AT28HC256-90TA

Product Overview

Category

AT28HC256-90TA belongs to the category of high-speed, low-power Electrically Erasable Programmable Read-Only Memory (EEPROM) chips.

Use

This product is commonly used in electronic devices for non-volatile data storage. It allows for easy and efficient retrieval of stored information even when power is removed.

Characteristics

• High speed: The AT28HC256-90TA offers fast read and write operations, making it suitable for applications that require quick access to data.
• Low power consumption: This EEPROM chip is designed to minimize power usage, making it ideal for battery-powered devices.
• Large capacity: With a storage capacity of 256 kilobits, this chip can store a significant amount of data.
• Reliable data retention: The AT28HC256-90TA ensures data integrity with its reliable storage capabilities.
• Extended temperature range: This chip can operate within a wide temperature range, making it suitable for various environments.

Package

The AT28HC256-90TA comes in a standard 28-pin Dual In-Line Package (DIP), which is widely used in the electronics industry.

Essence

The essence of the AT28HC256-90TA lies in its ability to provide non-volatile memory storage with high speed, low power consumption, and reliable data retention.

Packaging/Quantity

This product is typically packaged in reels or tubes, with each containing a specific quantity of chips. The exact packaging and quantity may vary depending on the manufacturer.

Specifications

• Part Number: AT28HC256-90TA
• Memory Type: Electrically Erasable Programmable Read-Only Memory (EEPROM)
• Capacity: 256 kilobits
• Operating Voltage: 2.7V - 5.5V
• Speed: 90 nanoseconds (access time)
• Package Type: 28-pin Dual In-Line Package (DIP)

Detailed Pin Configuration

The AT28HC256-90TA has a total of 28 pins, each serving a specific function. The pin configuration is as follows:

1. A0 - Address Input
2. A1 - Address Input
3. A2 - Address Input
4. A3 - Address Input
5. A4 - Address Input
6. A5 - Address Input
7. A6 - Address Input
8. A7 - Address Input
9. A8 - Address Input
10. A9 - Address Input
11. A10 - Address Input
12. A11 - Address Input
13. A12 - Address Input
14. A13 - Address Input
15. A14 - Address Input
16. /OE - Output Enable
17. /WE - Write Enable
18. VSS - Ground
19. DQ0 - Data Input/Output
20. DQ1 - Data Input/Output
21. DQ2 - Data Input/Output
22. DQ3 - Data Input/Output
23. DQ4 - Data Input/Output
24. DQ5 - Data Input/Output
25. DQ6 - Data Input/Output
26. DQ7 - Data Input/Output
27. VCC - Power Supply
28. /CE - Chip Enable

Functional Features

The AT28HC256-90TA offers the following functional features:

• Random access: Allows for direct access to any memory location.
• Byte-level operations: Supports byte-level read and write operations.
• Hardware data protection: Provides hardware-based protection against accidental data modification.
• High endurance: Can withstand a large number of erase/write cycles.
• Low standby current: Consumes minimal power when not in use.

Advantages and Disadvantages

Advantages

• High-speed operation enables quick data access.
• Low power consumption makes it suitable for battery-powered devices.
• Large storage capacity accommodates a significant amount of data.
• Reliable data retention ensures data integrity.
• Extended temperature range allows for versatile usage.

Disadvantages

• Limited storage capacity compared to other memory technologies.
• Relatively higher cost per bit compared to some alternatives.
• Requires additional circuitry for proper interfacing with the microcontroller.

Working Principles

The AT28HC256-90TA utilizes EEPROM technology, which allows for non-volatile data storage. It uses a combination of electrically controlled gates and floating gate transistors to store and retrieve data. When data is written, charges are trapped in the floating gate, altering the transistor's behavior. These charges can be removed during an erase operation, allowing the transistor to return to its original state. The stored data can be accessed by applying appropriate voltage levels to the address and control pins.

Detailed Application Field Plans

The AT28HC256-90TA finds applications in various electronic devices that require non