DS1374U-33 – DALLAS

The DS1374U-33 is a low-current real-time clock (RTC) with a reset function, manufactured by Dallas Semiconductor (now Maxim Integrated). It integrates a 32.768kHz crystal oscillator, RTC core, and a precision voltage monitor/reset circuit. The -33 suffix indicates a VCC reset threshold voltage of 3.3V. When VCC falls below this threshold, the RST output is asserted low, providing a reliable reset signal to a microprocessor or microcontroller. The RTC portion tracks seconds, minutes, hours, day, date, month, and year information, with automatic leap-year compensation valid up to 2100. Data is accessed serially via a simple 2-wire interface. As indicated by the “2005 NON RoHS” designation, this specific revision was manufactured prior to RoHS compliance mandates and may contain lead. Engineers should verify component compliance with current environmental regulations before incorporating this part into new designs.