AT28HC256-90TI

Product Overview

Category

AT28HC256-90TI belongs to the category of high-speed, high-capacity EEPROM (Electrically Erasable Programmable Read-Only Memory) 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 AT28HC256-90TI offers fast read and write operations, making it suitable for applications that require quick access to stored data.
• High capacity: With a storage capacity of 256 kilobits (32 kilobytes), this EEPROM chip provides ample space for storing critical information.
• Reliable data retention: The AT28HC256-90TI ensures long-term data integrity with its excellent data retention capabilities.
• Low power consumption: This chip is designed to operate efficiently with minimal power consumption, making it suitable for battery-powered devices.
• Wide operating voltage range: It can function reliably within a voltage range of 2.7V to 5.5V, providing flexibility in various electronic systems.

Package and Quantity

The AT28HC256-90TI is available in a standard 28-pin dual in-line package (DIP). It is commonly sold in reels or tubes containing multiple units, typically in quantities of 25 or more.

Specifications

• Storage Capacity: 256 kilobits (32 kilobytes)
• Operating Voltage Range: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Interface: Serial I2C (Inter-Integrated Circuit)
• Write Time: 5ms (typical)
• Data Retention: 10 years (minimum)

Pin Configuration

The AT28HC256-90TI features a 28-pin configuration with the following pin assignments:

1. Chip Enable (CE)
2. Output Enable (OE)
3. Write Enable (WE)
4. Serial Data Input/Output (SDI/SDO)
5. Serial Clock (SCK) 6-13. Address Inputs (A0-A7) 14-28. Data Inputs/Outputs (D0-D13)

Functional Features

• Random access: The AT28HC256-90TI allows for random access to any memory location, enabling efficient data retrieval.
• Byte and page write operations: It supports both byte-level and page-level write operations, providing flexibility in storing and updating data.
• Hardware and software protection: This chip offers various protection mechanisms, including write protection pins and software-controlled protection, ensuring data security.
• High endurance: With a minimum of 100,000 write cycles, the AT28HC256-90TI is highly durable and suitable for applications that require frequent data updates.

Advantages and Disadvantages

Advantages

• Fast read and write operations
• High storage capacity
• Reliable data retention
• Low power consumption
• Wide operating voltage range
• Random access capability
• Flexible write operations
• Data protection mechanisms
• High endurance

Disadvantages

• Limited storage capacity compared to larger EEPROM chips
• Relatively higher cost per kilobit compared to lower-capacity alternatives

Working Principles

The AT28HC256-90TI utilizes EEPROM technology, which allows for electrically erasing and reprogramming data. It stores information in a grid of memory cells, with each cell capable of holding one bit of data. The chip uses a combination of transistors and capacitors to store and retrieve data based on electrical charges.

During write operations, the chip applies a high voltage to the selected memory cells, causing electrons to tunnel through an insulating layer and modify the charge stored in the floating gate. Reading data involves sensing the charge level in each memory cell and converting it into binary information.

Detailed Application Field Plans

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

1. Microcontrollers: Used for storing firmware, configuration settings, and calibration data.
2. Computers: Employed in BIOS (Basic Input/Output System) chips for storing system parameters and boot code.
3. Consumer Electronics: Utilized in devices such as smart TVs, set-top boxes, and digital cameras for storing user preferences, firmware updates, and other critical data.

Alternative Models

Several alternative models with similar specifications and functionalities are available in the market. Some notable alternatives to the AT28HC256-90TI include:

1. AT28C256: A lower-speed version of the same capacity EEPROM chip.
2. AT24C256: An I2C-compatible EEPROM chip with the same capacity but different pin configuration.
3. 25LC256: A SPI (Serial Peripheral Interface) EEPROM chip with similar capacity and functionality.

These alternative models provide options for designers based on specific requirements and compatibility considerations.

In conclusion, the AT