KS8999 Micrel Inc, KS8999 Datasheet - Page 51

• Manufacturer Part Number: KS8999
• Description: IC SWITCH 10/100 9PORT 208PQFP
• Manufacturer: Micrel Inc

Specifications of KS8999

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 208-MQFP, 208-PQFP
• 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
• Mounting: Surface Mount
• Jtag Support: No
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: 576-1023 - BOARD EVAL EXPERIMENT FOR KS8999
• Lead Free Status / RoHS Status: Not Compliant, Contains lead / RoHS non-compliant

Selection of Isolation Transformer
One simple 1:1 isolation transformer is needed 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.
Note 1.
Selection of Reference Oscillator/Crystal
An oscillator or crystal with the following typical characteristics is recommended.
January 2005
KS8999
The following transformer vendors provide compatible magnetic parts for Micrel’s device:
Characteristics Name
Turns Ratio
Open-Circuit Inductance (min.)
Leakage Inductance (max.)
Inter-Winding Capacitance (max.)
D.C. Resistance (max.)
Insertion Loss (max.)
HIPOT (min.)
Characteristics Name
Frequency
Maximum Frequency Tolerance
Maximum Jitter
Vendor
Pulse
Bel Fuse
YCL
Transpower
Delta
The IEEE 802.3u standard for 100BaseTX assumes a transformer loss of 0.5dB. For the transmit line transformer, insertion loss of up to
1.3dB can be compensated by increasing the line drive current by means of reducing the ISET resistor value.
4-Port Integrated
Part
H1164
558-5999-Q9
PH406466
HB826-2
LF8731
Table 15. Qualified Magnetics Vendor Lists
Auto
MDIX
Yes
Yes
Yes
Yes
Yes
1.0dB
Value
1 CT : 1 CT
350 H
0.4 H
12pF
0.9
1500Vrms
Value
25.00000
150
50
(Note 1)
Number
of Port
4
4
4
4
4
51
Vendor
Pulse
Bel Fuse
YCL
Transpower
Delta
Single Port
Test Condition
100mV, 100 KHz, 8mA
1MHz (min.)
0MHz to 65MHz
Test Condition
MHz
ppm
ps(pk-pk)
Part
H1102
S558-5999-U7
PT163020
HB726
LF8505
Auto
MDIX
Yes
Yes
Yes
Yes
Yes
Number
of Port
1
1
1
1
1
KS8999
Micrel