Maxim Integrated DS1390U-33 Low-Voltage SPI/3-Wire RTC

The Maxim Integrated DS1390U-33 is a highly integrated, low-voltage real-time clock (RTC) that provides a full binary-coded decimal (BCD) clock and calendar with 64 bytes of NV SRAM. This precision timekeeping device is designed to maintain accurate time and date information, ranging from seconds to years, with leap-year compensation up to the year 2100. It is ideally suited for applications in consumer electronics, embedded systems, and network infrastructure that require reliable timekeeping under low-power conditions.

This RTC operates over a wide voltage range of 2.97V to 5.5V, making it versatile for various power supply scenarios. The DS1390U-33 is available in a compact, 10-pin µSOP package, which is perfect for space-constrained applications. Its SPI/3-wire interface ensures easy integration with microcontrollers and other digital systems, providing a flexible and straightforward communication protocol for clock and calendar data retrieval.

Key features of the DS1390U-33 include:

• Accurate RTC with BCD format.
• 64 bytes of NV SRAM for data storage.
• Automatic leap year compensation.
• Low power consumption, ideal for battery-backed applications.
• Wide operating voltage range (2.97V to 5.5V).
• Compact 10-pin µSOP packaging.
• Simple SPI/3-wire serial interface for easy integration.
• Trickle-charge capability to maintain timekeeping with battery backup.

With its built-in power-fail detect and switch circuitry, the DS1390U-33 ensures that timekeeping continues seamlessly in the event of a power failure, by automatically switching to a backup battery source. Additionally, the device features a trickle-charge capability that allows for the recharging of the backup battery during normal operation, further enhancing its reliability in maintaining accurate timekeeping.

The DS1390U-33 is an excellent choice for designers looking for a low-voltage, highly accurate, and reliable RTC solution. Its integration capabilities, coupled with low power consumption and a full set of timekeeping features, make it a go-to component for a wide range of applications where maintaining precise time is crucial.