Rainbow Electronics BU4028B User Manual
1
Standard ICs
BCD-to-decimal decoder
BU4028B
The BU4028B is a decoder which converts BCD signals to decimal signals.
Of the ten outputs Q
0 to Q9, those corresponding to the A to D input codes are set to “H”, and the others are all set to
“L”.
If inputs A to C are used and input D is used as disabled input, the BU4028B can also be used as a 1-of-8 decoder.
•
Features
1) Low power dissipation.
2) Wide range of operating power supply voltages.
3) High input impedance.
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1LS-TTL input.
•
Block diagram
Q2
Q4
Q8
Q7
Q9
Q5
Q6
Q0
B
C
D
A
Q
1
Q3
2
Q
2
Q4
Q7
Q9
Q5
Q6
Q0
3
4
5
6
7
8
15
14
13
12
11
10
9
V
SS
1
V
DD
B
C
IN
D
A
Q
1
Q3
Q8
16
•
Logic circuit diagram
A
B
C
D
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
2
Standard ICs BA4028B
•
Absolute maximum ratings (Ta = 25°C, VSS = 0V)
Parameter Symbol Limits Unit
Power supply voltage V
DD V
Power dissipation mW
Operating temperature – 40 ~ + 85
°C
Storage temperature – 55 ~ + 150 °C
Input voltage V
IN – 0.3 ~ VDD + 0.3 V
– 0.3 ~ + 18
1000 (DIP)Pd
Topr
Tstg
•
Truth table
INPUT OUTPUT
DCBAQ
9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
L
H
L
L
H
L
L
H
L
L
L
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
H
L
L
H
L
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
L
H
L
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
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