PT7C43390WEX

Real Time Clock Overview

The PT7C43390 is a Real-time Clock (RTC) module manufactured by Diodes Incorporated. It operates on a 2-wire I2C bus interface and supports both 12-hour and 24-hour time formats. The device functions within a power supply voltage range of 1.35V to 5.5V, with a typical current consumption of 0.3µA at 3.0V when not communicating. It includes an external crystal oscillator input for 32.768kHz timing, two interrupt pins (INT1, INT2), and a programmable square wave output. The component provides clock calibration capabilities and features low power supply voltage detection circuits.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard mode up to 100kHz and fast mode up to 400kHz with burst mode capability.
• Dual Interrupt Pins: INT1 and INT2 support alarm interrupts, user-set frequency outputs (1Hz-32kHz), and per-minute edge interrupts.
• Clock Calibration: Includes a dedicated register for adjusting frequency deviation to maintain accuracy.
• Power Management: Features power-on detection, low voltage detection flags, and auto-calendar functionality through 2099.

Real Time Clock Applications

• Embedded systems requiring precise timekeeping in industrial environments (-40°C to +85°C).
• Battery-powered devices utilizing the low standby current consumption.
• Systems needing multiple interrupt sources for alarm or periodic events via INT1/INT2.

Real Time Clock Procurement Notes

Verify package availability as the datasheet lists SOIC-8L, TSSOP-8L, and TDFN2x3-8L options. Confirm RoHS compliance status for specific manufacturing lots. Check for lead-free and halogen-free certifications if required by project specifications. Ensure ordering suffixes match the desired physical package type.

Real Time Clock Selection Notes

Select based on required operating temperature range and package constraints. The PT7C43390 supports voltages from 1.35V to 5.5V, suitable for various logic levels. Consider the need for dual interrupts; if only one is needed, other variants may suffice. Verify crystal load capacitance requirements (6pF or 12.5pF) for external capacitor selection.

Real Time Clock Part Context

The PT7C43390 belongs to the PT7C43xx series of real-time clocks from Diodes Incorporated. It shares functional similarities with other I2C RTCs but offers specific interrupt configurations and calibration registers. It is designed for applications requiring reliable timekeeping with minimal power consumption and flexible interrupt handling.

Real Time Clock Replacement Considerations

Direct substitutes are not explicitly listed in the provided documentation. When replacing, ensure compatibility with I2C address, register map, and interrupt pin configurations. Verify that the replacement part supports the same voltage range and temperature specifications.