54act520 National Semiconductor Corporation, 54act520 Datasheet

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54act520

Manufacturer Part Number
54act520
Description
8-bit Identity Comparator
Manufacturer
National Semiconductor Corporation
Datasheet
© 1998 National Semiconductor Corporation
54AC520 • 54ACT520
8-Bit Identity Comparator
General Description
The ’AC/’ACT520 are expandable 8-bit comparators. They
compare two words of up to eight bits each and provide a
LOW output when the two words match bit for bit. The ex-
pansion input I
put.
Features
n Compares two 8-bit words in 6.5 ns typ
Logic Symbols
FACT
A
B
T
O
A = B
0
0
A = B
–A
–B
Pin Names
is a trademark of Fairchild Semiconductor Corporation.
7
7
A = B
also serves as an active LOW enable in-
Word A Inputs
Word B Inputs
Expansion or Enable Input
Identity Output
Description
DS100234
DS100234-1
n Expandable to any word length
n 20-pin package
n Outputs source/sink 24 mA
n ’ACT520 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
54AC520: 5962-90916
54ACT520: 5962-89793
IEEE/IEC
DS100234-4
September 1998
www.national.com

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54act520 Summary of contents

Page 1

... Identity Comparator General Description The ’AC/’ACT520 are expandable 8-bit comparators. They compare two words eight bits each and provide a LOW output when the two words match bit for bit. The ex- pansion input I also serves as an active LOW enable in put ...

Page 2

Connection Diagrams Pin Assignment for DIP and Flatpak DS100234-2 Truth Table Inputs HIGH Voltage Level L ...

Page 3

Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. DS100234-5 3 www.national.com ...

Page 4

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 5

DC Characteristics for ’AC Family Devices Symbol Parameter I Maximum Input IL Low Leakage Current I Minimum Dynamic OLD (Note 3) I Output Current OHD I Maximum Quiescent CC Supply Current I Maximum Quiescent CC Supply Current Note 2: All ...

Page 6

DC Characteristics for ’ACT Family Devices Symbol Parameter I Maximum Quiescent CC Supply Current Note 4: All outputs loaded; thresholds on input associated with output under test. Note 5: Maximum test duration 2.0 ms, one output loaded at a time. ...

Page 7

Applications Ripple Expansion DS100234-6 Parallel Expansion DS100234-7 7 www.national.com ...

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8 ...

Page 9

Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) 20 Lead Ceramic Dual-In-Line Package (D) NS Package Number E20A NS Package Number J20A 9 www.national.com ...

Page 10

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 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 ...

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