AT27C256R-55JC

Product Overview

Category

AT27C256R-55JC belongs to the category of programmable read-only memory (PROM) chips.

Use

This chip is commonly used for storing data that needs to be permanently written and cannot be modified or erased. It is widely utilized in various electronic devices such as computers, microcontrollers, and consumer electronics.

Characteristics

• Non-volatile: The stored data remains intact even when power is turned off.
• High storage capacity: The AT27C256R-55JC has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: It operates at a speed of 55 nanoseconds, allowing for quick retrieval of data.
• Low power consumption: The chip is designed to consume minimal power during operation.

Package

The AT27C256R-55JC is available in a 28-pin plastic dual in-line package (PDIP). This package provides mechanical protection and facilitates easy integration into circuit boards.

Essence

The essence of the AT27C256R-55JC lies in its ability to store large amounts of data reliably and securely, making it an essential component in many electronic systems.

Packaging/Quantity

These chips are typically sold in reels or tubes, with each reel or tube containing a specific quantity of AT27C256R-55JC chips. The exact quantity may vary depending on the manufacturer and supplier.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 55 nanoseconds
• Supply Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Package Type: 28-pin PDIP

Detailed Pin Configuration

The AT27C256R-55JC chip has a total of 28 pins, each serving a specific purpose. 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

The AT27C256R-55JC offers the following functional features:

• Read-only memory: It allows for the retrieval of stored data but does not support writing or erasing operations.
• High-speed access: With an access time of 55 nanoseconds, it enables quick data retrieval.
• Low power consumption: The chip operates efficiently with minimal power requirements.
• Reliable data storage: The non-volatile nature of the chip ensures that data remains intact even during power loss.

Advantages and Disadvantages

Advantages

• Large storage capacity
• Fast access time
• Low power consumption
• Reliable data retention

Disadvantages

• Inability to modify or erase stored data
• Limited functionality compared to read-write memory

Working Principles

The AT27C256R-55JC operates based on the principle of electrical charge trapping. The data is stored in a matrix of memory cells, with each cell representing a bit of information. When a specific address is accessed, the corresponding memory cell releases its stored charge, which is then interpreted as data.

Detailed Application Field Plans

The AT27C256R-55JC finds applications in various fields, including:

1. Embedded Systems: It is used in microcontrollers and embedded systems for storing firmware and program code.
2. Computer Systems: The chip is utilized in computer systems for storing BIOS (Basic Input/Output System) and other critical system data.
3. Consumer Electronics: It is employed in devices such as gaming consoles, set-top boxes, and digital cameras for storing firmware and configuration data.

Detailed and Complete Alternative Models

Some alternative models to the AT27C256R-55JC include:

1. AT28C256-15PU: Similar capacity and characteristics, but operates at a slower speed (150