1

Data sheet acquired from Harris Semiconductor

SCHS250

Features

• Buffered Inputs

• Typical Propagation Delay

• Exceeds 2kV ESD Protection MIL-STD-883, Method

3015

• SCR-Latchup-Resistant CMOS Process and Circuit

Design

• Speed of Bipolar FAST™/AS/S with Significantly

Reduced Power Consumption

• Balanced Propagation Delays

• AC Types Feature 1.5V to 5.5V Operation and

Balanced Noise Immunity at 30% of the Supply

•

±24mA Output Drive Current

- Fanout to 15 FAST™ ICs

- Drives 50

Ω Transmission Lines

Pinout

CD74AC280, CD74ACT280

(PDIP, SOIC)

TOP VIEW

Description

The CD74AC280 and CD74ACT280 9-bit odd/even parity

generator/checkers that utilize the Harris Advanced CMOS

Logic technology. Bothe even and odd parity outputs are

available for checking or generating parity for words up to

nine bits long. Even parity is indicated (

∑Eoutput is HIGH)

when an even number of data inputs is HIGH. Odd parity is

indicated (

∑O output is HIGH) when an odd number of data

inputs is HIGH. Parity checking for words larger than nine

bits can be accomplished by tying the

∑E output to any input

of an additional AC/ACT280 parity checker.

Functional Diagram

I6

I7

NC

I8

∑E

∑O

GND

I5

I4

I3

I2

I1

I0

1

2

3

4

5

6

7

14

13

12

11

10

9

8

Ordering Information

PART

NUMBER

TEMP.

PACKAGE

PKG.

NO.

CD74AC280E

-55 to 125

14 Ld PDIP

E14.3

CD74ACT280E

-55 to 125

14 Ld PDIP

E14.3

CD74AC280M

-55 to 125

14 Ld SOIC

M14.15

CD74ACT280M

-55 to 125

14 Ld SOIC

M14.15

NOTES:

1. When ordering, use the entire part number. Add the suffix 96 to

obtain the variant in the tape and reel.

2. Wafer and die for this part number is available which meets all elec-

trical specifications. Please contact your local sales office or Harris

customer service for ordering information.

8

9

10

11

13

2

1

12

5

6

I0

I1

I2

I3

I5

I6

I7

I4

4

I8

GND = 7

NC = 3

August 1998

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

FAST™ is a Trademark of Fairchild Semiconductor.

Copyright

CD74AC280,

CD74ACT280

9-Bit Odd/Even Parity Generator/Checker

File Number

1957.1