PT7C43190LE

Real Time Clock Overview

The PT7C43190 is a CMOS real-time clock module featuring a 3-wire (Micro Wire) CPU interface. It operates within a wide voltage range of 1.35 V to 5.5 V, with timekeeping functionality maintained down to 1.25 V. The device includes an internal 32 kHz oscillator circuit and supports automatic calendar calculations up to the year 2099, including leap year adjustments. Key electrical characteristics include a typical current consumption of 0.3 µA at 3.0 V and support for both 12-hour and 24-hour time formats. It provides alarm interrupts, programmable square wave outputs, and free user registers for backup memory applications.

Real Time Clock Feature Summary

• Low power consumption: Typical 0.3 µA at VDD=3.0V
• Wide operating voltage range: 1.35 V to 5.5 V
• Built-in clock adjustment function for frequency calibration
• Auto-calendar with leap year calculation up to 2099

Real Time Clock Applications

• Mobile game devices
• Digital still cameras
• Electronic power meters
• DVD recorders
• TV and VCR systems

Real Time Clock Procurement Notes

Verify package availability as the component is offered in SOIC-8L, TSSOP-8L, and TDFN2x3-8L configurations. Confirm specific ordering suffixes required for the desired footprint. Ensure compatibility with the 3-wire serial interface protocol during system integration.

Real Time Clock Selection Notes

Select this RTC for applications requiring low standby current and minimal pin count via the 3-wire interface. The built-in calibration register allows for precision tuning against temperature variations. Ensure external crystal load capacitance matches the recommended values (6 pF or 12.5 pF) for stable oscillation.

Real Time Clock Part Context

This component belongs to the Diodes Incorporated real-time clock family, designed for battery-backed systems. It integrates a constant voltage circuit and power-on detection logic. The device replaces older discrete timing solutions by combining clock generation, calendar logic, and alarm functions into a single 8-pin package.

Real Time Clock Replacement Considerations

No direct public substitute part numbers are documented in the provided source material. Designers should verify interface compatibility if considering alternative 3-wire RTCs from other manufacturers.

Real Time Clock FAQ

How does the PT7C43190 handle leap years?

The device features an auto-calendar function that automatically calculates leap years up to the year 2099. Any two-digit year that is a multiple of 4 is treated as a leap year.

What is the minimum voltage for timekeeping operation?

The minimum time keeping operation voltage is 1.25 V, allowing the RTC to maintain time data even when the main supply drops below the standard operating range of 1.35 V.

Can the INT pin output frequencies other than alarms?

Yes, the INT pin can output programmable square waves at frequencies of 1 Hz, 2 Hz, 4 Hz, 8 Hz, 16 Hz, or 32.768 kHz, in addition to alarm interrupt signals.