SN74LV244AT: input clamp diodes

Michael Venditti1

Part Number: SN74LV244AT

If VCC is 0VDC, and the inputs to the SN74LV244AT are beginning driven to a TTL high from another active TTL device will the powered off SN74LV244AT input clamp diodes pull DC current and backflow to the VCC of the no powered SN74LV244AT?

over 1 year ago

+1 Emrys Maier over 1 year ago

TI__Guru* 96711 points

Hi Michael,

Per the datasheet, the inputs will be high impedance when VCC = 0V, with a maximum leakage of 5uA across process and temperature variations.

For more info on how to identify if a device has a positive clamp diode or not, please see: [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

We also have some more info on the "Ioff" feature here: [FAQ] What does 'partial power down' or 'Ioff' mean in the datasheet?

Please let me know if I can be of further assistance.

0 Michael Venditti1 over 1 year ago in reply to Emrys Maier

Prodigy 10 points

Thank you for answering my question and the quick response.

0 Emrys Maier over 1 year ago in reply to Michael Venditti1

TI__Guru* 96711 points

Hey Michael,

No problem - we generally get back to people on the same day, although it is common to see delays over holidays / weekends. Come back any time!

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SN74LV244AT: input clamp diodes