参数资料
型号: KSZ8021RNL
厂商: Micrel Inc
文件页数: 36/43页
文件大小: 0K
描述: TXRX PHY 100BASE TX 3.3V 24QFN
标准包装: 75
类型: PHY 收发器
驱动器/接收器数: 1/1
规程: RMII
电源电压: 1.8V,2.5V,3.3V
安装类型: 表面贴装
封装/外壳: 24-VFQFN 裸露焊盘
供应商设备封装: 24-QFN 裸露焊盘(4x4)
包装: 管件
其它名称: 576-3740-5
Micrel, Inc.
KSZ8021RNL / KSZ8031RNL
August 2010
41
M9999-082710-1.0
Magnetics Specification
A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode chokes
is recommended for exceeding FCC requirements.
Tables 12 and 13 list recommended magnetic characteristics and qualified magnetics for the KSZ8021/31RNL.
Parameter
Value
Test Condition
Turns ratio
1 CT : 1 CT
Open-circuit inductance (min.)
350
μH
100mV, 100kHz, 8mA
Insertion loss (max.)
1.0dB
100kHz – 100MHz
HIPOT (min.)
1500Vrms
Table 12. Magnetics Selection Criteria
Magnetic Manufacturer
Part Number
Auto MDI-X
Number of Port
Bel Fuse
S558-5999-U7
Yes
1
Bel Fuse (Mag Jack)
SI-46001-F
Yes
1
Bel Fuse (Mag Jack)
SI-50170-F
Yes
1
Delta
LF8505
Yes
1
LANKom
LF-H41S-1
Yes
1
Pulse
H1102
Yes
1
Pulse (low cost)
H1260
Yes
1
Transpower
HB726
Yes
1
TDK (Mag Jack)
TLA-6T718A
Yes
1
Table 13. Qualified Single Port 10/100 Magnetics
Reference Clock – Connection and Selection
A crystal or external clock source, such as an oscillator, is used to provide the reference clock for the KSZ8021/31RNL.
For the KSZ8021/31RNL in RMII – 25MHz Clock Mode, the reference clock is 25MHz. The reference clock connections to
XI (Pin 8) and XO (Pin 7), and the reference clock selection criteria are provided in Figure 16 and Table 14.
Figure 16. 25MHz Crystal / Oscillator Reference Clock Connection
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