TPS7H4003-SEP: Using Level Shifter to Step Up a 2.5V SYNC Clock signal to 5V for TPS7H4003-SEP SYNC pins.

Tool/software:

Hi,

I am attempting to design converting a 2.5V Single Ended clock to 5V using SN54SC8T541-SEP (PN54SC8T541MPWTSEP) for CLK SYNCs to the TPS7H4003-SEP Regulator (TPS7H4003MDDWSEP).

According to the datasheet for TPS7H4003-SEP, the CLK SYNC signal has to be greater than 3.5V. We are planning to have the FPGAs on this design generate the clock sync signals. However, our FPGAs can only be designed for 2.5V or lower, so we will need to convert a 2.5V single ended clock signal to 5V so that the regulator can use it and we can configure the clocks potentially different speeds (1 MHz max) and potential phase shifts. I was hoping the SN54SC8T541-SEP could step the 2.5V clock to 5V, but I am unsure if this part can reliably step up the voltage for a switching clock signal.

According to the datasheet of the SN54SC8T541-SEP, it has a max input transition rise or fall time of 20 ns/V, which would be sufficient, but I am unsure if that correlates to what is needed in this particular request.

The clock speed for these clock sync signals will be nominally 500KHz and will will have a total of 7 sync clocks in our design.

I was wondering if the SN54SC8T541-SEP part can handle and step up a 500KHz TTL signal so that the regulator can properly use it for it's switching?

Is there another part that could be recommended that could do this function as well? The stipulation would be that it would need to be a space rated part (30 krad minimum).

Thanks,
Tristan Bodmer