AT27C256R-70PU

Product Overview

Category

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

Use

This product is commonly used for storing permanent data that needs to be retained even when power is turned off. It finds applications in various electronic devices such as computers, microcontrollers, and consumer electronics.

Characteristics

• Non-volatile: The stored data remains intact even without power.
• High storage capacity: The AT27C256R-70PU has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed of 70 nanoseconds, it provides quick retrieval of data.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-70PU comes in a plastic DIP (Dual In-line Package) with 28 pins. This package type ensures easy integration into circuit boards and provides mechanical protection.

Essence

The essence of this product lies in its ability to store data permanently and provide fast access to the stored information.

Packaging/Quantity

The AT27C256R-70PU is typically packaged in tubes or trays, containing multiple units per package. The exact quantity may vary depending on the supplier.

Specifications

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

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 (Power Supply)
23. GND (Ground)
24. /WE (Write Enable)
25. /PGM (Program)
26. /BYTE (Byte/Word Organization)
27. /VPP (Programming Voltage)
28. NC (No Connection)

Functional Features

• Easy integration: The AT27C256R-70PU can be easily connected to microcontrollers and other electronic devices.
• High-speed access: With a fast access time of 70 nanoseconds, it ensures quick retrieval of data.
• Reliable storage: The non-volatile nature of PROM ensures that the stored data remains intact even during power loss.
• Low power consumption: The chip operates on low power, making it suitable for energy-efficient applications.

Advantages and Disadvantages

Advantages

• Permanent data storage
• Fast access time
• Easy integration into circuit boards
• Low power consumption

Disadvantages

• Limited storage capacity compared to other memory types
• Inability to modify or erase stored data once programmed

Working Principles

The AT27C256R-70PU is based on the principle of electrical programming. It uses a series of transistors to store data in a matrix of memory cells. Once programmed, the stored data remains unchanged until the next programming cycle. The chip can be accessed by providing the appropriate address and control signals.

Detailed Application Field Plans

The AT27C256R-70PU finds applications in various fields, including:

1. Computer systems: Used for storing BIOS (Basic Input/Output System) and firmware.
2. Microcontrollers: Provides non-volatile memory for program storage.
3. Consumer electronics: Used in devices such as gaming consoles, set-top boxes, and digital cameras for data storage.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-70PU but with a slower access time of 150 nanoseconds.
2. AT29C256-12PC: Flash memory alternative with faster erase and write times.
3. AM27C256-120DC: UV-erasable PROM with a higher capacity of 256 kilobits.

These alternative models offer similar functionality and can be considered based on specific requirements and compatibility with the target system.

In conclusion, the AT27C256R-70PU is a programmable read-only memory chip that provides permanent data storage with fast access times. Its characteristics, pin configuration, functional features, advantages, and disadvantages make it suitable for various applications in computer systems, microcontrollers, and consumer electronics. Additionally, alternative models are available to cater to different needs