PCF8583BS,518

Real Time Clock Overview

The PCF8583BS,518 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 a built-in 32.768 kHz oscillator circuit and provides 240 × 8-bit low-voltage RAM. Data retention voltage ranges from 1.0 V to 6.0 V, with a maximum operating current of 50 μA at fSCL = 0 Hz. It supports slave addresses A1h or A3h for reading and A0h or A2h for writing.

Real Time Clock Feature Summary

• I2C-bus interface with automatic word address incrementing
• Clock function with four-year calendar and universal timer
• Programmable alarm, timer, and interrupt functions
• Supports 32.768 kHz or 50 Hz time base

Real Time Clock Applications

• Consumer channel number display
• Teletext / Broadcast Antiope systems

Real Time Clock Procurement Notes

Verify component status as the PCF8583BS is listed as no longer manufactured. Confirm availability through authorized distributors or secondary markets. Ensure compliance with RoHS and REACH requirements specified in the ordering information table for the specific suffix version.

Real Time Clock Selection Notes

Select this component for applications requiring a dedicated real-time clock with integrated RAM via I2C. Consider the HVQFN20 package constraints and ensure the system supports the required supply voltage range. Verify that the host controller can handle the specific I2C addressing scheme and interrupt logic defined in the datasheet.

Real Time Clock Part Context

The PCF8583BS is part of the PCF8583 family, which includes variants like PCF8583P (DIP8) and PCF8583T (SO8). All variants share the same core functionality but differ in packaging. The BS variant specifically utilizes the HVQFN20 package, offering a compact solution for space-constrained designs while maintaining the standard pinout for OSCI, OSCO, SDA, SCL, and INT.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the product is discontinued, alternative RTC/Calendar ICs with I2C interfaces must be evaluated for pin compatibility and functional equivalence.