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SN74LVC1T45 Max Data Rates

Brian Berner
Mastermind 30310 points
Other Parts Discussed in Thread: SN74LVC1T45

Hello,

I was just reading the datasheet for the SN74LVC1T45 and it lists the maximum data rates in a somewhat confusing way. I think I understand it, but I want to explain an example and verify that I understand:

If I am going from 5V, 3.3V, or 2.5 to 1.8V (from VccB to VccA) or in the other direction from 1.8V to 2.5V, 3.3V, or 5V (VccA to VccB) then the max data rate is still only 75Mbps for all levels that translate TO 1.8V?

It seems that there would be a difference between the max data rate for the lower end of translation (i.e. I would assume 75Mbps is a worst case of translating from 5V to 1.8V but that the rate would actually be higher for 2.5V to 1.8V)  Could someone please elaborate on the meaning of this spec?

Thanks!

Brian

  • 0
    TI__Genius 9085 points

    Hi Brian, 

    Translating to a higher voltage(the input 1.8V to output 2.5V, 3.3V, or 5V (VccA to VccB)) will be faster than translating TO a 1.8V output. So if your input is 1.8V and your output is 5V, your max speed will be closer to 300-400Mbps.

    Maximum datarates are more dependent the output buffer VCC (and loading conditions.) Input level buffer VCC will likely have a small effect, but if you're translating from 1.8V to 5V I expect the device to operate well over 75Mbps. 

    If you like, if you give me your system conditions I can see what the device performance will likely be.