TL F 9545
54F74F521
8-Bit
Identity
Comparator
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 I
AeB
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
Military
Package
Package Description
Number
74F521PC
N20A
20-Lead (0 300 Wide) Molded Dual-In-Line
54F521DM (Note 2)
J20A
20-Lead Ceramic Dual-In-Line
74F521SC (Note 1)
M20B
20-Lead (0 300 Wide) Molded Small Outline JEDEC
74F521SJ (Note 1)
M20D
20-Lead (0 300 Wide) Molded Small Outline EIAJ
74F521MSA (Note 1)
MSA20
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
TL F 9545 1
IEEE IEC
TL F 9545 4
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M75 Printed in U S A
Unit Loading Fan Out
54F 74F
Pin Names
Description
U L
Input I
IH
I
IL
HIGH LOW
Output I
OH
I
OL
A
0
A
7
Word A Inputs
1 0 1 0
20 mA
b
0 6 mA
B
0
B
7
Word B Inputs
1 0 1 0
20 mA
b
0 6 mA
I
AeB
Expansion or Enable Input (Active LOW)
1 0 1 0
20 mA
b
0 6 mA
O
AeB
Identity Output (Active LOW)
50 33 3
b
1 mA 20 mA
Truth Table
Inputs
Output
I
A e B
A B
O
A e B
L
A
e
B
L
L
A
i
B
H
H
A
e
B
H
H
A
i
B
H
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
A
0
e
B
0
A
1
e
B
1
A
2
e
B
2
etc
Connection Diagrams
Pin Assignment for DIP
SOIC SSOP and Flatpak
TL F 9545 2
Pin Assignment
for LCC
TL F 9545 3
Logic Diagram
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
2
Absolute Maximum Ratings
(Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Storage Temperature
b
65 C to
a
150 C
Ambient Temperature under Bias
b
55 C to
a
125 C
Junction Temperature under Bias
b
55 C to
a
175 C
Plastic
b
55 C to
a
150 C
V
CC
Pin Potential to
Ground Pin
b
0 5V to
a
7 0V
Input Voltage (Note 2)
b
0 5V to
a
7 0V
Input Current (Note 2)
b
30 mA to
a
5 0 mA
Voltage Applied to Output
in HIGH State (with V
CC
e
0V)
Standard Output
b
0 5V to V
CC
TRI-STATE Output
b
0 5V to
a
5 5V
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(mA)
Note 1
Absolute maximum ratings are values beyond which the device may
be damaged or have its useful life impaired Functional operation under
these conditions is not implied
Note 2
Either voltage limit or current limit is sufficient to protect inputs
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
b
55 C to
a
125 C
Commercial
0 C to
a
70 C
Supply Voltage
Military
a
4 5V to
a
5 5V
Commercial
a
4 5V to
a
5 5V
DC Electrical Characteristics
Symbol
Parameter
54F 74F
Units
V
CC
Conditions
Min
Typ
Max
V
IH
Input HIGH Voltage
2 0
V
Recognized as a HIGH Signal
V
IL
Input LOW Voltage
0 8
V
Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage
b
1 2
V
Min
I
IN
e b
18 mA
V
OH
Output HIGH
54F 10% V
CC
2 5
I
OH
e b
1 mA
Voltage
74F 10% V
CC
2 5
V
Min
I
OH
e b
1 mA
74F 5% V
CC
2 7
I
OH
e b
1 mA
V
OL
Output LOW
54F 10% V
CC
0 5
V
Min
I
OL
e
20 mA
Voltage
74F 10% V
CC
0 5
I
OL
e
20 mA
I
IH
Input HIGH
54F
20 0
m
A
Max
V
IN
e
2 7V
Current
74F
5 0
I
BVI
Input HIGH Current
54F
100
m
A
Max
V
IN
e
7 0V
Breakdown Test
74F
7 0
I
CEX
Output HIGH
54F
250
m
A
Max
V
OUT
e
V
CC
Leakage Current
74F
50
V
ID
Input Leakage
74F
4 75
V
0 0
I
ID
e
1 9 mA
Test
All Other Pins Grounded
I
OD
Output Leakage
74F
3 75
m
A
0 0
V
IOD
e
150 mV
Circuit Current
All Other Pins Grounded
I
IL
Input LOW Current
b
0 6
mA
Max
V
IN
e
0 5V
I
OS
Output Short-Circuit Current
b
60
b
150
mA
Max
V
OUT
e
0V
I
CCH
Power Supply Current
21
32
mA
Max
V
O
e
HIGH
3
AC Electrical Characteristics
74F
54F
74F
T
A
e a
25 C
T
A
V
CC
e
Mil
T
A
V
CC
e
Com
Symbol
Parameter
V
CC
e a
5 0V
C
L
e
50 pF
C
L
e
50 pF
Units
C
L
e
50 pF
Min
Typ
Max
Min
Max
Min
Max
t
PLH
Propagation Delay
3 0
7 0
10 0
3 0
14 0
3 0
11 0
ns
t
PHL
A
n
or B
n
to O
AeB
4 5
7 0
10 0
4 0
15 0
4 0
11 0
t
PLH
Propagation Delay
3 0
5 0
6 5
3 0
8 5
3 0
7 5
ns
t
PHL
I
AeB
to O
AeB
3 5
6 5
9 0
3 5
13 5
3 5
10 0
Applications
Ripple Expansion
TL F 9545 6
Parallel Expansion
TL F 9545 7
Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows
74F
521
S
C
X
Temperature Range Family
Special Variations
74F
e
Commercial
QB
e
Military grade device with
54F
e
Military
environmental and burn-in
processing
Device Type
X
e
Devices shipped in 13 reel
Package Code
Temperature Range
P
e
Plastic DIP
C
e
Commercial (0 C to
a
70 C)
D
e
Ceramic DIP
M
e
Military (
b
55 C to
a
125 C)
F
e
Flatpak
NOTE
S
e
Small Outline SOIC JEDEC
Not required for MSA package code
SJ
e
Small Outline SOIC EIAJ
MSA
e
Shrink Small Outline (EIAJ SSOP)
4
Physical Dimensions
inches (millimeters)
20-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
20-Lead (0 300 Wide) Molded Small Outline Package JEDEC (S)
NS Package Number M20B
5
Physical Dimensions
inches (millimeters) (Continued)
20-Lead (0 300 Wide) Molded Small Outline Package EIAJ (SJ)
NS Package Number M20D
20-Lead (0 300 Wide) Molded Dual-In-Line Package (P)
NS Package Number N20A
6
Physical Dimensions
inches (millimeters) (Continued)
20-Lead (0 300 Wide) Molded Shrink Outline Package EIAJ Type II (MSA)
NS Package Number MSA20
7
54F74F521
8-Bit
Identity
Comparator
Physical Dimensions
inches (millimeters) (Continued)
20-Lead Ceramic Flatpak (F)
NS Package Number W20A
LIFE SUPPORT POLICY
NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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