SN74LVTH244A: SN74LVTH244ADWR Input/Output Driving

Blake Kuo

Intellectual 300 points

Part Number: SN74LVTH244A
Other Parts Discussed in Thread: SN74LVC244A

Tool/software:

Hi TI team,

We have an application that a pull-up high 3V3 with 10k at input side of SN74LVTH244ADWR as below diagram.

But we found the voltage level of input side is about 0.8V only, there seems like a pull-down drive the volatge to low.

I'm not sure if SN74LVTH244ADWR have any internal pull-down design. If not, it's possible to drive the voltage to low. Could you help to confirm it ?

Thanks.

BRs.

Blake

3 months ago

0 Clemens Ladisch 3 months ago

Guru 295220 points

Bus-hold inputs do work like a pull-up or pull-down (depending on the last input state). In general, it is not possible to use external pull-up/-down resistors with bus-hold inputs.

If you do not need the pull-down, use a device without bus-hold inputs like the SN74LVC244A.

0 Blake Kuo 2 months ago in reply to Clemens Ladisch

Intellectual 300 points

Hi Ladish,

Got it, thanks for prompt support.

BRs.

Blake

Logic

Logic forum

SN74LVTH244A: SN74LVTH244ADWR Input/Output Driving