AT28HC256-12JU

Product Overview

Category

AT28HC256-12JU 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 AT28HC256-12JU offers fast read and write access times, making it suitable for applications requiring quick data retrieval.
• Low power consumption: This EEPROM chip is designed to operate efficiently with minimal power requirements, making it ideal for battery-powered devices.
• Large storage capacity: With a capacity of 256 kilobits (32 kilobytes), the AT28HC256-12JU provides ample space for storing critical data.
• High endurance: It supports a minimum of 100,000 erase/write cycles, ensuring reliable and long-lasting performance.
• Wide operating voltage range: The chip can function within a voltage range of 2.7V to 5.5V, allowing compatibility with various systems.
• Extended temperature range: The AT28HC256-12JU can operate reliably in temperatures ranging from -40°C to +85°C, making it suitable for harsh environments.

Package and Quantity

The AT28HC256-12JU is available in a 32-pin PLCC (Plastic Leaded Chip Carrier) package. It is typically sold in reels or tubes containing multiple units, with quantities varying based on customer requirements.

Specifications

• Organization: 32K x 8 bits
• Access Time: 120 ns
• Supply Voltage: 2.7V to 5.5V
• Standby Current: 10 µA (typical)
• Operating Temperature Range: -40°C to +85°C
• Endurance: 100,000 erase/write cycles (minimum)
• Data Retention: 10 years (minimum)

Pin Configuration

The AT28HC256-12JU features a 32-pin PLCC package with the following pin configuration:

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

Functional Features

• Byte-wise Read and Write Operations: The AT28HC256-12JU allows individual byte-level access for reading and writing data.
• Hardware Data Protection: It provides hardware protection mechanisms to prevent accidental modification or erasure of stored data.
• Software Write Protection: The chip supports software-controlled write protection, allowing specific memory areas to be locked from further modifications.
• Automatic Page Write: This feature enables efficient programming of multiple bytes within a single page, reducing overall write time.

Advantages and Disadvantages

Advantages

• High-speed operation facilitates quick data access.
• Low power consumption prolongs battery life in portable devices.
• Large storage capacity accommodates extensive data requirements.
• Wide operating voltage range ensures compatibility with various systems.
• Extended temperature range allows usage in harsh environments.
• Hardware and software protection mechanisms enhance data security.

Disadvantages

• Limited storage capacity compared to other memory technologies like Flash.
• Relatively higher cost per bit compared to larger capacity memory chips.
• Limited endurance compared to some newer non-volatile memory technologies.

Working Principles

The AT28HC256-12JU utilizes EEPROM technology, which allows for non-volatile data storage. It employs a combination of floating-gate transistors and electric fields to store and retrieve data. The chip uses electrical signals to control the charge on the floating gates, enabling data to be written or read from specific memory locations.

Application Field Plans

The AT28HC256-12JU finds applications in various fields, including: 1. Microcontrollers: Used for storing firmware, configuration data, and calibration parameters. 2. Computers: Employed in BIOS (Basic Input/Output System) chips for storing system initialization code. 3. Consumer Electronics: Utilized in devices such as smart TVs, set-top boxes, and gaming consoles for data storage purposes.

Alternative Models

Several alternative models with similar functionality are available in the market, including: - AT28C256