Answer:
Thermal impedance for DS1682S+ in 8-pin SO package (package code: S8+5):
Single Layer Board
Theta jA = 170°C/W
Theta jC = 40°C/W
Multi-layer board
Theta jA = 128.40°C/W
Theta jC = 36°C/W
Maximum Junction Temperature: +125°C/W