SN54/74LS280
9-BIT ODD/EVEN PARITY
GENERATORS/CHECKERS
The SN54 / 74LS280 is a Universal 9-Bit Parity Generator / Checker. It features odd / even outputs to facilitate either odd or even parity. By cascading,
the word length is easily expanded.
The LS280 is designed without the expander input implementation, but the
corresponding function is provided by an input at Pin 4 and the absence of any
connection at Pin 3. This design permits the LS280 to be substituted for the
LS180 which results in improved performance. The LS280 has buffered
inputs to lower the drive requirements to one LS unit load.
•
•
•
•
•
9-BIT ODD / EVEN PARITY
GENERATORS/ CHECKERS
LOW POWER SCHOTTKY
Generates Either Odd or Even Parity for Nine Data Lines
Typical Data-to-Output Delay of only 33 ns
Cascadable for n-Bits
Can Be Used To Upgrade Systems Using MSI Parity Circuits
Typical Power Dissipation = 80 mW
J SUFFIX
CERAMIC
CASE 632-08
14
1
INPUTS
VCC
14
F
E
D
C
B
A
13
12
11
10
9
8
F
E
D
C
B
N SUFFIX
PLASTIC
CASE 646-06
14
1
G
A
H
1
G
2
H
I
3
NC
∑
∑
EVEN ODD
14
4
5
6
7
∑
∑ GND
I
INPUT EVEN ODD
1
D SUFFIX
SOIC
CASE 751A-02
INPUTS
OUTPUTS
ORDERING INFORMATION
FUNCTION TABLE
NUMBER OF INPUTS A
THRU 1 THAT ARE HIGH
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
OUTPUTS
∑EVEN
∑ODD
H
L
Ceramic
Plastic
SOIC
L
H
0, 2, 4, 6, 8
1, 3, 5, 7, 9
H = HIGH Level, L = LOW Level
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
– 55
0
25
25
125
70
°C
IOH
Output Current — High
54, 74
– 0.4
mA
IOL
Output Current — Low
54
74
4.0
8.0
mA
FAST AND LS TTL DATA
5-1
