25LC640/W

Product Overview

Category: Integrated Circuits (ICs)

Use: Non-volatile Serial EEPROM Memory

Characteristics: - Low-power CMOS technology - 64Kbits of memory - SPI interface - 8-byte page write mode - Self-timed erase and write cycles - 1,000,000 erase/write cycles endurance - Data retention > 200 years - 2.5V to 5.5V operating voltage range - Industrial temperature range (-40°C to +85°C) - Lead-free package options available

Package: 8-pin SOIC (Small Outline Integrated Circuit)

Essence: The 25LC640/W is a non-volatile serial EEPROM memory chip that provides reliable data storage in various electronic devices.

Packaging/Quantity: The 25LC640/W is typically sold in reels or tubes containing multiple units. The exact quantity depends on the supplier and customer requirements.

Specifications

• Memory Size: 64 Kbits (8 Kilobytes)
• Interface: Serial Peripheral Interface (SPI)
• Operating Voltage Range: 2.5V to 5.5V
• Maximum Clock Frequency: 10 MHz
• Write Endurance: 1,000,000 cycles
• Data Retention: > 200 years
• Package Type: 8-pin SOIC

Detailed Pin Configuration

The 25LC640/W has the following pin configuration:

| Pin Number | Pin Name | Function | |------------|----------|----------| | 1 | CS | Chip Select (active low) | | 2 | SCK | Serial Clock | | 3 | SI | Serial Data Input | | 4 | SO | Serial Data Output | | 5 | WP | Write Protect (active low) | | 6 | VSS | Ground | | 7 | HOLD | Hold Input (optional) | | 8 | VCC | Power Supply Voltage |

Functional Features

• Non-volatile memory: The 25LC640/W retains data even when power is disconnected.
• Serial interface: It uses the SPI protocol for communication with a microcontroller or other devices.
• Self-timed erase and write cycles: The chip manages the timing of erase and write operations, simplifying the integration process.
• Page write mode: Allows writing up to 8 bytes at once, improving efficiency.
• Wide operating voltage range: Can be powered by a variety of sources, making it suitable for different applications.
• Industrial temperature range: Designed to operate reliably in harsh environments.

Advantages and Disadvantages

Advantages: - Low-power consumption - High endurance and data retention - Compact package size - Easy integration with microcontrollers - Suitable for industrial applications

Disadvantages: - Limited storage capacity compared to larger EEPROMs - Requires an external microcontroller or device for communication

Working Principles

The 25LC640/W utilizes electrically erasable programmable read-only memory (EEPROM) technology. It stores data using floating-gate transistors that can be electrically programmed and erased. The serial interface allows for easy integration with microcontrollers, which can read from and write to the memory using the SPI protocol.

Detailed Application Field Plans

The 25LC640/W is commonly used in various electronic devices and systems, including but not limited to: - Consumer electronics (e.g., TVs, set-top boxes, audio players) - Automotive electronics (e.g., infotainment systems, instrument clusters) - Industrial control systems - Medical devices - Communication equipment

Detailed and Complete Alternative Models

• 25LC256: 256 Kbit serial EEPROM
• 25LC1024: 1 Mbit serial EEPROM
• 25AA640A: 64 Kbit serial EEPROM with I2C interface
• 24LC64: 64 Kbit serial EEPROM with two-wire interface

These alternative models offer different memory sizes and communication interfaces, providing flexibility for various application requirements.

Word count: 446 words