MC74HC688 Motorola, MC74HC688 Datasheet - Page 4

• Manufacturer Part Number: MC74HC688
• Description: 8-Bit Equality Comparator
• Manufacturer: Motorola

MOTOROLA
8 bits. One method of accomplishing this is shown here.
MC54/74HC688
Two or more HC688 8–bit Equality Comparators may be cascaded to compare binary or BCD numbers having more than
A n
B n
SIGNIFICANT
8 MOST–
HC688
BITS
CASCADE
INPUT
CASCADE
INPUT
A7
B7
A6
B6
A5
B5
A4
B4
A2
B2
A1
B1
A0
B0
A3
B3
17
18
15
16
13
14
11
12
8
9
6
7
4
5
2
3
1
A = B
A n–1
B n–1
EXPANDED LOGIC DIAGRAM
TYPICAL APPLICATION
HC688
CASCADE
INPUT
4
A = B
Ao
B o
SIGNIFICANT
8 LEAST–
HC688
BITS
19
High–Speed CMOS Logic Data
CASCADE
INPUT
OUTPUT
A = B
DL129 — Rev 6
OUTPUT
A = B