TXS0104E - Does enabling the "High Impedance" state disconnect the internal 10k pullup resistors?

Sadanori Kato

Other Parts Discussed in Thread: TXS0104E

Hi,

According to the TXS0104E data sheet, there is mentioned that all outputs are placed in the high impedance state if the OE pin is low.
So, does "the high impedance state" mean the internal 10kΩ pull-up resistors ?

Best regards,
Kato

over 9 years ago

0 Nirav Patel over 9 years ago

TI__Expert 6335 points

Sadanori,

I will need to double check in the lab. I will try to get back to you next week.

Best Regards,
Nirav

0 Sadanori Kato over 9 years ago in reply to Nirav Patel

Guru 36540 points

Hi Nirav-san,

Thank you for your support.
I am looking forward to hearing the detailed information from you.

Best regards,
Kato

0 Sadanori Kato over 9 years ago in reply to Sadanori Kato

Guru 36540 points

Hi Nirav-san,

Do you have any updates for my question ?

Best regards,
Kato

0 Nirav Patel over 9 years ago in reply to Sadanori Kato

TI__Expert 6335 points

Kato-San,

Sorry for the delayed response. The TXS0104E High-Impedance state does NOT include the internal 10 kΩ pullup resistors.

The lab data below shows the measurement results where I grounded the inputs and enabled Hi-Z.

VCCA	VCCB	OE	A1	Measured current out of A1	Expected current out of A1 if 10 kΩ path between A1 and VCCA
1.80V	3.30V	0V	0V	< 1 µA	180 µA

VCCA	VCCB	OE	B1	Measured current out of B1	Expected current out of B1 if 10 kΩ path between B1 and VCCB
1.80V	3.30V	0V	0V	< 1 µA	360 µA

If there was a path through the internal 10kΩ resistors, then the current draw out of the pin would be approximately:

(1.8V - 0V)/(10000Ω) = 180 µA for pins A1 through A4
(3.6V - 0V)/(10000Ω) = 360 µA for pins B1 through B4

However, the lab measurements shows measured input current of < 1 µA.

Best Regards,
Nirav

0 Sadanori Kato over 9 years ago in reply to Nirav Patel

Guru 36540 points

Hi Nirav-san,

Thank you for your strong support.
I understood.

Best regards,
Kato

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TXS0104E - Does enabling the "High Impedance" state disconnect the internal 10k pullup resistors?