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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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T89C51SND1-ROTIL 데이터시트(PDF) 40 Page - ATMEL Corporation |
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T89C51SND1-ROTIL 데이터시트(HTML) 40 Page - ATMEL Corporation |
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40 / 60 page  40 T8xC51SND1 Rev. D – 15-Nov-01 Table 46. External 8-bit Bus Cycle - Data Write AC Timings VDD= 2.7 to 3.3 V, TA= -40 to +85 °C 12.4.3 Waveforms Figure 16. External 8-bit Bus Cycle - Data Read Waveforms Figure 17. External 8-bit Bus Cycle - Data Write Waveforms 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 TLLWL ALE Low to WR# Low 3·TCLCL-30 1.5·TCLCL-30 ns TWLWH WR# Pulse Width 6·TCLCL-25 3·TCLCL-25 ns TWHLH WR# High to ALE High TCLCL-20 TCLCL+20 0.5·TCLCL-20 0.5·TCLCL+20 ns T AVWL Address Valid to WR# Low 4·T CLCL-30 2·T CLCL-30 ns T QVWH Data Valid to WR# High 7·T CLCL-20 3.5·T CLCL-20 ns T WHQX Data Hold after WR# High T CLCL-15 0.5·T CLCL-15 ns T AVDV T LLAX T RHDX T RHDZ T AVLL TAVRL P2 P0 RD# ALE TLHLL TRLRH Data In A15:8 T RLAZ TLLRL TRHLH TRLDV D7:0 A7:0 |
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