MC54HC688 データシートの表示（PDF） - Motorola => Freescale
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MC54HC688 Datasheet PDF : 6 Pages
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MC54/74HC688
TYPICAL APPLICATION
Two or more HC688 8–bit Equality Comparators may be cascaded to compare binary or BCD numbers having more than
8 bits. One method of accomplishing this is shown here.
An
HC688
An–1
A=B
8 MOST–
SIGNIFICANT
Bn
BITS
Bn–1
CASCADE
INPUT
HC688
A=B
CASCADE
INPUT
Ao
HC688
8 LEAST–
SIGNIFICANT
Bo
BITS
A=B
OUTPUT
CASCADE
INPUT
A7 17
B7
18
A6 15
B6
16
A5 13
B5
14
A4 11
B4
12
A3 8
B3
9
A2 6
B2
7
A1 4
B1
5
A0 2
B0
3
CASCADE 1
INPUT
EXPANDED LOGIC DIAGRAM
19 A = B
OUTPUT
MOTOROLA
4
High–Speed CMOS Logic Data
DL129 — Rev 6
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