DS1672S-33/T&R

Real Time Clock Overview

The DS1672S-33/T&R is an I2C serial real-time clock featuring a 32-bit binary counter and power-monitoring functions. Designed for surface-mount applications in SOIC-8 packages, it operates within a supply voltage range of 2.97V to 5.5V at VCC, with a backup supply range of 1.3V to 3.63V. The device maintains timekeeping via an external 32.768kHz crystal and includes automatic power-fail detection with a reset output. It supports standard (100kHz) and fast (400kHz) I2C modes, offers trickle-charging capability for backup sources, and functions reliably across an industrial temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• 32-bit binary counter accessible via I2C serial interface
• Automatic power-fail detect and switch circuitry with RST output
• Programmable trickle charger for battery or supercapacitor maintenance
• Low-voltage oscillator operation down to 1.3V on backup supply

Real Time Clock Applications

• Embedded systems requiring precise timekeeping during main power loss
• Data logging equipment needing elapsed time counting
• Industrial controllers operating in wide temperature environments

Real Time Clock Procurement Notes

Verify the specific suffix T&R indicates tape-and-reel packaging when sourcing this component. Confirm RoHS compliance status through manufacturer documentation, as indicated by the '+' designation in related part numbers. Ensure compatibility with existing I2C bus voltage levels and pull-up resistor configurations before integration.

Real Time Clock Selection Notes

Select this variant for surface-mount designs requiring SOIC-8 footprint compatibility. The '33' designation specifies a nominal 3.3V logic threshold, though the device tolerates up to 5.5V on VCC. Ensure the design accommodates the required 32.768kHz crystal with a 6pF load capacitance for accurate timebase generation.

Real Time Clock Part Context

This component belongs to the DS1672 family of low-voltage serial timekeeping chips manufactured by Analog Devices/Maxim Integrated. The 'S' prefix denotes the SOIC package style, while 'T&R' specifies the reel packaging format. It shares core functionality with PDIP and µSOP variants but differs in physical form factor and mounting requirements.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements include other DS1672 variants such as DS1672S-3+ or DS1672U-33+. Verify that substitute parts maintain identical I2C addressing and register maps to ensure software compatibility without modification.