1

Data sheet acquired from Harris Semiconductor

SCHS250A

Features

• Buffered Inputs

• Typical Propagation Delay

• Exceeds 2kV ESD Protection per 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

Description

The ’AC280 and ’ACT280 are 9-bit odd/even parity genera-

tor/checkers that utilize Advanced CMOS Logic technology.

Both even and odd parity outputs are available for checking

or generating parity for words up to nine bits long. Even par-

ity is indicated (

∑E output 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 accom-

plished by tying the

∑E output to any input of an additional

’AC280, ’ACT280 parity checker.

Pinout

CD54AC280, CD54ACT280

(CERDIP)

CD74AC280, CD74ACT280

(PDIP, SOIC)

TOP VIEW

Functional Diagram

Ordering Information

PART

NUMBER

TEMP.

PACKAGE

CD54AC280F3A

-55 to 125

14 Ld CERDIP

CD74AC280E

-55 to 125

14 Ld PDIP

CD74AC280M

-55 to 125

14 Ld SOIC

CD54ACT280F3A

-55 to 125

14 Ld CERDIP

CD74ACT280E

-55 to 125

14 Ld PDIP

CD74ACT280M

-55 to 125

14 Ld SOIC

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 TI sales office or cus-

tomer service for ordering information.

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

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 - Revised May 2000

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

FAST™ is a Trademark of Fairchild Semiconductor.

Copyright

CD54/74AC280,

CD54/74ACT280

9-Bit Odd/Even Parity Generator/Checker