AT27C256R-15PA

Product Overview

Category

AT27C256R-15PA belongs to the category of programmable read-only memory (PROM) chips.

Use

This product is widely used in electronic devices for storing permanent data that cannot be modified or erased. It provides non-volatile memory storage, making it suitable for applications where data integrity is crucial.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• High capacity: The AT27C256R-15PA has a capacity of 256 kilobits, allowing for substantial data storage.
• Fast access time: With a speed rating of 150 nanoseconds, this PROM chip ensures quick retrieval of stored information.
• Low power consumption: The AT27C256R-15PA is designed to operate efficiently with minimal power requirements.

Package and Quantity

The AT27C256R-15PA is available in a standard dual in-line package (DIP) format. Each package contains one PROM chip.

Specifications

• Capacity: 256 kilobits
• Access Time: 150 nanoseconds
• Operating Voltage: 5 volts
• Package Type: DIP

Pin Configuration

The AT27C256R-15PA follows a standard pin configuration for PROM chips:

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. Vcc - Power Supply
19. D0 - Data Output
20. D1 - Data Output
21. D2 - Data Output
22. D3 - Data Output
23. D4 - Data Output
24. D5 - Data Output
25. D6 - Data Output
26. D7 - Data Output
27. NC - No Connection
28. /WE - Write Enable
29. GND - Ground

Functional Features

The AT27C256R-15PA offers the following functional features:

• Read-only memory: It allows for the retrieval of stored data but does not support writing or modifying the contents.
• High-speed access: With a fast access time of 150 nanoseconds, it enables quick data retrieval.
• Reliable storage: The non-volatile nature of this PROM chip ensures that the stored data remains intact even during power loss or device shutdown.

Advantages and Disadvantages

Advantages

• Non-volatile storage ensures data integrity.
• High capacity allows for substantial data storage.
• Fast access time enables quick retrieval of information.
• Low power consumption makes it energy-efficient.

Disadvantages

• Inability to modify or erase stored data limits its flexibility.
• Limited functionality compared to programmable memory chips that support read and write operations.

Working Principles

The AT27C256R-15PA operates based on the principle of electrical charge trapping in a floating-gate structure. During programming, a high voltage is applied to the control gate, which causes electrons to tunnel through a thin oxide layer onto the floating gate. This trapped charge alters the threshold voltage, allowing the device to store binary data. During read operations, the stored charge is detected, enabling the retrieval of the programmed data.

Application Field Plans

The AT27C256R-15PA finds applications in various fields, including:

1. Embedded Systems: It is used for firmware storage in microcontrollers and other embedded devices.
2. Automotive Electronics: PROM chips are employed in automotive systems for storing critical data such as calibration parameters and configuration settings.
3. Industrial Control Systems: These chips are utilized in industrial control systems to store program code and configuration data.

Alternative Models

Several alternative models with similar functionality to the AT27C256R-15PA include:

1. AT28C256-15PU
2. AM27C256-150DC
3. M27C256B-15F1
4. SST27SF256-70-3C-PGE

These models offer comparable specifications and can be considered as alternatives based on specific requirements.

In conclusion, the AT27C256R-15PA is a programmable read-only memory chip that provides non-volatile storage of data. With its high capacity, fast access time, and low power consumption, it is suitable for various applications in embedded systems, automotive electronics, and industrial control systems