AT28HC256-70JI

Product Overview

Category

AT28HC256-70JI belongs to the category of high-speed, low-power Electrically Erasable Programmable Read-Only Memory (EEPROM) chips.

Use

This product is commonly used in electronic devices for non-volatile data storage. It allows for easy and efficient retrieval of stored information even when power is turned off.

Characteristics

• High-speed operation: The AT28HC256-70JI offers fast read and write operations, making it suitable for applications that require quick access to data.
• Low-power consumption: This EEPROM chip is designed to minimize power usage, making it ideal for battery-powered devices.
• Large storage capacity: With a capacity of 256 kilobits, this chip can store a significant amount of data.
• Reliable data retention: The AT28HC256-70JI ensures data integrity with its excellent endurance and long-term reliability.
• Wide operating voltage range: It can operate within a voltage range of 2.7V to 5.5V, providing flexibility in various electronic systems.

Package and Quantity

The AT28HC256-70JI is available in a 32-pin plastic J-lead package. It is typically sold in reels or tubes, with quantities varying based on customer requirements.

Specifications

• Capacity: 256 kilobits (32 kilobytes)
• Organization: 32K x 8 bits
• Operating Voltage Range: 2.7V to 5.5V
• Access Time: 70 nanoseconds
• Standby Current: 100 microamps (max)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The AT28HC256-70JI has a total of 32 pins, which are assigned specific functions as follows:

1. A16
2. A14
3. A12
4. A7
5. A6
6. A5
7. A4
8. A3
9. A2
10. A1
11. A0
12. VCC
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. A15
27. A13
28. A8
29. A9
30. A11
31. A10
32. NC

Functional Features

• Byte and Page Write: The AT28HC256-70JI supports both byte and page write operations, allowing for flexible data storage.
• Hardware Data Protection: This EEPROM chip provides hardware protection mechanisms to prevent accidental writes or erasures, ensuring data integrity.
• Software Data Protection: It also offers software-controlled protection features, enabling users to selectively protect specific memory areas.
• High-Speed Read Access: With a fast access time of 70 nanoseconds, this chip enables quick retrieval of stored data.
• Low-Power Consumption: The AT28HC256-70JI is designed to minimize power usage, making it suitable for battery-powered devices.

Advantages and Disadvantages

Advantages

• High-speed operation allows for quick access to stored data.
• Low-power consumption extends battery life in portable devices.
• Large storage capacity accommodates a significant amount of data.
• Reliable data retention ensures long-term integrity.
• Wide operating voltage range provides compatibility with various systems.

Disadvantages

• Limited storage capacity compared to other memory technologies.
• Relatively higher cost per bit compared to some alternatives.
• Limited endurance compared to other non-volatile memory technologies.

Working Principles

The AT28HC256-70JI utilizes EEPROM technology, which allows for electrically erasing and reprogramming of data. It stores information in a grid of memory cells, with each cell capable of holding one bit of data. The chip uses electrical signals to write, read, and erase data from these cells.

During a write operation, the chip applies a high voltage to the selected memory cell, causing electrons to tunnel through an insulating layer and alter the charge state of the cell. Reading data involves detecting the charge state of each memory cell, while erasing data involves resetting all memory cells to their initial state.

Detailed Application Field Plans

The AT28HC256-70JI finds applications in various electronic devices that require non-volatile data storage. Some common application fields include:

1. Consumer Electronics: Used in digital cameras, MP3 players, and handheld gaming devices for storing user data, firmware, and configuration settings.
2. Automotive Systems: Employed in automotive electronics for storing critical data such as engine parameters, vehicle diagnostics, and firmware updates.
3. Industrial Control Systems