TXS0108E: Output drive strength question

Shinya Sawamoto

Expert 5260 points

Part Number: TXS0108E

Hello team,

I have a couple of questions regarding TXS0108E output drive strength.

(1) How much impedance does the one shot accelerator have both for Pch-OS and Nch-OS?

(2) What the maximum output load capacitance does the device need to restrict?

Thanks in advance.
S.Sawamoto

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 243120 points

A Guide to Voltage Translation With TXS-Type Translators (SCEA044) says:

During this acceleration phase, the output resistance of the driver is decreased to approximately 50 Ω - 70 Ω to increase the current drive capability of the device.

and

With heavy capacitive loads, the one-shot can time-out before the signal is driven fully to the positive rail. In this scenario, only the pull-up resistors will pull the line high in accordance with its RC time-constant determined by the resistive and capacitive loadings. It is best to avoid this condition by driving capacitive loads less than 70pF when maximum data rate are desired. With capacitive loading >70pF, the TXS-type devices will still successfully operate at lower data rates.

0 ShreyasRao over 4 years ago in reply to Clemens Ladisch

TI__Guru 55970 points

Thanks Clemens.

0 Shinya Sawamoto over 4 years ago in reply to ShreyasRao

TI__Expert 5260 points

Thanks a lot for all the helpful information!

Regards,
S.Sawamoto

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TXS0108E: Output drive strength question