AT27C256R-45PC

Product Overview

Category

AT27C256R-45PC belongs to the category of programmable read-only memory (PROM) chips.

Use

This chip is commonly used for storing data that needs to be permanently written and cannot be modified or erased. It is widely utilized in various electronic devices, such as computers, microcontrollers, and consumer electronics.

Characteristics

• Non-volatile: The data stored in AT27C256R-45PC remains intact even when power is turned off.
• High storage capacity: This chip has a capacity of 256 kilobits, allowing it to store a significant amount of data.
• Fast access time: With a speed of 45 nanoseconds, it provides quick access to stored information.
• Durable: The AT27C256R-45PC is designed to withstand harsh environmental conditions and has a long lifespan.

Package

The AT27C256R-45PC chip is available in a 28-pin plastic dual in-line package (PDIP). This package ensures easy installation and compatibility with standard socket connectors.

Essence

The essence of AT27C256R-45PC lies in its ability to provide non-volatile storage for critical data, ensuring reliable operation of electronic devices.

Packaging/Quantity

AT27C256R-45PC is typically packaged in tubes or trays, with each containing a specific quantity of chips. The exact quantity may vary depending on the manufacturer's specifications.

Specifications

• Memory Capacity: 256 kilobits
• Access Time: 45 nanoseconds
• Supply Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Package Type: 28-pin PDIP

Detailed Pin Configuration

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

Functional Features

• Non-volatile storage: The AT27C256R-45PC retains data even when power is disconnected.
• High-speed access: With an access time of 45 nanoseconds, it provides quick retrieval of stored information.
• Easy integration: The chip can be easily integrated into various electronic devices due to its standard package and pin configuration.
• Reliable performance: Designed to withstand harsh environmental conditions, ensuring long-term reliability.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data integrity.
• High storage capacity for a wide range of applications.
• Fast access time allows for efficient data retrieval.
• Durable design ensures longevity.

Disadvantages

• Data cannot be modified or erased once programmed.
• Limited storage capacity compared to other memory technologies.
• Requires external programming equipment for initial data programming.

Working Principles

AT27C256R-45PC utilizes a technology known as electrically programmable read-only memory (EPROM). The chip is initially programmed with data using specialized programming equipment. Once programmed, the data remains stored in the chip even when power is removed. During operation, the chip allows read access to the stored data while preventing any modifications or erasures.

Detailed Application Field Plans

The AT27C256R-45PC chip finds applications in various fields, including:

1. Computer systems: Used for storing firmware, BIOS, and other critical system data.
2. Microcontrollers: Provides non-volatile storage for program code and configuration settings.
3. Consumer electronics: Used in devices such as gaming consoles, set-top boxes, and digital cameras for storing firmware and calibration data.
4. Automotive industry: Utilized in electronic control units (ECUs) for storing critical data related to engine management, safety systems, and diagnostics.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-45PC, this chip offers a capacity of 256 kilobits with