2
Functional Diagram
TRUTH TABLE
INPUTS OUPUTS
A, B EY
A = B L L
A ≠ BL H
XH H
H = High Voltage Level, L = Low Voltage Level, X = Don’t Care
2
4
6
8
13
17
15
11
A0
A7
A6
A5
A4
A3
A2
A1
3
B0
5
B1
7
B2
9
12
14
16
18
B3
B4
B5
B6
19
Y
B7
E
1
CD54HC688, CD74HC688, CD54HCT688, CD74HCT688