SN74AXC8T245: Can 8 channels transmit clock signals simultaneously？

?? ?

Part Number: SN74AXC8T245

I saw in the datasheet of SN74AXC8T245 that，“Simultaneous up and down translation is supported when both VCCA and VCCB are at least 1.40V.”.

I don't quite understand the specific meaning of "Simultaneous up and down translation". Does it refer to 8 channels jumping simultaneously? And why is there a requirement for the power supply voltage at both ends？

Our need is that when VCCA is 3.3V, VCCB is 1V, all 8 channels are unidirectional transmission and change simultaneously in 1M clocks. Can it be supported?

Sincerely looking forward to the answers from TI.

10 months ago

+1 Clemens Ladisch 10 months ago

Guru 287650 points

"Simultaneous up and down translation" refers to the preceding description in the paragraph, when DIR1 and DIR2 have different values.

What directions do you want to use?

0 ?? ? 10 months ago in reply to Clemens Ladisch

Prodigy 10 points

Thanks for your reply.

DIR1=L, DIR2=L and DIR1=H, DIR2=L is what I need.

And Is it possible to work at low power supply voltage（eg：1V——1.2V） as long as channel A and channel B are always in the same direction.

0 ?? ? 10 months ago in reply to Clemens Ladisch

Prodigy 10 points

Can I understand that if channel A and channel B are not working in the same direction, then there is a requirement for the power supply voltage（>1.4V）

0 Michael Ikwuyum 10 months ago in reply to ?? ?

TI__Mastermind 34265 points

Hi,

The device will work just fine once all supplies are stable and fully ramped up as the recommendation is just for optimal performance while ramping up supplies, thanks.

Best Regards,

Michael.

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SN74AXC8T245: Can 8 channels transmit clock signals simultaneously？