AT27C256R-12PI

Product Overview

Category

AT27C256R-12PI belongs to the category of programmable read-only memory (PROM) chips.

Use

This product is commonly used for storing data that needs to be permanently retained, such as firmware or software code.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• Programmable: The memory can be written to once using a special programming process.
• Read-only: Once programmed, the data cannot be modified.

Package

AT27C256R-12PI is available in a 28-pin DIP (Dual In-line Package) format.

Essence

The essence of this product lies in its ability to provide non-volatile storage for critical data in electronic systems.

Packaging/Quantity

AT27C256R-12PI is typically packaged in tubes or trays and is available in various quantities depending on the manufacturer.

Specifications

• Part Number: AT27C256R-12PI
• Memory Size: 256 kilobits (32 kilobytes)
• Access Time: 120 nanoseconds
• Operating Voltage: 5 volts
• Temperature Range: -40°C to +85°C

Pin Configuration

The AT27C256R-12PI chip has a total of 28 pins. Here is the 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. /CE (Chip Enable)
13. NC (No Connection)
14. D7
15. D6
16. D5
17. D4
18. D3
19. D2
20. D1
21. D0
22. VCC (Power Supply)
23. /WE (Write Enable)
24. /PGM (Program)
25. /BYTE (Byte/Word Organization)
26. /ACC (Access Time Control)
27. GND (Ground)
28. A8

Functional Features

• High-speed access: The AT27C256R-12PI offers fast read access time, allowing for efficient data retrieval.
• Low power consumption: This chip is designed to operate with minimal power requirements, making it suitable for battery-powered devices.
• Reliable data retention: The non-volatile nature of the memory ensures that the stored data remains intact over long periods.

Advantages and Disadvantages

Advantages

• Non-volatile storage
• Fast access time
• Low power consumption
• Wide temperature range

Disadvantages

• Data cannot be modified once programmed
• Limited storage capacity compared to other memory types

Working Principles

The AT27C256R-12PI uses a floating-gate transistor technology to store data. During programming, a high voltage is applied to the selected memory cells, causing electrons to tunnel onto the floating gate. This alters the threshold voltage of the transistor, effectively storing the desired data. During normal operation, the stored data is read by applying appropriate voltages to the memory cells.

Detailed Application Field Plans

AT27C256R-12PI finds applications in various fields, including: 1. Embedded systems 2. Automotive electronics 3. Industrial control systems 4. Medical devices 5. Consumer electronics

Alternative Models

Here are some alternative models that offer similar functionality: - AT28C256-15PU - AM27C256-150DC - M27C256B-12F1

These models can be considered as alternatives to AT27C256R-12PI based on their specifications and compatibility.

In conclusion, the AT27C256R-12PI is a programmable read-only memory chip that provides non-volatile storage for critical data. With its fast access time, low power consumption, and reliable data retention, it is widely used in various applications across different industries.