AT27C256R-55RC

Product Overview

Category

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

Use

This product is primarily used for storing data that needs to be permanently written and cannot be modified or erased. It is commonly employed in applications where non-volatile memory is required.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• High storage capacity: The AT27C256R-55RC has a storage capacity of 256 kilobits (32 kilobytes).
• Fast access time: It offers a fast access time of 55 nanoseconds, enabling quick retrieval of data.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-55RC is available in a standard dual in-line package (DIP), which consists of 28 pins arranged in two parallel rows.

Essence

The essence of this product lies in its ability to provide reliable and non-volatile storage for critical data in various electronic systems.

Packaging/Quantity

The AT27C256R-55RC is typically packaged in anti-static tubes or trays. The quantity per package varies depending on the manufacturer but is usually around 25 units.

Specifications

• Storage Capacity: 256 kilobits (32 kilobytes)
• Access Time: 55 nanoseconds
• Operating Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Data Retention: More than 20 years

Pin Configuration

The AT27C256R-55RC 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. A15 - Address Input
17. /OE - Output Enable
18. /CE - Chip Enable
19. /WE - Write Enable
20. Vcc - Power Supply
21. D0 - Data Input/Output
22. D1 - Data Input/Output
23. D2 - Data Input/Output
24. D3 - Data Input/Output
25. D4 - Data Input/Output
26. D5 - Data Input/Output
27. D6 - Data Input/Output
28. D7 - Data Input/Output

Functional Features

• Non-volatile storage: The AT27C256R-55RC retains data even when power is removed.
• Fast access time: With an access time of 55 nanoseconds, data retrieval is quick.
• Easy integration: The chip can be easily integrated into various electronic systems due to its standard pin configuration.
• Low power consumption: The AT27C256R-55RC operates on low power, making it suitable for energy-efficient devices.

Advantages and Disadvantages

Advantages

• Reliable non-volatile storage
• Fast access time
• Easy integration into electronic systems
• Low power consumption

Disadvantages

• Data cannot be modified or erased once programmed
• Limited storage capacity compared to other memory technologies

Working Principles

The AT27C256R-55RC is based on the principle of electrically programmable read-only memory (EPROM). It utilizes a floating-gate transistor structure to store data. During programming, electrical charges are trapped in the floating gate, altering the transistor's behavior and storing the desired data. Once programmed, the data remains intact until the chip is replaced.

Detailed Application Field Plans

The AT27C256R-55RC finds applications in various fields, including:

1. Embedded Systems: Used for firmware storage in microcontrollers and other embedded devices.
2. Automotive Electronics: Employed for storing critical data in automotive systems such as engine control units (ECUs) and infotainment systems.
3. Industrial Control Systems: Utilized for non-volatile storage of configuration data in industrial automation and control systems.
4. Medical Devices: Used for storing firmware and patient data in medical equipment like ultrasound machines and patient monitors.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-55RC but with a slower access time of 150 nanoseconds.
2. AM29