AT27C256R-55RI

Product Overview

Category

AT27C256R-55RI 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 retained, even when power is turned off. It is commonly employed in various electronic devices and systems.

Characteristics

• Non-volatile: The stored data remains intact even without power supply.
• High storage capacity: The AT27C256R-55RI has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: It offers a quick access time of 55 nanoseconds.
• Reliable: This PROM chip ensures data integrity and durability.
• Low power consumption: It operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-55RI comes in a standard dual in-line package (DIP), which consists of 28 pins arranged in two parallel rows.

Essence

The essence of this PROM chip lies in its ability to store and retrieve data reliably, making it an essential component in many electronic systems.

Packaging/Quantity

The AT27C256R-55RI is typically packaged in tubes or trays, with each containing a specific quantity of chips. The exact packaging and quantity may vary depending on the manufacturer and supplier.

Specifications

• Capacity: 256 kilobits (32 kilobytes)
• Access Time: 55 nanoseconds
• Supply Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Data Retention: 20 years

Pin Configuration

The AT27C256R-55RI chip has a total of 28 pins, numbered as follows:

1 A14 28 2 A12 27 3 A7 26 4 A6 25 5 A5 24 6 A4 23 7 A3 22 8 A2 21 9 A1 20 10 A0 19 11 GND 18 12 OE# 17 13 CE# 16 14 WE# 15

Functional Features

• Easy programming: The AT27C256R-55RI can be programmed using standard PROM programming equipment.
• High-speed operation: It offers fast read access time, enabling quick retrieval of stored data.
• Data protection: The chip features a write enable pin (WE#) and an output enable pin (OE#), allowing control over data reading and writing operations.
• Compatibility: The AT27C256R-55RI is compatible with various microcontrollers and other digital devices.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention even during power loss.
• High storage capacity for storing large amounts of data.
• Fast access time allows for quick retrieval of information.
• Low power consumption makes it suitable for battery-powered devices.

Disadvantages

• Once programmed, the data cannot be modified or erased.
• Limited storage capacity compared to other memory technologies.
• Relatively higher cost compared to some alternative memory solutions.

Working Principles

The AT27C256R-55RI operates based on the principle of electrical charge trapping. During programming, the desired data is written into the memory cells by applying appropriate voltage levels. Once programmed, the data remains stored in the memory cells until explicitly erased.

Detailed Application Field Plans

The AT27C256R-55RI 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 in automotive control units. 3. Industrial automation: Used in programmable logic controllers (PLCs) for storing configuration data. 4. Consumer electronics: Found in devices such as gaming consoles, set-top boxes, and audio equipment for data storage.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to the AT27C256R-55RI, but with a slower access time of 150 nanoseconds.
2. AM29F040B-90JC: Flash memory chip with a higher capacity of 4 megabits (512 kilobytes).
3. M27C256B-12F1: Another PROM chip with a capacity of 256 kilobits and a faster access time of 12 nanoseconds.

These alternative models offer different specifications and features, providing options based on specific requirements.

In conclusion, the AT27C256R-55RI is a reliable and widely used PROM chip that offers non-volatile data storage with high capacity and fast access time. Its applications span across various industries,