AT27C020-55PI

Product Overview

Category: Integrated Circuit (IC)

Use: The AT27C020-55PI is a programmable read-only memory (PROM) IC. It is commonly used for storing fixed data or program code that needs to be retained even when power is turned off.

Characteristics: - Non-volatile memory - 2-megabit capacity - High-speed operation - Low power consumption - Durable and reliable

Package: The AT27C020-55PI is available in a 32-pin plastic dual in-line package (PDIP). This package provides easy installation and compatibility with standard IC sockets.

Essence: The essence of the AT27C020-55PI is its ability to store data permanently, making it ideal for applications where non-volatile memory is required.

Packaging/Quantity: The AT27C020-55PI is typically sold in reels or tubes, with each reel or tube containing a specific quantity of ICs. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Memory Capacity: 2 megabits (256 kilobytes)
• Operating Voltage: 5V
• Access Time: 55 nanoseconds
• Standby Current: 100 microamps (max)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The AT27C020-55PI has a total of 32 pins, which are assigned specific functions as follows:

1. A16 - Address Input
2. A15 - Address Input
3. A12 - Address Input
4. A7 - Address Input
5. A6 - Address Input
6. A5 - Address Input
7. A4 - Address Input
8. A3 - Address Input
9. A2 - Address Input
10. A1 - Address Input
11. A0 - Address Input
12. VPP - Programming Voltage Input
13. OE - Output Enable
14. CE - Chip Enable
15. WE - Write Enable
16. I/O0 - Data Input/Output
17. I/O1 - Data Input/Output
18. I/O2 - Data Input/Output
19. I/O3 - Data Input/Output
20. I/O4 - Data Input/Output
21. I/O5 - Data Input/Output
22. I/O6 - Data Input/Output
23. I/O7 - Data Input/Output
24. VCC - Power Supply
25. GND - Ground
26. NC - No Connection
27. NC - No Connection
28. NC - No Connection
29. NC - No Connection
30. NC - No Connection
31. NC - No Connection
32. NC - No Connection

Functional Features

• Non-volatile memory: The AT27C020-55PI retains data even when power is turned off, making it suitable for applications requiring permanent storage.
• High-speed operation: With an access time of 55 nanoseconds, this IC allows for fast read and write operations.
• Low power consumption: The AT27C020-55PI consumes minimal power during standby, reducing energy requirements.
• Durable and reliable: Designed to withstand harsh operating conditions, this IC offers long-term reliability.

Advantages and Disadvantages

Advantages: - Permanent storage of data - Fast operation - Low power consumption - Reliable performance

Disadvantages: - Limited capacity (2 megabits) - Cannot be reprogrammed once programmed

Working Principles

The AT27C020-55PI uses a technology called electrically erasable programmable read-only memory (EEPROM). It stores data by programming individual memory cells with electrical charges. Once programmed, the data remains intact until it is erased using specialized equipment.

During operation, the IC receives address inputs to select the desired memory location. The chip enable (CE) and output enable (OE) signals control the read and write operations. When reading data, the output enable signal is activated, allowing the data to be accessed from the selected memory location. When writing data, the chip enable and write enable (WE) signals are activated, enabling the programming of new data into the selected memory location.

Detailed Application Field Plans

The AT27C020-55PI finds applications in various fields, including:

1. Embedded Systems: Used for storing firmware or boot code in microcontrollers and other embedded devices.
2. Automotive Electronics: Employed in automotive systems for storing critical data such as engine management programs or calibration tables.
3. Industrial Control Systems: Utilized in industrial automation and control systems for storing configuration data or program code.
4. Consumer Electronics: Integrated into electronic devices like gaming consoles, set-top boxes, or digital cameras for storing firmware or configuration data