INS8253 Datasheet | National Semiconductor

~National ~ Semiconductor Preliminary JULY 1978 INS8253 Programmable Interval Timer General. Description The INS8253 is a programmable timer/counter device contained in a standard, 24-pin dual-in-line package. The chip, which is fabricated using N-channel silicon gate technology, provides counting or time-out services in a microputer system. The various operating modes and other functional characteristics of thelNS8253 are programmed by the system software. The INS8253 provides three independent 16-bit down counters, each of which is capable of count rates in the range DC to 2MHz. Through software initialization, each counter can be made to operate in anyone of six modes. The modulus...