Part Number: SN74LVC1G3157
When the power supply (VCC) of the switch is off, will the status of the output terminals (B1, B2) be Hi-Z?
The absolute maximum ratings say that you must not exceed VCC. If you apply a voltage when powered off, a current will flow through the clamping diodes into VCC and might power up the device, or anything else connected to VCC.
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Thanks for your question.
Are you looking for a switch that will be high-Z when the switch is powered-off? This is a feature called powered-off protection. SN74LVC1G3157 does not have powered-off protection, and as Clemens mentioned, is at risk of back-powering if a voltage is applied on I/O pins when powered-off.
What is your use case for needing a high-Z state switch when powered-off? Take a look at TS5A3159A which has powered-off protection and is pin-compatible with SN74LVC1G3157 and let me know what you think.
In addition, let me share with you some resources that provide more detail on powered-off protection and how to identify and search for a switch with powered-off protection.
In reply to Clemens Ladisch:
Thank you for your prompt response.
Currently, voltage was applied to the I / O pins when the power was turned off, soI would like to review the circuit because there are concerns that I received comments.
thanks a lot for your help,
In reply to Kate Dickson:
I wanted to take measures against one-sided power supply by wrapping around to the connected external sensor.I would like to consider using the "TS5A3159A" that you have proposed.
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