AT27C256R-45RI

Product Overview

Category

AT27C256R-45RI 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 the manufacturing process and then read it back later.

Characteristics

• Non-volatile: The stored data remains intact even without power.
• High storage capacity: The AT27C256R-45RI has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed rating of 45 nanoseconds, it provides quick data retrieval.
• Reliable: The chip is designed to withstand harsh environmental conditions and has a long lifespan.

Package

The AT27C256R-45RI comes in a standard dual in-line package (DIP), which consists of two parallel rows of pins.

Essence

The essence of this product lies in its ability to store data permanently, making it ideal for applications where non-volatile memory is required.

Packaging/Quantity

The AT27C256R-45RI is typically packaged in tubes or trays, with each tube or tray containing a specific quantity of chips. The exact quantity may vary depending on the manufacturer's specifications.

Specifications

• Capacity: 256 kilobits (32 kilobytes)
• Access Time: 45 nanoseconds
• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Input/Output Compatibility: TTL, CMOS

Detailed Pin Configuration

The AT27C256R-45RI has a total of 28 pins, which are assigned specific functions as follows:

1. A0-A14: Address Inputs
2. CE: Chip Enable
3. OE: Output Enable
4. WE: Write Enable
5. VCC: Power Supply
6. GND: Ground 7-14: Data Outputs (Q0-Q7) 15-28: No Connection (NC)

Functional Features

• Easy data storage: The chip allows for simple and efficient data storage during the manufacturing process.
• High-speed data retrieval: With a fast access time of 45 nanoseconds, it enables quick retrieval of stored data.
• Non-volatile memory: The AT27C256R-45RI retains data even when power is turned off, ensuring data integrity.

Advantages and Disadvantages

Advantages

• Permanent data storage: The non-volatile nature of this chip ensures that data remains intact even in the absence of power.
• Fast access time: The 45 nanosecond access time allows for quick retrieval of stored data.
• Reliable: The AT27C256R-45RI is designed to withstand harsh environmental conditions, making it highly reliable.

Disadvantages

• Limited write capability: Unlike some other memory technologies, PROM chips like the AT27C256R-45RI can only be written once during the manufacturing process.
• Lack of flexibility: Once data is written onto the chip, it cannot be modified or erased, limiting its use in certain applications.

Working Principles

The AT27C256R-45RI utilizes a technology called floating-gate transistors. During the manufacturing process, data is programmed onto the chip by applying high voltages to specific memory cells. These voltages cause electrons to become trapped in the floating gate, altering the transistor's behavior and storing the desired data. When the chip is later accessed, the stored data is read by detecting the transistor's state.

Detailed Application Field Plans

The AT27C256R-45RI finds applications in various fields, including:

1. Embedded Systems: It can be used to store firmware or configuration data in microcontrollers and other embedded devices.
2. Automotive Electronics: The chip is suitable for storing critical data in automotive systems, such as engine control units (ECUs) and infotainment systems.
3. Industrial Control Systems: It can be utilized in industrial automation and control systems to store calibration data or program code.
4. Medical Devices: The AT27C256R-45RI can be employed in medical equipment to store patient data or device settings.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the AT27C256R-45RI include:

1. AT28C256: This chip from the same manufacturer offers the same capacity but with a faster access time of 35 nanoseconds.
2. AM27C256: A compatible PROM chip from a different manufacturer, offering the same capacity and access time.

These alternative models can be considered based on specific requirements and availability.

Word count: 570 words