SN74LVC1G17: Power down current

Inderjit Bains

Part Number: SN74LVC1G17

If VCC = 0V and A = 0V will Y sink current? In our circuit is seems to do that. This is not a problem for the circuitry; is 10mA current sink in this condition safe for SN74LVC1G17DRLR?

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 317000 points

Section 8.1 of the datasheet says:

This device is fully specified for partial-power-down applications using I_off. The I_off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

Can you confirm that the voltage at the V_CC pin is measured to be 0 V?

0 Inderjit Bains over 1 year ago

Expert 2745 points

VCC actually goes down to 0.85V at reset and then gradually decreases to 0.8V before reset de-assertion at 320ms and then goes back up to 3.3V.

0 Clemens Ladisch over 1 year ago in reply to Inderjit Bains

Guru 317000 points

Below the supply voltage minimum limit of 1.5 V, there are no guarantees. But it is indeed possible that the device is still active, and that A = 0 V will drive the output low.

The absolute maximum ratings allow a sink current of 10 mA.

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SN74LVC1G17: Power down current