AT27C256R-70PI

Product Overview

Category

AT27C256R-70PI 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-70PI has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed of 70 nanoseconds, it provides quick retrieval of stored information.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-70PI comes in a 28-pin dual in-line package (DIP), which is a widely used packaging format for integrated circuits.

Essence

The essence of this product lies in its ability to store data permanently, making it ideal for applications requiring non-volatile memory.

Packaging/Quantity

The AT27C256R-70PI is typically packaged in tubes or trays, with each tube or tray containing a specific quantity of chips. The exact quantity may vary depending on the manufacturer's specifications.

Specifications

• Capacity: 256 kilobits (32 kilobytes)
• Access Time: 70 nanoseconds
• Supply Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Package Type: 28-pin DIP

Detailed Pin Configuration

1. A14
2. A12
3. A7
4. A6
5. A5
6. A4
7. A3
8. A2
9. A1
10. A0
11. /OE (Output Enable)
12. /WE (Write Enable)
13. /CE (Chip Enable)
14. VSS (Ground)
15. D7
16. D6
17. D5
18. D4
19. D3
20. D2
21. D1
22. D0
23. NC (No Connection)
24. VCC (Supply Voltage)
25. A8
26. A9
27. A11
28. A13

Functional Features

• Non-volatile storage: The AT27C256R-70PI retains data even when power is disconnected.
• High-speed access: With an access time of 70 nanoseconds, it allows for quick retrieval of stored information.
• Easy integration: The chip can be easily integrated into existing electronic systems due to its standard pin configuration and package.

Advantages and Disadvantages

Advantages

• Permanent data storage: The non-volatile nature of this chip ensures that data remains intact even in the absence of power.
• Fast access time: The 70 nanosecond access time enables rapid retrieval of stored information.
• Low power consumption: The AT27C256R-70PI operates on low power, making it suitable for energy-efficient applications.

Disadvantages

• Limited write capability: Unlike some other memory technologies, this chip does not support rewriting or erasing of stored data.
• Relatively small capacity: With a capacity of 256 kilobits, it may not be sufficient for applications requiring larger amounts of storage.

Working Principles

The AT27C256R-70PI utilizes a technology known as electrically programmable read-only memory (EPROM). It stores data by using electrical charges to trap electrons in specific memory cells. These trapped charges represent the binary values of the stored data. The data can be read by applying appropriate voltage levels to the chip's pins.

Detailed Application Field Plans

The AT27C256R-70PI finds applications in various fields, including:

1. Embedded Systems: It is commonly used in embedded systems for storing firmware, boot code, and configuration data.
2. Automotive Electronics: The chip is utilized in automotive electronics for storing critical information such as calibration data, vehicle parameters, and diagnostic codes.
3. Industrial Control Systems: It is employed in industrial control systems for storing program instructions and configuration settings.
4. Consumer Electronics: The AT27C256R-70PI is found in consumer electronic devices like gaming consoles, set-top boxes, and home appliances for storing system software and user data.

Detailed and Complete Alternative Models

1. AT28C256-15PU: This is a similar 256-kilobit PROM chip with an access time of 150 nanoseconds.
2. AM27C256-120DC: Another alternative, this chip offers a capacity of 256 kilobits and operates at an access time of 120 nanoseconds.
3. M27C256