M48T129Y-70PM1

Real Time Clock Overview

The M48T129Y-70PM1 is a non-volatile static RAM and real-time clock device from STMicroelectronics. It integrates 1 Mbit (128 Kbit x 8) of SRAM with timekeeping capabilities, programmable alarms, and a watchdog timer. The component operates at 5.0 V or 3.3 V supply voltages and features a 70 ns access time. It utilizes a parallel interface and is housed in a 24-pin PCDIP package. The device includes power-fail control circuitry to ensure data integrity during voltage transitions.

Real Time Clock Feature Summary

• Integrated ultra-low power SRAM combined with real-time clock functionality
• Includes programmable alarm registers and a dedicated watchdog timer
• Features built-in power-fail control circuit for data protection

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and data retention
• Embedded controllers needing non-volatile memory backup
• Telecommunications equipment with watchdog requirements

Real Time Clock Procurement Notes

Verify component availability as this part number may be obsolete. Confirm pin compatibility and electrical specifications against current design requirements before procurement. Check for authorized substitutes if direct sourcing is unavailable. Ensure proper handling procedures are followed for legacy components.

Real Time Clock Selection Notes

Select this component when a combined RTC and non-volatile memory solution is required. Consider the 70 ns speed and dual voltage operation for system integration. Evaluate the need for programmable alarms and watchdog features. Verify package constraints and interface compatibility with the target microcontroller.

Real Time Clock Part Context

This device belongs to the TIMEKEEPER SRAM family, which combines high-speed SRAM with real-time clock functions. The series is designed for applications requiring reliable time tracking and data storage without external battery management complexity. It serves as a compact solution for embedded systems needing both memory and timing capabilities.

Real Time Clock Replacement Considerations

The DS1556-70+ from Analog Devices Inc./Maxim Integrated is listed as a direct substitute. Verify functional equivalence and pinout compatibility before replacement.