參數(shù)資料
型號(hào): KSZ8721CL TR
廠商: Micrel Inc
文件頁(yè)數(shù): 25/32頁(yè)
文件大?。?/td> 0K
描述: TXRX 10/100 3.3V 48-LQFP
標(biāo)準(zhǔn)包裝: 1,000
類(lèi)型: 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù): 1/1
規(guī)程: MII
電源電壓: 3 V ~ 3.6 V
安裝類(lèi)型: 表面貼裝
封裝/外殼: 48-LQFP
供應(yīng)商設(shè)備封裝: 48-LQFP(7x7)
包裝: 帶卷 (TR)
其它名稱(chēng): KSZ8721CLTR
KSZ8721CLTR-ND
October 2004
31
M9999-100804
KS8721CL
Micrel
Single Port
Number
Magnetic Manufacturer
Part Number
Auto-MDI-X
of Ports
Pulse
H1102
Yes
1
Bel Fuse
S558-5999-U7
Yes
1
YCL
PH163112
Yes
1
Transpower
HB726
Yes
1
Delta
LF8505
Yes
1
LanKom
LF-H41S
Yes
1
Table 8. Qualified Transformer List
Selection of Isolation Transformer(1)
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.
Characteristic
Value
Test Condition
Turns Ratio
1 CT : 1 CT
Open-Circuit Inductance (min.)
350H
100mV, 100kHz, 8mA
Leakage Inductance (max.)
0.4H
1MHz (min.)
Inter-Winding Capacitance (max.)
12pF
D.C. Resistance (max.)
0.9
Insertion Loss (max.)
1.0dB
0MHz to 65MHz
HIPOT (min.)
1500Vrms
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 can
be compensated or by increasing the line drive current by means of reducing the ISET resistor value. Please select the transformer that supports
auto-MDI/MDI-X.
Selection of Reference Crystal
An oscillator or crystal with the following typical characteristics is recommended.
Characteristic
Value
Units
Frequency
25.00000
MHz
Frequency Tolerance (max.)
±100
ppm
Load Capacitance (max.)
20
pF
Series Resistance (max.)
40
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