DM74AS280

DM74AS280 9-Bit Parity Generator/Checker

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DM74AS280 9-Bit Parity Generator/Checker

June 2007

DM74AS280 9-Bit Parity Generator/Checker
Features
Generates either odd or even parity for nine data lines Inputs are buffered to lower the drive requirements Can be used to upgrade existing systems using MSI

General Description
These universal, 9-bit parity generators/checkers utilize advanced Schottky high performance circuitry and feature odd/even outputs to facilitate operation of either odd or even parity applications. The word length capability is easily expanded by cascading. The DM74AS280 can be used to upgrade the performance of most systems utilizing the 180 parity generator/ checker. Although the DM74AS280 is implemented without expander inputs, the corresponding function is provided by the availability of an input at pin 4 and no internal connection at pin 3. This permits the DM74AS280 to be substituted for the 180 in existing designs to produce identical function even if DM74AS280s are mixed with existing 180s.

parity circuits Cascadable for N-bits Advanced oxide-isolated, ion-implanted Schottky TTL process Switching specifications at 50pF Switching specifications guaranteed over full temperature and VCC range

Ordering Information
Order Number
DM74AS280M

Package Number
M14A

Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering number.

Connection Diagram

Function Table
Number of Inputs (A thru I) that are HIGH
0, 2, 4, 6, 8 1, 3, 5, 7, 9 L LOW State H HIGH State

Outputs Even
H L

Odd
L H

1986 Fairchild Semiconductor Corporation DM74AS280 Rev. 1.2

www.fairchildsemi.com