M48T08-150PC1

Real Time Clock Overview

The M48T08-150PC1 is a 64 Kbit (8 K x 8) non-volatile static RAM module and real-time clock manufactured by STMicroelectronics. It operates within a voltage range of 4.75 V to 5.5 V, with a typical rated supply of 5 V. The device features a maximum access time of 150 ns and functions as a pin-compatible equivalent to JEDEC standard 8 K x 8 SRAMs. It integrates a battery-backed memory solution with calendar and clock capabilities in a 28-pin PCDIP package.

Real Time Clock Feature Summary

• Integrated Real-Time Clock with BCD coded year, month, day, date, hours, minutes, and seconds
• Non-volatile 8 K x 8 SRAM with automatic power-fail chip deselect and write protection
• Pin and function compatible with DS1643 and standard JEDEC 8 K x 8 SRAMs
• Built-in lithium button cell and quartz crystal for long-life timekeeping

Real Time Clock Applications

• Industrial systems requiring persistent data storage and accurate timekeeping
• Telecommunications equipment needing backup memory during power outages
• Embedded controllers utilizing parallel interface for low-latency access

Real Time Clock Procurement Notes

Verify the specific suffix 'PC1' against the manufacturer's current datasheet to confirm package dimensions and RoHS compliance status. Ensure the integrated battery type matches system requirements for longevity. Check for active production status as older NVRAM variants may have limited availability or obsolescence risks.

Real Time Clock Selection Notes

Select this component when a parallel interface is required for direct SRAM replacement without timing modifications. The 150 ns speed suits moderate-frequency microcontrollers. Consider the fixed 5 V supply constraint and ensure the host system can accommodate the 28-pin PCDIP footprint with integrated battery housing.

Real Time Clock Part Context

This part belongs to the M48T08 TIMEKEEPER series, which combines non-volatile memory with RTC functionality. It serves as a drop-in replacement for standard SRAMs in legacy designs while adding timekeeping features. The CAPHAT package design allows for a compact, self-contained battery-backed solution.

Real Time Clock Replacement Considerations

The M48T08 is functionally equivalent to the Dallas Semiconductor DS1643. Verify pinout compatibility before substitution. Other variants in the family include M48T08Y and M48T18, which may differ in package style or speed grade.