DS1672U-33

DS1672U-33 is a Dallas/Maxim DS1672 real-time clock/calendar (RTC) device designed for embedded systems. The “-33” indicates 3.3 V operation. It provides timekeeping with a calendar, optional alarms, a watchdog timer, and power-fail/back-up support to preserve time during power loss. It communicates over a 2‑wire (I2C‑like) serial interface and offers a programmable square-wave output. Typical uses include system timekeeping, event stamping, and safe boot sequencing in microcontroller-based designs. For exact registers, timing, RAM/battery-backup details, and electrical specs, consult the DS1672U-33 datasheet.

DS1672U-33 is a Dallas/Maxim 3.3V device that combines a real‑time clock with battery‑backed RAM. Key features:
- 3.3V operation (industrial variant)
- I2C (two‑wire) serial interface
- Real‑time clock/calendar with seconds, minutes, hours, day, date, month, year (leap year support)
- Battery-backed non-volatile RAM (NVRAM) for data retention during power loss (VBAT backup)
- Alarm and periodic interrupt capabilities
- Optional watchdog/timer functionality
- Low quiescent current for battery operation
- Crystal oscillator input (external 32.768 kHz) or internal timing options
- Temperature range suitable for industrial environments
- Available in 8‑pin packages (SOIC/DIP variants)
Note: exact RAM size, I2C speed, and package options may vary by specific part revision; consult the datasheet for precise specifications.

DS1672U-33 is an 8-pin device (in the U package). Its function is a watchdog timer/reset controller for microprocessors; it monitors the watchdog heartbeat and asserts a reset if it isn’t refreshed. (For exact pinout, refer to the datasheet for the specific package variant.)

Manufacturer: Dallas Semiconductor (the DS prefix) — now part of Maxim Integrated, which itself is under Analog Devices.
What kind of company: A US semiconductor company that designs and manufactures integrated circuits for embedded systems (memory, timing/monitoring, analog, power management, etc.).

DS1672U-33 is used where a stable time base, calendar, and power-fail protection are needed. Common application areas include:
- Embedded real-time clock/calendar for data logging and time-stamping
- Battery-backed time reference for industrial, telecom, and networking equipment
- System supervision and watchdog/reset generation to recover from MCU faults
- Power-fail protection and safe shutdown sequencing
- Time stamping and scheduling for automotive, medical, and consumer electronics
- Alarms, timers, and energy-management functions for smart meters and home/industrial automation

DS1672U-33 is in an 8-pin SOIC (small-outline) package.