PT7C433833UEX

Real Time Clock Overview

The PT7C433833UEX is a Real-Time Clock (RTC) module manufactured by Diodes Incorporated, housed in an 8-pin Mini Small Outline Package (MSOP). It operates on a 2-wire I2C serial interface with support for standard mode up to 100 kHz and fast mode up to 400 kHz. The device provides timekeeping functions including seconds, minutes, hours, days of the week, dates, months, and years in BCD format. It features a 56-byte static RAM, battery backup capability via VBAT, and a programmable square wave output. Recommended operating conditions specify a supply voltage range of 2.7V to 5.5V and an operating temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports Standard Mode (100 kHz) and Fast Mode (400 kHz) communication protocols.
• Time and Calendar Counters: Provides BCD-coded data for seconds, minutes, hours, day of week, date, month, and year.
• Battery Backup: Includes a dedicated VBAT pin for connection to a 3V lithium cell or energy source to maintain timekeeping during primary power loss.
• Programmable Square Wave Output: SQW/OUT pin can be configured to output frequencies of 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz.

Real Time Clock Applications

• Embedded systems requiring precise time synchronization via I2C bus.
• Data logging equipment needing continuous time tracking with battery backup.
• Consumer electronics utilizing low-power real-time clocking capabilities.

Real Time Clock Procurement Notes

Verify that the ordering suffix 'UEX' corresponds to the 8-pin MSOP package and Tape/Reel packaging configuration as defined in the manufacturer's documentation. Confirm compliance with RoHS directives and lead-free status requirements specific to the project specifications before procurement.

Real Time Clock Selection Notes

Select this component when an I2C-compatible RTC with integrated 56-byte RAM is required. Ensure the system design accommodates the 2.7V to 5.5V supply voltage range and provides external pull-up resistors for the SDA and SQW/OUT open-drain lines. Verify that the application requires the specific oscillator frequency and memory capacity provided by this model.

Real Time Clock Part Context

The PT7C433833UEX belongs to the PT7C4338 series of Real-Time Clock Modules from Diodes Incorporated. The 'U' indicates the 8-MSOP package type, while the 'EX' suffix denotes Lead-free/Green construction and Tape/Reel packaging. This part is functionally consistent with other variants in the series differing primarily in package style and shipping format.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative RTC modules based on I2C compatibility, voltage ranges, and package dimensions if substitution is necessary.

Real Time Clock FAQ

What is the maximum I2C clock frequency supported?

The PT7C433833 supports Fast Mode operation with a maximum SCL clock frequency of 400 kHz.

How is the battery backup connected?

A standard 3V lithium cell or other energy source must be connected to the VBAT pin (Pin 3). If backup is not required, VBAT must be grounded.

What crystal frequency is used for the internal oscillator?

The device utilizes an external 32.768kHz crystal connected to pins X1 and X2. The internal oscillator circuitry is designed for a load capacitance (CL) of 12.5pF.