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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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COM20020D датащи(PDF) 64 Page - SMSC Corporation |
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COM20020D датащи(HTML) 64 Page - SMSC Corporation |
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64 / 72 page  64 FIGURE 21 – TTL INPUT TIMING ON XTAL1 PIN FIGURE 22 – RESET AND INTERRUPT TIMING t1 t3 Parameter Input Clock High Time Input Clock Period min 10 25 max units nS nS XTAL1 t1 t4 Input Clock Frequency 100 t2 Input Clock Low Time nS t3 10 typ 10 t2 40 MHz t5 Frequency Accuracy* -200 200 ppm Note*: Input clock frequency must be 20 MHz ( 100ppm or better) to use the internal Clock Multiplier. + - t5 is applied to crystal oscillaton. 4.0V 1.0V 50% of VDD t1 Parameter nRESET Pulse Width*** min max units nRESET t1 t2 nINTR High to Next nINTR Low typ t2 nINTR 5TXTL* EF = 0 EF = 1 TDR**/2 4TXTL* Note*: TXTL is period of external XTAL oscillation frequency. Note**: TDR is period of Data Rate (i.e. at 2.5 Mbps, TDR = 400 nS) Note***: When the power is turned on, t1 is measured from stable XTAL oscillation after VDD was over 4.5V. |
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