AT27C256R-55JI

Product Overview

Category

AT27C256R-55JI 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 allows users to write data onto the chip during the manufacturing process, but once programmed, the data cannot be changed or erased.

Characteristics

• Non-volatile: The stored data remains intact even without power.
• High storage capacity: The AT27C256R-55JI has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: This chip provides quick access to the stored data.
• Durable: The AT27C256R-55JI is designed to withstand harsh environmental conditions.

Package

The AT27C256R-55JI comes in a 28-pin plastic dual in-line package (PDIP).

Essence

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

Packaging/Quantity

The AT27C256R-55JI 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 packaging standards.

Specifications

• Operating voltage: 5V
• Access time: 55 nanoseconds
• Organization: 32K x 8 bits
• Temperature range: -40°C to +85°C
• Endurance: 10,000 write cycles

Detailed Pin Configuration

The AT27C256R-55JI has a total of 28 pins, each serving a specific purpose. Here is the 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. VPP (Programming Voltage)
14. DQ0
15. DQ1
16. DQ2
17. DQ3
18. DQ4
19. DQ5
20. DQ6
21. DQ7
22. VCC (Power Supply)
23. /WE (Write Enable)
24. NC (No Connection)
25. GND (Ground)
26. A8
27. A9
28. A11

Functional Features

• Non-volatile storage: The AT27C256R-55JI retains data even when power is turned off.
• High-speed access: This chip provides fast access to the stored data.
• Easy integration: The 28-pin package allows for easy integration into various electronic systems.
• Durable design: The AT27C256R-55JI is designed to withstand harsh environmental conditions.

Advantages and Disadvantages

Advantages

• Permanent data storage
• Fast access time
• High endurance
• Easy integration into electronic systems

Disadvantages

• Data cannot be changed or erased once programmed
• Limited storage capacity compared to other memory technologies

Working Principles

The AT27C256R-55JI uses a technology called floating-gate MOSFET to store data. During programming, a high voltage is applied to the control gate, allowing electrons to tunnel through the insulating layer onto the floating gate. This process traps the charge, representing the programmed data. When reading, the presence or absence of charge on the floating gate determines the output state.

Detailed Application Field Plans

The AT27C256R-55JI finds applications in various fields, including: 1. Embedded systems 2. Automotive electronics 3. Industrial control systems 4. Medical devices 5. Consumer electronics

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to the AT27C256R-55JI, but with a slower access time of 150 nanoseconds.
2. AT29C256-90JC: Offers faster access time of 90 nanoseconds compared to the AT27C256R-55JI.
3. AM27C256-200DC: Provides a larger temperature range (-55°C to +125°C) for extreme environments.

These alternative models offer similar functionality to the AT27C256R-55JI but may have variations in specifications and features.

In conclusion, the AT27C256R-55JI is a programmable read-only memory chip that provides non-volatile storage of data. With its high capacity, fast access time, and durability, it finds applications in various industries. While it has limitations such as the inability to change or erase programmed data, alternative models with different specifications