LSF0108: Maximum performance of LSF0108

Serm Wang

Prodigy 20 points

Part Number: LSF0108
Other Parts Discussed in Thread: SN74AUC17, SN74AUC244

To whom it may concern,

I need to transfer group of 3.3V CMOS signals down-to 1.8V uni-direction.

The clock rate of those signals is 170MHz.

Is that possible for LSF0108 to transfer signals at 170MHz? If not, is there any other part from TI can do it?

Thanks

Serm

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 265250 points

The LSF needs very strong pull-up resistors for high frequencies, and 170 MHz is too much even then.

But for unidirectional downtranslation, you can just use a buffer with overvoltage-tolerant inputs running from the lower supply. For 170 MHz at 1.8 V, you need the AUC family, e.g., SN74AUC17 (6 channels) or SN74AUC244 (8 channels).

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LSF0108: Maximum performance of LSF0108