M48T35AV-10MH6F

Real Time Clock Overview

The M48T35AV-10MH6F is a 256 Kbit (32K x 8) non-volatile static RAM integrated with a real-time clock and power-fail control circuit. Manufactured by STMicroelectronics, it operates at a maximum access time of 100 ns in a 28-lead SOIC package. The device provides JEDEC-standard pin compatibility for 32 Kb x 8 SRAMs. It features automatic power-fail chip deselect and write protection, with a specific power-fail deselect voltage range of 2.7V to 3.0V for the 'V' suffix variant. The component is designed for surface-mount assembly, allowing a separate SNAPHAT battery housing to be mounted on top after reflow.

Real Time Clock Feature Summary

• Integrated ultra-low power SRAM, real-time clock, and power-fail control circuit
• Automatic power-fail chip deselect and write protection (VPFD: 2.7V ≤ VPFD ≤ 3.0V)
• Battery low flag (BOK) and frequency test output for the real-time clock
• BCD coded year, month, day, date, hours, minutes, and seconds

Real Time Clock Applications

• Data logging systems requiring non-volatile memory retention
• Industrial controllers needing real-time clock functionality
• Embedded systems utilizing standard SRAM sockets for easy integration

Real Time Clock Procurement Notes

Verify that the SNAPHAT battery housing is ordered separately, as it is not included with the SOIC package. Confirm the specific suffix requirements for power-fail voltage thresholds and temperature ranges against the design specifications. Ensure the ordering part number matches the exact package and speed grade required for the application.

Real Time Clock Selection Notes

Select this component when a combined SRAM and RTC solution is needed without external battery management logic. The 'V' suffix indicates a lower power-fail deselect voltage (2.7V–3.0V) compared to the 'Y' variant. Consider the SNAPHAT packaging options (M4T28-BR12SH1 or M4T32-BR12SH1/6) based on required battery capacity and operating temperature range.

Real Time Clock Part Context

This part belongs to the M48T35AV TIMEKEEPER family, which integrates memory and clock functions into a single monolithic chip. It serves as a non-volatile equivalent to standard JEDEC SRAMs, allowing direct replacement in existing designs while adding timekeeping capabilities. The SOIC package variant specifically enables post-reflow battery insertion to protect the lithium cell from soldering heat.

Real Time Clock Replacement Considerations

Direct functional substitutes include other parts within the M48T35AV series, such as M48T35AV-10MH1F. When replacing, ensure the new part supports the same 28-lead SOIC package and compatible SNAPHAT battery housing interface.