KS8995XA B3 Micrel Inc, KS8995XA B3 Datasheet - Page 54

• Manufacturer Part Number: KS8995XA B3
• Manufacturer: Micrel Inc

Specifications of KS8995XA B3

• 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
• Lead Free Status / RoHS Status: Not Compliant

September 2008
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
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.)
Pulse
Bel Fuse
YCL
Transpower
Delta
LanKom
1.3dB can be compensated by increasing the line drive current by means of reducing the ISET resistor value.
Vendor
4-Port Integrated
H1164
558-5999-Q9
PH406466
HB826-2
LF8731
SQ-H48W
Part
MDIX
Auto
Yes
Yes
Yes
Yes
Yes
Yes
Value
1 CT : 1 CT
350µH
0.4µH
12pF
0.9Ω
1.0dB
1500Vrms
Table 12. Qualified Magnetics Lists
Number
of Ports
(1)
4
4
4
4
4
4
Pulse
Bel Fuse
YCL
Transpower
Delta
LanKom
Vendor
54
Single-Port
H1102
S558-5999-U7
PT163020
HB726
LF8505
LF-H41S
Test Condition
100mV, 100kHz, 8mA
1MHz (min.)
0MHz to 65MHz
Part
MDIX
Auto
Yes
Yes
Yes
Yes
Yes
Yes
Number
of Ports
M9999-091508
1
1
1
1
1
1