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Microcontroller level translator not working

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S

sei

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I append my circuit and signal response as below. D15 was injected with 3.3V pulses from DSP (Blue). The output is in Red was from Spare4 line.

Q1) Why the ouput pulses does not settle to 0 Volt? Is my circuit correct?

Q2) Why the output pulses have ripples?

Is there a way to solve the problems? TQ.

 

Previously I came across such an issue with Logic conveters. Could not get rid off and used bus FET switches to do logic conversion.
 

The problem is, i have already fabricated my PCB with gold track. i thought the ADG3308 circuit should be straight forward just like any other 74 series.
 

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