Other Parts Discussed in Thread: SN74AVC4T774, SN74LVC3G17, SN74LV1T34, SN74LVC3G34
Hello,
I would like to use the LSF0204-Q1 for level translation in an SPI communication.
Therefore I would like to use the following circuit:
That's why I designed the following PCB design:
(Tx/Rx can be ignored)
For pure test purposes I use an Arduino Uno, which outputs 5V (digital) pulses. These should then be set to 3.3V.
VrefA = 3.3V large, VrefB = 5V.
If I now set 5V pulses to B1 without connecting the Vdds first, B1 will not output any signals.
If I now connect Vdd, then B1 always takes the signal from Vdd, as it can be seen in the following picture:
I have tested all possible configurations. So to set the EN pin high with different levels, to connect Vdd and Vref with each other, to use only Vref for the Rpu. No success. Either B1 remains zero or it assumes the respective level, but doesn't pulse slightly delayed with 3.3V.
Can you tell me what I'm doing wrong?
Best regards