Other Parts Discussed in Thread: SN74ACT245
Tool/software:
When using the SN74LVT244B chip, pin 1 and pin 19 are connected to the ground. When the input pin is left floating, the output pin can output 3.3V high level signal (the VCC of the chip input is 3V3). What causes this?
When using the SN74ACT245 chip, we connect both pin 19(Output Enable) and pin 20(Power Pin) to the VCC 5V power supply, and the rest of the pins are left floating. After testing, all the data transceiver pins have 1.6V voltage difference to the ground. What causes this situation?