PT7C433833WEX

Real Time Clock Overview

The PT7C433833WEX is a Real-time Clock (RTC) module manufactured by Diodes Incorporated, designed for low-power timekeeping applications. It integrates a 32.768kHz crystal oscillator and provides a 56-byte static RAM for data retention. The device communicates via a standard I2C bus interface supporting Fast mode up to 400kHz. It operates within a supply voltage range of 2.7V to 5.5V on VCC and supports battery backup from 1.5V to 3.7V on the VBAT pin. Key features include automatic leap year correction, programmable square wave output, and an oscillator stop flag. The component is housed in an 8-pin MSOP package.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports Standard mode (100kHz) and Fast mode (400kHz) communication protocols.
• Calendar and Timekeeping: Tracks seconds, minutes, hours, day of week, date, month, and year with automatic leap year adjustment.
• Battery Backup: Maintains timekeeping during power failure using a 3V lithium cell or equivalent source connected to the VBAT pin.
• Programmable Square Wave Output: SQW/OUT pin provides selectable frequencies of 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz.

Real Time Clock Applications

• Embedded systems requiring precise time synchronization
• Data logging devices needing calendar functions
• Low-power consumer electronics with battery backup requirements

Real Time Clock Procurement Notes

Verify that the ordering suffix 'EX' corresponds to the Tape/Reel packaging format as specified in the manufacturer's documentation. Confirm compliance with RoHS directives and lead-free status if required by the assembly process. Ensure the selected distributor sources genuine components directly from authorized channels to maintain product integrity.

Real Time Clock Selection Notes

Select this component when an I2C-compatible RTC with integrated oscillator and non-volatile SRAM is required. Ensure the system design accommodates the 8-MSOP package dimensions. Verify that the external load capacitors meet the equation for the 12.5pF crystal load capacitance to ensure accurate frequency operation.

Real Time Clock Part Context

This part belongs to the PT7C4338 series of real-time clock modules. The specific model PT7C433833 includes the '33' designation indicating specific internal configuration or revision characteristics defined by Diodes Incorporated. It serves as a drop-in replacement for similar I2C RTCs in designs requiring compact surface-mount solutions.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Engineers should consult the manufacturer's official cross-reference tools or datasheets for compatible alternatives with identical pinouts and electrical specifications.

Real Time Clock FAQ

What is the default address for writing to the PT7C433833?

The slave address for write operations is D0h (binary: 11010000).

How does the device handle power transitions?

When VCC falls below the power-fail voltage (VPF), reads and writes are inhibited, but timekeeping continues unaffected via the VBAT backup supply.

Can the SQW/OUT pin be used as a general-purpose output?

Yes, when the SQWE bit is cleared, the OUT bit in the Control register determines whether the pin outputs a high or low DC level.