• CP82C55AZ PDIP-40


I/O with 5V and 8MHz


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Overview of CP82C55AZ

The CP82C55AZ is a versatile programmable peripheral interface IC that offers three independent 8-bit bidirectional ports for interfacing with various devices. It provides parallel input/output capability and is commonly used in microcontroller-based systems for flexible I/O operations.


(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • PA0-PA7: Port A 8-bit bidirectional I/O
  • PB0-PB7: Port B 8-bit bidirectional I/O
  • PC0-PC7: Port C 8-bit bidirectional I/O
  • A0-A1: Address inputs for selection
  • CS: Chip Select for device activation
  • RD: Read control signal
  • WR: Write control signal
  • RESET: Reset pin for initialization
  • CLK: Clock input for timing
  • VCC: Positive power supply
  • GND: Ground connection

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the CP82C55AZ IC for a visual representation.

Key Features

  • Three 8-Bit Ports: Provides three independent 8-bit bidirectional ports for versatile I/O operations.
  • Programmable Operation: The CP82C55AZ allows programming of various modes such as mode 0 (basic I/O), mode 1 ( strobed I/O), and mode 2 (bidirectional bus I/O).
  • High-Speed Operation: Supports high-speed data transfer rates for efficient communication in digital systems.
  • Interrupt Capability: Offers interrupt control for handling priority tasks in real-time applications.
  • Wide Operating Voltage Range: Operates within a wide supply voltage range, making it compatible with different system configurations.

Note: For detailed technical specifications, please refer to the CP82C55AZ datasheet.


  • Embedded Systems: Ideal for interfacing with peripheral devices in embedded systems for data transfer.
  • Data Acquisition Systems: Suitable for use in data acquisition systems for parallel data processing and control.
  • Industrial Automation: Used in industrial automation applications for controlling and monitoring external devices.


The CP82C55AZ provides flexible I/O capabilities with three 8-bit ports, allowing for parallel data exchange between microcontrollers and external devices. It enhances the functionality of digital systems by enabling efficient communication.

Usage Guide

  • Configuration: Set the operating mode and port directions based on the desired application requirements.
  • Addressing: Use the address inputs (A0-A1) to select the specific port for data transfer.
  • Data Transfer: Write data to output ports and read data from input ports for bi-directional communication.

Frequently Asked Questions

Q: Can the CP82C55AZ operate in interrupt-driven applications?
A: Yes, the CP82C55AZ supports interrupt capability, making it suitable for interrupt-driven systems that require prioritized task handling.

Q: What is the maximum data transfer rate supported by the CP82C55AZ?
A: The CP82C55AZ can accommodate high-speed data transfer operations, supporting efficient communication in digital systems.


For similar functionalities, consider these alternatives to the CP82C55AZ:

  • Zilog Z8536: A programmable peripheral interface IC offering multiple I/O ports and programmable features.
  • Intel 8255A: This IC provides parallel I/O capabilities with three 8-bit ports, suitable for interfacing with microcontrollers.



The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Pkg. Type PDIP Carrier Type Tube
MOQ 990

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