MC6821P Peripheral Interface Adapter 5V IC DIP-40

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MC6821P Peripheral Interface Adapter 5V IC DIP-40 The MC6821P Peripheral Interface Adapter (PIA) is a programmable parallel I/O integrated circuit designed to provide an efficient interface between microprocessors and peripheral devices. It features two independent 8-bit bidirectional data ports, allowing a processor to communicate with switches, keyboards, displays, printers, relays, and other digital hardware. The device was widely used with Motorola 6800-series microprocessors and became a popular component in early computer systems, industrial controllers, and embedded designs. The MC6821P includes programmable control registers, interrupt capabilities, and flexible handshaking functions, enabling reliable communication with external equipment. Its ability to handle both input and output operations while generating interrupts makes it suitable for real-time control systems and legacy computing applications. Today, it remains valuable for retro-computing projects, educational purposes, and the maintenance of vintage electronic systems. Features: 8-Bit Bidirectional Data Bus for Communication with the MPU Two Bidirectional 8-Bit Buses for Interface to Peripherals Two Programmable Control Registers Two Programmable Data Direction Registers Four Individually-Controlled Interrupt Input Lines; Two Usable as Peripheral Control Outputs Handshake Control Logic for Input and Output Peripheral Operation High-impedance Three-State and Direct Transistor Drive Peripheral Lines Program Controlled interrupt and Interrupt Disable Capability CMOS Drive Capability on Side A Peripheral Lines Two TTL Drive Capability on All A and 8 Side Buffers TTL-Compatible Static Operation Specifications: Parameter Value Part Number MC6821P Device Type Peripheral Interface Adapter (PIA) Number of I/O Ports 2 Port Width 8 Bits Each Total I/O Lines 16 Control Lines 4 Package Type DIP-40 Mounting Type Through-Hole Logic Family TTL Compatible Interface Type Parallel Operating Voltage 5V Pinout: Applications: Microprocessor systems. Industrial control equipment. Retro computer restoration. Embedded control systems. Keyboard interfaces. Printer interfaces. Data acquisition systems. Digital I/O expansion. Educational microprocessor projects. Instrumentation and measurement equipment. Legacy hardware maintenance. Custom controller designs. Package Includes: 1x MC6821P Peripheral Interface Adapter 5V IC DIP-40. Documents: MC6821 Datasheet