AT27C256R-15PC

Product Overview

Category

AT27C256R-15PC 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 is commonly employed in applications where non-volatile memory is required.

Characteristics

• Non-volatile: The stored data remains intact even when power is removed.
• High storage capacity: The AT27C256R-15PC has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a maximum access time of 150 nanoseconds, it provides quick retrieval of data.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-15PC comes in a 28-pin plastic dual in-line package (PDIP).

Essence

The essence of this PROM chip lies in its ability to store data permanently, ensuring that critical information remains intact even during power outages or system failures.

Packaging/Quantity

The AT27C256R-15PC is typically packaged in tubes or trays, with each tube or tray 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: Maximum 150 nanoseconds
• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Input/Output Compatibility: TTL, CMOS

Detailed Pin Configuration

The AT27C256R-15PC has a total of 28 pins, which are assigned specific functions as follows:

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. VPP: Programming Voltage
14. NC: No Connection
15. D0: Data Input/Output
16. D1: Data Input/Output
17. D2: Data Input/Output
18. D3: Data Input/Output
19. D4: Data Input/Output
20. D5: Data Input/Output
21. D6: Data Input/Output
22. D7: Data Input/Output
23. VCC: Power Supply
24. GND: Ground
25. A8: Address Input
26. A9: Address Input
27. A11: Address Input
28. A13: Address Input

Functional Features

• Permanent data storage: The AT27C256R-15PC allows for the permanent storage of data, ensuring its integrity even in the absence of power.
• High-speed access: With a maximum access time of 150 nanoseconds, the chip enables fast retrieval of stored information.
• Low power consumption: The chip operates on low power, making it suitable for energy-efficient applications.
• Compatibility: The AT27C256R-15PC is compatible with both TTL and CMOS input/output systems.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention even during power outages.
• High storage capacity allows for the storage of large amounts of data.
• Fast access time enables quick retrieval of information.
• Low power consumption makes it suitable for battery-powered devices.

Disadvantages

• Data cannot be modified or erased once programmed.
• Limited storage capacity compared to other memory technologies.
• Relatively higher cost per bit compared to other memory options.

Working Principles

The AT27C256R-15PC utilizes a technology known as electrically programmable read-only memory (EPROM). It consists of a grid of memory cells, each capable of storing a single bit of information. The data is programmed into the memory cells during the manufacturing process and remains permanently stored until the chip is replaced.

To read the stored data, the appropriate address is provided to the chip, and the output enable (/OE) signal is activated. This allows the data to be accessed from the selected memory location.

Detailed Application Field Plans

The AT27C256R-15PC finds applications in various fields where non-volatile memory is required. Some of the common application areas include:

1. Embedded Systems: The chip can be used in embedded systems to store critical firmware or configuration data that needs to be retained even when power is lost.
2. Automotive Electronics: It can be