AT27C256R-12RC

Product Overview

Category

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

Use

The AT27C256R-12RC 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 consumer electronics.

Characteristics

• Non-volatile: The data stored in the AT27C256R-12RC chip remains intact even when power is turned off.
• High storage capacity: The chip has a storage capacity of 256 kilobits, allowing it to store a large 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-12RC chip operates on low power, making it suitable for battery-powered devices.
• Reliable performance: The chip offers high reliability and endurance, ensuring data integrity over extended periods.

Package and Quantity

The AT27C256R-12RC chip is available in a standard dual in-line package (DIP) with 28 pins. It is typically sold in reels or tubes, with quantities varying based on customer requirements.

Specifications

• Manufacturer: Atmel Corporation
• Part Number: AT27C256R-12RC
• Memory Type: Programmable Read-Only Memory (PROM)
• Storage Capacity: 256 kilobits (32 kilobytes)
• Access Time: 120 nanoseconds
• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Package Type: Dual In-Line Package (DIP)
• Pin Count: 28

Detailed Pin Configuration

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

1. A0: Address Input
2. A1: Address Input
3. A2: Address Input
4. A3: Address Input
5. A4: Address Input
6. A5: Address Input
7. A6: Address Input
8. A7: Address Input
9. A8: Address Input
10. A9: Address Input
11. A10: Address Input
12. A11: Address Input
13. A12: Address Input
14. A13: Address Input
15. A14: Address Input
16. /OE: Output Enable
17. /CE: Chip Enable
18. /WE: Write Enable
19. VSS: Ground
20. DQ0: Data Output
21. DQ1: Data Output
22. DQ2: Data Output
23. DQ3: Data Output
24. DQ4: Data Output
25. DQ5: Data Output
26. DQ6: Data Output
27. DQ7: Data Output
28. VCC: Supply Voltage

Functional Features

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

• Read operation: The chip allows for the retrieval of stored data through the address inputs and data outputs.
• Write protection: The chip includes write protection mechanisms to prevent accidental modification of stored data.
• High-speed access: With a fast access time of 120 nanoseconds, the chip enables quick retrieval of data.
• Low power consumption: The chip operates on low power, making it suitable for energy-efficient applications.
• Reliable performance: The AT27C256R-12RC chip provides high reliability and endurance, ensuring data integrity over extended periods.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention even without power.
• High storage capacity allows for storing a large amount of data.
• Fast access time enables quick retrieval of stored information.
• Low power consumption makes it suitable for battery-powered devices.
• Reliable performance ensures data integrity over extended periods.

Disadvantages

• The data stored in the AT27C256R-12RC chip cannot be modified or updated once programmed.
• Limited write cycles: The chip has a finite number of times it can be written to before it becomes unreliable.

Working Principles

The AT27C256R-12RC chip operates based on the principles of programmable read-only memory. It uses a grid of transistors and diodes to store data in a non-volatile manner. During programming, electrical charges are applied to specific memory cells, altering their state to represent binary data. Once programmed, the data remains intact until the chip is erased or reprogrammed.

Detailed Application Field Plans

The AT27C256R-12RC chip finds applications in