PT7C4302ZEE

Real Time Clock Overview

The PT7C4302ZEE is a low-power real-time clock module manufactured by Diodes Incorporated, housed in an 8-pin TDFN package. It provides timekeeping for seconds, minutes, hours, date, month, day of the week, and year with automatic leap-year compensation valid through 2099. The device features a 3-wire serial interface (SCLK, I/O, RST) and includes 31 bytes of static RAM. It operates on a timing voltage range of 1.2V to 5.5V and a backup voltage range of 1.5V to 5.5V. Typical current consumption is less than 300nA at 2.0V. The component supports industrial temperature operation from -40°C to +85°C and integrates a trickle charger for backup power sources.

Real Time Clock Feature Summary

• 3-wire serial interface requiring only SCLK, I/O, and RST pins for communication.
• Integrated 31-byte nonvolatile static RAM for user data storage.
• Automatic calendar adjustments including leap-year compensation up to the year 2099.
• Built-in trickle charger circuit for recharging backup energy sources such as supercapacitors.

Real Time Clock Applications

• Industrial systems requiring precise timekeeping in harsh environments (-40°C to +85°C).
• Battery-powered devices utilizing supercapacitor or battery backup via the integrated trickle charger.
• Embedded controllers needing minimal pin count for RTC functionality via 3-wire bus.

Real Time Clock Procurement Notes

Verify that the ordering suffix 'ZE' corresponds to the lead-free and green 8-pin TDFN package. Confirm the presence of the 'E' suffix indicates Pb-free and RoHS compliance. Ensure the specific variant matches the required tape/reel or tube packaging configuration listed in the manufacturer's ordering guide.

Real Time Clock Selection Notes

Select this component when a 3-wire interface is preferred over I2C or SPI to minimize pin usage. Ensure the system design accommodates the separate VCC1 (backup) and VCC2 (timing) power domains. Verify that the external crystal load capacitance requirements align with the internal 11pF capacitors or external capacitor values specified for 6pF or 12.5pF loads.

Real Time Clock Part Context

This part belongs to the PT7C4302 series of real-time clocks. The ZEE suffix specifically denotes the 8-pin TDFN (Thin Dual Flat No-lead) package variant. Other package options include SOIC-8. The device was originally developed by Pericom Semiconductor Corporation, which has been acquired by Diodes Incorporated.

Real Time Clock Replacement Considerations

Public datasheets do not list confirmed direct substitute part numbers. When evaluating alternatives, ensure compatibility with the 3-wire serial protocol, 31-byte RAM capacity, and dual-voltage domain architecture. Pin-to-pin replacements must match the 8-pin TDFN footprint and electrical characteristics.