MAXIM DS1374U-3+T&R

The DS1374 is a 32-bit binary counter designed to continuously count time in seconds. An additional counter generates a periodic alarm or serves as a watchdog timer. If disabled, this counter can be used as 3 bytes of nonvolatile (NV) RAM. Separate output pins are provided for an interrupt and a square wave at one of four selectable frequencies. A precision temperature-compensated reference and comparator circuit monitor the status of VCC to detect power failures, provide a reset output, and automatically switch to the backup supply when necessary. Additionally, the reset pin is monitored as a pushbutton input for externally generating a reset. The device is programmed serially through an I2C serial interface.

• 32-Bit Binary Counter
• Second Binary Counter Provides Time-of-Day Alarm, Watchdog Timer, or NV RAM
• Separate Square-Wave and Interrupt Output Pins
• I2C Serial Interface
• Automatic Power-Fail Detect and Switch Circuitry
• Single-Pin Pushbutton Reset Input/Open-Drain Reset Output
• Low-Voltage Operation
• Trickle-Charge Capability
• -40°C to +85°C Operating Temperature Range
• 10-Pin uSOP, 16-Pin SO
• Available in a Surface-Mount Package with an Integrated Crystal (DS1374C)
• Underwriters Laboratories (UL) Recognized

• Portable Instruments
• Point-of-Sale Equipment
• Medical Equipment
• Telecommunications