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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89C51AC3-RDTUM 데이터시트(PDF) 124 Page - ATMEL Corporation |
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AT89C51AC3-RDTUM 데이터시트(HTML) 124 Page - ATMEL Corporation |
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124 / 140 page  124 AT89C51AC3 4383D–8051–02/08 AC Parameters Explanation of the AC Symbols Each timing symbol has 5 characters. The first character is always a “T” (stands for time). The other characters, depending on their positions, stand for the name of a signal or the logical status of that signal. The following is a list of all the characters and what they stand for. Example: TAVLL = Time for Address Valid to ALE Low. TLLPL = Time for ALE Low to PSEN Low. TA = -40°C to +85°C; VSS = 0V; VCC = 3V to 5.5V; F = 0 to 40 MHz. (Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other outputs = 60 pF.) Table 73, Table 76 and Table 79 give the description of each AC symbols. Table 74, Table 78 and Table 80 give for each range the AC parameter. Table 75, Table 78 and Table 81 give the frequency derating formula of the AC parame- ter for each speed range description. To calculate each AC symbols: Take the x value and use this value in the formula. Example: TLLIV and 20 MHz, Standard clock. x = 30 ns T = 50 ns TCCIV = 4T - x = 170 ns |
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