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74F280 9-Bit Parity Generator/Checker
April 1988
Revised September 2000
74F280
9-Bit Parity Generator/Checker
General Description
The F280 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.
Ordering Code:
Order Number
74F280SC
74F280SJ
74F280PC
Package Number
M14A
M14D
N14A
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
© 2000 Fairchild Semiconductor Corporation
DS009512
www.fairchildsemi.com
74F280
Unit Loading/Fan Out
Pin Names
I
0
–I
8
Description
Data Inputs
Odd Parity Output
Even Parity Output
U.L.
HIGH/LOW
1.0/1.0
50/33.3
50/33.3
Input I
IH
/I
IL
Output I
OH
/I
OL
20
µ
A/
−
0.6 mA
∑
O
∑
E
−
1 mA/20 mA
−
1 mA/20 mA
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
H
L
∑
Odd
L
H
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
74F280
Absolute Maximum Ratings
(Note 1)
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Output
in HIGH State (with V
CC
=
0V)
Standard Output
3-STATE Output
Current Applied to Output
in LOW State (Max)
ESD Last Passing Voltage (Min)
twice the rated I
OL
(mA)
4000V
−
65
°
C to
+
150
°
C
−
55
°
C to
+
125
°
C
−
55
°
C to
+
150
°
C
−
0.5V to
+
7.0V
−
0.5V to
+
7.0V
−
30 mA to
+
5.0 mA
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0
°
C to
+
70
°
C
+
4.5V to
+
5.5V
−
0.5V to V
CC
−
0.5V to
+
5.5V
Note 1:
Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2:
Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
V
OL
I
IH
I
BVI
I
CEX
V
ID
I
OD
I
IL
I
OS
I
CCH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW Voltage
Input HIGH
Current
Input HIGH Current
Breakdown Test
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
Output Short-Circuit Current
Power Supply Current
−60
25
4.75
3.75
−0.6
−150
38
10% V
CC
5% V
CC
10% V
CC
2.5
2.7
0.5
5.0
7.0
50
V
µA
µA
µA
V
µA
mA
mA
mA
Min
Max
Max
Max
0.0
0.0
Max
Max
Max
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
V
Min
Min
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
I
IN
= −18
mA
I
OH
= −1
mA
I
OH
= −1
mA
I
OL
=
20 mA
V
IN
=
2.7V
V
IN
=
7.0V
V
OUT
=
V
CC
I
ID
=
1.9
µA
All Other Pins Grounded
V
IOD
=
150 mV
All Other Pins Grounded
V
IN
=
0.5V
V
OUT
=
0V
V
O
=
HIGH
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
Min
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay
I
n
to
∑
E
Propagation Delay
I
n
to
∑
O
6.5
6.5
6.0
6.5
V
CC
= +5.0V
C
L
=
50 pF
Typ
10.0
11.0
10.0
11.0
Max
15.0
16.0
15.0
16.0
T
A
= −55°C
to
+125°C
V
CC
=
5.0V
C
L
=
50 pF
Min
6.5
6.5
5.0
6.5
Max
20.0
21.0
20.0
21.0
T
A
=
0°C to
+70°C
V
CC
=
5.0V
C
L
=
50 pF
Min
6.5
6.5
6.0
6.5
Max
16.0
17.0
16.0
17.0
ns
ns
Units
3
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74F280
Physical Dimensions
inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Package Number M14A
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