54fct521 National Semiconductor Corporation, 54fct521 Datasheet

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54fct521

Manufacturer Part Number
54fct521
Description
8-bit Identity Comparator
Manufacturer
National Semiconductor Corporation
Datasheet

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© 1998 National Semiconductor Corporation
54FCT521
8-Bit Identity Comparator
General Description
The ’FCT521 is an expandable 8-bit comparator. It com-
pares two words of up to eight bits each and provides a LOW
output when the two words match bit for bit. The expansion
input I
Logic Symbols
FACT
is a trademark of Fairchild Semiconductor Corporation.
A = B
also serves as an active LOW enable input.
IEEE/IEC
DS100968-4
DS100968
DS100968-1
Features
n Expandable to any word length
n Outputs sink capability of 32mA, source capability of 12
n TTL input and output level compatible
n CMOS power consumption
n Standard microcircuit Drawing (SMD) 5962-8854301
Connection Diagram
Pin Descriptions
A
B
T
O
mA
A = B
0
0
A = B
–A
–B
Pin Names
7
7
for DIP and CERPACK
Pin Assignment
Pin Assignment
Word A Inputs
Word B Inputs
Expansion or Enable Input
Identity Output
for LCC
Description
DS100968-2
DS100968-3
September 1998
www.national.com

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54fct521 Summary of contents

Page 1

... Identity Comparator General Description The ’FCT521 is an expandable 8-bit comparator. It com- pares two words eight bits each and provides a LOW output when the two words match bit for bit. The expansion input I also serves as an active LOW enable input. ...

Page 2

Truth Table H = HIGH Voltage Level L = LOW Voltage Level = Note etc Logic Diagram Please note that this diagram ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Input Diode Current ( −0. ...

Page 4

AC Electrical Characteristics for ’FCT Family Devices Symbol Parameter t Propagation Delay PLH Propagation Delay PHL Propagation Delay ...

Page 5

Applications Ripple Expansion DS100968-6 Parallel Expansion DS100968-7 5 www.national.com ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted www.national.com 20-Lead Ceramic Leadless Chip Carrier Package Number E20A 6 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Ceramic Dual-in-line J20A 20-Lead Cerpack Package Number W20A 7 www.national.com ...

Page 8

LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices ...

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