AT27C020-55JU

Product Overview

Category

AT27C020-55JU belongs to the category of programmable read-only memory (PROM) chips.

Use

The AT27C020-55JU chip is primarily used for storing data that needs to be permanently written and cannot be modified or erased. It is commonly used in applications where non-volatile memory is required.

Characteristics

• Non-volatile: The data stored in the AT27C020-55JU chip remains intact even when power is turned off.
• High storage capacity: The chip has a storage capacity of 2 megabits (256 kilobytes).
• Fast access time: With an access time of 55 nanoseconds, the chip provides quick retrieval of stored data.
• Low power consumption: The AT27C020-55JU chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C020-55JU chip is available in a 32-pin PLCC (Plastic Leaded Chip Carrier) package.

Essence

The essence of the AT27C020-55JU chip lies in its ability to store data permanently, ensuring data integrity and reliability.

Packaging/Quantity

The AT27C020-55JU chip is typically packaged in reels or tubes, with each reel or tube containing a specific quantity of chips. The exact packaging and quantity may vary depending on the manufacturer.

Specifications

• Storage Capacity: 2 Megabits (256 Kilobytes)
• Access Time: 55 Nanoseconds
• Operating Voltage: 5V
• Package Type: 32-pin PLCC
• Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The AT27C020-55JU chip has a total of 32 pins, which are assigned specific functions. The pin configuration is as follows:

1. A16
2. A15
3. A12
4. A7
5. A6
6. A5
7. A4
8. A3
9. A2
10. A1
11. A0
12. VPP
13. OE#
14. CE#
15. WE#
16. I/O0
17. I/O1
18. I/O2
19. I/O3
20. I/O4
21. I/O5
22. I/O6
23. I/O7
24. NC
25. GND
26. VCC
27. A8
28. A9
29. A11
30. A10
31. A14
32. A13

Functional Features

The AT27C020-55JU chip offers the following functional features:

• Easy programming: The chip can be programmed using standard PROM programming equipment.
• High reliability: The stored data remains intact even under harsh environmental conditions.
• Data protection: The chip features a write enable (WE#) pin and an output enable (OE#) pin to control read and write operations, providing data security.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data integrity.
• High storage capacity for various applications.
• Fast access time allows for quick retrieval of data.
• Low power consumption extends battery life in portable devices.

Disadvantages

• Once programmed, the data cannot be modified or erased.
• Limited storage capacity compared to other memory technologies.

Working Principles

The AT27C020-55JU chip utilizes a one-time programmable technology. During programming, electrical charges are applied to specific memory cells, altering their state to represent the desired data. Once programmed, the data remains stored in the chip permanently and can be accessed as needed.

Detailed Application Field Plans

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

1. Embedded Systems: Used for firmware storage in microcontrollers and other embedded devices.
2. Automotive Electronics: Stores critical data such as calibration values and configuration settings.
3. Industrial Control Systems: Provides non-volatile memory for storing program code and configuration data.
4. Medical Devices: Used for storing patient data, device configurations, and firmware updates.
5. Consumer Electronics: Enables permanent storage of system software and firmware in devices like gaming consoles and set-top boxes.

Detailed and Complete Alternative Models

1. AT27C010-45PU: 1 Megabit (128 Kilobytes) PROM chip with a slower access time of 45 nanoseconds.
2. AT27C040-70PU: 4 Megabit (512 Kilobytes) PROM chip with a faster access time of 70 nanoseconds.
3. AT27C080-90PU: 8 Megabit (1 Megabyte) PROM chip with a slower access time