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TS3L501E: SPDT Application

Julian Chen
Expert 2550 points
Part Number: TS3L501E

Hi E2E,

IS Bx NC and Cx NO?

If no input voltage, A - B is connect or not?

  • 0
    TI__Mastermind 45430 points

    Julian,

    FET switches don't have a normally closed (NC) or normally open (NO) state because there are no moving parts inside the IC.  Weather or not the A pin connects to B or C depends on the voltage on the logic pins SEL and PD.  

    If there is no voltage on the SEL or PD pins they will float and the A to B/C signal path is undefined and A could connect to either B or C.  To ensure a known state if there is no signal on the control logic SEL and PD pins we recommend placing a weak pull up or pull down resistor to ensure known logic state.  

    If you would like to have the A to B/C signal path disconnected you can set the PD pin to logic high which will place all the signal paths in Hi-Z.

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Expert 2550 points
    Hi Adam,

    Thanks for your reply.

    I have one more question.
    Our customer want to use SPDT Multiplexer which if no VCC input, IC also had NC, NO function.
    Did TI have this solution?
  • 0 in reply to Julian Chen
    TI__Mastermind 45430 points

    Julian,

    No, TI doesn't have a switch that will conduct from the input to output with out power applied to the switch.

    Please see the switches and multiplexers FAQ page for more information.

    Thank you,

    Adam