AT27C256R-45TU

Product Overview

Category

AT27C256R-45TU 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 later.

Characteristics

• Non-volatile: The stored data remains intact even without power supply.
• High storage capacity: The AT27C256R-45TU has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed rating of 45 nanoseconds, it provides quick data retrieval.
• Reliable: This PROM chip offers high endurance and long-term data retention.

Package

The AT27C256R-45TU is available in a standard 28-pin plastic dual in-line package (PDIP).

Essence

The essence of this product lies in its ability to store data permanently and provide fast access to the stored information.

Packaging/Quantity

The AT27C256R-45TU 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 manufacturer.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 45 nanoseconds
• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Pin Count: 28
• Package Type: PDIP

Detailed Pin Configuration

1. A14 - Address Input
2. A12 - Address Input
3. A7 - Address Input
4. A6 - Address Input
5. A5 - Address Input
6. A4 - Address Input
7. A3 - Address Input
8. A2 - Address Input
9. A1 - Address Input
10. A0 - Address Input
11. /OE - Output Enable
12. /CE - Chip Enable
13. NC - No Connection
14. D7 - Data Input/Output
15. D6 - Data Input/Output
16. D5 - Data Input/Output
17. D4 - Data Input/Output
18. D3 - Data Input/Output
19. D2 - Data Input/Output
20. D1 - Data Input/Output
21. D0 - Data Input/Output
22. VCC - Power Supply
23. GND - Ground
24. /WE - Write Enable
25. /PGM - Program
26. /BYTE - Byte Mode Select
27. NC - No Connection
28. A8 - Address Input

Functional Features

• Non-volatile memory: The AT27C256R-45TU retains data even when power is disconnected.
• High-speed access: With an access time of 45 nanoseconds, it provides quick retrieval of stored information.
• Easy integration: The chip can be easily integrated into various electronic systems due to its standard pin configuration and package.

Advantages and Disadvantages

Advantages

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

Disadvantages

• Limited storage capacity compared to other memory technologies
• Inability to modify or erase stored data once programmed

Working Principles

The AT27C256R-45TU operates based on the principle of electrical charge trapping in a floating gate structure. During programming, a high voltage is applied to the control gate, allowing electrons to tunnel through a thin oxide layer onto the floating gate. This process traps the charge, altering the threshold voltage and storing the desired data. During read operations, the stored charge is detected, allowing the retrieval of the programmed information.

Detailed Application Field Plans

The AT27C256R-45TU 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 such as calibration parameters and configuration settings. 3. Industrial control systems: Utilized for storing program code and configuration data in industrial automation equipment. 4. Consumer electronics: Found in devices like gaming consoles, set-top boxes, and digital cameras for storing firmware and data.

Detailed and Complete Alternative Models

Some alternative models to the AT27C256R-45TU include: - AT28C256-15PU: Similar capacity and characteristics, but with a different package type (PDIP). - AM27C256-150DC: Comparable specifications and pin configuration, but with a ceramic dual in-line package (CDIP).

These alternative models can be considered based on specific requirements and compatibility with the target system.

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