AM79C873 datasheet(40/44 Pages) AMD

40 / 44 page

Am79C873

PRELIMINARY

MAGNETICS SELECTION GUIDE

The NetPHY-1 device requires a 1:1 ratio for both the

receive and the transmit transformers. Refer to Table 2

for transformer requirements. Transformers meeting

these requirements are available from a variety of mag-

netic manufacturers. Designers should test and qualify

all magnetics before using them in an application. The

transformers listed in Table 2 are electrical equivalent,

but may not be pin-to-pin equivalent.

Table 2.

Transformer Requirements

CRYSTAL SELECTION GUIDE

A crystal can be used to generate the 25 MHz refer-

ence clock instead of a crystal oscillator. An M-TRON

crystal, part number is 00301-00169, MP-1 Fund, @

25.000000 MHz, ±50 ppm or equivalent may be used.

The crystal must be a fundamental type, parallel res-

onant. Connect to X1 and X2, shunt each crystal lead

to ground with an 18pf capacitor (see Figure 16).

Figure 16.

Crystal Circuit Diagram

Manufacturer

Part Number

Bel Fuse

S558-5999-01

Delta

LF8200, LF8221

HALO Electronics, Inc.

Single Port

TG22-3506ND, TD22-

3506G1, TG22-S010ND,

TG22-S012ND,

TG110-S050N2

Quad Port

TG110-6506NX, TG110-

S450NX, TG110-S452NX

Nano Pulse Inc.

NPI 6181-37, NPI 6120-30,

NPI 6120-37

NPI 6170-30

Pulse Engineering

PE-68517, PE-68515,

H1019, H1012 ----Single

Port

H1027, H1028 ---- Dual Port

PE-69037, H1001,

H1036, H1044 ---- Quad

Port

Valor

ST6114, ST6118

YCL

20PMT04, 20PMT05

OSC/XTLB

OSCGND

AGND

C18

18 pF

Y1 25M

C19

18 pF

22164A-18

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