M48T35AV-10PC1

Real Time Clock Overview

The M48T35AV-10PC1 is a non-volatile static RAM and real-time clock (RTC) IC from STMicroelectronics' Timekeeper series. It integrates 256 Kbit (32 Kbit x 8) SRAM with BCD-coded calendar and clock functions, including leap year compensation. The device operates on a single 3V to 3.6V supply and features a parallel interface for byte-wide RAM-like access. It includes automatic power-fail chip deselect and write protection mechanisms. The component is housed in a 28-pin CAPHAT package, which combines the silicon die with a quartz crystal and a long-life lithium button cell in a single unit.

Real Time Clock Feature Summary

• Integrated 32 Kbit x 8 Non-Volatile SRAM with Real-Time Clock
• BCD Coded Calendar/Clock: Year, Month, Day, Date, Hours, Minutes, Seconds
• Automatic Power-Fail Chip Deselect and Write Protection
• Battery Low Flag (BOK) Output

Real Time Clock Applications

• Industrial control systems requiring time-stamped data logging
• Telecommunications equipment needing precise timing without external components
• Embedded systems utilizing standard SRAM sockets for non-volatile storage

Real Time Clock Procurement Notes

Verify the specific suffix 'PC1' against official STMicroelectronics documentation to confirm pinout and package compatibility. Ensure the correct battery type is integrated within the CAPHAT housing as specified by the manufacturer's assembly guidelines. Confirm availability of the 28-pin DIP variant if replacing surface-mount designs.

Real Time Clock Selection Notes

Select this part when a combined memory and RTC solution is required in a through-hole DIP format. The CAPHAT package eliminates the need for separate battery and crystal mounting steps. Compare current consumption specifications against system standby requirements, noting the typical operating current at 3V.

Real Time Clock Part Context

This component belongs to the M48T35AV TIMEKEEPER family, designed as a drop-in replacement for standard JEDEC 32Kb x 8 SRAMs while providing non-volatility. Unlike surface-mount SNAPHAT variants, the PC1 suffix indicates a DIP package that houses the battery and crystal internally, simplifying assembly for legacy or high-reliability applications.

Real Time Clock Replacement Considerations

Direct functional equivalents include other M48T35AV variants with different packaging, such as the SOIC-based M48T35AV-10MH1F paired with a compatible SNAPHAT battery module. Verify voltage levels and interface timing before substitution.

Real Time Clock FAQ

Does the M48T35AV-10PC1 require an external battery?

No, the CAPHAT package integrates a long-life lithium button cell directly with the silicon die and quartz crystal.

What is the date format supported by this RTC?

The device supports a YY-MM-DD-dd date format with BCD coding.

How does the device handle power failure?

It features an automatic power-fail circuit that performs chip deselect and protects data during power transitions.