PCF2123TS/1,118

Real Time Clock Overview

The PCF2123TS/1,118 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power applications. It provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal. The device features a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.25 Mbit/s. Operating voltage ranges from 1.1 V to 5.5 V, with a typical backup current of 100 nA at VDD = 2.0 V and Tamb = 25 °C. It includes an offset register for frequency adjustment, watchdog functionality, and freely programmable timer and alarm functions with interrupt capability.

Real Time Clock Feature Summary

• Ultra-low power consumption: typical 100 nA backup current at VDD = 2.0 V
• High-speed SPI interface with separate combinable data input and output
• Programmable offset register for fine-tuning clock accuracy
• Integrated oscillator load capacitors for CL = 7 pF

Real Time Clock Applications

• Battery powered devices
• Metering equipment
• Time keeping applications
• Low standby power systems

Real Time Clock Procurement Notes

Verify component status as the PCF2123TS/1,118 is listed as End-of-Life (EOL). Confirm availability through authorized distributors or check for alternative packages within the PCF2123 family. Ensure ordering suffixes match required delivery forms such as tape and reel specifications.

Real Time Clock Selection Notes

Select this component when SPI connectivity is preferred over I²C for RTC functionality. Verify that the system supports the 1.1 V to 5.5 V operating range. Consider the TSSOP14 package dimensions if space constraints exist. Ensure external quartz crystals meet series resistance requirements to maintain low power operation.

Real Time Clock Part Context

The PCF2123TS/1,118 belongs to the PCF2123 family of real-time clocks manufactured by NXP Semiconductors. It is available in multiple packages including HVQFN16, TSSOP14, and bare die options. The TS variant specifically denotes the TSSOP14 plastic thin shrink small outline package.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Designers should evaluate other NXP RTCs with SPI interfaces or consult official replacement guides for discontinued components.