AT28HC256-70PC

Product Overview

Category

AT28HC256-70PC 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 AT28HC256-70PC offers fast read and write access times, making it suitable for applications that require 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 (32 kilobytes), the AT28HC256-70PC provides ample space for storing critical data.
• Reliable data retention: The EEPROM technology ensures that data remains intact even when the power supply is disconnected.
• Extended temperature range: This chip can operate reliably within a wide temperature range, making it suitable for both industrial and consumer applications.

Package and Quantity

The AT28HC256-70PC is available in a 28-pin plastic dual in-line package (PDIP). It is typically sold in reels or tubes, with a quantity of 25 units per package.

Specifications

• Supply voltage: 2.7V to 5.5V
• Operating temperature range: -40°C to +85°C
• Access time: 70 nanoseconds
• Standby current: 100 microamps (max)
• Write current: 10 milliamps (max)
• Data retention: 10 years (minimum)

Pin Configuration

The AT28HC256-70PC has a total of 28 pins, each serving a specific function. The pin configuration is as follows:

1. A16
2. A15
3. A12
4. A7
5. A6
6. A5
7. A4
8. A3
9. A2
10. A1
11. A0
12. VCC
13. OE#
14. CE#
15. WE#
16. I/O0
17. I/O1
18. I/O2
19. I/O3
20. I/O4
21. I/O5
22. I/O6
23. I/O7
24. NC
25. GND
26. A8
27. A9
28. A11

Functional Features

• Byte-wise programmable: The AT28HC256-70PC allows individual bytes to be programmed or erased, providing flexibility in data manipulation.
• Hardware and software write protection: This chip offers multiple levels of write protection to prevent accidental modification or erasure of stored data.
• High endurance: The EEPROM technology used in this product ensures a high number of erase/write cycles, making it suitable for applications that require frequent data updates.
• Automatic page write: The AT28HC256-70PC supports automatic page write operations, enabling efficient programming of multiple bytes at once.

Advantages and Disadvantages

Advantages

• Fast access times enable quick data retrieval.
• Low power consumption prolongs battery life in portable devices.
• Large storage capacity accommodates ample data.
• Reliable data retention ensures data integrity.
• Extended temperature range allows for versatile application usage.

Disadvantages

• Limited write endurance compared to other non-volatile memory technologies.
• Higher cost per bit compared to some alternative memory solutions.

Working Principles

The AT28HC256-70PC utilizes EEPROM technology, which stores data by trapping electric charges within a floating gate transistor. When a byte needs to be programmed, a high voltage is applied to the control gate, allowing electrons to tunnel through a thin oxide layer and become trapped in the floating gate. To erase a byte, a higher voltage is applied, removing the trapped charges.

Application Field Plans

The AT28HC256-70PC finds applications in various fields, including: 1. Microcontroller-based systems 2. Embedded systems 3. Communication devices 4. Automotive electronics 5. Industrial control systems

Alternative Models

Several alternative models with similar specifications and features are available as alternatives to the AT28HC256-70PC. Some notable options include: - AT28C256-15PU - AT28BV256-20TU - AT28HC256E-90PI

These alternatives can be considered based on specific application requirements and availability.

In conclusion, the AT28HC256-70PC is a high-speed, low-power EEPROM chip that offers reliable data storage for various electronic devices. Its characteristics, functional features, and wide range of applications make it a versatile choice for designers and engineers in need of non-volatile memory solutions.