Max, VI = 5.5V
VCC = Max, VI = 2.4V
VCC = Max, VI = 0.4V
VCC = Max (Note 3)
VCC = Max (Note 4)
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time.
Note 4: ICC is measured with all outputs open and all inputs grounded.
Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol
Parameter
tPHL Propagation Delay Time
HIGH-to-LOW Level Output
from A, B, C or D through
2 Levels of Logic
tPHL Propagation Delay Time
HIGH-to-LOW Level Output
from A, B, C or D through
3 Levels of Logic
tPLH Propagation Delay Time
LOW-to-HIGH Level Output
from A, B, C or D through
2 Levels of Logic
tPLH Propagation Delay Time
LOW-to-HIGH Level Output
from A, B, C or D through
3 Levels of Logic
CL = 15 pF
RL = 400
Conditions
Max
Units
5.25
V
V
0.8 V
0.8
mA
16 mA
70 °C
Typ
Min Max
(Note 2)
1.5
2.4 3.4
Units
V
V
0.2 0.4
V
1 mA
40 µA
1.6
mA
18 55 mA
28 56 mA
Min
Max
Units
25 ns
30 ns
25 ns
30 ns
3 www.fairchildsemi.com
Page 3

Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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4
Page 4
Part Number 7442
Manufactur Fairchild Semiconductor
Description BCD to Decimal Decoder
Total Page 4 Pages
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