DS1374C-33#

Real Time Clock Overview

The DS1374C-33# is a real-time clock (RTC) IC featuring a 32-bit binary counter and an I²C serial interface. It includes a secondary 24-bit counter for alarms or watchdog functions, plus 3 bytes of non-volatile RAM when disabled. The device integrates a crystal and operates on a primary supply of 2.97V to 5.5V with backup support from 1.3V to 5.5V. Standby current is typically 175µA at 3.3V. It provides automatic power-fail detection, reset output, and trickle charging in a 16-pin SO package.

Real Time Clock Feature Summary

• 32-bit binary time-of-day counter with I²C interface
• Integrated 32.768kHz crystal in 16-SOIC package
• Automatic power-fail detect and switch circuitry
• Trickle-charge capability for backup batteries

Real Time Clock Applications

• Portable instruments
• Point-of-sale equipment
• Medical equipment
• Telecommunications systems

Real Time Clock Procurement Notes

Verify the RoHS compliance status indicated by the '#' suffix against current regulatory requirements. Confirm that the integrated crystal matches the required load capacitance specifications for the target application. Ensure the 16-SOIC footprint aligns with the PCB design constraints.

Real Time Clock Selection Notes

Select this variant over the DS1374U series if a surface-mount package with an integrated crystal is required. The -33 suffix specifies a 3.3V nominal operating voltage range. Verify that the I²C bus speed requirements do not exceed the fast-mode limits defined in the AC electrical characteristics.

Real Time Clock Part Context

This component belongs to the DS1374 family of RTCs manufactured by Maxim Integrated, now part of Analog Devices. The 'C' designation indicates the inclusion of an integrated crystal, distinguishing it from the 'U' series which requires an external component. The '#'' denotes a lead-free/RoHS-compliant package finish.

Real Time Clock Replacement Considerations

The DS1374U-33+ serves as a functional equivalent but requires an external 32.768kHz crystal due to the absence of an integrated oscillator. Pin compatibility remains identical between the C and U variants within the same package type.