AT27C256R-70RU

Product Overview

Category

AT27C256R-70RU belongs to the category of programmable read-only memory (PROM) chips.

Use

This chip 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-70RU has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed rating of 70 nanoseconds, it provides quick data retrieval.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-70RU comes in a standard 28-pin dual in-line package (DIP), which is widely used in electronic circuits.

Essence

The essence of this PROM chip lies in its ability to store data permanently, ensuring reliable and secure data retention.

Packaging/Quantity

The AT27C256R-70RU is typically packaged in reels or tubes, with each containing a specific quantity of chips. The exact packaging and quantity may vary depending on the manufacturer.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 70 nanoseconds
• Supply Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Pin Count: 28
• Package Type: Dual In-Line Package (DIP)

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. D7
15. D6
16. D5
17. D4
18. D3
19. D2
20. D1
21. D0
22. VCC (Supply Voltage)
23. GND (Ground)
24. /WE (Write Enable)
25. /PGM (Program)
26. /BYTE (Byte Mode Select)
27. NC (No Connection)
28. A8

Functional Features

• Non-volatile storage: The AT27C256R-70RU retains data even when power is disconnected.
• High-speed access: With a fast access time of 70 nanoseconds, data retrieval is efficient.
• Easy integration: The chip can be easily integrated into various electronic systems due to its standard pin configuration and package type.
• Low power consumption: The AT27C256R-70RU operates on low power, making it suitable for battery-powered devices.

Advantages and Disadvantages

Advantages

• Permanent data storage ensures data integrity.
• Fast access time allows for quick retrieval of stored information.
• Easy integration into existing electronic systems.
• Low power consumption extends battery life in portable devices.

Disadvantages

• Data cannot be modified or erased once programmed.
• Limited storage capacity compared to other memory technologies.
• Relatively higher cost per bit compared to other memory types.

Working Principles

The AT27C256R-70RU utilizes a technology called floating-gate MOSFET (metal-oxide-semiconductor field-effect transistor) to store data. When programming the chip, 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-70RU 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 such as calibration values and configuration settings in automotive control units.
3. Industrial Control Systems: Utilized for non-volatile memory storage in programmable logic controllers (PLCs) and industrial automation equipment.
4. Consumer Electronics: Found in devices like gaming consoles, set-top boxes, and digital cameras for storing firmware and configuration data.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to the AT27C256R-70RU, this chip offers a capacity of 256 kilobits with a slower access time of 150 nanoseconds.
2. AM27C256-120DC: Another alternative with the same capacity but a higher access time of 120 nanoseconds.
3. M27C256B-12F1: This chip provides the same capacity and access time as the AT27C256R-70RU but comes in