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National Semiconductor Electronic Components Datasheet

74F521 Datasheet

8-Bit Identity Comparator

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May 1995
54F 74F521
8-Bit Identity Comparator
General Description
The ’F521 is an expandable 8-bit comparator It compares
two words of up to eight bits each and provides a LOW
output when the two words match bit for bit The expansion
input IAeB also serves as an active LOW enable input
Features
Y Compares two 8-bit words in 6 5 ns typ
Y Expandable to any word length
Y 20-pin package
Commercial
74F521PC
74F521SC (Note 1)
74F521SJ (Note 1)
74F521MSA (Note 1)
Military
54F521DM (Note 2)
Package
Number
N20A
J20A
M20B
M20D
MSA20
Package Description
20-Lead (0 300 Wide) Molded Dual-In-Line
20-Lead Ceramic Dual-In-Line
20-Lead (0 300 Wide) Molded Small Outline JEDEC
20-Lead (0 300 Wide) Molded Small Outline EIAJ
20-Lead Molded Shrink Small Outline EIAJ type II
Note 1 Devices also available in 13 reel Use suffix e SCX SJX and MSAX
Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB
Logic Symbols
IEEE IEC
TL F 9545 – 1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9545
TL F 9545 – 4
RRD-B30M75 Printed in U S A


National Semiconductor Electronic Components Datasheet

74F521 Datasheet

8-Bit Identity Comparator

No Preview Available !

Unit Loading Fan Out
Pin Names
Description
A0 – A7
B0 – B7
IAeB
OAeB
Word A Inputs
Word B Inputs
Expansion or Enable Input (Active LOW)
Identity Output (Active LOW)
Truth Table
Inputs
IA e B
L
L
H
H
AB
AeB
AiB
AeB
AiB
Output
OA e B
L
H
H
H
54F 74F
UL
HIGH LOW
10 10
10 10
10 10
50 33 3
Input IIH IIL
Output IOH IOL
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
b1 mA 20 mA
H e HIGH Voltage Level
L e LOW Voltage Level
A0 e B0 A1 e B1 A2 e B2 etc
Connection Diagrams
Pin Assignment for DIP
SOIC SSOP and Flatpak
Logic Diagram
TL F 9545–2
Pin Assignment
for LCC
TL F 9545 – 5
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays
TL F 9545–3
2


Part Number 74F521
Description 8-Bit Identity Comparator
Maker National
Total Page 8 Pages
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