参数资料
型号: ICS1893BKLFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 10/133页
文件大小: 0K
描述: PHYCEIVER LOW PWR 3.3V 56-VQFN
标准包装: 1,000
系列: PHYceiver™
类型: PHY 收发器
规程: MII
电源电压: 3.14 V ~ 3.47 V
安装类型: 表面贴装
封装/外壳: 56-VFQFN 裸露焊盘
供应商设备封装: 56-VFQFP-EP(8x8)
包装: 带卷 (TR)
其它名称: 1893BKLFT
Chapter 9 DC and AC Operating Conditions
ICS1893BF, Rev. F, 5/13/10
May, 2010
107
ICS1893BF Data Sheet Rev. F - Release
Copyright 2009, IDT, Inc.
All rights reserved.
9.3 Recommended Component Values
There are two IEEE Std. 802.3 requirements that drive the tolerance for the frequency of the oscillator.
Clause 22.2.2.1 requires the MII TX_CLK to have an accuracy of ± 100 ppm.
Clause 24.2.3.4 is more stringent. It requires the code-bit timer to have an accuracy of 0.005% (that is, ±50 ppm).
Figure 9-1. ICS1893BF 10TCSR and 100TCSR
Table 9-3. Recommended Component Values for ICS1893BF
Parameter
Minimum
Typical
Maximum
Tolerance
Units
Oscillator Frequency
25
± 50 ppm
MHz
10TCSR Resistor Value
2.00k
1%
100TCSR Resistor Value
–1%
LED Resistor Value
510
1k
10k
Note:
1. The bias resistor networks set the 10baseT and 100baseTX output amplitude levels.
2. Amplitude is directly related to current sourced out of the 10TCSR and 100TCSR pins.
3. Resistor values shown above are typical. User should check amplitudes and adjust for transformer.
4. The VDD connection to the 12.1K resistor can connect to any VDD. The 12.1K resistor provides
negative feedback to compensate for VDD changes. Lowering the 12.1K value will lower the
100baseT amplitude.
5. The ICS1893BF 10baseT amplitude is below the IEEE spec but is adequate for 200m operation. This
is the effect of additional MUXes added for the Auto-MDIX function.
Typical Board Layouts
10TCSR and 100TCSR Bias Resistors
ICS1893BF
18
19
20
VDD
10TCSR
100TCSR
2.0K
1%
VDD
12.1 K
1%
10TCSR
1.54K
1%
100TCSR
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