< br >
74hc541d chip is a high-speed CMOS series chip, this chip has the characteristics of LSTTL high speed and CMOS circuit low power consumption and high noise tolerance, and the Vcc range is 2V ~ 6V, the input signal from the ground to Vcc rise and fall time is 6ns (10% ~ 90%), and when Vcc falls, If the transmission delay is reduced from 5v to 2v, the transmission delay is about two to three times, so the chip is suitable for working at 5V.