These universal 9-bit parity generators/checkers utilize advanced
circuitry and feature odd ( ODD)
and even ( EVEN) outputs
to facilitate operation of either odd- or even-parity applications.
The word-length capability is easily expanded by cascading.
These devices can be used to upgrade the performance of most
systems utilizing the SN74ALS180 and SN74AS180 parity
generators/checkers. Although the SN74ALS280 and SN74AS280 are
implemented without expander inputs, the corresponding function is
provided by the availability of an input (I) at terminal 4 and the
absence of any internal connection at terminal 3. This permits the
SN74ALS280 and SN74AS280 to be substituted for the SN74ALS180 and
SN74AS180 in existing designs to produce an identical function even
if the devices are mixed with existing SN74ALS180 and SN74AS180
All SN74AS280 inputs are buffered to lower the drive requirements.
The SN74ALS280 and SN74AS280 are characterized for operation from
0°C to 70°C.
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