AM26LS32AID Power Off Input Leakage

Tom Roe1

I cannot find any information on the AM26LS32AID input leakage when powered down. The data sheet for the DS26 series does give this info but I don't like the package it comes in and would rather use the AM26LS32 SOIC. I need to know when the power rail is down, will the differential inputs bleed into the power rail from the input driver on another board that is powered? I would like a spec on the current leakage similiar to IOff spec if possible. I do see a typical input shows 100K in series before the first transistor but I know sometimes there is protection diodes that may allow a path from the input to the VCC rail. Thanks Tom

over 12 years ago

0 Ron Michallick over 12 years ago

TI__Guru**** 165276 points

Tom,

The input schematic on page 3 of the data sheet can be used to check VCC bleed.
There is a 100k resistor from "A" input to VCC. This current to VCC is about 10uA/V.

This device does not have protection that terminates to the VCC rail.
If time permits, I will verify this in the lab Wednesday. Otherwise next week.

0 Tom Roe1 over 12 years ago in reply to Ron Michallick

Prodigy 90 points

Ok Thanks Ron. I just got nervous before we went to fab. I saw the schematic but then I thought about protection diodes. If you test it I would be great full, I don't have any parts yet. I have to push a PL through before they order anything.

Thanks again

Tom

0 Ron Michallick over 12 years ago in reply to Tom Roe1

TI__Guru**** 165276 points

Tom,

I checked the device in the lab. The only current to VCC when un-powered is the internal pull up resistors on "A" inputs.

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AM26LS32AID Power Off Input Leakage