AT27C256R-90TC

Product Overview

Category

AT27C256R-90TC belongs to the category of programmable read-only memory (PROM) chips.

Use

This product is primarily used for storing non-volatile data that needs to be retained even when power is turned off. It is commonly employed in various electronic devices, such as microcontrollers, computers, and consumer electronics.

Characteristics

• Non-volatile: The stored data remains intact even without power supply.
• Programmable: The memory can be written to once using a programming device.
• Read-only: Once programmed, the data cannot be modified or erased.
• High capacity: The AT27C256R-90TC has a storage capacity of 256 kilobits (32 kilobytes).

Package

The AT27C256R-90TC comes in a Thin Small Outline Package (TSOP) with 32 pins. This package offers a compact form factor and allows for easy integration into electronic circuits.

Essence

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

Packaging/Quantity

The AT27C256R-90TC is typically packaged in reels or tubes, with each reel or tube containing a specific quantity of chips. The exact packaging and quantity may vary depending on the manufacturer and supplier.

Specifications

• Operating Voltage: 4.5V to 5.5V
• Access Time: 90 nanoseconds
• Standby Current: 100 microamps maximum
• Operating Temperature Range: -40°C to +85°C
• Data Retention: 20 years minimum

Pin Configuration

The AT27C256R-90TC chip has a total of 32 pins. The pin configuration is as follows:

1. A0
2. A1
3. A2
4. A3
5. A4
6. A5
7. A6
8. A7
9. A8
10. A9
11. A10
12. A11
13. A12
14. A13
15. A14
16. A15
17. CE (Chip Enable)
18. OE (Output Enable)
19. WE (Write Enable)
20. VCC (Power Supply)
21. NC (No Connection)
22. D0
23. D1
24. D2
25. D3
26. D4
27. D5
28. D6
29. D7
30. GND (Ground)
31. NC (No Connection)
32. NC (No Connection)

Functional Features

• High-speed access: The AT27C256R-90TC offers fast access times, allowing for efficient retrieval of stored data.
• Low power consumption: The chip operates at low power levels, minimizing energy usage and extending battery life in portable devices.
• Reliable data retention: The non-volatile nature of the memory ensures long-term data storage without the need for constant power supply.
• Easy integration: The TSOP package and standard pin configuration facilitate seamless integration into various electronic circuits.

Advantages and Disadvantages

Advantages

• Non-volatile storage ensures data retention even during power interruptions.
• High capacity allows for storing a significant amount of data.
• Fast access times enable quick retrieval of information.
• Low power consumption extends battery life in portable devices.

Disadvantages

• Once programmed, the data cannot be modified or erased, limiting flexibility.
• Limited write cycles compared to other types of memory.
• Relatively higher cost compared to some alternative memory technologies.

Working Principles

The AT27C256R-90TC operates based on the principle of electrical charge trapping. During programming, a high voltage is applied to the memory cells, causing electrons to be trapped in specific locations within the memory array. These trapped charges represent the stored data. When reading the memory, the presence or absence of trapped charges is detected, allowing the retrieval of the stored information.

Detailed Application Field Plans

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

1. Embedded Systems: Used for firmware storage in microcontrollers and embedded systems.
2. Computer Systems: Employed in BIOS (Basic Input/Output System) chips for booting and system initialization.
3. Consumer Electronics: Utilized in devices such as gaming consoles, set-top boxes, and digital cameras for storing firmware and configuration data.
4. Automotive Electronics: Integrated into automotive control units for storing calibration data and firmware.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-90TC but with a slower access time of 150 nanoseconds.
2. AM29F040B-90JC: Flash memory alternative with higher