SN74LVC1G125: Regarding overvoltage condition of output in tri-state for SN74LVC1G125.

Jagdish Karamchandani

Part Number: SN74LVC1G125

Hi TI Support,

We intend to use SN74LVC1G125 & similar buffers in one of our application. I will appreciate answers to some queries related to 3-state output of SN74LVC1G125,

1. What will happen when output voltage (Vo) goes higher than VCC when buffer is in tri-state?

2. Are there any internal clamp diodes which can get forward biased if Vo goes higher than VCC even in tri-state?

3. If answer to point-2 is yes, then we would like to max clamp current for case when Vo> VCC.

4. Can we increase tolerance of Vo to higher voltages by inserting series resistor such that resultant current is lesser than output clamp current?

Thanks,

jagdish

over 6 years ago

0 Emrys Maier over 6 years ago

TI__Guru* 97046 points

Hello Jagdish,

The answers to your questions are found in the absolute maximum ratings table on the datasheet:

If there were an output clamp diode, then the highlighted value would say something like "Vcc + 0.5" instead of just "6.5". There is no clamp diode active on the output when the device is in high-impedance mode.

0 Jagdish Karamchandani over 6 years ago in reply to Emrys Maier

Expert 1420 points

Hello Emrys,

Got it, thanks for your quick support.

Regards,
jagdish

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SN74LVC1G125: Regarding overvoltage condition of output in tri-state for SN74LVC1G125.