PCF2123U/10AA/1,00

Real Time Clock Overview

The PCF2123U/10AA/1,00 is a bare die CMOS Real-Time Clock (RTC) and calendar optimized for low power applications. It provides timekeeping based on a 32.768 kHz quartz crystal with resolution from seconds to years. Data transfers via a Serial Peripheral Interface (SPI-bus) at up to 6.25 Mbit/s. The device supports alarm and timer functions with interrupt capabilities, an offset register for frequency tuning, and watchdog functionality. Operating voltage ranges from 1.1 V to 5.5 V, with typical backup current of 100 nA at 2.0 V.

Real Time Clock Feature Summary

• SPI interface with maximum data rate of 6.25 Mbit/s
• Low backup current: typical 100 nA at VDD = 2.0 V and Tamb = 25 °C
• Integrated oscillator load capacitors for CL = 7 pF
• Programmable offset register for frequency adjustment

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the ordering suffix /1,00 corresponds to the sawn 6 inch wafer on Film Frame Carrier (FFC) for 6 inch wafer delivery form as specified in the datasheet. Confirm that the bare die package requires appropriate substrate handling and electrical isolation of the substrate wired to VSS during integration.

Real Time Clock Selection Notes

Select this bare die variant when integrating the RTC directly into custom substrates or system-in-package designs. Ensure the design accommodates the 12 bonding pads and provides decoupling close to the device. Verify SPI signal integrity for the 6.25 Mbit/s interface and manage quartz series resistance to maintain low power consumption.

Real Time Clock Part Context

This component is part of the PCF2123 family of SPI real-time clocks. Other variants include packaged versions such as PCF2123BS (HVQFN16) and PCF2123TS (TSSOP14). The bare die version offers flexibility for advanced packaging solutions while maintaining the same functional specifications as the packaged equivalents.

Real Time Clock Replacement Considerations

PCF2123BS/1, PCF2123TS/1, PCF2123U/12AA/1,00, PCF2123U/12HA/1,00, PCF2123U/5GA/1,015 are alternative part numbers within the same family offering different packages or wafer configurations.