M48T35AV-10MH1E

Real Time Clock Overview

The M48T35AV-10MH1E is a non-volatile static RAM and real-time clock IC from STMicroelectronics' Timekeeper series. It integrates 32 Kbit (32 K x 8) SRAM with BCD-coded calendar and clock functions, including leap-year compensation. The device operates on a parallel interface with a supply voltage range of 3V to 3.6V and draws a maximum current of 2mA during timing. It utilizes a 28-SOH package designed for surface mount technology, featuring a SNAPHAT socket for external battery and crystal integration.

Real Time Clock Feature Summary

• Integrated 32 Kbit Non-Volatile SRAM with byte-wide access
• Real-Time Clock with BCD-coded year, month, day, date, hours, minutes, and seconds
• Automatic power-fail chip deselect and write protection
• SNAPHAT socket compatibility for separate battery/crystal housing

Real Time Clock Applications

• Industrial control systems requiring persistent timekeeping
• Telecommunications equipment needing reliable data retention
• Embedded systems with limited board space for RTC solutions

Real Time Clock Procurement Notes

Verify the specific suffix 'H1E' against official STMicroelectronics documentation to confirm exact packaging or temperature grade variations compared to standard 'H1F' variants. Ensure compatibility with the designated SNAPHAT battery housing part numbers, such as M4T28-BR12SH1 or M4T32-BR12SH1, for proper functionality.

Real Time Clock Selection Notes

Select this component when a parallel interface is required instead of I2C or SPI. The 28-SOH package allows for post-reflow insertion of the battery module, protecting lithium cells from soldering heat. Confirm that the system design supports the 3V to 3.6V operating voltage and accommodates the physical dimensions of the SOIC package plus the SNAPHAT housing.

Real Time Clock Part Context

This part belongs to the M48T35AV TIMEKEEPER family, which combines SRAM and RTC functions in a single monolithic chip. It serves as a pin-compatible replacement for standard JEDEC 32 Kb x 8 SRAMs while adding non-volatility and timekeeping capabilities without requiring special write timing.

Real Time Clock Replacement Considerations

Direct functional equivalents include other M48T35AV variants with different suffixes indicating package or temperature ranges. Verify if alternative packages like DIP CAPHAT are suitable for the application's mechanical constraints.