IQ82C55AZ

Product Overview

Category

The IQ82C55AZ belongs to the category of integrated circuits (ICs) specifically designed for use in microprocessor-based systems.

Use

This IC is commonly used as an input/output (I/O) controller in various electronic devices and systems. It facilitates communication between the microprocessor and peripheral devices, enabling data transfer and control signals.

Characteristics

• The IQ82C55AZ offers versatile I/O capabilities, making it suitable for a wide range of applications.
• It supports three distinct modes of operation: mode 0 (basic I/O), mode 1 (strobe I/O), and mode 2 (bidirectional bus).
• This IC features programmable parallel I/O ports, allowing customization based on specific system requirements.
• It incorporates built-in interrupt handling capabilities, enhancing system responsiveness.
• The IQ82C55AZ operates at low power consumption levels, making it energy-efficient.

Package and Quantity

The IQ82C55AZ is typically available in a 40-pin dual in-line package (DIP). Each package contains one IC.

Specifications

• Supply Voltage: 5V ±10%
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 8 MHz
• Number of I/O Ports: 24
• Interrupt Inputs: 4
• Data Bus Width: 8 bits

Detailed Pin Configuration

The IQ82C55AZ features a total of 40 pins, each serving a specific function. The pin configuration is as follows:

1. PA0 (Port A, Bit 0)
2. PA1 (Port A, Bit 1)
3. PA2 (Port A, Bit 2)
4. PA3 (Port A, Bit 3)
5. PA4 (Port A, Bit 4)
6. PA5 (Port A, Bit 5)
7. PA6 (Port A, Bit 6)
8. PA7 (Port A, Bit 7)
9. GND (Ground)
10. PB0 (Port B, Bit 0)
11. PB1 (Port B, Bit 1)
12. PB2 (Port B, Bit 2)
13. PB3 (Port B, Bit 3)
14. PB4 (Port B, Bit 4)
15. PB5 (Port B, Bit 5)
16. PB6 (Port B, Bit 6)
17. PB7 (Port B, Bit 7)
18. PC0 (Port C, Bit 0)
19. PC1 (Port C, Bit 1)
20. PC2 (Port C, Bit 2)
21. PC3 (Port C, Bit 3)
22. PC4 (Port C, Bit 4)
23. PC5 (Port C, Bit 5)
24. PC6 (Port C, Bit 6)
25. PC7 (Port C, Bit 7)
26. VCC (+5V Power Supply)
27. RD (Read Control)
28. WR (Write Control)
29. CS (Chip Select)
30. A0 (Address Bit 0)
31. A1 (Address Bit 1)
32. A2 (Address Bit 2)
33. INT (Interrupt Request)
34. RESET (Reset Input)
35. CLK (Clock Input)
36. XTAL1 (Crystal Oscillator Input)
37. XTAL2 (Crystal Oscillator Output)
38. NC (No Connection)
39. NC (No Connection)
40. VCC (+5V Power Supply)

Functional Features

The IQ82C55AZ offers several functional features that enhance its usability in microprocessor-based systems:

1. Programmable I/O Ports: The IC allows customization of the I/O ports based on specific system requirements, providing flexibility in data transfer and control.
2. Interrupt Handling: Built-in interrupt handling capabilities enable efficient management of external events, ensuring timely response and system synchronization.
3. Versatile Operating Modes: The IQ82C55AZ supports three distinct operating modes, allowing adaptation to different communication protocols and system configurations.
4. Low Power Consumption: The IC operates at low power consumption levels, minimizing energy usage and extending battery life in portable devices.

Advantages

• Versatile I/O capabilities suitable for a wide range of applications.
• Customizable I/O ports for flexible system integration.
• Built-in interrupt handling enhances system responsiveness.
• Low power consumption for energy-efficient operation.

Disadvantages

• Limited number of I/O ports may restrict the connectivity options in complex systems.
• Requires external crystal oscillator for clock generation, adding additional components to the system.

Working Principles

The IQ82C55AZ acts as an interface between the microprocessor and peripheral devices. It receives commands and data from the microprocessor and transfers