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LAN8710A-EZC 데이터시트(PDF) 77 Page - SMSC Corporation |
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LAN8710A-EZC 데이터시트(HTML) 77 Page - SMSC Corporation |
77 / 82 page Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet SMSC LAN8710A/LAN8710Ai 77 Revision 1.4 (08-23-12) DATASHEET 5.6 Clock Circuit The device can accept either a 25MHz crystal or a 25MHz single-ended clock oscillator (±50ppm) input. If the single-ended clock oscillator method is implemented, XTAL2 should be left unconnected and XTAL1/CLKIN should be driven with a nominal 0-3.3V clock signal. See Table 5.13 for the recommended crystal specifications. Note 5.20 The maximum allowable values for Frequency Tolerance and Frequency Stability are application dependant. Since any particular application must meet the IEEE ±50 PPM Total PPM Budget, the combination of these two values must be approximately ±45 PPM (allowing for aging). Note 5.21 Frequency Deviation Over Time is also referred to as Aging. Note 5.22 The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as ±100 PPM. Note 5.23 0oC for extended commercial version, -40oC for industrial version. Note 5.24 This number includes the pad, the bond wire and the lead frame. PCB capacitance is not included in this value. The XTAL1/CLKIN pin, XTAL2 pin and PCB capacitance values are required to accurately calculate the value of the two external load capacitors. The total load capacitance must be equivalent to what the crystal expects to see in the circuit so that the crystal oscillator will operate at 25.000 MHz. Table 5.13 Crystal Specifications PARAMETER SYMBOL MIN NOM MAX UNITS NOTES Crystal Cut AT, typ Crystal Oscillation Mode Fundamental Mode Crystal Calibration Mode Parallel Resonant Mode Frequency Ffund - 25.000 - MHz Frequency Tolerance @ 25oCFtol - - ±50 PPM Note 5.20 Frequency Stability Over Temp Ftemp - - ±50 PPM Note 5.20 Frequency Deviation Over Time Fage - +/-3 to 5 - PPM Note 5.21 Total Allowable PPM Budget - - ±50 PPM Note 5.22 Shunt Capacitance CO -7 typ- pF Load Capacitance CL - 20 typ - pF Drive Level PW 300 - - uW Equivalent Series Resistance R1 -- 30 Ohm Operating Temperature Range Note 5.23 -+85 oC XTAL1/CLKIN Pin Capacitance - 3 typ - pF Note 5.24 XTAL2 Pin Capacitance - 3 typ - pF Note 5.24 |
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