AT27C256R-90TI

Product Overview

Category

AT27C256R-90TI 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 retained, even when power is turned off. It allows users to write data onto the chip during manufacturing and then read it back later.

Characteristics

• Non-volatile: The stored data remains intact even without power.
• High storage capacity: The AT27C256R-90TI has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: The chip operates at a speed of 90 nanoseconds.
• Low power consumption: It requires minimal power to operate efficiently.

Package

The AT27C256R-90TI is available in a standard 28-pin dual in-line package (DIP).

Essence

The essence of this product lies in its ability to provide non-volatile storage for critical data, ensuring its retention even in the absence of power supply.

Packaging/Quantity

The AT27C256R-90TI 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 supplier.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 90 nanoseconds
• Supply Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Package Type: 28-pin DIP

Detailed Pin Configuration

The AT27C256R-90TI features a 28-pin configuration with the following pin assignments:

1. A16
2. VCC
3. A12
4. A7
5. A6
6. A5
7. A4
8. A3
9. A2
10. A1
11. A0
12. /OE
13. CE
14. WE
15. I/O0
16. I/O1
17. I/O2
18. I/O3
19. I/O4
20. I/O5
21. I/O6
22. I/O7
23. NC
24. GND
25. A15
26. A14
27. A13
28. /BYTE

Functional Features

• Easy data storage: The AT27C256R-90TI allows for simple and efficient data storage during the manufacturing process.
• High-speed access: With an access time of 90 nanoseconds, this chip enables fast retrieval of stored data.
• Non-volatile memory: The non-volatile nature of this PROM chip ensures that data remains intact even when power is turned off.

Advantages and Disadvantages

Advantages

• Reliable data retention: The non-volatile memory ensures that data is retained over long periods without the need for power supply.
• Fast access time: The chip's high-speed access allows for quick retrieval of stored data.
• Low power consumption: The AT27C256R-90TI operates efficiently with minimal power requirements.

Disadvantages

• Limited storage capacity: With a capacity of 256 kilobits, this chip may not be suitable for applications requiring larger memory sizes.
• Lack of flexibility: Once programmed, the data on the chip cannot be modified or erased, limiting its versatility.

Working Principles

The AT27C256R-90TI utilizes a technology known as electrically erasable programmable read-only memory (EEPROM). It stores data by programming individual memory cells using electrical signals. Once programmed, the data remains intact until it is overwritten or erased using specialized equipment.

Detailed Application Field Plans

The AT27C256R-90TI finds applications in various fields, including:

1. Embedded Systems: It is commonly used in microcontroller-based systems to store firmware and other critical data.
2. Automotive Electronics: The chip is utilized in automotive applications for storing calibration data, configuration settings, and code storage.
3. Industrial Control Systems: It is employed in industrial control systems to store program instructions and data logs.

Detailed and Complete Alternative Models

1. AT28C256-15PU: This alternative model offers the same capacity and pin configuration but operates at a slower access time of 150 nanoseconds.
2. AT29C256-12PC: Similar to the AT27C256R-90TI, this model has a capacity of 256 kilobits and operates at a faster access time of 120 nanoseconds.

These alternative models provide options with varying access times and may be suitable for different application requirements.

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