View ds2405 datasheet:

DS2405 Addressable Switch www.maxim-ic.com FEATURES PIN ASSIGNMENT TSOC PACKAGE Open-drain PIO pin is controlled by matching 64-bit, laser-engraved registration TO-92 GND NC number associated with each device DS2405 DATA NC Logic level of open drain output can be PIO NC determined over 1-Wire® bus for closed-loop TOP VIEW control 3.7 X 4.0 X 1.5 PIO pin sink capability is greater than 4mA at 0.4V Multiple DS2405s can be identified on a common 1-Wire bus and be turned on or off independent of other devices on the bus Unique, factory-lasered and tested 64-bit registration number (8-bit family code +48- bit serial number +8-bit CRC tester) assures 1 2 3 absolute identity because no two parts are alike Built-in multidrop controller ensures compatibility