PT7C4363BWEX

Real Time Clock Overview

The PT7C4363BWEX is a discontinued Real-time Clock (RTC) module manufactured by Diodes Incorporated. It utilizes an external 32.768kHz crystal and communicates via a 2-wire I2C bus interface supporting up to 400 kHz. The device provides timekeeping in 24-hour format with a century bit, calendar counters for date and day of the week, and alarm functions. Operating voltage ranges from 1.3V to 5.5V, with standby current typically at 450nA at 5.0V. It features oscillator fail detection, programmable square wave output, and timer interrupts.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard mode up to 400 kHz with dedicated SDA and SCL pins.
• Time and Calendar: Tracks seconds, minutes, hours (24-hour), dates, months, days of the week, and years with a century bit.
• Low Power Consumption: Standby current is typically 450nA at VCC=5.0V and 400nA at VCC=3.0V.
• Alarm and Timer: Includes comparator alarm registers and a programmable countdown timer with interrupt capabilities.

Real Time Clock Applications

• Embedded systems requiring precise timekeeping and calendar tracking.
• Battery-powered devices needing low standby current consumption.
• Industrial equipment utilizing I2C communication protocols.
• Consumer electronics requiring alarm or timer interrupt functions.

Real Time Clock Procurement Notes

This component is officially marked as PART OBSOLETE and DISCONTINUED by Diodes Incorporated. Verify availability through authorized distributors for remaining stock only. No new production is expected. Ensure compatibility with existing designs before procurement due to end-of-life status.

Real Time Clock Selection Notes

Select this part only if legacy support is required, as it is discontinued. Ensure the design accommodates the 1.3V to 5.5V operating range and requires an external 32.768kHz crystal. Verify that the I2C address (0x6E/0x6F) fits within the system bus architecture. Consider replacement options if long-term supply assurance is necessary.

Real Time Clock Part Context

The PT7C4363B series is part of Diodes Incorporated's portfolio of real-time clock modules based on Pericom technology. The 'W' suffix indicates an 8-pin SOIC package, while 'EX' denotes tape and reel packaging. This specific model integrates oscillator, counter, and alarm logic into a single IC for cost-effective timekeeping solutions.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. As the part is discontinued, engineers should consult Diodes Incorporated for recommended obsolescence management strategies or equivalent modern RTC alternatives.

Real Time Clock FAQ

What is the default I2C slave address for the PT7C4363B?

The write address is 0xA2 (binary 10100010) and the read address is 0xA3 (binary 10100011).

How does the PT7C4363B handle oscillator failure?

It includes an Oscillator Stop Flag (OSF) bit in the Seconds register (Address 02). When set to logic 1, it indicates that clock integrity is no longer guaranteed.

Can the power-on reset be overridden?

Yes, the TESTC bit in the Control/Status 1 register (Address 00) can be set to logic 1 to enable the power-on reset override facility.