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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C51CC03U-RDTIM датащи(PDF) 163 Page - ATMEL Corporation |
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AT89C51CC03U-RDTIM датащи(HTML) 163 Page - ATMEL Corporation |
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163 / 183 page  163 AT89C51CC03 4182B–CAN–09/03 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; V SS = 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 117, Table 120 and Table 123 give the description of each AC symbols. Table 118, Table 122 and Table 124 give for each range the AC parameter. Table 119, Table 122 and Table 125 give the frequency derating formula of the AC parameter for each speed range description. To calculate each AC symbols: Take the x value and use this value in the formula. Example: T LLIV and 20 MHz, Standard clock. x = 30 ns T = 50 ns T CCIV = 4T - x = 170 ns |
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