Page 1
TL/F/5959
CD4028BM/CD4028BC BCD-to-Decimal Decoder
February 1988
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
Logic and Connection Diagrams
TL/F/5959– 1
Dual-In-Line Package
TL/F/5959– 2
Top View
Order Number CD4028B
Truth Table
DCBA0123456789
0 0 0 01000000000
0 0 0 10100000000
0 0 1 00010000000
0 0 1 10001000000
0 1 0 00000100000
BCD States
0 1 0 10000010000
0 1 1 00000001000
1
e
High Level 0 1 1 1 0 0 0 0 0 0 0 1 0 0
0
e
Low Level 1 0 0 0 0 0 0 0 0 0 0 0 1 0
1 0 0 10000000001
-
1 0 1 00000000010
1 0 1 10000000001
1 1 0 00000000010
Extraordinary States
1 1 0 10000000001
1 1 1 00000000010
1 1 1 10000000001
*
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
Page 2
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
)
b
0.5 toa18V
Input Voltage (VIN)
b
0.5 to V
DD
a
0.5V
Storage Temperature Range (T
S
)
b
65§Ctoa150§C
Power Dissipation (PD)
Dual-In-Line 700 mW
Small Outline 500 mW
Lead Temperature (T
L
)
(Soldering, 10 seconds) 260
§
C
Recommended Operating
Conditions
(Note 2)
Supply Voltage (VDD) 3 to 15V
Input Voltage (VIN) 0 to VDDV
Operating Temperature Range (T
A
)
CD4028BM
b
55§Ctoa125§C
CD4028BC
b
40§Ctoa185§C
DC Electrical Characteristics CD4028BC (Note 2)
Symbol Parameter Conditions
b
55§C
a
25§C
a
125§C
Units
Min Max Min Typ Max Min Max
I
DD
Quiescent Device Current V
DD
e
5V, V
IN
e
VDDor V
SS
5 0.01 5 150 mA
V
DD
e
10V, V
IN
e
VDDor V
SS
10 0.01 10 300 mA
V
DD
e
15V, V
IN
e
VDDor V
SS
20 0.02 20 600 mA
V
OL
Low Level Output VoltagelI
O
l
k
1 mA, V
IL
e
0V, V
IH
e
V
DD
V
DD
e
5V 0.05 0 0.05 0.05 V
V
DD
e
10V 0.05 0 0.05 0.05 V
V
DD
e
15V 0.05 0 0.05 0.05 V
V
OH
High Level Output VoltagelI
O
l
k
1 mA, V
IL
e
0V, V
IH
e
V
DD
V
DD
e
5V 4.95 4.95 5 4.95 V
V
DD
e
10V 9.95 9.95 10 9.95 V
V
DD
e
15V 14.95 14.95 15 14.95 V
V
IL
Low Level Input VoltagelI
O
l
k
1 mA
V
DD
e
5V, V
O
e
0.5V or 4.5V 1.5 2.25 1.5 1.5 V
V
DD
e
10V, V
O
e
1V or 9V 3.0 4.5 3.0 3.0 V
V
DD
e
15V, V
O
e
1.5V or 13.5V 4.0 6.75 4.0 4.0 V
V
IH
High Level Input VoltagelI
O
l
k
1 mA
V
DD
e
5V, V
O
e
0.5V or 4.5V 3.5 3.5 2.75 3.5 V
V
DD
e
10V, V
O
e
1V or 9V 7.0 7.0 5.5 7.0 V
V
DD
e
15V, V
O
e
1.5V or 13.5V 11.0 11.0 8.25 11.0 V
I
OL
Low Level Output Current V
IL
e
0V, V
IH
e
V
DD
(Note 3) V
DD
e
5V, V
O
e
0.4V 0.64 0.51 1.0 0.36 mA
V
DD
e
10V, V
O
e
0.5V 1.6 1.3 2.6 0.9 mA
V
DD
e
15V, V
O
e
1.5V 4.2 3.4 6.8 2.4 mA
I
OH
High Level Output Current V
IL
e
0V, V
IH
e
V
DD
(Note 3) V
DD
e
5V, V
O
e
4.6V
b
0.25
b
0.2b0.4
b
0.14 mA
V
DD
e
10V, V
O
e
9.5V
b
0.62
b
0.5b1.0
b
0.35 mA
V
DD
e
15V, V
O
e
13.5V
b
1.8
b
1.5b3.0
b
1.1 mA
I
IN
Input Current V
DD
e
15V, V
IN
e
0V
b
0.1
b
10
b
5
b
0.1
b
1.0 mA
V
DD
e
15V, V
IN
e
15V 0.1 10
b
5
0.1 1.0 m A
DC Electrical Characteristics CD4028BC (Note 2)
Symbol Parameter Conditions
b
40§C
a
25§C
a
85§C
Units
Min Max Min Typ Max Min Max
I
DD
Quiescent Device Current V
DD
e
5V, V
IN
e
VDDor V
SS
20 0.01 20 150 mA
V
DD
e
10V, V
IN
e
VDDor V
SS
40 0.01 40 300 mA
V
DD
e
15V, V
IN
e
VDDor V
SS
80 0.02 80 600 mA
V
OL
Low Level Output VoltagelI
O
l
k
1 mA, V
IL
e
0V, V
IH
e
V
DD
V
DD
e
5V 0.05 0 0.05 0.05 V
V
DD
e
10V 0.05 0 0.05 0.05 V
V
DD
e
15V 0.05 0 0.05 0.05 V
2
Page 3
DC Electrical Characteristics CD4028BC (Note 2) (Continued)
Symbol Parameter Conditions
b
40§C
a
25§C
a
85§C
Units
Min Max Min Typ Max Min Max
V
OH
High Level Output VoltagelI
O
l
k
1 mA, V
IL
e
0V, V
IH
e
V
DD
V
DD
e
5V 4.95 4.95 5 4.95 V
V
DD
e
10V 9.95 9.95 10 9.95 V
V
DD
e
15V 14.95 14.95 15 14.95 V
V
IL
Low Level Input VoltagelI
O
l
k
1 mA
V
DD
e
5V, V
O
e
0.5V or 4.5V 1.5 2.25 1.5 1.5 V
V
DD
e
10V, V
O
e
1V or 9V 3.0 4.5 3.0 3.0 V
V
DD
e
15V, V
O
e
1.5V or 13.5V 4.0 6.75 4.0 4.0 V
V
IH
High Level Input VoltagelI
O
l
k
1 mA
V
DD
e
5V, V
O
e
0.5V or 4.5V 3.5 3.5 3.5 V
V
DD
e
10V, V
O
e
1V or 9V 7.0 7.0 7.0 V
V
DD
e
15V, V
O
e
1.5V or 13.5V 11.0 11.0 11.0 V
I
OL
Low Level Output Current V
IH
e
VDD,V
IL
e
0V
(Note 3) V
DD
e
5V, V
O
e
0.4V 0.52 0.44 0.88 0.36 mA
V
DD
e
10V, V
O
e
0.5V 1.3 1.1 2.2 0.9 mA
V
DD
e
15V, V
O
e
1.5V 3.6 3.0 6.0 2.4 mA
I
OH
High Level Output Current V
IH
e
VDD,V
IL
e
0V
(Note 3) V
DD
e
5V, V
O
e
4.6V
b
0.2
b
0.16b0.32
b
0.12 mA
V
DD
e
10V, V
O
e
9.5V
b
0.5
b
0.4b0.8
b
0.3 mA
V
DD
e
15V, V
O
e
13.5V
b
1.4
b
1.2b3.5
b
1.0 mA
I
IN
Input Current V
DD
e
15V, V
IN
e
0V
b
0.3
b
0.3
b
1.0 mA
V
DD
e
15V, V
IN
e
15V 0.3 0.3 1.0 mA
AC Electrical Characteristics*
T
A
e
25§C, C
L
e
50 pF, R
L
e
200k, Input t
r
e
t
f
e
20 ns, unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
t
PHL
or t
PLH
Propagation Delay Time V
CC
e
5V 240 480 ns
V
CC
e
10V 100 200 ns
V
CC
e
15V 70 140 ns
t
THL
or t
TLH
Transition Time V
CC
e
5V 175 350 ns
V
CC
e
10V 75 150 ns
V
CC
e
15V 60 110 ns
C
IN
Input Capacitance Any Input 5 7.5 pF
* AC Parameters are guaranteed by DC correlated testing.
Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed, they are not meant to imply that the devices
should be operated at these limits. The table of ‘‘Recommended Operating Conditions’’ and ‘‘Electrical Characteristics’’ provides conditions for actual device
operation.
Note 2: V
SS
e
0V unless otherwise specified.
Note 3: I
OL
and IOHare tested one output at a time.
Switching Time Waveforms
TL/F/5959– 3
3
Page 4
CD4028BM/CD4028BC BCD-to-Decimal Decoder
Physical Dimensions inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number CD4028BMJ or CD4028BCJ
NS Package Number J16A
Molded Dual-In-Line Package (N)
Order Number CD4028BMN or CD4028BCN
NS Package Number N16E
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failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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