74F280B

The 74F280B is a 9-bit Parity Generator or Checker commonly used to detect errors in high speed data transmission or data retrieval systems. Both Even (_E) and Odd (_O) parity outputs are available for generating or checking even or odd parity on up to 9 bits.

The Even (_E) parity output is High when an even number of Data inputs (I0 - I8) are High. The Odd (_O) parity output is High when an odd number of Data inputs are High.

Expansion to larger word sizes is accomplished by tying the Even (_E) outputs of up to nine parallel devices to the data inputs of the final stage. This expansion scheme allows an 81-bit data word to be checked in less than 20ns.