25LC640A-I/ST

Series:	--
Packaging:	Tube
Part Status:	Active
Memory Type:	Non-Volatile
Memory Format:	EEPROM
Technology:	EEPROM
Memory Size:	64Kb (8K x 8)
Clock Frequency:	10MHz
Write Cycle Time - Word, Page:	5ms
Memory Interface:	SPI
Voltage - Supply:	2.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	8-TSSOP
Base Part Number:	25LC640A

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25LC640A-I/ST: Memory

The 25LC640A-I/ST memory is a serial EEPROM device developed by Microchip Technology Inc. for low voltage applications. It is an 8-pin, low voltage CMOS device that features an 8Kbit memory array accessible using an industry-standard SPI interface. The 25LC640A-I/ST can also be used to store data in a variety of header formats.The 25LC640A-I/ST is ideal for applications that require low power consumption, low standby current and enhanced security. The device is ideal for applications such as configuration and setup memory, microcontrollers and embedded systems, and other applications that require storage of factory settings.

Application field

The 25LC640A-I/ST memory is most commonly used in embedded systems and microcontroller-based applications, but it can also be used in applications that require data transfer or backup as a result of requirements for low power and low standby current. The device is a low voltage device and, as such, provides a great deal of flexibility in system design, including the ability to easily integrate with a variety of voltage and frequency requirements. The 25LC640A-I/ST is also well-suited for applications that require a secure storage medium, as it offers enhanced security features such as write protection, data authentication and data obscurity. The 25LC640A-I/ST is also widely used in the automotive and industrial control sectors and is often used in applications that require high reliability and robust performance.

Working Principles

The 25LC640A-I/ST memory is an 8-pin device, with the first six pins being used for communications and the remaining two for power supplies. The device operates on a single supply voltage of 1.8 to 5.5 volts and is triggered via a SPI serial interface. It is capable of storing up to 8 Kilobytes of data.When initiating a write or a read transaction to the 25LC640A-I/ST, the master device first sends the control byte, which enables writing or reading from the device. The control byte consists of 8 bits; the first bit is the WRITE bit, which is set to one when the master wishes to write data to the device and set to zero when the master wishes to read data from the device. The second bit is the READ bit, which is set to one when the master wishes to read data from the device and set to zero when the master wishes to write data to the device. The remaining 6 bits in the control byte are the address bytes, which determine the location in memory where the data is to be written or read.Once the control byte has been sent, the master device can then send the data to be written to the device, or read the data from the device. When sending data to be written, the master device must send exactly 8 bits, which will be written in sequential locations starting from the address byte specified in the control byte. When reading data from the device, the master device is required to send 8 required clock cycles to ensure that the device properly returns the correct data. Once the data has been written or read from the device, the master device ends the transaction by sending the 9th clock cycle, which is a required “dummy” cycle to ensure that the device correctly ends the transaction.Overall, the 25LC640A-I/ST is a versatile device that provides an ideal solution for a wide range of applications. Its small size, low power consumption and enhanced security features make it ideal for a variety of applications and the ability to easily integrate with a variety of voltage and frequency requirements makes it a great choice for designers seeking a reliable and robust solution.

Conclusion

The 25LC640A-I/ST is an 8-pin, low power, low voltage serial EEPROM device developed by Microchip Technology Inc. for applications that require low power consumption and enhanced security. It is ideal for applications such as configuration and setup memory, microcontrollers and embedded systems, and other applications that require storage of factory settings. Additionally, its small size, low power consumption and enhanced security features make it ideal for a variety of applications.

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