AT27C256R-45RU

Product Overview

Category

AT27C256R-45RU 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 retained even when power is turned off. It allows users to program and store data, which can then be accessed by a microcontroller or other electronic devices.

Characteristics

• Non-volatile: The stored data remains intact even without power.
• High storage capacity: The AT27C256R-45RU has a capacity of 256 kilobits (32 kilobytes).
• Fast access time: With a speed of 45 nanoseconds, it provides quick data retrieval.
• Low power consumption: The chip operates on low power, making it suitable for battery-powered devices.

Package

The AT27C256R-45RU is available in a 28-pin plastic dual in-line package (PDIP).

Essence

The essence of this PROM chip lies in its ability to store and retain data reliably, making it an essential component in various electronic systems.

Packaging/Quantity

The AT27C256R-45RU is typically sold in reels or tubes, with each containing a specific quantity of chips. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• Access Time: 45 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-45RU features a total of 28 pins, each serving a specific purpose. Here is a detailed pin configuration:

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. NC: No Connection
14. D7: Data Input/Output
15. D6: Data Input/Output
16. D5: Data Input/Output
17. D4: Data Input/Output
18. D3: Data Input/Output
19. D2: Data Input/Output
20. D1: Data Input/Output
21. D0: Data Input/Output
22. VCC: Power Supply
23. GND: Ground
24. /WE: Write Enable
25. /PGM: Program Enable
26. /BYTE: Byte Mode Select
27. A8: Address Input
28. A9: Address Input

Functional Features

• Easy Programming: The AT27C256R-45RU can be programmed using standard PROM programming equipment.
• High Reliability: The stored data is resistant to accidental erasure or modification, ensuring reliable operation.
• Low Power Consumption: The chip operates on low power, making it suitable for battery-powered devices.
• Wide Operating Temperature Range: It can function reliably in a wide range of temperatures, from -40°C to +85°C.

Advantages and Disadvantages

Advantages

• Non-volatile memory ensures data retention even without power.
• High storage capacity allows for storing a significant amount of data.
• Fast access time enables quick retrieval of information.
• Easy programming process using standard PROM programming equipment.

Disadvantages

• Once programmed, the data cannot be modified or erased, limiting flexibility.
• Limited storage capacity compared to other memory technologies like flash memory.

Working Principles

The AT27C256R-45RU operates based on the principle of electrical charge trapping. During programming, a high voltage is applied to the selected address pins, causing electrons to be trapped in the floating gate of the memory cell. These trapped charges represent the stored data. When reading, the chip applies appropriate voltages to the address and control pins, allowing the microcontroller to access the stored data.

Detailed Application Field Plans

The AT27C256R-45RU finds applications in various fields, including:

1. Embedded Systems: Used for storing firmware, configuration data, and lookup tables in microcontrollers and embedded systems.
2. Automotive Electronics: Employed in automotive electronic control units (ECUs) for storing calibration data, fault codes, and program code.
3. Industrial Automation: Utilized in programmable logic controllers (PLCs) for storing ladder logic programs and system parameters.
4. Consumer Electronics: Integrated into devices such as gaming consoles, set-top boxes