KS8995MA Micrel Inc, KS8995MA Datasheet - Page 72

• Manufacturer Part Number: KS8995MA
• Description: IC SWITCH 10/100 5PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8995MA

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 5
• Internal Memory Buffer Size: 64
• 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 Temperature Classification: Commercial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1017 - BOARD EVAL EXPERIMENT KS8995M
• Lead Free Status / RoHS Status: Not Compliant, Lead free / RoHS Compliant

KS8995MA
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. The IEEE 802.3u standard for 100BASE-TX assumes a transformer loss of 0.5dB. For the transmit line transformer, insertion loss of up to 1.3dB
The following transformer vendors provide compatible magnetic parts for Micrel’s device:
M9999-051305
Characteristics Name
Turns Ratio
Open-Circuit Inductance (min.)
Leakage Inductance (max.)
Inter-Winding Capacitance (max.)
D.C. Resistance (max.)
Insertion Loss (max.)
Hipot (min.)
can be compensated by increasing the line drive current by means of reducing the I
Pulse
Bel Fuse
YCL
Transpower
Delta
LanKom
Vendor
4-Port Integrated Auto
H1164
558-5999-Q9
PH406466
HB826-2
LF8731
SQ-H48W
Part
Number
MDI-X
Yes
Yes
Yes
Yes
Yes
Yes
Table 24. Qualified Magnetics Vendors
Value
1 CT : 1 CT
350µH
0.4µH
12pF
0.9Ω
1.0dB
1500Vrms
(1)
of Port
4
4
4
4
4
4
72
Pulse
Bel Fuse
YCL
Transpower
Delta
LanKom
Single Port
Vendor
SET
Test Condition
100mV, 100kHz, 8mA
1MHz (min.)
0MHz to 65MHz
resistor value.
AutoNumber
H1102
S558-5999-U7
PT163020
LF8505
LF-H41S
HB726
Part
MDI-X
Yes
Yes
Yes
Yes
Yes
Yes
Micrel, Inc.
May 2005
of Port
1
1
1
1
1
1