DS1374U-18_1135805

` 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 to +85 Operating Temperature Range
` 10-Pin SOP, 16-Pin SO
` Available in a Surface-Mount Package with an Integrated Crystal (DS1374C)
` Underwriters Laboratory (UL) Recognized

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

Voltage Range on V_CC Pin Relative to Ground ..................................................................-0.3V to +6.0V
Voltage Range on SDA, SCL, and WDS
Relative to Ground.....................................................................................................-0.3V to V_CC + 0.3V
Operating Temperature Range ..........................................................................................-40 to +85
Storage Temperature Range ............................................................................................-55 to +125
Soldering Temperature Range ........................See the Handling, PC Board Layout, and Assembly section.

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those ndicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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 DS1374 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 DS1374 is programmed serially through an I2C™ serial interface.