AM79C873 Advanced Micro Devices, AM79C873 Datasheet - Page 40

• Manufacturer Part Number: AM79C873
• Description: NetPHY -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support
• Manufacturer: Advanced Micro Devices

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.
40
Bel Fuse
Delta
HALO Electronics, Inc.
Nano Pulse Inc.
Pulse Engineering
Valor
YCL
Manufacturer
Table 2. Transformer Requirements
S558-5999-01
LF8200, LF8221
Single Port
TG22-3506ND, TD22-
3506G1, TG22-S010ND,
TG22-S012ND,
TG110-S050N2
Quad Port
TG110-6506NX, TG110-
S450NX, TG110-S452NX
NPI 6181-37, NPI 6120-30,
NPI 6120-37
NPI 6170-30
PE-68517, PE-68515,
H1019, H1012 ----Single
Port
H1027, H1028 ---- Dual Port
PE-69037, H1001,
H1036, H1044 ---- Quad
Port
ST6114, ST6118
20PMT04, 20PMT05
Part Number
P R E L I M I N A R Y
Am79C873
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
AGND
Y1 25M
18 pF
C18
OSC/XTLB
OSCGND
AGND
18 pF
C19
32
31
AGND
22164A-18