High impedance state in SN74LVC1G3157

Akshat Saraf

Other Parts Discussed in Thread: MSP430F5244, SN74LVC1G3157

Hi,

I want to use SN74LVC1G3157 in my application with MSP430F5244 mcu. In test circuit I have made connection between Select signal of

SN74LVC1G3157 to one of gpio of Mcu. When the mcu is power off or reset, it's gpio is in High impedance state. I want to know when the

Select signal of SN74LVC1G3157 is in High impedance state which signal is selected at the output B1 or B2?

Thanks in advance.

over 8 years ago

0 Emrys Maier over 8 years ago

TI__Guru* 96591 points

What you are describing is a floating input condition. Since the input is not being driven, there is no way to know what hte level is. The best solution is to place a weak pull-up or pull-down (10kohm) on the line to select which position you want for the MCU power-off state.

0 Akshat Saraf over 8 years ago in reply to Emrys Maier

Intellectual 325 points

Hi Emrys,

Thanks for your response.

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High impedance state in SN74LVC1G3157