AT28HC256-70JU-T

Product Overview

Category

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

Use

This product is primarily used for non-volatile data storage in various electronic devices such as microcontrollers, computers, and consumer electronics.

Characteristics

• High-speed operation: The AT28HC256-70JU-T offers fast read and write operations, making it suitable for applications requiring quick access to stored data.
• Low power consumption: This EEPROM chip is designed to minimize power consumption, making it ideal for battery-powered devices.
• Large storage capacity: With a capacity of 256 kilobits (32 kilobytes), the AT28HC256-70JU-T can store a significant amount of data.
• Reliable data retention: The EEPROM technology ensures that data remains intact even when power is disconnected.
• Extended temperature range: This chip can operate reliably within a wide temperature range, from -40°C to +85°C.

Package and Quantity

The AT28HC256-70JU-T is available in a 32-pin PLCC (Plastic Leaded Chip Carrier) package. It is typically sold in reels containing multiple units.

Specifications

• Supply voltage: 2.7V to 5.5V
• Operating current: 10 mA (typical)
• Standby current: 1 µA (typical)
• Access time: 70 ns (maximum)
• Data retention: 10 years (minimum)
• Endurance: 100,000 write cycles (minimum)

Pin Configuration

The AT28HC256-70JU-T has a total of 32 pins. The pin configuration is as follows:

┌───┬───┬───┬───┬───┬───┬───┬───┐ │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ ├───┼───┼───┼───┼───┼───┼───┼───┤ │ 9 │10 │11 │12 │13 │14 │15 │16 │ ├───┼───┼───┼───┼───┼───┼───┼───┤ │17 │18 │19 │20 │21 │22 │23 │24 │ ├───┼───┼───┼───┼───┼───┼───┼───┤ │25 │26 │27 │28 │29 │30 │31 │32 │ └───┴───┴───┴───┴───┴───┴───┴───┘

Functional Features

• Byte-wise programmable: The AT28HC256-70JU-T allows individual bytes to be programmed or erased, providing flexibility in data storage.
• Hardware and software write protection: This chip offers various methods to protect stored data from accidental modification, ensuring data integrity.
• Automatic page write: The device supports automatic page write operations, enabling efficient programming of multiple bytes at once.
• Software-controlled write timing: The write cycle can be controlled through software, allowing precise timing adjustments for specific applications.

Advantages and Disadvantages

Advantages

• High-speed operation enables quick access to stored data.
• Low power consumption prolongs battery life in portable devices.
• Large storage capacity accommodates a significant amount of data.
• Reliable data retention ensures data integrity over extended periods.
• Extended temperature range allows operation in various environments.

Disadvantages

• Limited endurance of 100,000 write cycles may be a constraint for certain applications.
• The PLCC package may require additional space compared to smaller form factors.

Working Principles

The AT28HC256-70JU-T utilizes EEPROM technology, which combines the benefits of both electrically erasable and programmable memory. It stores data by trapping electrical charges within floating gate transistors. These charges can be erased or programmed using specific voltage levels applied to the control pins.

During read operations, the stored charge is sensed, allowing retrieval of the stored data. Write operations involve applying appropriate voltages to program or erase specific memory locations.

Application Field Plans

The AT28HC256-70JU-T finds application in various fields, including: 1. Microcontrollers: Used for storing firmware, configuration data, and non-volatile variables. 2. Computers: Employed in BIOS chips, expansion cards, and