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AT89C55WD Folha de dados(PDF) 27 Page - ATMEL Corporation |
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AT89C55WD Folha de dados(HTML) 27 Page - ATMEL Corporation |
27 / 35 page 27 1921C–MICRO–3/05 AT89C55WD 28. AC Characteristics Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other outputs = 80 pF. 28.1 External Program and Data Memory Characteristics Symbol Parameter 12 MHz Oscillator Variable Oscillator Units Min Max Min Max 1/t CLCL Oscillator Frequency 0 33 MHz tLHLL ALE Pulse Width 127 2tCLCL-40 ns t AVLL Address Valid to ALE Low 43 t CLCL-25 ns t LLAX Address Hold After ALE Low 48 t CLCL-25 ns tLLIV ALE Low to Valid Instruction In 233 4tCLCL-65 ns t LLPL ALE Low to PSEN Low 43 t CLCL-25 ns t PLPH PSEN Pulse Width 205 3t CLCL-45 ns tPLIV PSEN Low to Valid Instruction In 145 3tCLCL-60 ns t PXIX Input Instruction Hold After PSEN 00 ns t PXIZ Input Instruction Float After PSEN 59 t CLCL-25 ns tPXAV PSEN to Address Valid 75 tCLCL-8 ns t AVIV Address to Valid Instruction In 312 5t CLCL-80 ns t PLAZ PSEN Low to Address Float 10 10 ns tRLRH RD Pulse Width 400 6tCLCL-100 ns t WLWH WR Pulse Width 400 6t CLCL-100 ns t RLDV RD Low to Valid Data In 252 5t CLCL-90 ns tRHDX Data Hold After RD 00 ns t RHDZ Data Float After RD 97 2t CLCL-28 ns t LLDV ALE Low to Valid Data In 517 8t CLCL-150 ns tAVDV Address to Valid Data In 585 9tCLCL-165 ns t LLWL ALE Low to RD or WR Low 200 300 3t CLCL-50 3t CLCL+50 ns t AVWL Address to RD or WR Low 203 4t CLCL-75 ns tQVWX Data Valid to WR Transition 23 tCLCL-30 ns t QVWH Data Valid to WR High 433 7t CLCL-130 ns t WHQX Data Hold After WR 33 t CLCL-25 ns tRLAZ RD Low to Address Float 0 0 ns t WHLH RD or WR High to ALE High 43 123 t CLCL-25 t CLCL+25 ns |
Nº de peça semelhante - AT89C55WD_05 |
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Descrição semelhante - AT89C55WD_05 |
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