AT27C256R-12PC

Product Overview

Category

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

Use

The AT27C256R-12PC chip is primarily used for storing data that needs to be permanently stored and cannot be modified. It is commonly used in various electronic devices such as computers, microcontrollers, and embedded systems.

Characteristics

• Non-volatile: The data stored in the AT27C256R-12PC chip remains intact even when power is turned off.
• High storage capacity: The chip has a storage capacity of 256 kilobits (32 kilobytes), allowing it to store a significant amount of data.
• Fast access time: With an access time of 120 nanoseconds, the chip provides quick retrieval of stored data.
• Low power consumption: The AT27C256R-12PC chip operates on low power, making it suitable for battery-powered devices.
• Durable: The chip is designed to withstand harsh environmental conditions and has a long lifespan.

Package and Quantity

The AT27C256R-12PC chip is available in a 28-pin plastic dual in-line package (PDIP). It is typically sold in quantities of one or more, depending on the requirements of the user.

Specifications

• Manufacturer: Atmel Corporation
• Part Number: AT27C256R-12PC
• Memory Type: Programmable Read-Only Memory (PROM)
• Capacity: 256 kilobits (32 kilobytes)
• Access Time: 120 nanoseconds
• Supply Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Package Type: 28-pin Plastic Dual In-Line Package (PDIP)

Pin Configuration

The AT27C256R-12PC chip has a total of 28 pins, each serving a specific function. The pin configuration is as follows:

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. VPP (Programming Voltage)
14. NC (No Connection)
15. Q7
16. Q6
17. Q5
18. Q4
19. Q3
20. Q2
21. Q1
22. Q0
23. VCC (Supply Voltage)
24. GND (Ground)
25. A8
26. A9
27. A11
28. A13

Functional Features

The AT27C256R-12PC chip offers the following functional features:

• Read-only memory: The chip allows for the storage of data that can only be read and not modified.
• High-speed access: With a fast access time of 120 nanoseconds, the chip enables quick retrieval of stored data.
• Easy integration: The chip can be easily integrated into various electronic devices due to its standard pin configuration and package.

Advantages and Disadvantages

Advantages

• Non-volatile storage: The data remains intact even when power is turned off.
• High storage capacity: The chip can store a significant amount of data.
• Fast access time: Quick retrieval of stored data.
• Low power consumption: Suitable for battery-powered devices.
• Durable: Designed to withstand harsh environmental conditions.

Disadvantages

• Data cannot be modified: Once programmed, the data stored in the chip cannot be changed or updated.
• Limited storage capacity: Compared to other memory technologies, the AT27C256R-12PC chip has a relatively lower storage capacity.

Working Principles

The AT27C256R-12PC chip operates based on the principle of electrical programming. During programming, a high voltage is applied to the VPP pin, enabling the data to be stored in the memory cells. Once programmed, the data can only be read and cannot be modified or erased.

Application Field Plans

The AT27C256R-12PC chip finds applications in various fields, including:

1. Computer systems: Used for storing firmware, boot code, and other critical data.
2. Microcontrollers: Utilized for storing program instructions and configuration settings.
3. Embedded systems: Integrated into devices such as industrial control systems, automotive electronics, and consumer electronics for permanent data storage.

Alternative Models

There are several alternative models available that offer similar functionality to the AT27C256R-12PC chip. Some of the notable alternatives include:

1. AT28C256-15PU
2. SST27SF256-70-3C-PGE
3. M27C256B-10F1