SN74LVC1G18 is used to switch one pulse sequence signal to different channels. i.e, A0 is connected to the pulses signal with, pulse duty cycle is changing, but frequency is fixed. Y0 and Y1 are output. MCU is used to control the switch logic on pin S. When S is low, pulse sequence goes to Y0. When S is high, pulse sequence goes to Y1. Somehow, When pulse sequence always goes to Y0 no matter S is high or low. What could be the problem?
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