CMOS SPDT IC Operation

[daneloctober]

Hello guys! I'm not sure if this is the right forum category to put this in, but anyway, here's my concern:

I'm planning to use a CMOS SPDT IC and I was just wondering if it really, truly acts as a relay? I mean, for example, based on the functional diagram below:

**broken link removed**

If I put 4 volts in S2 with input at logic zero, then is the 4 volts I will get from D actually physically connected to the 4 volt supply in S2? I mean, will the current flowing out from D be actually sourced from the S2 supply?... I'm sorry if this is a dumb question, I'm such a newbie...

Anyway, thank you very much for any help you can give! =)

 

[crutschow]

It will, but the contacts are not isolated and the voltage being switched must generally be within the range of the supply voltages to the switch. The switch will also have some internal resistance (as shown on the data sheet) that may add significant voltage drop depending upon the current through the contacts.