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BUY DS1315S-5+ https://www.utsource.net/itm/p/4390815.html
IC RTC PHANTOM PAR 16-SOIC
The DS1315S-5+ is a 5-volt, low-power, real-time clock (RTC) module from Dallas Semiconductor. It is an 8-pin, small outline package (SOP) device. The DS1315S-5+ provides a full binary coded decimal (BCD) clock/calendar plus 56 bytes of non-volatile RAM. It operates from a 32.768 kHz crystal and includes a battery input for continuous timekeeping. The device also features an alarm function and a programmable square wave output. The DS1315S-5+ is designed for use in applications such as personal computers, workstations, network equipment, and other systems requiring accurate timekeeping. (For reference only)