KS8721SL-EVAL Micrel Inc, KS8721SL-EVAL Datasheet - Page 20

• Manufacturer Part Number: KS8721SL-EVAL
• Description: BOARD EVAL EXPERIMENT KS8721SL
• Manufacturer: Micrel Inc

Specifications of KS8721SL-EVAL

• Main Purpose: Interface, Ethernet Controller (PHY and MAC)
• Embedded: No
• Utilized Ic / Part: KSZ8721SL
• Primary Attributes: 1 Port, 100BASE-TX/100BASE-FX/10BASE-T
• Secondary Attributes: MII, RMII, Auto MDI, MDIX, >130 Meter Cable Driver, LDO, IEEE802.3u Compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 576-1010

KS8721BL/SL (3.3V Single Power Supply 10/100BaseTX/FX MII Physical Layer Transceiver)
S
S
ELECTION OF
ELECTION OF
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.
Characteristics Name
Turns Ratio
Open-Circuit Inductance (min.)
Leakage Inductance (max.)
Inter-Winding Capacitance (max.)
D.C. Resistance (max.)
Insertion Loss (max.)
HIPOT (min.)
Note: The IEEE 802.3u standard for 100BaseTX assumes a transformer loss of
0.5 dB. For the transmit line transformer, insertion loss of up to 1.3 dB can be
compensated by increasing the line drive current by means of reducing the
REXT resistor value.
A crystal with the following typical characteristics is recommended.
Characteristics Name
Frequency
Frequency Tolerance (max.)
Load Capacitance (max.)
Series Resistance (max.)
I
R
SOLATION
EFERENCE
T
- 20 -
C
RANSFORMER
RYSTAL
Value
1 CT : 1 CT
350 uH
0.4 uH
12 pF
0.9 ohm
1.0 dB
1500 Vrms
Value
25.00000
+/- 100
20
25
KS8721BL/SL Preliminary Rev 0.90
Test Condition
100 mV, 100 KHz, 8 mA
1 MHz (min.)
0 – 65 MHz
Units
MHz
ppm
pF
ohm
Aug, 2003