AT27C256R-45JI

Product Overview

Category

AT27C256R-45JI belongs to the category of programmable read-only memory (PROM) chips.

Use

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

Characteristics

• Non-volatile: The stored data remains intact even without power supply.
• High storage capacity: The AT27C256R-45JI has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed rating of 45 nanoseconds, it provides quick data retrieval.
• Low power consumption: It operates efficiently with low power requirements.

Package

The AT27C256R-45JI is available in a 28-pin plastic dual in-line package (PDIP). This package offers easy integration into circuit boards and ensures reliable connections.

Essence

The essence of AT27C256R-45JI lies in its ability to provide non-volatile storage for critical data, making it an essential component in many electronic systems.

Packaging/Quantity

This product is typically packaged in reels or tubes, containing a specific quantity of chips per package. The exact packaging and quantity may vary depending on the manufacturer and supplier.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 45 nanoseconds
• Supply Voltage: 5 volts
• Operating Temperature Range: -40°C to +85°C
• Pin Count: 28

Detailed Pin Configuration

1. A14
2. A12
3. A7
4. A6
5. A5
6. A4
7. A3
8. A2
9. A1
10. A0
11. /OE (Output Enable)
12. /WE (Write Enable)
13. NC (No Connection)
14. VCC (Supply Voltage)
15. Q7
16. Q6
17. Q5
18. Q4
19. Q3
20. Q2
21. Q1
22. Q0
23. /CE (Chip Enable)
24. A8
25. A9
26. A11
27. A10
28. GND (Ground)

Functional Features

• Chip Enable (/CE): Activates the chip for data retrieval or programming.
• Output Enable (/OE): Enables the output buffers to provide access to stored data.
• Write Enable (/WE): Allows data to be written into the memory cells.
• Address Inputs (A0-A14): Selects the specific memory location to read from or write to.
• Data Outputs (Q0-Q7): Provide the stored data to the external circuitry.

Advantages and Disadvantages

Advantages

• Non-volatile storage ensures data retention even during power loss.
• High storage capacity allows for storing a significant amount of data.
• Fast access time enables quick retrieval of information.
• Low power consumption contributes to energy efficiency.

Disadvantages

• Limited rewrite capability: The AT27C256R-45JI is a one-time programmable device and cannot be easily reprogrammed.
• Relatively larger physical size compared to newer memory technologies.
• Higher cost per bit compared to other memory options.

Working Principles

The AT27C256R-45JI utilizes a floating-gate transistor technology to store data. When programmed, charges are trapped in the floating gate, altering the transistor's behavior and representing the stored data. During operation, the appropriate address is selected, and the stored data is accessed through the output buffers.

Detailed Application Field Plans

The AT27C256R-45JI finds applications in various fields, including: 1. Computer systems: Used for storing BIOS (Basic Input/Output System) firmware. 2. Microcontrollers: Provides non-volatile memory for program storage. 3. Consumer electronics: Utilized in devices such as gaming consoles and set-top boxes for data storage.

Detailed and Complete Alternative Models

1. AT28C256-15PU: Similar to AT27C256R-45JI but with a slower access time of 150 nanoseconds.
2. AM29F040B-90JC: Flash memory alternative with a larger capacity of 4 megabits (512 kilobytes).
3. M27C256B-12F1: EPROM (Erasable Programmable Read-Only Memory) alternative with an erase capability.

These alternative models offer different specifications and features, allowing users to choose the most suitable option based on their specific requirements.

Word count: 570 words