DS1374C-33#

The DS1374C-33# from Analog Devices is a 32-bit binary counter real-time clock (RTC) with an integrated watchdog timer, trickle charger, and reset output, supplied in a 16-lead SOIC package. The device utilizes an I2C serial interface and a purely binary counter architecture that directly counts seconds from 0 to 2^32−1, eliminating the complexity of BCD date/time registers and facilitating straightforward elapsed-time measurements. A programmable watchdog timer offers multiple timeout periods and drives a dedicated open-drain reset output that can assert upon timeout or during power-up/down events. An on-chip trickle charger circuitry enables backup power from a supercapacitor or rechargeable coin cell, simplifying battery-backed operation.

Typical applications span industrial controls, avionics subsystems, defense electronics, and high-reliability embedded platforms where system health monitoring, precise timekeeping, and fail-safe reset management are critical. The 32-bit counter is particularly well-suited for event timestamps and power-on-hours logging in data loggers and telemetry units. The watchdog timer and reset I/O allow the RTC to monitor a host microcontroller and assert a system reset if software execution stalls, while the trickle charger maintains timekeeping during main power interruptions. Procurement considerations include confirming the temperature range and RoHS status indicated by the C-33# suffix, which typically denotes an industrial operating range (−40°C to +85°C) and lead-free finish. As a Maxim-origin product now manufactured by Analog Devices, engineers should verify lifecycle status for long-term design support and review reliability data when qualifying for aerospace or defense programs.