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 Q
9
, those corresponding to the A to D input codes are set to 鈥淗鈥? and the others are all set to
鈥淟鈥?
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.
鈥?/div>
Features dissipation.
1) Low power
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.
鈥?/div>
Block diagram
Q
4
1
16 V
DD
15 Q
3
Q
4
Q
2
Q
0
3
Q
0
Q
7
4
Q
7
Q
9
Q
5
Q
5
Q
6
6
Q
6
Q
8
7
10 A
9
Q
8
Q
1
B
C
D
A
11 D
13 B
Q
3
14 Q
1
Q
2
2
鈥?/div>
Logic circuit diagram
Q
0
Q
1
A
B
Q
4
Q
5
C
Q
6
Q
7
IN
D
Q
8
Q
9
Q
2
Q
3
Q
9
5
12 C
V
SS
8
1
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