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INS8259 - Programmable Interrupt Controller

General Description

The INS8259 is a Programmable Interrupt Controller chip contained in a standard 28-pin dual-in-Iine package_ The chip, which is fabricated using N-channel silicon gate technology, functions as a versatile interrupt management device in a microcomputer system.

Key Features

  • Performs Priority Control of up to Eight Interrupt Levels.
  • Can be Expanded to Handle up to 64 Levels Through Cascading.
  • Four Programmable Operating Modes.
  • Programmable Interrupt Vectors, Allowing Service Routines to be Located Anywhere in Memory.
  • Interrupt Request Inputs Can be Individually Masked.
  • TRI-STATE@ TTL Drive Capability for Bidirectional Data and Control Buses.
  • Single + 5 Volt Power Supply.
  • 28-Pin Dual-in-Line Pac.

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INS8250 Asynchronous Receiver/Transmitter
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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~National ~ Semiconductor Preliminary JULY 1978 INS8259 Programmable Interrupt Controller General Description The INS8259 is a Programmable Interrupt Controller chip contained in a standard 28-pin dual-in-Iine package_ The chip, which is fabricated using N-channel silicon gate technology, functions as a versatile interrupt management device in a microcomputer system. Each INS8259 resolves interrupt requests from up to eight different sources. These devices can be cascaded to provide interrupt management of up to 64 levels with no other circuitry required. The INS8259 minimizes software and real time overhead when handling multi-level priority interrupts. Its four operating modes allow the device to satisfy diverse system requirements.