Detailed Description

These universal, monolithic, nine-bit parity generators/checkers utilize Schottky-clamped TTL high-performance circuitry and feature odd/even outputs to facilitate operation of either odd or even parity application. The word-length capability is easily expanded by cascading.
Series 74S parity generators/checkers offer the designer a trade-off between reduced power consumption and high performance. These devices can be used to upgrade the performance of most systems utilizing the '180 parity generator/checker. Although the SN74S280J is implemented without expander inputs, the corresponding function is provided by the availability of an input at pin 4 and the absence of any internal connection at pin 3. This permits the SN74S280J to be substituted for the '180 in existing designs to produce an identical function even if SN74S280J's are mixed with existing '180's. These devices are fully compatible with most other TTL circuits. All inputs are buffered to lower the drive requirements to one 74S standard load, respectively.

Features:
Generates Either Odd or Even Parity for Nine Data Lines
Cascadable for n-Bits
Can Be Used to Upgrade Existing Systems using MSI Parity Circuits
Typical Data-to-Output Delay of Only 14 ns
Typical Power Dissipation: 335 mW

14 pin DIP. Manufactured by Texas Instruments.
A11078