What the Phantom Time Chip does on the board
The DS1315SN-5+ is a Phantom Time Chip — a real-time clock (RTC) that sits on a parallel bus and only draws attention when the host reads or writes time data. It keeps YY-MM-DD-dd date and HH:MM:SS:hh time in 12/24 hr format, with leap-year compensation built in. The parallel interface means it connects directly to a microcontroller's data bus without a serial protocol layer — useful when the host has spare address/data lines and wants minimal firmware overhead for timekeeping.
Package, supply, and temperature range
Housed in a 16-SOIC wide-body package (0.295" body width, 7.50 mm), the DS1315SN-5+ is surface-mount and rework-friendly — the gull-wing leads are visible for inspection and easy to hand-solder or hot-air reflow without lifting pads. Timekeeping current draws 1.3 mA max at 5 V, so a small coin cell keeps the clock alive through power loss.