NSC 5962R9098501S2A, 5962R9098501BSA, 5962R9098501BRA, 5962R9098501B2A, 5962R9098501SSA Datasheet
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54AC521•54ACT521
8-Bit Identity Comparator
General Description
The AC/ACT521 is an expandable 8-bit comparator. It compares two wordsofup 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.
Features
n ICCreduced by 50
%
n Compares two 8-bit words in 6.5 ns typ
n Expandable to any word length
n Outputs source/sink 24 mA
n ACT521 has TTL-compatible inputs
n Standard microcircuit Drawing (SMD)
54AC521: 5962-90985
54ACT521: 5962-89793
Logic Symbols Connection Diagram
Pin Descriptions
Pin Names Description
A
0–A7
Word A Inputs
B
0–B7
Word B Inputs
T
A=B
Expansion or Enable Input
O
A=B
Identity Output
FACT™is a trademark of Fairchild Semiconductor Corporation.
DS100291-1
IEEE/IEC
DS100291-4
Pin Assignment
for DIP and CERPACK
DS100291-2
Pin Assignment
for LCC
DS100291-3
September 1998
54AC521
•
54ACT521 8-Bit Identity Comparator
© 1998 National Semiconductor Corporation DS100291 www.national.com
Truth Table
Inputs Outputs
I
A=B
A, B O
A=B
LA
=
B (Note 1) L
LA
≠
BH
HA
=
B (Note 1) H
HA
≠
BH
H
=
HIGH Voltage Level
L=LOW Voltage Level
Note 1: A
0
=
B
0,A1
=
B
1,A2
=
B
2
, etc.
Logic Diagram
DS100291-5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
=
−0.5V −20 mA
V
I
=
V
CC
+ 0.5V +20 mA
DC Input Voltage (V
I
) −0.5V to VCC+ 0.5V
DC Output Diode Current (I
OK
)
V
O
=
−0.5V −20 mA
V
O
=
V
CC
+ 0.5V +20 mA
DC Output Voltage (V
O
) −0.5V to VCC+ 0.5V
DC Output Source
or Sink Current (I
O
)
±
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
±
50 mA
Storage Temperature (T
STG
) −65˚C to +150˚C
Junction Temperature (T
J
)
CDIP 175˚C
Recommended Operating
Conditions
Supply Voltage (VCC)
AC 2.0V to 6.0V
ACT 4.5V to 5.5V
Input Voltage (V
I
) 0VtoV
CC
Output Voltage (VO) 0VtoV
CC
Operating Temperature (TA)
54AC/ACT −55˚C to +125˚C
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 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)
ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@
4.5V, 5.5V 125 mV/ns
Note 2: 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, output/input loading variables. Fairchild does not recommend
operation of FACT
™
circuits outside databook specifications.
DC Electrical Characteristics for AC
Symbol Parameter V
CC
T
A
=
−55˚C to +125˚C Units Conditions
(V) Guaranteed Limits
V
IH
Minimum High Level 3.0 2.1 V
OUT
=
0.1V
Input Voltage 4.5 3.15 V or V
CC
− 0.1V
5.5 3.85
V
IL
Maximum Low Level 3.0 0.9 V
OUT
=
0.1V
Input Voltage 4.5 1.35 V or V
CC
− 0.1V
5.5 1.65
V
OH
Minimum High Level 3.0 2.9 I
OUT
=
−50 µA
Output Voltage 4.5 4.4 V
5.5 5.4
V
IN
=
V
IL
or V
IH
3.0 2.4 IOH=−4mA
4.5 3.7 V I
OH
= −24 mA
5.5 4.7 I
OH
= −24 mA (Note 3)
V
OL
Maximum Low Level 3.0 0.1 I
OUT
=
50 µA
Output Voltage 4.5 0.1 V
5.5 0.1
V
IN
=
V
IL
or V
IH
3.0 0.4 IOL=12mA
4.5 0.5 V I
OL
=24mA
5.5 0.5 I
OL
= 24 mA (Note 3)
I
IN
Maximum Input 5.5
±
1.0 µA V
I
=
V
CC
, GND
(Note 5) Leakage Current
I
OLD
Minimum Dynamic
Output Current (Note 4)
5.5 50 mA V
OLD
=
1.65V Max
I
OHD
5.5 −50 mA V
OHD
=
3.85V Min
I
CC
Maximum Quiescent 5.5 80.0 µA V
IN
=
V
CC
(Note 5) Supply Current or GND
Note 3: All outputs loaded; thresholds on input associated with output under test.
Note 4: Maximum test duration 2.0 ms, one output loaded at a time.
Note 5: I
IN
and I
CC
@
3.0V are guaranteed to be less than or equal to the respective limit@5.5V VCC.
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