General Description
●The DS1374 is a 32-bit binary counter designed to continuously count time in seconds. An additional counter gen erates a periodic alarm or serves as a watchdog timer. If disabled, this counter can be used as 3 bytes of non volatile (NV) RAM. Separate output pins are provided for an interrupt and a square wave at one of four selectable frequencies. A precision temperature-compensated refer ence and comparator circuit monitor the status of VCC to detect power failures, provide a reset output, and auto matically 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.
●Features
●♦ 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 µSOP, 16-Pin SO
●♦ Available in a Surface-Mount Package with an
●Integrated Crystal (DS1374C)
●♦ Underwriters Laboratories (UL) Recognized
