25LC640-I/P

Product Overview

Category: Integrated Circuits (ICs)

Use: Non-volatile Serial EEPROM Memory

Characteristics: - Low-power CMOS technology - 64K-bit (8K x 8) Electrically Erasable Programmable Read Only Memory (EEPROM) - SPI compatible serial interface - 2.5V to 5.5V operating voltage range - 1 MHz clock rate - 32-byte page write buffer - Self-timed erase and write cycles - 100-year data retention - Industrial temperature range (-40°C to +85°C) - Lead-free package

Package: DIP (Dual In-line Package)

Essence: The 25LC640-I/P is a non-volatile memory chip that provides storage for digital data in various electronic devices.

Packaging/Quantity: The 25LC640-I/P is available in a tube packaging with a quantity of 45 units per tube.

Specifications

• Memory Size: 64K-bit (8K x 8)
• Interface Type: Serial Peripheral Interface (SPI)
• Supply Voltage Range: 2.5V to 5.5V
• Clock Rate: 1 MHz
• Write Protection: Software and Hardware
• Data Retention: 100 years
• Operating Temperature Range: -40°C to +85°C
• Package Type: DIP
• Package Dimensions: 300 mil (7.62mm) width, 600 mil (15.24mm) length, 300 mil (7.62mm) height

Pin Configuration

The 25LC640-I/P has a total of 8 pins arranged as follows:

┌───┬───┐ │ 1 │ 8 │ ├───┼───┤ │ 2 │ 7 │ ├───┼───┤ │ 3 │ 6 │ ├───┼───┤ │ 4 │ 5 │ └───┴───┘

1. Chip Select (CS) - Input: Used to enable or disable the device.
2. Serial Clock (SCK) - Input: Provides the clock signal for data transfer.
3. Serial Data Input/Output (SDI/SDO) - Bi-directional: Transfers data between the device and the microcontroller.
4. Ground (GND) - Power Supply Ground.
5. Write Protect (WP) - Input: Enables or disables write protection.
6. Hold (HOLD) - Input: Suspends serial communication temporarily.
7. VCC - Power Supply Voltage.
8. Not Connected (NC) - No connection required.

Functional Features

• Non-volatile memory: The 25LC640-I/P retains data even when power is removed.
• Serial interface: It uses the SPI protocol for easy integration with microcontrollers.
• Low-power consumption: Ideal for battery-powered devices.
• Self-timed erase and write cycles: Simplifies programming operations.
• Write protection: Can be enabled to prevent accidental modification of stored data.
• Industrial temperature range: Suitable for harsh operating environments.

Advantages and Disadvantages

Advantages: - High data retention period of 100 years. - Wide operating voltage range allows compatibility with various systems. - Compact DIP package for easy integration into existing designs. - Low-power consumption extends battery life. - Self-timed erase and write cycles simplify programming.

Disadvantages: - Limited storage capacity compared to larger EEPROMs. - Slower clock rate compared to some other memory chips. - Limited package options may not suit all applications.

Working Principles

The 25LC640-I/P is based on Electrically Erasable Programmable Read Only Memory (EEPROM) technology. It stores digital data using a grid of memory cells that can be electrically programmed and erased. The chip communicates with a microcontroller through the Serial Peripheral Interface (SPI), allowing for easy integration into various systems. Data can be written, read, and erased using specific commands sent over the SPI bus.

Detailed Application Field Plans

The 25LC640-I/P is widely used in various electronic devices and systems, including but not limited to: 1. Consumer electronics: TVs, set-top boxes, remote controls. 2. Automotive: Engine control units, infotainment systems. 3. Industrial automation: PLCs, motor control systems. 4. Medical devices: Patient monitoring systems, diagnostic equipment. 5. Internet of Things (IoT): Smart home devices, sensor networks.

Detailed and Complete Alternative Models

1. 25AA640A-I/ST: Similar specifications, smaller package (8-pin SOIC).
2. 25LC640