PT7C43390AWEX

Real Time Clock Overview

The PT7C43390 is a Real-time Clock (RTC) module manufactured by Diodes Incorporated. It features an I2C bus interface and supports both 12-hour and 24-hour time formats. The device operates within a power supply voltage range of 1.35V to 5.5V, with a typical current consumption of 0.3µA during non-communication states at 3.0V. It includes two interrupt pins (INT1, INT2), programmable square wave outputs, and clock calibration capabilities. The component is available in SOIC-8L, TSSOP-8L, and TDFN2x3-8L packages.

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 provide flexible output modes including alarm interrupts, user-set frequencies, and per-minute edge interrupts.
• Clock Calibration: Includes a dedicated register for frequency deviation correction to maintain accuracy.
• Low Power Operation: Typical current consumption is 0.3µA at VDD=3.0V when not communicating.

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing low-power RTC solutions
• Battery-powered devices utilizing the low standby current

Real Time Clock Procurement Notes

Verify package availability as the component is offered in SOIC-8L, TSSOP-8L, and TDFN2x3-8L configurations. Confirm RoHS compliance status for specific manufacturing lots. Ensure ordering suffixes match the required package type and lead-free specifications defined by Diodes Incorporated.

Real Time Clock Selection Notes

Select based on required operating temperature range (-40°C to +85°C) and power supply voltage (1.35V to 5.5V). Consider the need for dual interrupt lines if multiple alarm or periodic signals are required. Verify crystal load capacitance requirements (6pF or 12.5pF) for external oscillator circuit design.

Real Time Clock Part Context

The PT7C43390 belongs to the PT7C43xx series of real-time clock modules from Diodes Incorporated. It shares functional similarities with other I2C-based RTCs but distinguishes itself through dual interrupt outputs and integrated clock calibration registers. It serves as a drop-in replacement for legacy RTCs requiring similar interface protocols.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. When evaluating alternatives, ensure compatibility with I2C addressing, pinout configuration, and register map structures to minimize redesign effort.

Real Time Clock FAQ

What is the maximum SCL clock frequency supported?

The PT7C43390 supports an SCL clock frequency of up to 100kHz in standard mode and up to 400kHz in fast mode.

How is the power-on detection handled?

The device includes a power-on detection circuit that sets the POC flag upon power application. Users must initialize the IC by writing '1' to the RESET bit in Status Register 1 after power-up.

Can the AM/PM flag be used in 24-hour mode?

In 24-hour mode, the AM/PM flag in the real-time data register is omitted. However, reading the hour data will return 0 for hours 00-11 and 1 for hours 12-23.