AT27C256R-55PC

Product Overview

Category

AT27C256R-55PC belongs to the category of programmable read-only memory (PROM) chips.

Use

This product is commonly used in electronic devices for storing non-volatile data that needs to be permanently stored even when power is turned off.

Characteristics

• Non-volatile: The data stored in AT27C256R-55PC remains intact even without power.
• Programmable: The memory can be programmed with specific data before being installed in a device.
• Read-only: Once programmed, the data cannot be modified or erased.

Package

AT27C256R-55PC is available in a 28-pin plastic dual in-line package (PDIP).

Essence

The essence of AT27C256R-55PC lies in its ability to provide reliable and permanent storage of data in electronic devices.

Packaging/Quantity

This product is typically packaged in tubes or trays, with each containing a specified quantity of AT27C256R-55PC chips.

Specifications

• Operating Voltage: 5V
• Access Time: 55ns
• Memory Size: 256 kilobits (32 kilobytes)
• Organization: 32K x 8 bits
• Programming Method: Parallel
• Erase Method: Not applicable (read-only memory)

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. D0
15. D1
16. D2
17. D3
18. D4
19. D5
20. D6
21. D7
22. VCC (Power Supply)
23. /PGM (Program)
24. /BYTE (Byte/Word Organization)
25. A8
26. A9
27. A11
28. GND (Ground)

Functional Features

• High-speed access: The AT27C256R-55PC offers fast access times, allowing for efficient data retrieval.
• Reliable storage: The non-volatile nature of this memory chip ensures that the stored data remains intact over extended periods.
• Easy integration: The parallel programming method simplifies the integration process into electronic devices.

Advantages and Disadvantages

Advantages

• Permanent storage of data
• Fast access times
• Easy integration into electronic devices

Disadvantages

• Inability to modify or erase programmed data
• Limited memory size compared to other storage options

Working Principles

AT27C256R-55PC operates by storing data in a grid of memory cells. These cells can be programmed with specific data using a parallel programming method. Once programmed, the data can be accessed by enabling the chip and providing the appropriate address.

Detailed Application Field Plans

AT27C256R-55PC finds applications in various electronic devices, including but not limited to: 1. Microcontrollers 2. Embedded systems 3. Industrial control systems 4. Automotive electronics 5. Communication devices

Alternative Models

1. AT28C256-15PU: Similar specifications with a different package type (PDIP).
2. AT27C256R-70PU: Higher access time variant (70ns) with the same package type (PDIP).
3. AT27C512R-45PU: Double the memory size (512 kilobits) with a similar package type (PDIP).

These alternative models provide similar functionality and can be considered as alternatives to AT27C256R-55PC based on specific requirements.

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