PCF8593P,112

Real Time Clock Overview

The PCF8593P,112 is a CMOS clock and calendar circuit optimized for low power consumption. It features an I²C-bus interface with slave addresses A3h (read) and A2h (write). The device includes a built-in 32.768 kHz oscillator and sixteen 8-bit registers. The first eight registers handle clock, calendar, and counter functions, while the next eight serve as alarm registers or free RAM. Operating supply voltage ranges from 2.5 V to 6.0 V for the I²C bus and 1.0 V to 6.0 V for the clock function at 0 °C to +70 °C. Typical operating current is 1 μA at VDD = 2.0 V.

Real Time Clock Feature Summary

• I²C-bus interface with automatic word address incrementing
• Four-year calendar with 24-hour or 12-hour format options
• Universal timer with programmable alarm and overflow indication
• 8 bytes scratchpad RAM available when alarm is disabled

Real Time Clock Applications

• Low power consumer electronics
• Battery powered products
• Electronic metering devices
• Portable instruments

Real Time Clock Procurement Notes

Verify the ordering suffix ,112 corresponds to the SO8 package and reel packing method. Confirm the temperature range matches the application requirements of -40 °C to +85 °C. Ensure the I²C bus speed and voltage levels are compatible with the host controller specifications before integration.

Real Time Clock Selection Notes

Select this component for applications requiring a low-power RTC with integrated calendar and timer functions. Consider the 8-byte RAM capacity if alarm features are not utilized. Verify that the external crystal parameters meet the specified series resistance and load capacitance requirements for accurate timekeeping.

Real Time Clock Part Context

The PCF8593 is part of NXP's low-power clock and calendar family. It shares functional similarities with other RTCs but is distinguished by its specific register map and alarm capabilities. The device is designed for space-saving SO8 packaging, making it suitable for compact electronic designs.

Real Time Clock Replacement Considerations

Check for pin-compatible alternatives within the NXP RTC portfolio. Verify that any substitute supports the same I²C addressing and register structure to minimize software changes. Confirm electrical characteristics such as supply voltage and current consumption meet the original design constraints.