I was using PSpice model of TMUX1101 in TINA to simulate the functionality of this switch. As per what I understand from datasheet, TMUX1101 is turn on when SEL is 1 and turn off then SEL is 0.
However, when I input 0V to SEL, i still can see voltage passing through from S to D. Is this the TMUX1101 suppose to be?
Hey Yeong Kang,
I took a look into this and it looks like there are two things happening here. Both are associated with how this model was created. So it seems this model only supports Vcc = 5V in TINA. At 5V I can get results when I ran the model. That being said, floating the node seems to cause issues given the way this model was created. The Ron and Roff are modeled as a switch that changes it's resistance in the on state and off state. In the off state, the model will show the resistance (ROFF) as a resistor in series that is represents a high-impedance path. This is still a resistor though. So without a load, it seems that TINA registers the output as a high impedance (infinite) load and you'll effectively creating a voltage divider here with the bottom half of the divider being 'infinite' resistance. So you will see an output.
The switch resistance model for RON and ROFF isn't the most efficient method of create these models and our newer and future models incorporate a different methodology to model the on and off resistance.
Try changing your VCC to 5V and adding a load that will represent your actual load. A 50ohm load may just be good enough here to check functionality.
Thanks,
Rami
