AT27C256R-45RC

Product Overview

Category

AT27C256R-45RC belongs to the category of programmable read-only memory (PROM) chips.

Use

This product is primarily used for storing data that needs to be permanently written and cannot be modified or erased. It is commonly employed in applications where non-volatile memory is required.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• High storage capacity: The AT27C256R-45RC has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed of 45 nanoseconds, it provides quick retrieval of data.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-45RC is available in a standard 28-pin dual in-line package (DIP).

Essence

The essence of this product lies in its ability to store data permanently, ensuring reliable and secure information retention.

Packaging/Quantity

The AT27C256R-45RC is typically packaged in reels or tubes, with each containing a specific quantity of chips. The exact quantity may vary depending on the manufacturer's specifications.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 45 nanoseconds
• Supply Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Data Retention: More than 20 years

Detailed Pin Configuration

The AT27C256R-45RC features a 28-pin configuration. The pinout diagram is as follows:

```

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| | | 1 28 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |_______________| ```

Functional Features

• Write Protection: The AT27C256R-45RC supports write protection, preventing accidental modification of stored data.
• High-Speed Operation: With a fast access time of 45 nanoseconds, it enables quick retrieval of information.
• Low Power Consumption: The chip operates on low power, making it suitable for battery-powered devices.
• Easy Integration: The AT27C256R-45RC can be easily integrated into existing electronic systems due to its standard pin configuration.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention even during power loss.
• High storage capacity allows for storing a significant amount of data.
• Fast access time enables quick retrieval of information.
• Low power consumption makes it suitable for portable devices.

Disadvantages

• Inability to modify or erase stored data limits its flexibility compared to other types of memory.
• Limited storage capacity when compared to modern memory technologies.

Working Principles

The AT27C256R-45RC is based on the principle of electrically programmable read-only memory (EPROM). It utilizes a floating-gate transistor structure that allows data to be permanently written during the manufacturing process. Once programmed, the data remains unchanged until the end of its lifespan.

Detailed Application Field Plans

The AT27C256R-45RC finds applications in various fields, including:

1. Embedded Systems: Used for firmware storage in microcontrollers and other embedded devices.
2. Automotive Electronics: Employed for storing critical data in automotive systems, such as engine control units (ECUs) and airbag modules.
3. Industrial Control Systems: Utilized for storing configuration data and firmware in industrial automation equipment.
4. Consumer Electronics: Found in devices like gaming consoles, set-top boxes, and digital cameras for storing system software and firmware.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to the AT27C256R-45RC, this model offers a capacity of 256 kilobits with a slower access time of 150 nanoseconds.
2. AM29F040B-90JC: A flash memory alternative with a larger capacity of 4 megabits (512 kilobytes) and a faster access time of 90 nanoseconds.
3. M27C256B-12F1: Another EPROM chip with a capacity of 256 kilobits and an access time of 120 nanoseconds.

These alternative models provide options with varying specifications to suit different application requirements.

In conclusion, the AT27C256R-45RC is a programmable read-only memory