5-456

FAST AND LS TTL DATA

9-BIT ODD/EVEN PARITY

GENERATORS/CHECKERS

The SN54/ 74LS280 is a Universal 9-Bit Parity Generator / Checker. It fea-

tures 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.

14

13

12

11

10

9

1

2

3

4

5

6

8

7

VCC

F

E

D

C

B

A

G

H

NC

I

∑

EVEN

GND

F

E

D

C

B

A

G

H

I

INPUTS

INPUT

OUTPUTS

∑

ODD

∑

EVEN

∑

ODD

INPUTS

FUNCTION TABLE

NUMBER OF INPUTS A

THRU 1 THAT ARE HIGH

OUTPUTS

NUMBER OF INPUTS A

THRU 1 THAT ARE HIGH

∑EVEN ∑ODD

0, 2, 4, 6, 8

H

L

1, 3, 5, 7, 9

L

H

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

SN54/74LS280

9-BIT ODD / EVEN PARITY

GENERATORS / CHECKERS

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

J SUFFIX

CERAMIC

CASE 632-08

N SUFFIX

PLASTIC

CASE 646-06

14

1

14

1

14

1

D SUFFIX

SOIC

CASE 751A-02