AT27C256R-12JC

Product Overview

Category

AT27C256R-12JC 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 written and cannot be modified or erased. It finds applications in various electronic devices where non-volatile memory is required.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• High storage capacity: The AT27C256R-12JC has a capacity of 256 kilobits, allowing it to store a large amount of data.
• Fast access time: With an access time of 120 nanoseconds, it provides quick retrieval of stored information.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.
• Durable: It can withstand multiple read operations without any degradation in performance.

Package

The AT27C256R-12JC is available in a 32-pin PLCC (Plastic Leaded Chip Carrier) package.

Essence

The essence of this PROM chip lies in its ability to store data permanently, providing reliable and secure storage for critical information.

Packaging/Quantity

The AT27C256R-12JC is typically packaged in reels or tubes, with each containing a specific quantity of chips. The exact quantity may vary depending on the manufacturer and customer requirements.

Specifications

• Memory Capacity: 256 kilobits
• Access Time: 120 nanoseconds
• Operating Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Package Type: 32-pin PLCC

Detailed Pin Configuration

The AT27C256R-12JC 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. NC (No Connection)
21. D0
22. D1
23. D2
24. D3
25. D4
26. D5
27. D6
28. D7
29. VCC (Power Supply)
30. GND (Ground)
31. NC (No Connection)
32. NC (No Connection)

Functional Features

• Chip Enable (CE): Activates the chip for read or write operations.
• Output Enable (OE): Enables the output buffers to drive data onto the output pins.
• Write Enable (WE): Controls the write operation of the chip.
• Data Input/Output (D0-D7): Bidirectional pins for data transfer.
• Address Inputs (A0-A15): Selects the memory location for read or write operations.
• Power Supply (VCC) and Ground (GND): Provide the necessary power and ground connections.

Advantages and Disadvantages

Advantages

• Non-volatile storage ensures data integrity even during power loss.
• High storage capacity allows for storing a large amount of information.
• Fast access time enables quick retrieval of data.
• Low power consumption makes it suitable for battery-powered devices.
• Durable design withstands multiple read operations without degradation.

Disadvantages

• Inability to modify or erase stored data limits its flexibility compared to other memory types.
• Limited write endurance, as excessive write operations can degrade the chip's performance over time.

Working Principles

The AT27C256R-12JC operates on the principle of electrical charge trapping. During the programming process, a charge is trapped in specific memory cells to represent the desired data. This trapped charge remains intact even when power is removed, allowing for non-volatile storage.

Detailed Application Field Plans

The AT27C256R-12JC finds applications in various fields, including:

1. Embedded Systems: Used for firmware storage in microcontrollers and other embedded devices.
2. Automotive Electronics: Stores critical data such as calibration parameters and configuration settings.
3. Industrial Control Systems: Provides non-volatile memory for storing program code and configuration data.
4. Medical Devices: Used for storing patient data, device settings, and firmware updates.
5. Consumer Electronics: Found in devices like gaming consoles, set-top boxes, and digital cameras for firmware storage.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-12JC with a capacity of 256 kilobits and an access time of 150 nanoseconds. 2