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TRS3122E: FORCEOFF# input structure

Urban Mueller

Prodigy 70 points

Part Number: TRS3122E

Hi

The TRS3122E datasheet states in absolute maximum rating section that FORCEOFF# may go from -0.3 to +6V, recommended is maximum VL.
What happens if both power supplies VL and VCC of the TRS3122E are down but there is a pullup resistor 1kOhm connected from FORCEOFF# to an active 1.8V supply?
Does this generate a current flow through a diode in the input structure to VL or VCC (GND when off)?
If yes, what is the maximum input current allowed indefinitely through this diode without generating any damage and what is the voltage drop through this diode?

Regards
Urban

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 316690 points

The absolute maximum rating implies that there is no diode to V_L; see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)? No current will flow.

0 Urban Mueller over 2 years ago in reply to Clemens Ladisch

Prodigy 70 points

Thanks for the FAQ link!
Can I rely on this? There is also no input clamp current to GND in the datasheet.

+1 Clemens Ladisch over 2 years ago in reply to Urban Mueller

Guru 316690 points

Yes, the FAQ is correct.

If there is no specification for the GND diode current, then you must not apply voltages below GND. (The diode is only for ESD protection.)

0 Eric Hackett over 2 years ago in reply to Clemens Ladisch

TI__Guru 74252 points

Thanks for the help Clemens!

Urban,

Please let us know if you have any other questions.

Regards,

Eric Hackett

0 Urban Mueller over 2 years ago in reply to Eric Hackett

Prodigy 70 points

Hi Eric and Clemens

Thanks for your help! I'll close the case.

Regards,
Urban