name: PCF8573 function: Clock/calender with serial I/O package: DIP16,16 manufacturer: Philips +--()--+ a0 | 1 16| Vdd a1 | 2 15| Vss1 comp | 3 14| osco sda | 4 13| osci scl | 5 12| test extpf | 6 11| fset pfin | 7 10| sec Vss2 | 8 9| min +------+ This pinout came from the Chipdir: http://www.chipdir.org/