PCF8523TS/1,118

Real Time Clock Overview

The PCF8523TS/1,118 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. It provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal with resolution from seconds to years. The device operates at clock voltages between 1.0 V and 5.5 V, with a typical backup current of 150 nA at VDD = 3.0 V and Tamb = 25 °C. It features a 2-line bidirectional 1 MHz Fast-mode Plus I2C interface. Key functionalities include freely programmable timers and alarms with interrupt capabilities, selectable integrated oscillator load capacitors (7 pF or 12.5 pF), and an offset register for frequency adjustment.

Real Time Clock Feature Summary

• Low backup current: typical 150 nA at VDD = 3.0 V and Tamb = 25 °C
• 1 MHz Fast-mode Plus (Fm+) I2C interface with read address D1h and write address D0h
• Battery backup input pin with automatic switch-over circuit upon power failure detection
• Freely programmable timer and alarm functions with interrupt capability

Real Time Clock Applications

• Time keeping applications
• Battery powered devices
• Metering

Real Time Clock Procurement Notes

Verify the ordering suffix /1,118 corresponds to tape and reel delivery form as specified in the NXP datasheet. Confirm the package type TSSOP14 matches the required PCB footprint. Check component status, as related variants may be discontinued. Ensure compatibility with system voltage levels within the 1.0 V to 5.5 V operating range.

Real Time Clock Selection Notes

Select this variant when a TSSOP14 package is required for the design. Consider the 1 MHz I2C speed if high-speed communication is needed compared to standard 400 kHz RTCs. Evaluate the need for the specific interrupt configurations and battery monitoring features. Verify that the 7 pF or 12.5 pF internal capacitor options align with the external crystal specifications.

Real Time Clock Part Context

The PCF8523 series includes variants such as PCF8523T (SO8), PCF8523TK (HVSON8), and PCF8523U (bare die). The TS suffix denotes the TSSOP14 plastic thin shrink small outline package. All variants share the same core functionality but differ in physical dimensions and pin configurations suitable for different assembly requirements.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.