PT7C4372ALE

Real Time Clock Overview

The PT7C4372ALEX is an I2C bus interface real-time clock module manufactured by Diodes Incorporated. It supports high-speed mode at 400 kHz and provides time (Hour/Minute/Second) and calendar (Year/Month/Date/Day) counter functions using BCD code. The device features a wide timekeeping voltage range of 1.3 V to 6 V and an interface voltage range of 1.8 V to 6 V. Typical current consumption is 0.4 µA at 3.0 V. It includes dual alarm functions, periodic interrupts, oscillation stop detection, and digital clock precision adjustment logic.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports high-speed mode up to 400 kHz with open-drain SDA/SCL pins tolerant to 6V inputs.
• Clock Precision Adjustment: Internal trimming allows frequency correction in units of ±3.051 ppm for 32.768kHz crystals or ±3.125 ppm for 32.000kHz crystals.
• Dual Alarm System: Includes Alarm_A and Alarm_B registers capable of triggering interrupts based on day-of-week, hour, or minute matches.
• Oscillation Stop Detection: Registers indicate data validity to determine if power was lost or backed up.

Real Time Clock Applications

• Systems requiring precise timekeeping with automatic leap year calculation until 2099.
• Low-power embedded devices utilizing external 32.768kHz or 32.000kHz quartz crystals.
• Applications needing periodic interrupt generation ranging from monthly down to 0.5 seconds.

Real Time Clock Procurement Notes

Verify the package type against the ordering suffix; 'ALEX' indicates an 8-pin TSSOP reel packaging format. Confirm RoHS compliance status via the manufacturer's documentation. Ensure the specific revision level matches system requirements as datasheets may undergo updates.

Real Time Clock Selection Notes

Select this component when an I2C-compatible RTC with adjustable clock precision is required. Choose between 32.768kHz and 32.000kHz external crystals based on available oscillator components. Verify that the 1.3V to 6V timekeeping voltage range aligns with the backup power supply capabilities of the target design.

Real Time Clock Part Context

The PT7C4372A/C series are I2C-compliant real-time clocks adjusted for high precision. They feature built-in high-precision clock control logic and support both 12-hour and 24-hour display formats. The internal oscillation circuit operates at a constant voltage to ensure stable 32-kHz output free from voltage fluctuation effects.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.