DS1338U-18+ Real-Time Clock from Maxim Integrated

The DS1338U-18+ is a highly integrated real-time clock (RTC) module from Maxim Integrated that offers a full binary-coded decimal (BCD) clock/calendar with 56 bytes of NV SRAM. This precision timekeeping device is designed to provide a robust timekeeping solution for a wide range of applications, including embedded systems, industrial controls, and consumer electronics.

The DS1338U-18+ operates at a voltage range of 2.0V to 5.5V, making it suitable for both standard and low-power operations. The device features a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining accurate timekeeping even when the main power is lost. This functionality is critical for applications that require time-sensitive operations and data logging.

With an I2C serial interface, the DS1338U-18+ allows for easy integration into existing systems with minimal interfacing required. The I2C interface supports a 400kHz data transfer rate, enabling fast communication with microcontrollers and other digital systems.

The RTC module also includes an oscillator stop flag that indicates if the clock oscillator has stopped, which can be essential for fault detection and system diagnostics. Additionally, the device offers a programmable square-wave output that can be used for various purposes, such as a system wake-up signal or as an external interrupt.

The DS1338U-18+ comes in a compact 8-pin µSOP package, which is ideal for space-constrained applications. Its small footprint, combined with its low power consumption and high accuracy, makes it an excellent choice for portable devices and battery-operated systems.

Key features of the DS1338U-18+ include:

• Real-time clock/calendar functionality
• 56 bytes of NV SRAM for data storage
• Automatic power-fail detect and switch circuitry
• I2C serial interface for easy integration
• Programmable square-wave output
• Oscillator stop flag for system reliability checks
• Wide operating voltage range of 2.0V to 5.5V
• Compact 8-pin µSOP packaging

The DS1338U-18+ from Maxim Integrated is a versatile and reliable RTC solution that offers the features and performance necessary for maintaining accurate time in your electronic projects and commercial products.