Voltage translator / Level Shifter / Buffer which support IO 0.75V with speed up 125MHz

The only level shifters that allow such low voltages are in the AXC family. But at 0.75 V, the worst-case propagation delay is above 100 ns.

For translating down, it would be possible to use a buffer in the AUC family, but even that would not go above 50 MHz.

Hi Woon,

There is no auto-bidirectional device that can support 125MHz translating 0.75V to 1.2V as of this time.

May we know the application that requires such? I.e, what type of signals would the bus/data lines be translating (SPI/I2C etc)? Do you have block diagrams or schematics?

Typically, fixed directional applications (not auto) require such conditions and SN74AXC2T245 would be a better recommendation, thanks.

Best Regards,

Michael.

Hi Woon,

This seems to be a new requirement with FPGA standard as the lower the voltage supply, the lower is the data rate supported and the higher the supply, the stronger is the drive to support higher data rate; in general. And unfortunately, there isn't an alternative recommendation for level shifting 1V <>0.75V at 125MHz.

Best Regards,

Michael.

Hi Woon,

The 1.2V node seems more accurate for your requirement as I have verified 1.2V 3.3V for up to 125MHz and 1.8/1.5V 3.3V up to 160MHz using the AXC EVM in the past and would further recommend for the customer to also test with the EVM per their system/loading requirements, thanks.

Best Regards,

Michael.

Hi Woon,

It depends on how much you are concerned about signal integrity as any translator that supports the voltage range similar to your case and the AXC, will take the 125MHz and level shift the voltage.

However, the signal integrity will not be optimal. Hence, I recommend verifying with the EVM per your system requirements if the signal is okay for you, thanks.

Best Regards,

Michael.

Hi Woon,

I mentioned 5MHz based on loading conditions and what might be acceptable.

Your case might be different. Hence, further suggesting using the EVM to clarify what is acceptable for your case.

The AXC is your best bet, thanks.

Best Regards,

Michael.

Hi Woon,

Unfortunately, I haven't tested the lowest voltage it can support at 62.5Mbps or 31.25MHz as it is uncommon to translate fast speeds at low voltage nodes.

The lowest I have verified in the past have been typical customer applications for 1.2V 3.3V for up to 120MHz or 240 Mbps.

EVM is an evaluation board designed for customers to test the characteristics of the device similar to your case, to suit their system's environment. Please see the product folder under "design & development", thanks.

Best Regards,

Michael.

Hi Woon,

Out of the entire TXP portfolio of devices (translators, buffers, drivers, transceivers), AXC is the best solution that we have. 1.2V <-> 3.3V for up to 120MHz/240 Mbps is the closest use case that has been verified. Based on your exact system requirements, lowest voltage AXC can support at 62.5Mbps/31.25MHz would have to be further verified with the EVM. 

Best,

Swathi