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BUY IS82C59AZ https://www.utsource.net/itm/p/1729015.html
CMOS Priority Interrupt Controller
Description: Programmable Interval Timer Features: 8-bit programmable counter/timer 8-bit programmable prescaler Programmable one-shot/interval mode Programmable output polarity Programmable interrupt enable Programmable counter/timer latch Programmable counter/timer reset Programmable counter/timer clock Programmable counter/timer gate Programmable counter/timer output Programmable counter/timer mode Programmable counter/timer enable Programmable counter/timer interrupt Application: The IS82C59AZ Programmable Interval Timer is designed for use in a wide range of applications including industrial control, instrumentation, and communications systems. It is particularly well suited for use in microprocessor-based systems where it can be used to generate periodic interrupts or control the timing of various operations. (For reference only)