KS8993F A5 Micrel Inc, KS8993F A5 Datasheet - Page 98

• Manufacturer Part Number: KS8993F A5
• Manufacturer: Micrel Inc

Specifications of KS8993F A5

• 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: Not Compliant

KS8993F
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.
August 26, 2004
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 25: Qualified Single Port Magnetic
Table 24: Transformer Selection Criteria
Value
20
25.00000
±50
25
Value
1 CT : 1 CT
350 uH
0.4 uH
12 pF
0.9 Ohms
1.0 dB
1500 Vrms
Part Number
H1260
LF8505
H1102
HB726
S558-5999-U7
LF-H41S
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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
Yes
Yes
Yes
Yes
Yes
Yes
Revision 1.0
Micrel