M48T12-150PC1

Real Time Clock Overview

The M48T12-150PC1 is a 16 Kbit (2 Kb x 8) non-volatile static RAM and real-time clock manufactured by STMicroelectronics. It integrates an ultra-low power SRAM, a quartz crystal, and a long-life lithium button cell within a specialized 24-pin CAPHAT™ DIP package. The device operates with a supply voltage range of 4.5 V to 5.5 V and features a maximum random access time of 150 ns. It provides automatic power-fail chip deselect and write protection, ensuring data integrity during voltage drops.

Real Time Clock Feature Summary

• Integrated battery-backed memory solution with a self-contained lithium cell providing at least 10 years of data retention in the absence of power.
• Pin and function compatible with JEDEC standard 2 Kb x 8 SRAMs, allowing direct replacement in existing sockets.
• Includes BCD-coded real-time clock registers for year, month, day, date, hours, minutes, and seconds.
• Features automatic power-fail control circuitry that disables writes when VCC falls below the deselect threshold.

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and non-volatile data storage without external backup components.
• Telecommunications equipment needing reliable memory for configuration data and system logs.
• Embedded controllers where space constraints prohibit separate RTC and battery modules.

Real Time Clock Part Context

This component belongs to the M48T12 TIMEKEEPER® SRAM series from STMicroelectronics. It serves as a pin-compatible alternative to similar devices like the DS1642, offering a highly integrated solution that combines memory, timing, and power management in a single through-hole package.

Real Time Clock Replacement Considerations

The M48T12-150PC1 is functionally equivalent to the DS1642. When substituting, verify that the host system's power-fail deselect voltage thresholds align with the M48T12 specifications (VPFD between 4.2 V and 4.5 V).