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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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COM20019IP датащи(PDF) 70 Page - SMSC Corporation |
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COM20019IP датащи(HTML) 70 Page - SMSC Corporation |
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70 / 81 page  FIGURE 18 – BACKPLANE MODE TRANSMIT OR RECEIVE TIMING (These signals are to and from the differential driver or the cable) 70 DISCONTINUED DATASHEET t1 t3 Parameter Input Clock High Time Input Clock Period min 20 50 max units nS nS XTAL1 t1 t4 Input Clock Frequency* 100 t2 Input Clock Low Time nS t3 20 typ 10 t2 20 MHz t5 Frequency Accuracy* -200 200 ppm Note*: t4 and t5 are applied to crystal oscillaton. 4.0V 1.0V 50% of VDD FIGURE 19 – TTL INPUT TIMING ON XTAL1 PIN FIGURE 20 – RESET AND INTERRUPT TIMING t1 Parameter nRESET Pulse Width*** min max units t1 nRESET 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 312.5 Kbps, TDR = 3200 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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