SN74AXCH1T45: Data rate query

ArTzy

Mastermind 19910 points

Part Number: SN74AXCH1T45
Other Parts Discussed in Thread: TUSB2E22

Hi Experts,

Good day. Is this device also supports 1.2V to 3.3V level translator up to 500Mbps? Info sheet only shows 1.8 to 3.3V.

Please confirm.

Thank you for your guidance.

Regards,
Archie A.

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 322000 points

According to table 6-6, the maximum propagation delay from 1.8 V to 3.3 V is 5 ns.
According to table 6-4, the maximum propagation delay from 1.2 V to 3.3 V is 8 ns.

So it will be slower. I'd estimate the maximum speed to be about 500 Mbps × 5 / 8 ≈ 300 Mbps.

0 ArTzy over 4 years ago in reply to Clemens Ladisch

TI__Mastermind 19910 points

Thanks, Clemens. I am curious if there's a way or there's a component that support this fast with that level of translation.

0 Dylan Hubbard over 4 years ago in reply to ArTzy

TI__Mastermind 47045 points

Hey Archie,

Unfortunately, we wont have a device that would be able to support this. AXC is our fastest low voltage translation family. Do you know what interface/type of signal they are using this device for?

0 ArTzy over 4 years ago in reply to Dylan Hubbard

TI__Mastermind 19910 points

Hello Dylan,

Thanks for your response.

The application is to convert the eUSB voltage levels to USB2.0 voltage levels.
Which is eUSB operate at 1.2V and standard USB2.0 operate at a voltage level of 3.3V
Both will be having a max data rate of 480Mbps.

Thank you for your support.

Regards,
Archie A.

+1 Dylan Hubbard over 4 years ago in reply to ArTzy

TI__Mastermind 47045 points

Hey Archie,

Thanks for the additional info. I recommend reaching out to the Interface product group to see if any of their USB focused devices can perform translation.

+1 Clemens Ladisch over 4 years ago in reply to ArTzy

Guru 322000 points

eUSB signals are differential and bidirectional. Converting between eUSB and USB requires a specialized device like the TUSB2E22.

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SN74AXCH1T45: Data rate query