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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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COM20019IP 데이터시트(PDF) 50 Page - SMSC Corporation |
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COM20019IP 데이터시트(HTML) 50 Page - SMSC Corporation |
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50 / 81 page  50 DISCONTINUED DATASHEET the Tentative ID Register and monitor the New Next ID bit to maintain an updated network map. OSCILLATOR The COM20019 contains circuitry which, in conjunction with an external parallel resonant crystal or TTL clock, forms an oscillator. If an external crystal is used, two capacitors are needed (one from each leg of the crystal to ground). No external resistor is required, since the COM20019 contains an internal resistor. The crystal must have an accuracy of 0.020% or better. The oscillation frequency range is from 10 MHz to 20 MHz. The crystal must have an accuracy of 0.010% or better when the internal clock multiplier is turned on. The oscillation frequency must be 20MHz when the internal clock multiplier is turned on. The XTAL2 side of the crystal may be loaded with a single 74HC-type buffer in order to generate a clock for other devices. The user may attach an external TTL clock, rather than a crystal, to the XTAL1 signal. In this case, a 390 pull-up resistor is required on XTAL1, while XTAL2 should be left unconnected. |
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