PT7C43390LE

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 with burst mode support. The device supports both 12-hour and 24-hour time formats, utilizing BCD-coded registers for seconds, minutes, hours, day of week, date, month, and year. It features an external 32.768 kHz crystal oscillator connection. Electrical specifications include a supply voltage range of 1.35 V to 5.5 V, with current consumption typically at 0.3 µA during standby and 3.5 µA during communication at 3.0 V. The operating temperature range is -40°C to +85°C.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard (100 kHz) and fast (400 kHz) modes with burst read/write capabilities.
• Dual Interrupt Outputs: INT1 and INT2 pins provide configurable alarm interrupts, user-set frequency outputs (1Hz-32kHz), and per-minute edge/periodical interrupts.
• Clock Calibration: Includes a dedicated clock correction register to adjust frequency deviations.
• Power Management: Features power-on detection, low power supply voltage detection (BLD flag), and auto-calendar function up to 2099.

Real Time Clock Applications

• Consumer electronics requiring precise timekeeping
• Industrial control systems with I2C connectivity
• Portable devices needing low-power RTC solutions

Real Time Clock Procurement Notes

Verify the specific package variant (SOIC-8L, TSSOP-8L, or TDFN2x3-8L) required for the design, as the base part number PT7C43390 covers multiple packages. Confirm RoHS compliance status for the specific order suffix. Ensure the I2C pull-up resistors are selected according to the AC electrical characteristics for the target bus speed.

Real Time Clock Selection Notes

Select this component when dual independent interrupt lines are necessary for alarm and timer functions. The wide supply voltage range (1.35V–5.5V) allows compatibility with various logic levels. Ensure the application utilizes an external 32.768 kHz crystal with appropriate load capacitance (typically 6pF or 12.5pF) connected to XIN and XOUT pins.

Real Time Clock Part Context

The PT7C43390 is part of the PT7C43xx series of real-time clock modules from Diodes Incorporated (formerly Pericom). This series provides general-purpose timekeeping with I2C interfaces. The PT7C43390 specifically distinguishes itself with two interrupt pins and clock calibration features compared to simpler single-interrupt variants in the family.

Real Time Clock Replacement Considerations

Check datasheets for other PT7C43xx models (e.g., PT7C4337, PT7C4339) for pin-compatible alternatives. Verify if the replacement supports the required dual-interrupt configuration and I2C burst mode. Ensure the substitute maintains the same operating voltage and temperature ranges.