Part Number: SN74AUP1G08
My customer is asking is there's any description in d/s or info about output pin Y(pin 4)'s sink current data ?
I had check with d/s, not sure if IOH mean for the output sink current or not , please kindly help to confirm.
If by "sink current" you mean the current that flows into the pin, then that is specified by IOL. See Understanding and Interpreting Standard-Logic Data Sheets.
What is the actual problem the customer is trying to solve? Trying to sink more current will increase the output voltage; in that case, it would be a better idea to use a logic family with stronger output drivers, i.e., SN74AUC1G08 or SN74LVC1G08.
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