AT28HC64B-90PU

Product Overview

Category

AT28HC64B-90PU 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 AT28HC64B-90PU 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.
• Non-volatile memory: The stored data remains intact even when the power supply is disconnected or interrupted.
• High endurance: The AT28HC64B-90PU can withstand a large number of erase/write cycles, ensuring long-term reliability.

Package

The AT28HC64B-90PU is available in a standard 28-pin plastic DIP (Dual In-line Package), which facilitates easy integration into electronic circuits.

Essence

The essence of the AT28HC64B-90PU lies in its ability to provide reliable, non-volatile data storage with high-speed operation and low power consumption.

Packaging/Quantity

This product is typically packaged in tubes or trays, with each package containing a specific quantity of AT28HC64B-90PU chips. The exact quantity may vary depending on the supplier and customer requirements.

Specifications

• Memory capacity: 64 kilobits (8 kilobytes)
• Operating voltage: 2.7V to 5.5V
• Access time: 90 nanoseconds
• Data retention: Up to 10 years
• Endurance: Minimum 100,000 erase/write cycles
• Interface: Parallel

Detailed Pin Configuration

The AT28HC64B-90PU features a 28-pin configuration with the following pin assignments:

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. VSS - Ground
10. DQ0 - Data Input/Output
11. DQ1 - Data Input/Output
12. DQ2 - Data Input/Output
13. DQ3 - Data Input/Output
14. DQ4 - Data Input/Output
15. DQ5 - Data Input/Output
16. DQ6 - Data Input/Output
17. DQ7 - Data Input/Output
18. WE - Write Enable
19. OE - Output Enable
20. CE - Chip Enable
21. NC - No Connection
22. VCC - Power Supply
23. NC - No Connection
24. NC - No Connection
25. NC - No Connection
26. NC - No Connection
27. NC - No Connection
28. NC - No Connection

Functional Features

The AT28HC64B-90PU offers the following functional features:

• Byte-wise and page-wise write operations: Allows for efficient programming of individual bytes or entire pages of data.
• Hardware and software data protection: Provides mechanisms to prevent accidental modification or erasure of stored data.
• Automatic erase-before-write: Ensures that memory cells are erased before new data is written, eliminating the need for separate erase operations.

Advantages and Disadvantages

Advantages

• High-speed operation enables quick access to stored data.
• Low power consumption prolongs battery life in portable devices.
• Non-volatile memory ensures data retention even during power interruptions.
• High endurance allows for frequent read/write operations without compromising reliability.

Disadvantages

• Limited storage capacity compared to other memory technologies.
• Relatively higher cost per unit compared to some alternative memory solutions.

Working Principles

The AT28HC64B-90PU utilizes EEPROM technology, which combines the advantages of both Electrically Erasable Programmable Read-Only Memory (EEPROM) and Flash memory. It stores data in floating-gate transistors, which can be electrically programmed and erased.

During write operations, the desired data is stored by applying appropriate voltage levels to the address and data pins. The memory cells are programmed by trapping charge in the floating gate, while erasing is achieved by removing the trapped charge.

Read operations involve accessing the desired memory location and retrieving the stored data. The chip's control signals, such as Chip Enable (CE), Output Enable (OE), and Write Enable (WE), facilitate these operations.

Detailed Application Field Plans

The AT28HC64B-90PU finds applications in various fields, including:

1. Microcontrollers: Used for