74AC280 9-Bit Parity Generator/Checker
November 1988
Revised November 1999
74AC280
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 out-
put.
Features
s
I
CC
reduced by 50%
s
9-bit width for memory applications
s
AC280: 5962-92201
Ordering Code:
Order Number
74AC280SC
74AC280SJ
Package Number
M14A
M14D
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow Body
14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Truth Table
Pin Descriptions
Pin Names
I
0
–I
8
∑
Ο
∑
Ε
Description
Data Inputs
Odd Parity Output
Even Parity Output
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
H
L
∑
Odd
L
H
FACT is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation
DS009955
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74AC280
Logic Diagram
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
74AC280
Absolute Maximum Ratings
(Note 1)
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
)
PDIP
140°C
±50
mA
−65°C
to
+150°C
±50
mA
−20
mA
+20
mA
−0.5V
to V
CC
+
0.5V
−20
mA
+20
mA
−0.5V
to V
CC
+
0.5V
−0.5V
to
+7.0V
Recommended Operating
Conditions
Supply Voltage (V
CC
)
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (∆V/∆t)
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.3V, 4.5V, 5.5V
125 mV/ns
2.0V to 6.0V
0V to V
CC
0V to V
CC
−40°C
to
+85°C
Note 1:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception, to ensure that the system design is reliable over its power
supply, temperature, output/input loading variables. Fairchild does not rec-
ommend operation of FACT circuits outside databook specifications.
DC Electrical Characteristics
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
I
IN
I
OLD
I
OHD
I
CC
(Note 4)
Maximum Input
Leakage Current
Minimum Dynamic
Output Current (Note 3)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
4.0
0.002
0.001
0.001
T
A
= +25°C
Typ
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±0.1
T
A
= −40°C
to+85°C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
V
IN
=
V
IL
or V
IH
2.46
3.76
4.76
0.1
0.1
0.1
V
IN
=
V
IL
or V
IH
0.44
0.44
0.44
±1.0
75
−75
40.0
µA
mA
mA
µA
V
I
OL
= 12 mA
I
OL
= 24 mA
I
OL
= 24 mA (Note 2)
V
I
=
V
CC
, GND
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or GND
V
I
OUT
=
50
µA
V
I
OH
=
−12
mA
I
OH
=
−24
mA
I
OH
=
−24
mA (Note 2)
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
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
.
3
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74AC280
AC Electrical Characteristics
V
CC
Symbol
Parameter
(V)
(Note 5)
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay
I
n
to
∑
Ε
Propagation Delay
I
n
to
∑
Ο
Voltage range 5.0 is 5.0V
±
0.5V.
T
A
= +25°C
C
L
=
50 pF
Min
5.0
3.0
5.0
3.0
Typ
10.5
7.5
12.0
8.5
Max
17.0
13.0
17.0
13.0
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
4.0
2.0
4.0
2.0
Max
18.5
14.5
18.5
14.5
ns
ns
Units
3.3
5.0
3.3
5.0
Note 5:
Voltage range 3.3 is 3.3V
±
0.3V.
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
75.0
Units
pF
pF
V
CC
=
OPEN
V
CC
=
5.0V
Conditions
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4
74AC280
Physical Dimensions
inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow Body
Package Number M14A
5
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