NSC 54ACT521

54AC521 • 54ACT521
8-Bit Identity Comparator
General Description
Features
The AC/ACT521 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 IA = B also serves as an active LOW enable input.
n
n
n
n
n
n
Logic Symbols
Connection Diagram
ICC reduced by 50%
Compares two 8-bit words in 6.5 ns typ
Expandable to any word length
Outputs source/sink 24 mA
ACT521 has TTL-compatible inputs
Standard microcircuit Drawing (SMD)
54AC521: 5962-90985
54ACT521: 5962-89793
Pin Assignment
for DIP and CERPACK
DS100291-1
IEEE/IEC
DS100291-2
Pin Assignment
for LCC
DS100291-4
DS100291-3
Pin Descriptions
Pin Names
Description
A0–A7
Word A Inputs
B0–B7
Word B Inputs
TA = B
Expansion or Enable Input
OA = B
Identity Output
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100291
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54AC521 • 54ACT521 8-Bit Identity Comparator
September 1998
Truth Table
Inputs
IA = B
L
L
H
H
Outputs
A, B
A = B (Note 1)
A≠B
A = B (Note 1)
A≠B
OA = B
L
H
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
Note 1: A0 = B0, A1 = B1, A2 = B2, 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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2
Absolute Maximum Ratings (Note 2)
Recommended Operating
Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
DC Input Diode Current (IIK)
VI = −0.5V
VI = VCC + 0.5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
VO = −0.5V
VO = VCC + 0.5V
DC Output Voltage (VO)
DC Output Source
or Sink Current (IO)
DC VCC or Ground Current
per Output Pin (ICC or IGND)
Storage Temperature (TSTG)
Junction Temperature (TJ)
CDIP
Supply Voltage (VCC)
AC
ACT
Input Voltage (VI)
Output Voltage (VO)
Operating Temperature (TA)
54AC/ACT
Minimum Input Edge Rate (∆V/∆t)
AC Devices
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (∆V/∆t)
ACT Devices
VIN from 0.8V to 2.0V
VCC @ 4.5V, 5.5V
−0.5V to +7.0V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
± 50 mA
± 50 mA
−65˚C to +150˚C
2.0V to 6.0V
4.5V to 5.5V
0V to VCC
0V to VCC
−55˚C to +125˚C
125 mV/ns
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.
175˚C
DC Electrical Characteristics for AC
Symbol
VIH
VIL
VOH
Parameter
VCC
TA = −55˚C to +125˚C
(V)
Guaranteed Limits
Minimum High Level
3.0
2.1
Input Voltage
4.5
3.15
5.5
3.85
Maximum Low Level
3.0
0.9
Input Voltage
4.5
1.35
5.5
1.65
Units
Conditions
VOUT = 0.1V
V
or VCC − 0.1V
V
or VCC − 0.1V
VOUT = 0.1V
IOUT = −50 µA
Minimum High Level
3.0
2.9
Output Voltage
4.5
4.4
5.5
5.4
3.0
2.4
4.5
3.7
5.5
4.7
Maximum Low Level
3.0
0.1
Output Voltage
4.5
0.1
5.5
0.1
3.0
0.4
4.5
0.5
5.5
0.5
5.5
± 1.0
µA
VI = V
VOLD = 1.65V Max
V
VIN = V
VOL
V
Maximum Input
(Note 5)
Leakage Current
IOLD
Minimum Dynamic
Output Current (Note 4)
IOHD
ICC
Maximum Quiescent
(Note 5)
Supply Current
or VIH
IOH = −24 mA
IOH = −24 mA (Note 3)
IOUT = 50 µA
V
VIN = V
IIN
IL
IOH = −4 mA
IL
or VIH
IOL = 12 mA
V
IOL = 24 mA
IOL = 24 mA (Note 3)
CC,
GND
5.5
50
mA
5.5
−50
mA
VOHD = 3.85V Min
5.5
80.0
µA
VIN = V
CC
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: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.
3
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DC Electical Characteristics for ACT
Symbol
VIH
VIL
VOH
Parameter
VCC
TA = −55˚C to +125˚C
(V)
Guaranteed Limits
Minimum High Level
4.5
2.0
Input Voltage
5.5
2.0
Maximum Low Level
4.5
0.8
Input Voltage
5.5
0.8
Minimum High Level
4.5
4.4
Output Voltage
5.5
5.4
4.5
3.7
Units
Conditions
VOUT = 0.1V
V
or VCC − 0.1V
VOUT = 0.1V
V
or VCC − 0.1V
IOUT = −50 µA
V
VIN = V
VOL
5.5
4.7
Maximum Low Level
4.5
0.1
Output Voltage
5.5
0.1
4.5
0.5
V
Maximum Input
or VIH
IOH = −24 mA (Note 6)
IOUT = 50 µA
V
VIN = V
IIN
IL
IOH = −24 mA
V
IL
or VIH
IOL = 24 mA
IOL = 24 mA (Note 6)
5.5
0.5
5.5
± 1.0
µA
VI = V
CC,
GND
5.5
1.5
mA
VI = V
CC
− 2.1V
Leakage Current
ICCT
Maximum
ICC/Input
IOLD
IOHD
ICC
Minimum Dynamic
Output Current (Note 7)
Maximum Quiescent
5.5
50
mA
VOLD = 1.65V Max
5.5
−50
mA
VOHD = 3.85V Min
5.5
80.0
µA
VIN = V
Supply Current
CC
or GND
Note 6: All outputs loaded; thresholds on input associated with output under test.
Note 7: Maximum test duration 2.0 ms, one output loaded at a time.
AC Electrical Characteristics for AC
Symbol
tPLH
tPHL
tPLH
Parameter
TA = −55˚C to +125˚C
(V)
CL = 50 pF
(Note 8)
Min
3.3
1.0
15.0
An or Bn to OA
5.0
1.0
11.0
= B
Max
Propagation Delay
3.3
1.0
10.5
An or Bn to OA
5.0
1.0
8.0
= B
Propagation Delay
= B
to OA
= B
Propagation Delay
IA
= B
to OA
= B
3.3
1.0
15.0
5.0
1.0
11.0
3.3
1.0
10.5
5.0
1.0
8.0
Note 8: Voltage Range 3.3 is 3.3V ± 0.3V
Voltage Range 5.0 is 5.0V ± 0.5V
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Units
Propagation Delay
IA
tPHL
VCC
4
ns
ns
ns
ns
AC Electrical Characteristics for ACT
Symbol
tPLH
Parameter
Propagation Delay
An or Bn to OA
tPHL
tPLH
tPHL
= B
to OA
= B
to OA
Units
(Note 9)
Min
Max
5.0
1.5
11.0
ns
5.0
1.5
12.0
ns
5.0
1.5
7.5
ns
5.0
1.5
8.5
ns
= B
Propagation Delay
IA
CL = 50 pF
= B
Propagation Delay
IA
TA = −55˚C to +125˚C
(V)
= B
Propagation Delay
An or Bn to OA
VCC
= B
Note 9: Voltage Range 5.0 is 5.0V ± 0.5V
Capacitance
Typ
Units
CIN
Symbol
Input Capacitance
Parameter
4.5
pF
VCC = OPEN
CPD
Power Dissipation Capacitance
40
pF
VCC = 5.0V
5
Conditions
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Applications
Ripple Expansion
DS100291-6
Parallel Expansion
DS100291-7
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6
7
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Ceramic Leadless Chip Carrier
Package Number E20A
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8
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20-Lead Ceramic Dual-in-line
J20A
20-Lead Cerpack
Package Number W20A
9
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54AC521 • 54ACT521 8-Bit Identity Comparator
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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:
2. A critical component in any component of a life support
1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into
sonably expected to cause the failure of the life support
the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness.
ure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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