54AC520
•
54ACT520 8-Bit Identity Comparator
September 1998
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
expansion input I
A = B
also serves as an active LOW enable
input.
n
n
n
n
n
Expandable to any word length
20-pin package
Outputs source/sink 24 mA
’ACT520 has TTL-compatible inputs
Standard Microcircuit Drawing (SMD)
54AC520: 5962-90916
54ACT520: 5962-89793
Features
n
Compares two 8-bit words in 6.5 ns typ
Logic Symbols
IEEE/IEC
DS100234-1
DS100234-4
Pin Names
A
0
–A
7
B
0
–B
7
T
A
O
A
= B
= B
Description
Word A Inputs
Word B Inputs
Expansion or Enable Input
Identity Output
FACT
™
is a trademark of Fairchild Semiconductor Corporation.
© 2001 National Semiconductor Corporation
DS100234
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54AC520
•
54ACT520
Connection Diagrams
Pin Assignment
for DIP and Flatpak
Pin Assignment
for LCC
DS100234-3
DS100234-2
Inputs
I
A
= B
Outputs
O
A
= B
A, B
A = B
*
A
≠
B
A = B
*
A
≠
B
L
L
H
H
L
H
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
*
A
0
= B
0
, A
1
= B
1
, A
2
= B
2
, etc.
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2
54AC520
•
54ACT520
Logic Diagram
DS100234-5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
3
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54AC520
•
54ACT520
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −0.5V
V
I
= V
CC
+ 0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −0.5V
V
O
= V
CC
+ 0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
CDIP
−0.5V to +7.0V
−20 mA
+20 mA
−0.5V to V
CC
+ 0.5V
−20 mA
+20 mA
−0.5V to V
CC
+ 0.5V
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC
’ACT
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
54AC/ACT
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@
3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (∆V/∆t)
’ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@
4.5V, 5.5V
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
−55˚C to +125˚C
125 mV/ns
±
50 mA
±
50 mA
−65˚C to +150˚C
175˚C
125 mV/ns
Note 1:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recom-
mend operation of FACT
™
circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
54AC
Symbol
Parameter
V
CC
(V)
V
IH
Minimum High Level
Input Voltage
V
IL
Maximum Low Level
Input Voltage
V
OH
Minimum High Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
T
A
=
−55˚C to +125˚C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
(Note 2)
V
IN
= V
IL
or V
IH
3.0
4.5
5.5
V
OL
Maximum Low Level
Output Voltage
3.0
4.5
5.5
2.4
3.7
4.7
0.1
0.1
0.1
(Note 2)
V
IN
= V
IL
or V
IH
3.0
4.5
5.5
I
IN
I
IH
Maximum Input
Leakage Current
Maximum Input
High Leakage Current
5.5
20.0
µA
5.5
0.50
0.50
0.50
V
µA
I
OL
= 12 mA
I
OL
= 24 mA
I
OL
= 24 mA
V
I
= V
CC
, GND
A Inputs Only
V
I
= V
CC
B Inputs Only
V
V
I
OH
= −12 mA
I
OH
= −24 mA
I
OH
= −24 mA
I
OUT
= 50 µA
V
I
OUT
= −50 µA
V
V
OUT
= 0.1V
or V
CC
− 0.1V
V
V
OUT
= 0.1V
or V
CC
− 0.1V
Units
Conditions
±
1.0
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4
54AC520
•
54ACT520
DC Characteristics for ’AC Family Devices
54AC
Symbol
Parameter
V
CC
(V)
I
IL
I
OLD
I
OHD
I
CC
I
CC
Maximum Input
Low Leakage Current
Minimum Dynamic
(Note 3)
Output Current
Maximum Quiescent
Supply Current
Maximum Quiescent
Supply Current
Note 2:
All outputs loaded; thresholds on input associated with output under test.
Note 3:
Maximum test duration 2.0 ms, one output loaded at a time.
(Continued)
T
A
=
−55˚C to +125˚C
Guaranteed Limits
−1.5
50
−50
80.0
8.0
Units
Conditions
5.5
5.5
5.5
5.5
5.5
mA
mA
mA
µA
mA
V
I
= V
CC
B Inputs Only
V
OLD
= 1.65V Max
V
OHD
= 3.85V Min
V
IN
= V
CC
V
IN
= GND
DC Characteristics for ’ACT Family Devices
54ACT
Symbol
Parameter
V
CC
(V)
V
IH
V
IL
V
OH
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
4.5
5.5
4.5
5.5
4.5
5.5
T
A
=
−55˚C to +125˚C
Guaranteed Limits
2.0
2.0
0.8
0.8
4.4
5.4
(Note 4)
V
IN
= V
IL
or V
IH
4.5
5.5
V
OL
Maximum Low Level
Output Voltage
4.5
5.5
3.70
4.70
0.1
0.1
(Note 4)
V
IN
= V
IL
or V
IH
4.5
5.5
I
IN
I
IH
I
IL
I
CCT
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current
Maximum Input
High Leakage Current
Maximum Input
Low Leakage Current
Maximum
I
CC
/Input
Minimum Dynamic
(Note 5)
Output Current
Maximum Quiescent
Supply Current
5.5
5.5
5.5
50
−50
80.0
mA
mA
µA
V
OLD
= 1.65V Max
V
OHD
= 3.85V Min
V
IN
= V
CC
or GND
5.5
1.6
mA
5.5
−1.0
mA
5.5
10.0
µA
V
I
= V
CC
B Inputs Only
V
I
= V
CC
B Inputs Only
V
I
= V
CC
− 2.1V
5.5
0.50
0.50
V
µA
I
OL
= 24 mA
I
OL
= 24 mA
V
I
= V
CC
, GND
V
V
I
OH
= −24 mA
I
OH
= −24 mA
I
OUT
= 50 µA
V
V
V
V
OUT
= 0.1V
or V
CC
− 0.1V
V
OUT
= 0.1V
or V
CC
− 0.1V
I
OUT
= −50 µA
Units
Conditions
±
1.0
5
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