PCF8583T/5,512

Real Time Clock Overview

The PCF8583T/5,512 is a clock and calendar chip based on a 2048-bit static CMOS RAM organized as 256 words by 8 bits. It features an I2C-bus interface with operating supply voltages of 2.5 V to 6 V for the bus and 1.0 V to 6.0 V for the clock function at 0 °C to +70 °C. The device includes 240 × 8-bit low-voltage RAM and data retention from 1.0 V to 6.0 V. Operating current is max 50 μA at fSCL = 0 Hz. It supports a four-year calendar, universal timer with alarm, 24/12 hour formats, and 32.768 kHz or 50 Hz time bases. Slave addresses are A1h/A3h for reading and A0h/A2h for writing.

Real Time Clock Feature Summary

• I2C-bus interface with 2.5 V to 6 V operating voltage
• 240 × 8-bit low-voltage RAM with 1.0 V to 6.0 V data retention
• Clock function with four-year calendar and universal timer
• Programmable alarm, timer, and interrupt functions

Real Time Clock Applications

• Consumer channel number display
• Teletext / Broadcast Antiope systems

Real Time Clock Procurement Notes

This product is discontinued and no longer manufactured. Specifications are available for historical reference only. Verify availability through secondary market channels or distributors holding remaining stock. Ensure compatibility with existing designs before procurement.

Real Time Clock Selection Notes

Select this component for legacy designs requiring an I2C RTC with integrated SRAM. Consider the SO8 package (PCF8583T) for surface mount applications. Verify power supply requirements match the 2.5 V to 6 V range for bus operations. Check if newer NXP RTCs with similar interfaces meet current production needs.

Real Time Clock Part Context

The PCF8583 series includes variants such as PCF8583P (DIP8), PCF8583T (SO8), and PCF8583BS (HVQFN20). The PCF8583T/5,512 specifically denotes the SO8 package version. All variants share the same core functionality and pinout configuration for their respective packages.

Real Time Clock Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Review NXP's current RTC portfolio for modern alternatives with I2C interfaces and similar memory capacities.