UM82C55A interface equivalent, cmos progrmmable peripheral interface.
* Pin compatible with NMOS 8255A
* 24 programmable I/O pins
* Fully TTL compatible
* Bus-hold circuitry on all I/O ports eliminates pull-up
resistors
.
The UM82C55A is a high performance CMOS version of the industry standard 8255A and is manufactured using a selfaligned silicon gate CMOS process. It is a general purpose programmable I/O device which may be used with many different microprocessors. T.
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