AT27C256R-70PA

Product Overview

Category

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

Use

This chip is commonly used for storing permanent data that cannot be modified or erased. It is widely utilized in various electronic devices and systems.

Characteristics

• Non-volatile: The stored data remains intact even when power is turned off.
• High storage capacity: The AT27C256R-70PA has a capacity of 256 kilobits, allowing it to store a large amount of information.
• Fast access time: With a speed of 70 nanoseconds, this chip enables quick retrieval of data.
• Low power consumption: The AT27C256R-70PA operates efficiently, consuming minimal power during operation.

Package

The AT27C256R-70PA is available in a standard dual in-line package (DIP), which consists of 28 pins arranged in two parallel rows.

Essence

This PROM chip serves as a reliable and non-volatile memory solution for storing critical data in electronic systems.

Packaging/Quantity

The AT27C256R-70PA is typically packaged in anti-static tubes or trays, with each tube containing multiple chips. The exact quantity may vary depending on the supplier.

Specifications

• Capacity: 256 kilobits
• Access Time: 70 nanoseconds
• Supply Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Data Retention: 10 years

Pin Configuration

The AT27C256R-70PA features 28 pins, each serving a specific function:

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. /WE: Write Enable
19. D0: Data Input/Output
20. D1: Data Input/Output
21. D2: Data Input/Output
22. D3: Data Input/Output
23. D4: Data Input/Output
24. D5: Data Input/Output
25. D6: Data Input/Output
26. D7: Data Input/Output
27. Vcc: Power Supply
28. GND: Ground

Functional Features

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

Advantages and Disadvantages

Advantages

• Reliable and durable non-volatile memory solution.
• Large storage capacity for storing significant amounts of data.
• Fast access time ensures quick retrieval of information.
• Low power consumption prolongs battery life in portable devices.

Disadvantages

• Inability to modify or erase stored data, limiting flexibility.
• Limited write endurance compared to other memory technologies.
• Higher cost compared to volatile memory options.

Working Principles

The AT27C256R-70PA operates based on the principle of electrical charge trapping. The data is stored in a grid of memory cells, with each cell representing a bit of information. When a specific address is accessed, the corresponding memory cell's charge state determines the output data.

Detailed Application Field Plans

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

1. Embedded Systems: Used for firmware storage in microcontrollers and other embedded devices.
2. Automotive Electronics: Employed in automotive systems for storing critical data such as calibration parameters and configuration settings.
3. Industrial Control Systems: Utilized in industrial control units for storing program code and system configurations.
4. Consumer Electronics: Found in devices like gaming consoles, set-top boxes, and digital cameras for storing firmware and user data.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-70PA but operates at a slower speed of 150 nanoseconds.
2. AM27C256-120DC: An alternative