DM9000ISA to Ethernet MAC Controller with Integrated 10/100 PHYFinal 49Version: DM9000-DS-F02June 26, 200211.7 Magnetics Selection GuideRefer to Table 2 for transformer requirements.Transformers, meeting these requirements, areavailable from a variety of magnetic manufacturers.Designers should test and qualify all magnetics beforeusing them in an application. The transformers listedin Table 2 are electrical equivalents, but may not bepin-to-pin equivalents.Manufacturer Part NumberPulse Engineering PE-68515, H1078, H1012H1102Delta LF8200, LF8221xYCL 20PMT04, 20PMT05Halo TG22-3506ND, TD22-3506G1, TG22-S010NDTG22-S012NDNano Pulse Inc. NPI 6181-37, NPI 6120-30, NPI 6120-37NPI 6170-30Fil-Mag PT41715Bel Fuse S558-5999-01Valor ST6114, ST6118Macronics HS2123, HS2213Table 211.8 Crystal Selection GuideA crystal can be used to generate the 25MHzreference clock instead of a oscillator. The crystalmust be a fundamental type, and series-resonant.Connects to X1_25M and X2_25M, and shunts eachcrystal lead to ground with a 22pf capacitor (see figure6).21 22X1_25MX2_25MAGND AGNDC1822pfY1 25MC1922pfFigure 11-6Crystal Circuit Diagram
