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EM78P447NAM Datasheet(PDF) 25 Page - ELAN Microelectronics Corp |
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EM78P447NAM Datasheet(HTML) 25 Page - ELAN Microelectronics Corp |
25 / 57 page ![]() EM78P447N OTP ROM Table 8 The Summary of Maximum Operating Speeds Conditions VDD Fxt max.(MHz) 2.3 4.0 3.0 8.0 Two cycles with two clocks 5.0 20.0 2. Crystal Oscillator/Ceramic Resonators(XTAL) EM78P447N can be driven by an external clock signal through the OSCI pin as shown in Fig. 10 below. In most applications, Pin OSCI and Pin OSCO can be connected with a crystal or ceramic resonator to generate oscillation. Fig. 12 depicts such circuit. The same thing applies whether it is in the HXT mode or in the LXT mode. Table 9 provides the recommended values of C1 and C2. Since each resonator has its own attribute, user should refer to its specification for appropriate values of C1 and C2. RS. A serial resistor may be necessary for AT strip cut crystal or low frequency mode. OSCI OSCO EM 78P447S Ext. Clock Fig. 10 Crystal/Resonator Circuit OSCI OSCO EM 78P447S C1 C2 XTAL RS Fig. 11 Crystal/Resonator Circuit This specification is subject to change without prior notice. 10.21.2004 (V1.0) 25 |
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