DS1392U-18

Real Time Clock Overview

The DS1392U-18 is a low-voltage serial real-time clock (RTC) manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 1.71 V to 1.89 V and functions in temperatures from -40°C to +85°C. The device utilizes a Serial 3-Wire interface for communication and provides binary date formats alongside HH:MM:SS:hh time formats supporting both 12-hour and 24-hour modes. Key features include an integrated alarm, calendar functionality, and a trickle charger. It is housed in a uSOP-10 package with surface-mount installation.

Real Time Clock Feature Summary

• Low-voltage operation between 1.71 V and 1.89 V
• Serial 3-Wire bus interface
• Integrated alarm, calendar, and trickle charger
• Backup switching capability

Real Time Clock Applications

• Portable electronic devices requiring precise timekeeping
• Battery-powered systems utilizing trickle charging
• Industrial equipment operating in extended temperature ranges

Real Time Clock Procurement Notes

The DS1392U-18 is listed as End-of-Life (EOL). Availability is restricted, with some distributors indicating no sales in certain regions. Verification of current stock status and alternative sourcing is required before procurement planning.

Real Time Clock Selection Notes

Select this component for applications necessitating a low-voltage RTC with a 3-wire interface. Ensure the design supports the specific 1.71 V to 1.89 V operating range. Consider the uSOP-10 package constraints and the EOL status when designing new products.

Real Time Clock Part Context

This part belongs to the DS1392U series of real-time clocks. It shares functional similarities with other Maxim Integrated RTCs like the DS1339U but differs in interface type (3-Wire vs. I2C) and package size (uSOP-10 vs. uSOP-8).

Real Time Clock Replacement Considerations

Due to the EOL status, direct substitutes should be evaluated based on pin compatibility and interface requirements. The DS1393U-18+ is a related part in the same family, though interface and feature verification is necessary.