DM9621 datasheet(60/66 Pages) DAVICOM

60 / 66 page

DM9621

USB2.0 to Fast Ethernet Controller

Preliminary

Version: DM9621 -14-DS-P02

February 23, 2011

10. Magnetic and Crystal Selection Guide

10.1 Magnetic Selection Guide

Refer to Table 1 for transformer requirements.

Transformers, meeting these requirements, are

available from a variety of magnetic manufacturers.

Designers should test and qualify all magnetic before

using them in an application. The transformers listed

in Table 1 are electrical equivalents, but may not be

pin-to-pin equivalents. Designers should test and

qualify all magnetic specifications before using them

in an application. RoHS regulations, please contact

with your magnetic vendor, this table only for you

reference

Manufacturer

Part Number

DELTA

LFE8505-DC , LFE8563-DC, LFE8583-DC

MAGCOM

HS9016, HS9024

Halo

TG110-S050N2, TG110-LC50N2

Bel Fuse

S558-5999-W2

Table 1

10.2 Crystal Selection Guide

A crystal can be used to generate the 25MHz

reference clock instead of an oscillator. The crystal

must be a fundamental type, and series-resonant.

Connects to pins X1 and X2, and shunts each crystal

lead to ground with a 15pf capacitor (see figure 10-1).

PARAMETER

SPEC

Type

Fundamental, series-resonant

Frequency

25.000 MHz +/- 30ppm

Equivalent Series Resistance

25 ohms max

Load Capacitance

22 pF typ.

Case Capacitance

7 pF max.

Power Dissipation

1mW max.

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