PT7C4302WE

Real Time Clock Overview

The PT7C4302WE is a Real-time Clock Module manufactured by Diodes Incorporated, utilizing a 3-wire serial interface. It provides timekeeping for seconds, minutes, hours, dates, months, and years in BCD format, supporting both 12-hour and 24-hour modes. The device includes 31 bytes of static RAM and features an integrated trickle charger for battery backup. Operating voltages range from 1.2V to 5.5V for data maintenance and 1.5V to 5.5V for active timing functions. It operates within a temperature range of -40°C to +85°C and requires an external 32.768kHz crystal oscillator.

Real Time Clock Feature Summary

• 3-wire serial interface (SCLK, I/O, RST) with burst read/write capabilities
• Integrated trickle charger with selectable diode and resistor configurations
• 31x8 Static RAM for user data storage
• Oscillator stop flag and write protect functionality

Real Time Clock Applications

• Battery-powered portable electronic devices requiring accurate timekeeping
• Embedded systems needing low-power real-time clock solutions
• Data logging equipment requiring calendar and timestamping functions

Real Time Clock Procurement Notes

Verify the package code 'W' corresponds to the 8-pin SOIC-8 (150mil wide) variant as specified in the ordering information. Confirm RoHS compliance status via manufacturer documentation. Ensure supply chain sources are authorized distributors to avoid counterfeit components. Check for specific lot traceability requirements if applicable to your manufacturing standards.

Real Time Clock Selection Notes

Select this component when a 3-wire interface is preferred over I2C or SPI protocols. Ensure the design accommodates the specific voltage thresholds for VCC1 (backup) and VCC2 (main power). Verify that the external crystal load capacitance matches the recommended values (typically 12pF for CL=12.5pF crystals) to maintain frequency accuracy. Consider the trickle charger settings if connecting a backup battery through a charging circuit.

Real Time Clock Part Context

The PT7C4302 is part of Diodes Incorporated's portfolio of real-time clock modules, succeeding earlier Pericom Semiconductor designs. It serves as a standalone timing solution compatible with various microcontrollers. The 'WE' suffix indicates a lead-free, halogen-free version packaged in tape and reel format for surface-mount assembly.

Real Time Clock Replacement Considerations

Direct pin-to-pin replacements may include other 3-wire RTCs such as the DS1302 series, though electrical characteristics and register maps differ. Verify interface compatibility and voltage levels before substituting. No officially confirmed equivalent part numbers are listed in the provided datasheet.