Inc.The DS1337U+T&R Real-Time Clock I C Serial is a low component count, real-time clock (RTC) used to provide independent timing 100 percent of the year. It features an industry-standard I2C or SPI serial interface, and a unique crystal-less operation that is simpler and more efficient than traditional crystal solutions. This device also provides Configurable Parameters such as Time Alarm, Calendar, and System Reset Features. The Power Supply Voltage is 2.2V to 5.5V, and its Absolute Maximum Ratings are 6V; Output and Clock Frequency Range is 32.768 kHz. The device includes an accurate time-keeping oscillator, several RAM bytes for data storage, and an integrated voltage controlled crystal oscillator or a resistor-capacitor oscillator and a frequency output. Its Memory Map supports 256 x 8-bit RAM, 8 x 8-bit Non-Volatile Registers. Its Package includes 16-Lead SOIC and 16-Ball WLCSP.