TXB0108 3.3V to 1.8V Tranlation

herbe,

herbe chun said:

Q1.  Assuming IIL/IIH > 20mA which should be enough to over drive translator B, what is does the input translation

rise or fall rate max spec (40ns/v) mean?  Does this mean that the edge rate should be faster then 40ns/v x 3.3v = 132ns

or slower then 132ns.

It should be faster than 132 ns. When you mention 20 mA, is that from a current source?

herbe chun said:

Q2.    Neglecting the edge rate spec and only considering the min pulse width of 17ns, does this mean that the

max frequency of the part is 1/pulse width = 58MHz?

With VCCA = 1.80V and VCCB = 3.30, the maximum frequency is specified in the datasheet as 60 Mbps, which is equivalent to a 30 MHz clock.

Would you be willing to provide me with the following:

1. Schematic

2. Oscilloscope waveform capture of input and output.

Best Regards,
Nirav

Hi Nirav, yes, I would like to send you the schematic first. Should I send it directly to you and if so, what is your email id? If not how do I post to this inquiry chain? -Herbe (mrherbechun@gmail.com)

Herbe,

Either way is ok. Whatever you prefer.

Upload Instructions

nirav-patel@ti.com

Best Regards,
Nirav