M48T37Y-70MH6E

Real Time Clock Overview

The M48T37Y-70MH6E is a non-volatile static RAM and real-time clock (RTC) from the TIMEKEEPER family, manufactured by STMicroelectronics. It integrates 256 Kbit (32 Kbit x 8) SRAM with timekeeping capabilities in a 44-lead SOIC package designed for SNAPHAT integration. The device operates on a 5.0 V supply with access times of 70 ns. Key features include an integrated battery backup switch, power-fail control circuit, watchdog timer, and programmable alarm output. It supports parallel interface communication and includes automatic write protection during power failures.

Real Time Clock Feature Summary

• Integrated 256 Kbit (32K x 8) Non-Volatile SRAM with Real-Time Clock
• SNAPHAT Compatible: 44-lead SOIC package allows direct connection to separate battery/crystal housing
• Power-Fail Control: Automatic chip deselect and write protection when VCC drops below threshold
• Watchdog Timer and Programmable Alarm Output active in battery backup mode

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and data retention
• Telecommunications equipment needing reliable backup memory
• Embedded controllers utilizing SNAPHAT battery solutions

Real Time Clock Procurement Notes

Verify the specific suffix MH6E against the manufacturer's current datasheet to confirm package type and temperature range. Ensure the SNAPHAT battery housing (e.g., M4T28-BR12SH or M4T32-BR12SH) is ordered separately as it is not included with the IC. Confirm RoHS compliance status for the specific manufacturing batch.

Real Time Clock Selection Notes

Select this component when a high-density NVSRAM solution with integrated RTC is required in a surface-mount format that accommodates a top-mounted battery. Compare with the M48T37V if a 3.3V supply is needed instead of 5.0V. Ensure the design accounts for the separate ordering of the SNAPHAT housing containing the lithium battery and crystal.

Real Time Clock Part Context

This part belongs to the TIMEKEEPER series of battery-backed RAMs. Unlike standard DIP packages, the M48T37Y utilizes a unique SOIC form factor designed specifically for the SNAPHAT system, where the battery and crystal are mounted on top after reflow soldering to protect them from heat.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements may be limited due to the specific SNAPHAT socket requirement. Check for other M48T37 variants (e.g., M48T37V for 3.3V operation) or newer TIMEKEEPER generations with integrated batteries if SNAPHAT compatibility is not strictly required.