My electronics background isn't too strong at this point, so I'm seeking a bit of advicedirection.

My application has an 8051 input pin that is normally connected to a serial TTL "rx" output. The serial output of course toggles between 0 and 5 volts.

I would like to "disconnect" this connection externally without resorting to using a mechanical switch or changing RS232-TTL converter ICs.

So this device would normally be on (conducting) and I would want to use an additional I/O line to switch it off (disconnect).

In the "on" state, i don't want it consuming execess current (more than a mA) and it needs to be cheap.

I'm so confused as to if I should use a JFETMOSFET type device or what?!?! What is my cheapest option?

Thanks for the edumacation!
Mika