英语翻译
ThePLCCandLCCCpackageshaveleadsarrangedonallfoursides.Pin1isindicatedbyadotorotherindexmarkandislocatedatthecenterofonesetofleads.Thepinnumberincreasegoingcounterclockwiseasviewedfromtheofthepackage.Thehighestpinnumberisalwaystotherightofpin1.Figure7-4(b)illustratesthisformatfora20-pinPLLCpackage.