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SN74LS273: In out signal has a serious delay in one of channels

Part Number: SN74LS273
Other Parts Discussed in Thread: SN74HCS273

Hi team,

My customer uses SN74LS273 and they found a serious issue.

They use the same CLK signal and input signal per channel. but one of the channels will appear serious delay. 

If they change to a new one will fix the issue. could you please give some suggestions? thanks