AT28HC256-90SA

Product Overview

Category

AT28HC256-90SA 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 communication systems.

Characteristics

• High-speed operation: The AT28HC256-90SA 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 minimize power consumption, making it ideal for battery-powered devices.
• Large storage capacity: With a capacity of 256 kilobits, the AT28HC256-90SA provides ample space for storing critical data.
• Reliable data retention: The chip ensures data integrity with its excellent endurance and retention characteristics.
• 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 AT28HC256-90SA is available in a surface-mount 32-lead plastic small outline package (SOIC). It is typically sold in reels containing multiple units.

Specifications

• Operating Voltage: 2.7V - 5.5V
• Capacity: 256 kilobits (32 kilobytes)
• Access Time: 90 nanoseconds
• Interface: Serial I/O
• Package Type: SOIC-32

Pin Configuration

The AT28HC256-90SA features a total of 32 pins, each serving a specific function. Here is a detailed pin configuration:

1. Chip Enable (CE)
2. Output Enable (OE)
3. Write Enable (WE)
4. Address Inputs (A0-A14)
5. Data Inputs/Outputs (I/O0-I/O7)
6. Supply Voltage (VCC)
7. Ground (GND)

(Continued for pins 8-32)

Functional Features

The AT28HC256-90SA offers several functional features that enhance its usability:

1. Byte and Page Write: The chip supports both byte and page write operations, allowing flexible data storage and retrieval.
2. Software Data Protection: It provides software-controlled protection mechanisms to prevent accidental data corruption or erasure.
3. High-Speed Read: With a fast access time of 90 nanoseconds, the AT28HC256-90SA enables quick data retrieval, enhancing system performance.
4. Extended Temperature Range: This EEPROM chip can operate reliably within a wide temperature range, making it suitable for various environments.

Advantages and Disadvantages

Advantages

• High-speed operation improves overall system performance.
• Low power consumption extends battery life in portable devices.
• Large storage capacity accommodates extensive data requirements.
• Reliable data retention ensures long-term integrity.
• Wide operating voltage range enhances compatibility with different systems.

Disadvantages

• Limited write endurance compared to other non-volatile memory technologies.
• Higher cost per bit compared to some alternative memory solutions.
• Requires additional control signals for proper operation.

Working Principles

The AT28HC256-90SA utilizes electrically erasable programmable read-only memory technology. It stores data by trapping electrical charges within floating gate transistors. These charges represent binary information, which can be read, written, or erased electronically.

During a write operation, an electric field is applied to the floating gate, allowing electrons to tunnel through a thin oxide layer and modify the charge state. Reading involves sensing the charge level on the floating gate, while erasing clears the stored charges using specialized erase algorithms.

Detailed Application Field Plans

The AT28HC256-90SA finds applications in various fields, including:

1. Embedded Systems: It is widely used in microcontrollers and embedded systems for storing firmware, configuration data, and calibration parameters.
2. Communication Systems: The chip can be utilized in networking devices, routers, and switches to store critical system information and configuration settings.
3. Automotive Electronics: It is suitable for automotive applications such as engine control units (ECUs), infotainment systems, and instrument clusters.
4. Industrial Automation: The AT28HC256-90SA can be employed in programmable logic controllers (PLCs) and industrial control systems for data storage and parameter retention.

Detailed Alternative Models

Several alternative models with similar functionality are available in the market. Some notable alternatives to the AT28HC256-90SA include:

1. AT28C256: This EEPROM chip offers a slower access time but provides a lower cost per bit.
2. AT24C256: It is a serial EEPROM with a similar capacity and interface but operates at a lower voltage range.
3. 25LC256: This SPI-compatible EEPROM chip offers faster access times and a smaller package size.

These alternative models