PT7C4307WEX

Real Time Clock Overview

The PT7C4307WEX is a Real-time Clock (RTC) module manufactured by Diodes Incorporated, featuring an I2C bus interface. It operates within a supply voltage range of 4.5V to 5.5V and supports battery backup from 2.0V to 3.5V. The device includes a time counter supporting both 12-hour and 24-hour formats, along with calendar counters for days, dates, months, and years. It provides 56x8 bits of static RAM for user data storage. The component utilizes an external 32.768kHz crystal connected between X1 and X2 pins and offers a programmable square wave output on the SQW/OUT pin.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard communication protocols with SCL and SDA pins; open-drain SDA requires external pull-up resistor.
• Time and Calendar Counters: Tracks seconds, minutes, hours (12/24 hour selectable), days of the week, dates, months, and years in BCD format.
• Battery Backup: Maintains timekeeping via VBAT pin (2.0V-3.5V) when primary power (VCC) is lost.
• Programmable Square Wave Output: SQW/OUT pin can be configured for frequencies of 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz.

Real Time Clock Applications

• Embedded systems requiring precise timekeeping and calendar functions.
• Data logging devices needing non-volatile time stamps.
• Consumer electronics utilizing I2C communication buses.
• Industrial control systems operating within -40°C to +85°C temperature ranges.

Real Time Clock Procurement Notes

Verify that the ordering suffix 'X' confirms the Tape/Reel packaging format as specified in the datasheet. Ensure compatibility with the required 8-pin SOIC package dimensions. Confirm RoHS compliance status if environmental regulations apply to the final assembly. Check for any specific lead-free definitions provided by the manufacturer regarding halogen and antimony content.

Real Time Clock Selection Notes

Select this component only if the system design accommodates a 4.5V to 5.5V VCC supply voltage. Verify that the I2C bus speed requirements do not exceed the maximum SCL frequency of 400 kHz. Ensure adequate space on the PCB for connecting an external 32.768kHz crystal and necessary load capacitors between X1 and X2 pins. Consider the 56x8 byte RAM requirement for volatile data storage needs.

Real Time Clock Part Context

The PT7C4307WEX belongs to the PT7C4307 series of real-time clock modules. The 'W' indicates the 8-pin SOIC package type, while 'E' denotes lead-free and green manufacturing compliance, and 'X' specifies tape and reel packaging. This part is functionally equivalent to other variants in the series differing primarily in package style or packaging quantity.

Real Time Clock Replacement Considerations

Direct substitutes include other parts within the PT7C4307 family, such as PT7C4307WE (tube packaging) or PT7C4307ZEEX (TDFN package). Verify pinout compatibility and electrical specifications before substitution. No alternative cross-model replacements are confirmed in the provided documentation.