Other Parts Discussed in Thread: TXU0202, SN74AVC2T244
Tool/software:
We are using PCA9306DCTR as a level shifter from 1.8V to 3.3V and vice versa. The schematic has been attached below for reference.
I am feeding a 1.8V signal through "UART_FROM_MDM_TO_ESP32_1V8" and receiving 3.3V level shifted signal on the other side. The signal on the other side looks like this.
Even though the comm is working, the rising edge behavior goes as : The signal rises to 1.8V easily, takes the most time (~200 nS) to reach 3.3V from 1.8V. We have used the same 200k resistor for Vref2 as mentioned in datasheet. Vref1 comes from a Modem and is stable. There are no pull-ups being used on 1.8V side. and we are currently using 1k resistor pull-ups on the 3.3V side. Can anyone tell me the reason for this high rise time (200 nS) ? Is there a workaround for this ?
