Encyclopedia Entry: 25AA640AT-I/SN

Product Overview

Category

The 25AA640AT-I/SN belongs to the category of Serial EEPROM (Electrically Erasable Programmable Read-Only Memory) chips.

Use

This product is commonly used for non-volatile storage in various electronic devices, such as microcontrollers, computers, and consumer electronics.

Characteristics

• Non-volatile memory: Retains data even when power is removed.
• Serial interface: Communicates using a serial protocol, typically SPI (Serial Peripheral Interface).
• High storage capacity: The 25AA640AT-I/SN has a capacity of 64 kilobits (8 kilobytes).
• Low power consumption: Operates at low voltage levels and consumes minimal power during read/write operations.

Package and Quantity

The 25AA640AT-I/SN is available in an SOIC (Small Outline Integrated Circuit) package. It is supplied in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Memory Capacity: 64 kilobits (8 kilobytes)
• Interface: SPI (Serial Peripheral Interface)
• Operating Voltage: 1.8V - 5.5V
• Operating Temperature Range: -40°C to +85°C
• Write Endurance: 1 million cycles
• Data Retention: 200 years

Pin Configuration

The 25AA640AT-I/SN has a total of 8 pins, which are assigned specific functions:

1. Chip Select (/CS): Enables communication with the chip when pulled low.
2. Serial Clock (SCK): Provides the clock signal for synchronous communication.
3. Serial Data Input (SI): Transfers data from the microcontroller to the chip.
4. Serial Data Output (SO): Transfers data from the chip to the microcontroller.
5. Write Protect (/WP): When pulled low, prevents write operations on the chip.
6. VCC: Power supply voltage (1.8V - 5.5V).
7. Ground (GND): Common ground reference.
8. Hold (/HOLD): Suspends ongoing operations when pulled low.

Functional Features

• Byte-level Read/Write: Allows individual bytes to be read from or written to the memory.
• Sequential Read: Supports continuous reading of multiple bytes without requiring repeated address input.
• Software Protection: Provides a write protection feature that can be enabled or disabled using specific commands.
• Hardware Protection: The /WP pin can be used to prevent accidental writes by pulling it low.
• Chip Erase: Allows the entire memory to be erased in a single operation.

Advantages and Disadvantages

Advantages

• High storage capacity for non-volatile data storage.
• Low power consumption, suitable for battery-powered devices.
• Compact package size for space-constrained applications.
• Wide operating voltage range allows compatibility with various systems.
• Long data retention period ensures data integrity over extended periods.

Disadvantages

• Limited write endurance compared to other non-volatile memory technologies.
• Requires a microcontroller or other compatible device for communication and control.

Working Principles

The 25AA640AT-I/SN utilizes EEPROM technology to store data. It consists of an array of floating-gate transistors that can be electrically programmed and erased. The serial interface allows the microcontroller to send commands and data to the chip, which then performs the requested operations. The stored data remains intact even when power is removed, making it ideal for applications requiring non-volatile memory.

Application Field Plans

The 25AA640AT-I/SN finds application in various fields, including: - Embedded systems - Automotive electronics - Industrial automation - Smart home devices - Wearable technology

Alternative Models

Other alternative models with similar functionality to the 25AA640AT-I/SN include: - AT25080A - CAT24C08 - M95040 - ST25P64

These alternatives offer comparable specifications and can be used as drop-in replacements in many applications.

In conclusion, the 25AA640AT-I/SN is a versatile Serial EEPROM chip that provides non-volatile storage capabilities for a wide range of electronic devices. Its high capacity, low power consumption, and compact package make it an excellent choice for various applications in different industries.