AT28HC256E-12PI

Product Overview

Category

AT28HC256E-12PI 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 AT28HC256E-12PI 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), this chip provides ample space for storing critical data.
• Reliable data retention: The AT28HC256E-12PI ensures data integrity with a guaranteed minimum retention time of 10 years.

Package and Quantity

The AT28HC256E-12PI is available in a 28-pin DIP (Dual In-line Package) format. It is typically sold in quantities of one or more units per package.

Specifications

• Supply voltage: 2.7V to 5.5V
• Operating temperature range: -40°C to +85°C
• Access time: 120 ns
• Organization: 32K x 8 bits
• Endurance: 100,000 write cycles
• Data retention: 10 years

Pin Configuration

The AT28HC256E-12PI features a 28-pin configuration with the following pin assignments:

1. Chip Enable (CE)
2. Output Enable (OE)
3. Write Enable (WE)
4. Address Inputs (A0-A14)
5. Data Inputs/Outputs (DQ0-DQ7)
6. Supply Voltage (VCC)
7. Ground (GND)

Functional Features

Read Operation

When the Chip Enable (CE) and Output Enable (OE) pins are both active low, the AT28HC256E-12PI allows data to be read from the selected memory location. The output data is available on the Data Outputs (DQ0-DQ7) pins.

Write Operation

To write data into the memory, the Chip Enable (CE), Output Enable (OE), and Write Enable (WE) pins must be activated in the correct sequence. The data to be written is provided on the Data Inputs (DQ0-DQ7) pins.

Erase Operation

The AT28HC256E-12PI does not support a full chip erase operation. However, individual bytes or pages can be erased by following the specified programming algorithms.

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 extensive data requirements.
• Reliable data retention ensures long-term integrity of stored information.

Disadvantages

• Limited erase options compared to some other EEPROM chips.
• Higher cost compared to traditional ROM or RAM alternatives.
• Limited compatibility with certain older microcontrollers or systems.

Working Principles

The AT28HC256E-12PI utilizes a combination of electrically controlled floating gate transistors to store and retrieve data. When programmed, charges are trapped in the floating gate, altering the transistor's threshold voltage and representing a logical state. These charges can be removed through specific programming sequences, allowing for data modification.

Application Field Plans

The AT28HC256E-12PI finds applications in various fields, including: 1. Embedded systems: Used for firmware storage in microcontrollers and system-on-chip devices. 2. Industrial automation: Provides non-volatile storage for critical configuration data and parameter settings. 3. Automotive electronics: Stores calibration data, firmware, and other essential information in automotive control units. 4. Consumer electronics: Used in devices such as smart TVs, set-top boxes, and gaming consoles for data storage.

Alternative Models

1. AT28C256-15PU: Similar 256 kilobit EEPROM chip with a slower access time of 150 ns.
2. AT28HC256E-12SI: Surface mount version of the AT28HC256E-12PI with identical specifications.
3. AT28HC256E-12PC: Plastic leaded chip carrier (PLCC) package variant of the AT28HC256E-12PI.

These alternative models offer similar functionality but may differ in package type or operating characteristics.

In conclusion, the AT28HC256E-12PI is a high-speed, low-power EEPROM chip that provides reliable non-volatile data storage. With its large capacity and versatile applications, it serves as a crucial component in various electronic devices across different industries.