54AC280 9-Bit Parity Generator/Checker
September 1998
54AC280
9-Bit Parity Generator/Checker
General Description
The ’AC280 is a high-speed parity generator/checker that
accepts nine bits of input data and detects whether an even
or an odd number of these inputs is HIGH. If an even number
of inputs is HIGH, the Sum Even output is HIGH. If an odd
number is HIGH, the Sum Even output is LOW. The Sum
Odd output is the complement of the Sum Even output.
Features
n
I
CC
reduced by 50%
n
9-bit width for memory applications
n
Standard Microcircuit Drawing (SMD) 5962-92201
Logic Symbols
Connection Diagrams
Pin Assignment for
DIP and Flatpak
DS100359-1
IEEE/IEC
DS100359-2
Pin Assignment for LCC
DS100359-4
Pin
Names
I
0
–I
8
∑
O
∑
E
Description
DS100359-3
Data Inputs
Odd Parity Output
Even Parity Output
Truth Table
Number of
HIGH Inputs
I
0
–I
8
0, 2, 4, 6, 8
1, 3, 5, 7, 9
H = HIGH Voltage Level
L = LOW Voltage Level
Outputs
∑
Even
∑
Odd
H
L
L
H
FACT
™
is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100359
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Logic Diagram
DS100359-5
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 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
)
−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
CDIP
175˚C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
54AC
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
2.0V to 6.0V
0V to V
CC
0V to V
CC
−55˚C to +125˚C
±
50 mA
±
50 mA
−65˚C to +150˚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, output/input loading variables. National does not recommend
operation of FACT circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
Symbol
Parameter
V
CC
(V)
54AC
T
A
=
−55˚C to
+125˚C
Guaranteed Limits
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
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
OLD
I
OHD
Maximum Input
Leakage Current
Minimum Dynamic
Output Current
(Note 3)
5.5
5.5
50
−50
mA
mA
V
OLD
= 1.65V Max
V
OHD
= 3.85V Min
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
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
3
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DC Characteristics for ’AC Family Devices
Symbol
Parameter
V
CC
(V)
(Continued)
54AC
T
A
=
Units
Conditions
−55˚C to
+125˚C
Guaranteed Limits
80.0
µA
V
IN
= V
CC
or GND
I
CC
Maximum Quiescent
Supply Current
5.5
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.
Note 4:
I
IN
and I
CC
@
3.0V are guaranteed to be less than or equal to the respective limit
@
5.5V V
CC
.
AC Electrical Characteristics
V
CC
Symbol
Parameter
(V)
(Note 5)
Min
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay
I
n
to
∑
E
Propagation Delay
I
n
to
∑
O
3.3
5.0
3.3
5.0
1.0
1.0
1.0
1.0
54AC
T
A
= −55˚C
to +125˚C
C
L
= 50 pF
Max
20.0
14.5
20.0
14.5
ns
ns
Units
Note 5:
Voltage range 3.3 is 3.3V
±
0.3V.
Voltage range 5.0 is 5.0V
±
0.5V.
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
75.0
Units
pF
pF
Conditions
V
CC
= OPEN
V
CC
= 5.0V
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Physical Dimensions
inches (millimeters) unless otherwise noted
20 Terminal Ceramic Leadless Chip Carrier
NS Package Number E20A
14 Lead Ceramic Dual-In-Line Package
NS Package Number J14A
5
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