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In the case of switching from standby to any input (e.g. IN1), it takes about 1μs (typ) for the output to stabilize due to the startup time of the internal circuit. On the other hand, when switching between input signals (e.g. IN1 → IN3), it takes approximately 0.01μs to 0.11μs (typ) to switch.
Please refer to Technical Note p.9, section 9 of the "Cautions for Use" for more information. Since the output becomes unstable in the OPEN state, please connect to GND or VCC via a coupling capacitor.