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TXS0108E-Q1: txs0108e-q1 output low voltage a little high

Part Number: TXS0108E-Q1
Other Parts Discussed in Thread: SN74LVC244A-Q1


my customer use txs0108eqpwrq1 in orin platform, port a 1.8V, port b 1.8V,

A port input 0v, B port output 0.45V, that over spec, should low than 0.4V.  that is tow chip parallel result in?

B port input 0V, A port output 0.2V.

the Processor request low voltage should <0.4V.

How to let the output low than 0.4V? can I add 10K pull down resistor?

Best regards,

jeff wang

  • The TXS is a passive switch, and the internal pull-up resistors are 40 kΩ for low signals. That 0.45 offset must come from some other device or component pulling the line up.

    Pull-down resistors would conflict with the internal pull-up resistors.

    Why are you using a bidirectional level shifter for unidirectional signals at the same voltage? If you want to buffer the signals, use the SN74LVC244A-Q1.