KSZ8852HLE Datasheet, PDF (188/190 Pages) Micrel Semiconductor – Two-Port 10/100 Mb/s Ethernet Switch with 8 or 16-Bit Host Interface

Micrel, Inc.
KSZ8852HLE
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.
Table 33 gives recommended transformer characteristics.
Table 33. Transformer Selection Criteria
Parameter
Value
Test Condition
Turns ratio
1 CT : 1 CT
Open−circuit inductance (maximum)
350µH
100mV, 100kHz, 8mA
Leakage inductance (maximum)
0.4µH
1MHz (min)
Inter−winding capacitance (maximum)
12pF
D.C. resistance (maximum)
0.9Ω
Insertion loss (maximum)
HIPOT (maximum)
−1.0dB
1500Vrms
100kHz – 100MHz
Table 34. Qualified Single Port Magnetic
Magnetic Manufacturer
Pulse
Pulse (low cost)
Transpower
Bel Fuse
Delta
LanKom
TDK (Mag Jack)
Part Number
H1102NL
H1260
HB726
S558−5999−U7
LF8505
LF−H41S
TLA−6T718
Auto MDI−X
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Number of Port
1
1
1
1
1
1
1
August 31, 2015
188
Revision 1.1