Hi, we are testing SN74AXC4T245 performance in the hope that we can use it as 3.3 to 1 V level translator. The pulse frequency operates at either 120 MHz or 60 MHz. We verified that at the input of the level translator, it is a very clear square wave train. But at the output, the waveform is distorted a lot. The problem is at rising edges mostly. For example, when operating at 60 MHz, the waveform suppose to rise within 2.5ns, and instead it takes about ~5 ns. The result of it is that the output waveform has a very long rising slew rate and makes the entire waveform distorted.
I ruled out the possibility of large parasitic capacitance on the PCB board by cutting the signal trace at the output side and directly probed the pads.
I checked the datasheet and did not see anything obvious that suggests the device can not be used in this situation. I wonder if you have test out the device under 3.3V to 1V level translation and what is the highest frequency we can apply in this scenario or if I have to use it at 120 MHz, what is the minimum voltage I can downconvert from 3v3 to? Thanks!
Che
