INS8259 Datasheet | National Semiconductor

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 microputer 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. 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 Package - MICROBUSTM- patible INS8080 Family C~U Group to MICROBUS Configuration .r READY DP8224 CLOCK GENERATOR & DRIVER ¢1 RESET READY INS8080A MICRDPROCESSOR ~ INTR CONTROL SIGNALS lii'iii, DSIN) HLDA ~ INTA STSTS l CPU DATA BUS(8) DP8228/DP8238 SYSTEM CONTROLLER t Ql.m!I+----+I I!'ISBl$!- '--------4lrmi'. csl~--...;;;;.--I "1">-.$ti- . . .- ' - - - - - - - - t 1 1 i ' I A 1I01-.--:,;;..--t !W;.;;If-o II----=---t .'.,'.'. ";, - A trademark of National Semiconductor...