View ds2407 datasheet:

DS2407 Dual Addressable Switch Plus 1-kbit Memory www.dalsemi.com Hidden Mode; the device will respond only FEATURES to a Match ROM command or a Conditional Open drain PIO pins are controlled and their Search when in this mode. logic level can be determined over 1-Wire bus for closed-loop control PIN ASSIGNMENT Dual Channel operation (TSOC package) To- 92 PIO pin channel. A sink capability of 50 mA at 0.4V with soft turn-on; channel B 8 mA at 0.4V DALLAS 1 6 DS2407 2 5 Maximum operating voltage of 13V at PIO- 3 4 A, 6.5V at PIO–B 1024 bits user-programmable OTP EPROM TOP VIEW 7 bytes of user-programmable status memory 3.7 X 4.0 X 1.5 mm to control the device Multiple DS2407s can be identified on a common 1-Wire bus and be turned on or off independentl