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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT83SND1CXXX-ROTIL 데이터시트(PDF) 186 Page - ATMEL Corporation |
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AT83SND1CXXX-ROTIL 데이터시트(HTML) 186 Page - ATMEL Corporation |
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186 / 212 page  186 4109J–8051–10/06 AT8xC51SND1C 22.3 AC Characteristics 22.3.1 External Program Bus Cycles 22.3.1.1 Definition of Symbols Table 150. External Program Bus Cycles Timing Symbol Definitions 22.3.1.2 Timings Test conditions: capacitive load on all pins= 50 pF. Table 151. External Program Bus Cycle - Read AC Timings V DD = 2.7 to 3.3 V, TA = -40 to +85°C Signals Conditions A Address H High I Instruction In L Low LALE V Valid PPSEN X No Longer Valid ZFloating Symbol Parameter Variable Clock Standard Mode Variable Clock X2 Mode Unit Min Max Min Max T CLCL Clock Period 50 50 ns T LHLL ALE Pulse Width 2·T CLCL-15 T CLCL-15 ns T AVLL Address Valid to ALE Low T CLCL-20 0.5·T CLCL-20 ns T LLAX Address hold after ALE Low T CLCL-20 0.5·T CLCL-20 ns T LLIV ALE Low to Valid Instruction 4·T CLCL-35 2·T CLCL-35 ns T PLPH PSEN Pulse Width 3·T CLCL-25 1.5·T CLCL-25 ns T PLIV PSEN Low to Valid Instruction 3·T CLCL-35 1.5·T CLCL-35 ns T PXIX Instruction Hold After PSEN High 0 0 ns T PXIZ Instruction Float After PSEN High T CLCL-10 0.5·T CLCL-10 ns T AVIV Address Valid to Valid Instruction 5·T CLCL-35 2.5·T CLCL-35 ns T PLAZ PSEN Low to Address Float 10 10 ns |
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