DS1374C-18#

Real Time Clock Overview

The DS1374C-18# is a real-time clock (RTC) IC featuring a 32-bit binary counter for continuous timekeeping and an integrated 32.768kHz crystal. It operates at a supply voltage of 1.8V with a range of 1.71V to 1.89V, consuming up to 100µA in standby mode. The device includes a secondary 24-bit counter configurable as an alarm or watchdog timer, or as 3 bytes of non-volatile RAM. Communication is handled via an I²C serial interface. Key features include automatic power-fail detection, trickle-charging capability for backup supplies, and separate interrupt and square-wave outputs.

Real Time Clock Feature Summary

• Integrated 32.768kHz crystal within the package
• Automatic power-fail detect and switch circuitry
• Trickle-charge capability for rechargeable backup cells
• Single-pin pushbutton reset input and open-drain reset output

Real Time Clock Applications

• Portable Instruments
• Point-of-Sale Equipment
• Medical Equipment
• Telecommunications

Real Time Clock Procurement Notes

Verify that the specific ordering suffix matches the required voltage and package configuration. Confirm RoHS compliance status based on the '#' designation. Ensure the primary supply voltage remains within the 1.71V to 1.89V range for proper operation. Check for availability of compatible backup power sources such as lithium cells or super capacitors.

Real Time Clock Selection Notes

Select this variant specifically for low-voltage applications requiring a nominal 1.8V supply. The integrated crystal simplifies PCB layout by eliminating external oscillator components. Consider the 16-pin SO package dimensions if space constraints are critical. Evaluate the need for the watchdog or alarm functions against the available non-volatile RAM capacity.

Real Time Clock Part Context

This component belongs to the DS1374 family of I²C real-time clocks. The 'C' suffix indicates the inclusion of an integrated crystal, while the '-18' specifies the 1.8V operating voltage variant. It is manufactured by Analog Devices Inc./Maxim Integrated and is designed for precise timekeeping in battery-backed systems.

Real Time Clock Replacement Considerations

DS1374U-18+ is a parameter-equivalent alternative in a 10-pin µSOP package without an integrated crystal.