AT27C256R-12TC

Product Overview

Category

AT27C256R-12TC 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 stored and cannot be modified or erased. It is commonly used in various electronic devices such as computers, microcontrollers, and consumer electronics.

Characteristics

• Non-volatile: The data stored in AT27C256R-12TC remains intact even when power is turned off.
• High storage capacity: This chip has a storage capacity of 256 kilobits (32 kilobytes).
• Fast access time: With an access time of 120 nanoseconds, it allows for quick retrieval of data.
• Low power consumption: AT27C256R-12TC operates on low power, making it suitable for battery-powered devices.

Package

AT27C256R-12TC is available in a Thin Small Outline Package (TSOP). This package provides a compact form factor and facilitates easy integration into electronic circuits.

Essence

The essence of AT27C256R-12TC lies in its ability to store data permanently, ensuring that critical information remains intact even during power outages or system resets.

Packaging/Quantity

AT27C256R-12TC 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

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 120 nanoseconds
• Supply Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Data Retention: More than 20 years

Detailed Pin Configuration

AT27C256R-12TC has a total of 28 pins. The pin configuration is as follows:

1. A0 - Address Input
2. A1 - Address Input
3. A2 - Address Input
4. A3 - Address Input
5. A4 - Address Input
6. A5 - Address Input
7. A6 - Address Input
8. A7 - Address Input
9. A8 - Address Input
10. A9 - Address Input
11. A10 - Address Input
12. A11 - Address Input
13. A12 - Address Input
14. A13 - Address Input
15. A14 - Address Input
16. A15 - Address Input
17. /OE - Output Enable
18. /CE - Chip Enable
19. /WE - Write Enable
20. VSS - Ground
21. DQ0 - Data Output/Input
22. DQ1 - Data Output/Input
23. DQ2 - Data Output/Input
24. DQ3 - Data Output/Input
25. DQ4 - Data Output/Input
26. DQ5 - Data Output/Input
27. DQ6 - Data Output/Input
28. DQ7 - Data Output/Input

Functional Features

• Read Operation: AT27C256R-12TC allows for the retrieval of stored data through its address inputs and data output pins.
• Write Protection: The chip features a write enable pin (/WE) that can be used to protect the stored data from accidental modification.
• High-Speed Access: With an access time of 120 nanoseconds, this chip ensures fast data retrieval.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention even during power loss.
• High storage capacity suitable for various applications.
• Low power consumption makes it ideal for battery-powered devices.
• Fast access time enables quick data retrieval.

Disadvantages

• Data cannot be modified or erased once programmed.
• Limited storage capacity compared to other memory technologies.
• Requires external circuitry for programming and reading data.

Working Principles

AT27C256R-12TC is based on the principle of electrically programmable read-only memory (EPROM). The data is stored in a matrix of memory cells, with each cell representing a bit. Programming is achieved by applying specific voltage levels to the address inputs and data inputs while enabling the write operation. Once programmed, the data remains unchanged until the chip is replaced.

Detailed Application Field Plans

AT27C256R-12TC finds applications in various fields, including:

1. Computer Systems: Used for storing system firmware, BIOS, and configuration data.
2. Microcontrollers: Utilized for storing program code and critical data in embedded systems.
3. Consumer Electronics: Integrated into devices like gaming consoles, set-top boxes, and audio players for storing firmware and user settings.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-12TC, this chip offers