N74F521D 查看數據表（PDF） - Philips Electronics
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N74F521D Datasheet PDF : 8 Pages
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Philips Semiconductors
8-bit identity comparator
Product specification
74F521
LOGIC DIAGRAM
A0 2
B0 3
A1 4
B1 5
A2 6
B2 7
A3 8
B3 9
A4 11
B4 12
A5 13
B5 14
A6 15
B6 16
A7 17
B7 18
IA=B 1
VCC = Pin 20
GND = Pin 10
APPLICATIONS
A0 B0
19 QA=B
FUNCTION TABLE
INPUTS
IA=B
L
A, B
A=B*
L
A≠B
H
A=B*
H
A≠B
H = High voltage level
L = Low voltage level
X = Don’t care
* A0=B0, A1=B1, A2=B2, etc.
OUTPUT
QA=B
L
H
H
H
SF00276
A7 B7
A8 B8
A15 B15
A16 B16
A23 B23
ENABLE
LOW
IA=B
QA=B
IA=B
QA=B
A0 B0
A7 B7
RIPPLE EXPANSION
A8 B8
A15 B15
IA=B
QA=B
A16 B16
A23 B23
ENABLE
LOW
IA=B
QA=B
IA=B
QA=B
IA=B
QA=B
May 15, 1990
PARALLEL EXPANSION
3
SF00277
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