Other Parts Discussed in Thread: SN74AUP1T08, SN74HCS08, TLV7011
the MCU output driect connect to SN74LVC08A input pin ,when the mcu init start ,there mcu has 1.5V square output , then the SN74LVC08A will have 1.5V square output ,VCC of SN74LVC08A is 3.3V ,
SO the VIH shoud be 2V, if there any way to solve the misoperation , many thanks !
the picture 1 is input and output waveform ,the picture 2 is input and VCC waveform ,about 1.5V .