MC74ACT521 Motorola, MC74ACT521 Datasheet

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MC74ACT521

Manufacturer Part Number
MC74ACT521
Description
8-BIT IDENTITY COMPARATOR
Manufacturer
Motorola
Datasheet
www.DataSheet4U.com
DataSheet
8 Bit Identity Comparator
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 I A=B also serves as an
active LOW enable input.
PIN NAMES
A 0 –A 7
B 0 –B 7
I A=B
O A=B
4
TRUTH TABLE
H = HIGH Voltage Level
L = LOW Voltage Level
*A 0 =B 0 , A 1 =B 1 , A 2 =B 2 , etc.
Compares Two 8-Bit Words in 6.5 ns Typ
Expandable to Any Word Length
20-Pin Package
Outputs Source/Sink 24 mA
U
V CC
I A=B
ACT521 has TTL-Compatible Inputs
I A=B
The MC74AC521/74ACT521 is an expandable 8-bit comparator. It
20
1
H
H
L
L
.com
Inputs
O A=B
19
A 0
Word A Inputs
Word B Inputs
Expansion or Enable Input
Identity Output
2
A = B*
A = B*
A
A
A, B
B 7
18
B 0
3
B
B
A 7
17
A 1
4
Outputs
O A=B
H
H
H
L
B 6
16
B 1
5
A 6
15
A 2
6
B 5
14
B 2
7
A 5
A 3
13
8
B 4
B 3
12
9
GND
A 4
10
11
FACT DATA
I A=B
B 7 A 7 B 6 A 6 B 5 A 5 B 4 A 4 B 3 A 3 B 2 A 2 B 1 A 1 B 0 A 0
5-1
LOGIC SYMBOL
O A=B
MC74ACT521
MC74AC521
8-BIT IDENTITY
COMPARATOR
CASE 751D-04
CASE 738-03
DW SUFFIX
N SUFFIX
PLASTIC
PLASTIC

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MC74ACT521 Summary of contents

Page 1

... GND A=B FACT DATA 5-1 MC74AC521 MC74ACT521 8-BIT IDENTITY COMPARATOR N SUFFIX CASE 738-03 PLASTIC DW SUFFIX CASE 751D-04 PLASTIC LOGIC SYMBOL O A=B ...

Page 2

... Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. 4 DataSheet U .com MC74AC521 MC74ACT521 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. Parameter FACT DATA ...

Page 3

... All outputs loaded; thresholds on input associated with output under test. † Maximum test duration 2.0 ms, one output loaded at a time. Note and 3.0 V are guaranteed to be less than or equal to the respective limit @ 5 DataSheet U .com MC74AC521 MC74ACT521 Parameter ACT ...

Page 4

... Dynamic Output Current Output Current I OHD I CC Maximum Quiescent Supply Current Supply Current * All outputs loaded; thresholds on input associated with output under test. † Maximum test duration 2.0 ms, one output loaded at a time. 4 DataSheet U .com MC74AC521 MC74ACT521 Parameter Parameter (V) (V) 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5 ...

Page 5

... I A A=B * Voltage Range 5 5.0 V 0.5 V. CAPACITANCE Symbol C IN Input Capacitance C PD Power Dissipation Capacitance APPLICATIONS RIPPLE EXPANSION ENABLE LOW PARALLEL EXPANSION ENABLE LOW 4 DataSheet U .com MC74AC521 MC74ACT521 Parameter Parameter (V) (V) 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 Parameter ...

Page 6

... Motorola, Inc. Motorola, Inc Equal Opportunity/Affirmative Action Employer. How to reach us: USA/EUROPE: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 MFAX: RMFAX0@email.sps.mot.com –TOUCHTONE (602) 244–6609 INTERNET: http://Design–NET.com 4 DataSheet U .com MC74AC521 MC74ACT521 OUTLINE DIMENSIONS N SUFFIX PLASTIC DIP PACKAGE CASE 738–03 ISSUE ...

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