DS1371U+

Real Time Clock Overview

The DS1371U+ is a real-time clock (RTC) featuring a 32-bit binary counter for continuous timekeeping and a secondary 24-bit counter. It operates on an I²C bidirectional bus with a supply voltage range of 1.7V to 5.5V. The device includes a watchdog timer or alarm function, configurable interrupt/square-wave output, and general-purpose RAM when the secondary counter is disabled. It utilizes an internal oscillator circuit requiring only an external 32.768kHz crystal. Operating temperatures range from -40°C to +85°C in an 8-pin μSOP package.

Real Time Clock Feature Summary

• 32-bit binary counter for elapsed seconds counting
• Configurable 24-bit counter serving as watchdog timer, periodic alarm, or 3-byte RAM
• I²C serial interface supporting standard (100kHz) and fast mode (400kHz)
• Low power consumption: 800nA timekeeping current at 3.3V

Real Time Clock Applications

• Servers
• Point-of-Sale Equipment
• Portable Instruments
• Elapsed Time Measurements

Real Time Clock Procurement Notes

Verify component authenticity through authorized distributors. Confirm RoHS compliance status via official documentation. Ensure proper handling for ESD-sensitive devices during installation. Check datasheet revisions for any updates to electrical characteristics or pin configurations before finalizing designs.

Real Time Clock Selection Notes

Select this component for applications requiring precise elapsed time measurement rather than calendar dates. Ensure the system design accommodates the 32.768kHz crystal requirement. Verify that the I²C bus speed matches the master controller capabilities. Consider the open-drain SQW/INT pin requirements for pull-up resistor selection.

Real Time Clock Part Context

The DS1371U+ belongs to the Maxim Integrated RTC family. The 'U' suffix indicates the 8-pin μSOP package. The '+' suffix denotes a lead-free and RoHS-compliant manufacturing process. This part is designed for low-power, high-accuracy timekeeping in embedded systems.

Real Time Clock Replacement Considerations

Direct replacements include other Maxim Integrated RTCs with similar I²C interfaces and package types. Verify pin compatibility and register map alignment when substituting. Check if the alternative supports the required 32-bit counter functionality and operating temperature range.