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AT87F51-24JI Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT87F51-24JI Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 15 page Not 10 AC Characteristics (Under Operating Conditions; Load Capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; Load Capacitance for all other outputs = 80 pF) External Program and Data Memory Characteristics Symbol Parameter 12 MHz Oscillator Variable Oscillator Units Min Max Min Max 1/tCLCL Oscillator Frequency 0 24 MHz tLHLL ALE Pulse Width 127 2tCLCL-40 ns tAVLL Address Valid to ALE Low 43 tCLCL-13 ns tLLAX Address Hold After ALE Low 48 tCLCL-20 ns tLLIV ALE Low to Valid Instruction In 233 4tCLCL-65 ns tLLPL ALE Low to PSEN Low 43 tCLCL-13 ns tPLPH PSEN Pulse Width 205 3tCLCL-20 ns tPLIV PSEN Low to Valid Instruction In 145 3tCLCL-45 ns tPXIX Input Instruction Hold After PSEN 00 ns tPXIZ Input Instruction Float After PSEN 59 tCLCL-10 ns tPXAV PSEN to Address Valid 75 tCLCL-8 ns tAVIV Address to Valid Instruction In 312 5tCLCL-55 ns tPLAZ PSEN Low to Address Float 10 10 ns tRLRH RD Pulse Width 400 6tCLCL-100 ns tWLWH WR Pulse Width 400 6tCLCL-100 ns tRLDV RD Low to Valid Data In 252 5tCLCL-90 ns tRHDX Data Hold After RD 00 ns tRHDZ Data Float After RD 97 2tCLCL-28 ns tLLDV ALE Low to Valid Data In 517 8tCLCL-150 ns tAVDV Address to Valid Data In 585 9tCLCL-165 ns tLLWL ALE Low to RD or WR Low 200 300 3tCLCL-50 3tCLCL+50 ns tAVWL Address to RD or WR Low 203 4tCLCL-75 ns tQVWX Data Valid to WR Transition 23 tCLCL-20 ns tQVWH Data Valid to WR High 433 7tCLCL-120 ns tWHQX Data Hold After WR 33 tCLCL-20 ns tRLAZ RD Low to Address Float 0 0 ns tWHLH RD or WR High to ALE High 43 123 tCLCL-20 tCLCL+25 ns |
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