PCF2123U/12AA/1,00

Real Time Clock Overview

The PCF2123U/12AA/1,00 is a CMOS Real-Time Clock (RTC) and calendar component from NXP Semiconductors, packaged in a WLCSP12 wafer level chip size format. It operates on a 32.768 kHz quartz crystal to provide year, month, day, weekday, hours, minutes, and seconds with resolution from seconds to years. The device features a Serial Peripheral Interface (SPI-bus) supporting data rates up to 6.25 Mbit/s. Key electrical parameters include a clock operating voltage range of 1.1 V to 5.5 V and a typical low backup current of 100 nA at VDD = 2.0 V and Tamb = 25 °C. It includes an integrated oscillator with load capacitors for CL = 7 pF.

Real Time Clock Feature Summary

• Real-time clock and calendar functionality based on a 32.768 kHz quartz crystal
• Serial Peripheral Interface (SPI-bus) with maximum data rate of 6.25 Mbit/s
• Low backup current consumption: typical 100 nA at VDD = 2.0 V and Tamb = 25 °C
• Programmable offset register for frequency adjustment and fine tuning

Real Time Clock Applications

• Time keeping applications
• Battery powered devices
• Metering systems
• High duration timers
• Daily alarms

Real Time Clock Procurement Notes

Verify the specific ordering suffix /1,00 corresponds to the sawn 6 inch wafer on plastic Film Frame Carrier (FFC) for 8 inch wafer delivery form as listed in the datasheet. Confirm package type WLCSP12 matches design requirements. Check RoHS compliance status via manufacturer documentation before integration.

Real Time Clock Selection Notes

Select this component when SPI interface compatibility is required over I²C. Ensure the application supports the 1.1 V to 5.5 V supply voltage range. Consider the WLCSP12 package constraints for PCB layout. Verify that the 6.25 Mbit/s SPI speed meets system bus requirements.

Real Time Clock Part Context

This part belongs to the PCF2123 family of ultra-low-power RTCs. Other variants include TSSOP14 (PCF2123TS) and HVQFN16 (PCF2123BS) packages. The U-series denotes bare die or wafer-level packaging options suitable for custom assembly processes.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Evaluate other PCF2123 variants (e.g., PCF2123TS/1) if package changes are acceptable.