M48T86PC1

Real Time Clock Overview

The M48T86PC1 is a 5.0 V PC real-time clock manufactured by STMicroelectronics. It integrates non-volatile RAM and timekeeping functions in a single package. The device supports parallel bus interfaces for data communication. It maintains calendar and clock information using BCD-coded formats for year, month, day, date, hours, minutes, and seconds. The component operates within a standard voltage range of 4.5 V to 5.5 V. It features an integrated battery backup system to ensure continuous operation during power failures. The unit is housed in a PCDIP-28 package suitable for through-hole mounting.

Real Time Clock Feature Summary

• Integrated Real-Time Clock with Calendar and Non-Volatile RAM
• Parallel Bus Interface for System Connectivity
• Integrated Battery Backup Switching Circuit
• BCD Coded Date and Time Formats

Real Time Clock Applications

• Personal Computer (PC) systems
• Industrial control equipment requiring time stamping
• Data logging devices

Real Time Clock Procurement Notes

Verify the specific access speed variant required, as the M48T86 series includes different speed grades such as -70. Confirm the exact package type and pinout compatibility with the target PCB footprint before ordering. Ensure the supply voltage matches the 5V logic levels specified for this component.

Real Time Clock Selection Notes

Select this component when a parallel interface RTC with integrated memory is required for 5V systems. Compare access times against system bus requirements. Verify that the PCDIP-28 package fits the mechanical constraints. Check if the integrated battery life meets the long-term deployment needs without maintenance.

Real Time Clock Part Context

This part belongs to the M48T86 family of PC real-time clocks from STMicroelectronics. It serves as a direct replacement or equivalent for legacy Dallas Semiconductor DS12887 devices. The family provides combined RTC and NVRAM functionality in a compact DIP package, widely used in older PC architectures and industrial controllers.

Real Time Clock Replacement Considerations

The M48T86PC1 is functionally compatible with the Dallas Semiconductor DS12887. Other variants in the M48T86 series may differ in access speed but share the same pinout and functionality.