Input Signal Amplitude of ZDBs | Cypress Semiconductor
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Input Signal Amplitude of ZDBs
How is the output affected when the input amplitude is greater than VCC?
Most devices have ESD protection diodes tied to VCC and GND. If the Input signal amplitude is greater than the VCC by approx 0.7V, the diode may forward bias causing the input signal to ripple through the VCC lines and causes output buffers to modulate and exhibit false deterministics jitter.