ELANsat Tech EM78P156N Network Card User Manual


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EM78P156N
OTP ROM
Table 9 The Summary of Maximum Operating Speeds
Conditions VDD Fxt max.(MHz)
3.0 8.0
Two cycles with two clocks
5.0 20.0
2. Crystal Oscillator/Ceramic Resonators (XTAL)
EM78P156N can be driven by an external clock signal through the OSCI pin as shown in Fig. 11 below.
OSCI
OSCO
EM78P156N
Ext. Clock
Fig. 11 Circuit for External Clock Input
In the most applications, pin OSCI and pin OSCO can 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 8 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
EM78P156N
C1
C2
XTAL
RS
Fig. 12 Circuit for Crystal/Resonator
This specification is subject to change without prior notice. 27 07.29.2004 (V1.2)
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