KS8993F Micrel Inc, KS8993F Datasheet - Page 99

• Manufacturer Part Number: KS8993F
• Description: IC CONV MED 10/100 3PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8993F

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 32
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 1.89/3.465V
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: KS8993F-EVAL - EVAL KIT EXPERIMENTAL KS8993F
• Lead Free Status / RoHS Status: Not Compliant, Lead free / RoHS Compliant

7 Selection of Isolation Transformer
An 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode
choke is recommended for exceeding FCC requirements.
characteristics.
The following are recommended transformers for the KS8993F.
8 Selection of Crystal/Oscillator
A crystal or oscillator with the following typical characteristics is recommended.
Micrel, Inc.
June 2009
Parameter
Turns Ratio
Open-Circuit Inductance (min.)
Leakage Inductance (max.)
Inter-Winding Capacitance (max.)
D.C. Resistance (max.)
Insertion Loss (max.)
HIPOT (min.)
Charateristics
Frequency
Frequency Tolerance (max)
Load Capacitance (max)
Series Resistance
Magnetic Manufacturer
Pulse
Pulse (low cost)
Transpower
Bel Fuse
Delta
LanKom
Table 26: Crystal/Oscillator Selection Criteria
Table 24: Transformer Selection Criteria
Table 25: Qualified Single Port Magnetic
20
Value
25.00000
±50
25
Value
1 CT : 1 CT
350 uH
0.4 uH
12 pF
0.9 Ohms
1.0 dB
1500 Vrms
LF-H41S
Part Number
H1102
H1260
HB726
S558-5999-U7
LF8505
99
The following table gives recommended transformer
Units
MHz
ppm
pF
Ω
Test Condition
100 mV, 100 kHz, 8 mA
1 MHz (min.)
0-65 MHz
Auto MDI-X
[e-mail]
Yes
Yes
Yes
Yes
Yes
Yes
or [phone]
M9999-062509
KS8993F/FL