M48T37Y-70MH1F

Real Time Clock Overview

The M48T37Y-70MH1F is a non-volatile static RAM and real-time clock integrated circuit manufactured by STMicroelectronics. It features a 256 Kbit (32 Kbit x 8) memory capacity with a 70 ns access time. The device operates within a 4.5 V to 5.5 V supply voltage range and draws a maximum current of 3 mA during timing operations. Designed for surface-mount applications, it utilizes a 44-lead SOIC package equipped with gold-plated contacts at both ends to interface directly with a separate SNAPHAT housing containing the battery and crystal.

Real Time Clock Feature Summary

• Integrated 256 Kbit SRAM with real-time clock functionality
• Automatic power-fail chip deselect and write protection
• Watchdog timer and programmable alarm output
• Compatible with SNAPHAT battery/crystal housing

Real Time Clock Applications

• Microprocessor systems requiring non-volatile data retention
• Industrial control units needing precise timekeeping
• Embedded devices with battery backup requirements

Real Time Clock Procurement Notes

Verify component status as the M48T59 series indicates end-of-life conditions in public records. Confirm availability of the specific 44-lead SOIC variant and ensure the necessary SNAPHAT housing part number is ordered separately for complete assembly.

Real Time Clock Selection Notes

Select this component when a parallel interface RTC with substantial onboard SRAM is required. Ensure the design accommodates the 44-lead SOIC footprint and integrates the external SNAPHAT module post-reflow to protect the battery from thermal stress during soldering processes.

Real Time Clock Part Context

This part belongs to the Timekeeper® series, which combines ultra-low power SRAM with clock/calendar functions. The 'Y' suffix typically denotes the 5V operating voltage variant, while the '70' specifies the 70 ns cycle time. It serves as a high-density alternative to smaller capacity RTCs like the M48T35.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements are limited due to the specific 44-lead SOIC and SNAPHAT integration. Evaluate other Timekeeper® variants such as the M48T37V for 3.3V operation or standard NVRAM ICs if the RTC function is not strictly required.