KSZ8842-PMBLAM MICREL [Micrel Semiconductor], KSZ8842-PMBLAM Datasheet - Page 114

• Manufacturer Part Number: KSZ8842-PMBLAM
• Description: 2-Port Ethernet Switch with PCI Interface
• Manufacturer: MICREL [Micrel Semiconductor]

Micrel, Inc.
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 18 gives recommended transformer characteristics.
Selection of Reference Crystal
October 2007
Parameter
Turns ratio
Open-circuit inductance (min)
Leakage inductance (max)
Inter-winding capacitance (max)
D.C. resistance (max)
Insertion loss (max)
HIPOT (min)
Frequency
Frequency tolerance (max)
Load capacitance (max)
Series resistance
Magnetic Manufacturer
Pulse
Pulse (low cost)
Transpower
Bel Fuse
Delta
LanKom
TDK (Mag Jack)
Characteristics
Table 20. Typical Reference Crystal Characteristics
Table 19. Qualified Single Port Magnetics
Table 18. Transformer Selection Criteria
Part Number
H1102
H1260
HB726
S558-5999-U7
LF8505
LF-H41S
TLA-6T718
114
1 CT : 1 CT
1500Vrms
350µH
0.4µH
1.0dB
12pF
0.9Ω
Value
Auto MDI-X
Value
±50
25
20
25
Yes
Yes
Yes
Yes
Yes
Yes
Yes
100mV, 100kHz, 8mA
0MHz – 65MHz
Test Condition
1MHz (min)
Number of Port
MHz
ppm
Units
pF
1
1
1
1
1
1
1
Ω
KSZ8842-PMQL/PMBL
M9999-100207-1.5