AT28HC256-90LM/883-696

Product Overview

Category

The AT28HC256-90LM/883-696 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 AT28HC256-90LM/883-696 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, this chip provides ample space for storing critical data.
• Extended temperature range: The -90LM/883-696 variant is designed to operate reliably in extreme temperature conditions, making it suitable for industrial and military applications.

Package

The AT28HC256-90LM/883-696 is available in a ceramic dual-inline package (DIP), which ensures durability and ease of integration into circuit boards.

Essence

The essence of this product lies in its ability to store and retrieve data reliably, even in harsh operating environments. Its high-speed operation and low power consumption make it a versatile choice for various electronic applications.

Packaging/Quantity

This EEPROM chip is typically packaged in tubes or trays, with each package containing a specified quantity of chips. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Operating voltage: 2.7V to 5.5V
• Access time: 90 nanoseconds
• Data retention: Up to 10 years
• Endurance: 100,000 write cycles
• Interface: Serial Peripheral Interface (SPI)
• Package type: Ceramic DIP

Detailed Pin Configuration

The AT28HC256-90LM/883-696 chip has a total of 28 pins, each serving a specific function. The pin configuration is as follows:

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)

Note: The remaining pins are not listed here for brevity.

Functional Features

• Random access: The chip allows random access to any memory location, enabling efficient data retrieval.
• Byte-wise programming: It supports byte-wise programming, allowing selective modification of specific data bytes without affecting the entire memory contents.
• Hardware and software protection: The AT28HC256-90LM/883-696 provides hardware and software protection mechanisms to prevent unauthorized access or accidental modifications to stored data.
• High endurance: With a capability of enduring 100,000 write cycles, this EEPROM chip ensures long-term reliability.

Advantages and Disadvantages

Advantages

• Fast read and write access times enable quick data retrieval.
• Low power consumption makes it suitable for battery-powered devices.
• Extended temperature range allows reliable operation in harsh environments.
• Ample storage capacity for various applications.

Disadvantages

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

Working Principles

The AT28HC256-90LM/883-696 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 and reprogrammed using electrical signals.

During read operations, the chip applies appropriate voltages to the memory cells and senses the resulting electrical currents to determine the stored data. Write operations involve applying higher voltages to modify the charge levels within the floating gate transistors.

Detailed Application Field Plans

The AT28HC256-90LM/883-696 finds applications in various fields, including:

1. Microcontrollers: Used for storing firmware, configuration data, and calibration parameters.
2. Computers: Employed in BIOS chips, where critical system information is stored.
3. Communication systems: Utilized for storing network settings, encryption keys, and device-specific configurations.
4. Industrial automation: Used for data logging, parameter storage, and firmware updates in industrial control systems.
5. Military and aerospace: Deployed in mission-critical systems that require reliable non-volatile memory in extreme environments.

Detailed and Complete Alternative Models

1. AT28C256: A lower-speed variant of the same capacity, suitable for applications with less stringent timing requirements.
2. AT29C256: A similar EEPROM chip with a parallel interface, offering faster programming times but requiring more pins.
3. AT24C256: An I