Other Parts Discussed in Thread: ADS7953, SN74AXC4T774, SN74AHCT125, SN74LVC1G34, SN74AHC1G125
hello
we are using the lsf0108 for spi level shift 3V3 to 5V,but on the 5v side,the pull up resistor is 4.7k,the clock(1.5MHz) rising edge is very slow, and the lowest value of the high level is very low(about4.3V,figure1),if i change the pull up resistor to 2k,the max value of the low level is very high(about 0.7V,figure2),but the rising edge has not change.and i try to change 3.3V side resistor and it's not has improve.
the other signal of the spi group all like this
can you give me your advice
figure1 4.7k pull up
figure 2 2.2k pull up
schematic