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KS8993M Datasheet(PDF) 84 Page - Micrel Semiconductor

Part No. KS8993M
Description  Integrated 3-Port 10/100 Managed Integrated 3-Port 10/100 Managed
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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KS8993M Datasheet(HTML) 84 Page - Micrel Semiconductor

 
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Micrel, Inc.
KS8993M/ML/MI
April 2005
84
M9999-041205
Selection of Isolation Transformers
A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode
choke is recommended for exceeding FCC requirements.
The following table gives recommended transformer characteristics.
Parameter
Value
Test Condition
Turns ratio
1 CT : 1 CT
Open-circuit inductance (min.)
350
µH
100mV, 100kHz, 8mA
Leakage inductance (max.)
0.4
µH
1MHz (min.)
Inter-winding capacitance (max.)
12pF
D.C. resistance (max.)
0.9
Insertion loss (max.)
1.0dB
0MHz – 65MHz
HIPOT (min.)
1500Vrms
Table 27. Transformer Selection Criteria
Magnetic Manufacturer
Part Number
Auto MDI-X
Number of Port
Bel Fuse
S558-5999-U7
Yes
1
Bel Fuse
SI-46001
Yes
1
Bel Fuse
SI-50170
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
Pulse
H1102
Yes
1
Pulse (low cost)
H1260
Yes
1
Transpower
HB726
Yes
1
YCL
LF-H41S
Yes
1
Table 28. Qualified Single Port Magnetics
Selection of Reference Crystal
Chacteristics
Value
Units
Frequency
25.00000
MHz
Frequency tolerance (max)
±50
ppm
Load capacitance (max)
20
pF
Series resistance
25
Table 29. Typical Reference Crystal Characteristics


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