National Semiconductor CD4028BM, CD4028BC Service Manual
CD4028BM/CD4028BC BCD-to-Decimal Decoder
General Description
The CD4028BM/CD4028BC is a BCD-to-decimal or binaryto-octal decoder consisting of 4 inputs, decoding logic
gates, and 10 output buffers. A BCD code applied to the 4
inputs, A, B, C, and D, results in a high level at the selected
1-of-10 decimal decoded outputs. Similarly, a 3-bit binary
code applied to inputs A, B, and C is decoded in octal at
outputs 0 –7. A high level signal at the D input inhibits octal
decoding and causes outputs 0–7 to go low.
All inputs are protected against static discharge damage by
diode clamps to V
DD
and VSS.
Features
Y
Wide supply voltage range 3.0V to 15V
Y
High noise immunity 0.45 VDD(typ.)
Y
Low power TTL fan out of 2 driving 74L
compatibility or 1 driving 74LS
Y
Low power
Y
Glitch free outputs
Y
‘‘Positive logic’’ on inputs and outputs
Applications
Y
Code conversion
Y
Address decoding
Y
Indicator-tube decoder
CD4028BM/CD4028BC BCD-to-Decimal Decoder
February 1988
Logic and Connection Diagrams
Dual-In-Line Package
Top View
Order Number CD4028B
TL/F/5959– 1
TL/F/5959– 2
Truth Table
DCBA0123456789
0 0 0 01000000000
0 0 0 10100000000
0 0 1 00010000000
0 0 1 10001000000
0 1 0 00000100000
0 1 0 10000010000
e
High Level 0 1 1 1 0 0 0 0 0 0 0 1 0 0
1
e
Low Level 1 0 0 0 0 0 0 0 0 0 0 0 1 0
0
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
0 1 1 00000001000
1 0 0 10000000001
1 0 1 00000000010
1 0 1 10000000001
1 1 0 00000000010
1 1 0 10000000001
1 1 1 00000000010
1 1 1 10000000001
TL/F/5959
BCD States
-
Extraordinary States
*
Absolute Maximum Ratings (Notes1&2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
DD
)
Input Voltage (VIN)
Storage Temperature Range (T
)
S
b
0.5 toa18V
b
0.5 to V
DD
b
65§Ctoa150§C
a
0.5V
Power Dissipation (PD)
Dual-In-Line 700 mW
Small Outline 500 mW
Lead Temperature (T
(Soldering, 10 seconds) 260
)
L
C
§
DC Electrical Characteristics CD4028BC (Note 2)
Symbol Parameter Conditions
I
Quiescent Device Current V
DD
V
Low Level Output VoltagelI
OL
V
High Level Output VoltagelI
OH
V
Low Level Input VoltagelI
IL
V
High Level Input VoltagelI
IH
I
Low Level Output Current V
OL
(Note 3) V
I
High Level Output Current V
OH
(Note 3) V
I
Input Current V
IN
e
DD
e
V
DD
e
V
DD
k
1 mA, V
l
O
e
V
DD
e
V
DD
e
V
DD
k
1 mA, V
l
O
e
V
DD
e
V
DD
e
V
DD
k
1 mA
l
O
e
V
DD
e
V
DD
e
V
DD
k
1 mA
l
O
e
V
DD
e
V
DD
e
V
DD
e
IL
e
DD
e
V
DD
e
V
DD
e
IL
e
DD
e
V
DD
e
V
DD
e
DD
e
V
DD
e
5V, V
10V, V
15V, V
5V 0.05 0 0.05 0.05 V
IN
IN
IN
IL
VDDor V
e
VDDor V
e
VDDor V
e
0V, V
IH
10V 0.05 0 0.05 0.05 V
15V 0.05 0 0.05 0.05 V
e
0V, V
IL
5V 4.95 4.95 5 4.95 V
IH
10V 9.95 9.95 10 9.95 V
15V 14.95 14.95 15 14.95 V
e
5V, V
10V, V
15V, V
5V, V
10V, V
15V, V
0V, V
5V, V
10V, V
15V, V
0V, V
5V, V
10V, V
15V, V
15V, V
15V, V
0.5V or 4.5V 1.5 2.25 1.5 1.5 V
O
e
1V or 9V 3.0 4.5 3.0 3.0 V
O
e
1.5V or 13.5V 4.0 6.75 4.0 4.0 V
O
e
0.5V or 4.5V 3.5 3.5 2.75 3.5 V
O
e
1V or 9V 7.0 7.0 5.5 7.0 V
O
e
1.5V or 13.5V 11.0 11.0 8.25 11.0 V
O
e
V
IH
DD
e
0.4V 0.64 0.51 1.0 0.36 mA
O
e
0.5V 1.6 1.3 2.6 0.9 mA
O
e
1.5V 4.2 3.4 6.8 2.4 mA
O
e
V
IH
DD
e
4.6V
O
e
9.5V
O
e
13.5V
O
e
0V
IN
e
15V 0.1 10
IN
Recommended Operating
Conditions
Supply Voltage (VDD) 3 to 15V
Input Voltage (VIN) 0 to VDDV
Operating Temperature Range (T
CD4028BM
CD4028BC
b
55§C
Min Max Min Typ Max Min Max
SS
SS
SS
e
V
DD
e
V
DD
b
0.25
b
0.62
b
1.8
(Note 2)
)
A
b
55§Ctoa125§C
b
40§Ctoa185§C
a
25§C
a
5 0.01 5 150 mA
10 0.01 10 300 mA
20 0.02 20 600 mA
b
0.2b0.4
b
0.5b1.0
b
1.5b3.0
b
0.1
b
b
10
b
5
b
0.14 mA
b
0.35 mA
b
1.1 mA
5
b
0.1
0.1 1.0 m A
125§C
b
Units
1.0 mA
DC Electrical Characteristics CD4028BC (Note 2)
Symbol Parameter Conditions
I
DD
V
Quiescent Device Current V
Low Level Output VoltagelI
OL
e
DD
e
V
DD
e
V
DD
k
1 mA, V
l
O
e
V
DD
e
V
DD
e
V
DD
e
5V, V
10V, V
15V, V
5V 0.05 0 0.05 0.05 V
IN
IN
IN
IL
e
e
e
VDDor V
VDDor V
VDDor V
0V, V
IH
10V 0.05 0 0.05 0.05 V
15V 0.05 0 0.05 0.05 V
2
b
40§C
Min Max Min Typ Max Min Max
SS
SS
SS
e
V
DD
20 0.01 20 150 mA
40 0.01 40 300 mA
80 0.02 80 600 mA
a
25§C
a
85§C
Units
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