PT7C4311WEX

Real Time Clock Overview

The PT7C4311WEX is a discontinued Real-Time Clock (RTC) module manufactured by Diodes Incorporated. It features an I2C bus interface and includes 56 bytes of non-volatile RAM. The device operates on a single supply voltage ranging from 1.2V to 5.5V, with a typical standby current of 25µA at VCC = 5.5V. It supports 24-hour time format, calendar counting up to the year 2099, and programmable square wave output at 512Hz. The component utilizes a 32.768kHz crystal oscillator connected between X1 and X2 pins and provides battery backup functionality via the VBAT pin.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports Standard Mode (up to 100kHz) and Fast Mode (up to 400kHz).
• Calendar Functionality: Counts seconds, minutes, hours, days, dates, months, and years with leap-year compensation.
• Non-Volatile Memory: Includes 56x8 bits of RAM for data storage.
• Low Power Consumption: Standby current is typically 25µA; battery backup current is 300nA at VBAT=3V.

Real Time Clock Applications

• Data logging systems requiring timestamping.
• Portable electronic devices needing accurate timekeeping.
• Industrial equipment with real-time monitoring requirements.

Real Time Clock Procurement Notes

The PT7C4311WEX part number indicates a Tape/Reel packaging configuration. This specific component is marked as obsolete and discontinued by the manufacturer. Verification of availability should focus on surplus distributors or secondary markets, as direct procurement from Diodes Incorporated is no longer possible.

Real Time Clock Selection Notes

When selecting this component, note that it requires an external 32.768kHz crystal with a load capacitance of 12.5pF. The internal capacitors are specified at 18pF each. Ensure the application voltage remains within the 1.2V to 5.5V range. For RAM writing operations, VCC must be at least 3.0V. The device does not support 12-hour time format natively in its basic function table, only 24-hour.

Real Time Clock Part Context

The 'W' suffix denotes the 8-pin SOIC package (150mil wide), while 'ZE' would indicate the TDFN package. The 'E' suffix confirms lead-free and green compliance. The 'X' suffix specifies the tape and reel packaging method. This distinguishes it from tube-packaged variants like PT7C4311WE.

Real Time Clock Replacement Considerations

As the PT7C4311WEX is discontinued, no official direct replacement is listed in the provided datasheet. Engineers must evaluate alternative RTC ICs with compatible I2C interfaces and similar power specifications. Pin-to-pin replacements are not guaranteed without verifying register maps and electrical characteristics against new candidates.