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Questionf of SN74LVC8T245 OE signal

Hello There

My name is Jacob and I am Field Application Engineer in TI Korea.

One of my customer is applying SN74LVC8T245PWR and he has one problem.

He controled SN74LVC8T245PWR's enable by OE signal from system.

However System generates high siganl and low signal.

SN74LVC8T245PWR OE pin didn't go down to low level and still stayed high level after system tried to go low level.

When I measured OE pin and it was high level. When SN74LVC8T245PWR disconnected with system and I meausured System output for OE signal, it can generates low level.

Do you have any idea about this problem?

Accroding to customer, he said system's output pin was pull down with 80K ohm and our SN74LVC8T245PWR also looks like pull down.