参数资料
型号: MIC2550ABML TR
厂商: Micrel Inc
文件页数: 11/11页
文件大小: 0K
描述: IC USB TRANSCEIVER 16-MLF
标准包装: 5,000
类型: USB 收发器
驱动器/接收器数: 1/1
规程: USB 2.0
电源电压: 4 V ~ 5.25 V
安装类型: 表面贴装
封装/外壳: 16-VQFN Exposed Pad,16-MLF?
供应商设备封装: 16-MLF?(4x4)
包装: 带卷 (TR)
其它名称: MIC2550ABMLTR
MIC2550ABMLTR-ND
March 2005
9
M9999-031805
MIC2550A
Micrel, Inc.
PCB Layout Recommendations
Although the USB standard and applications are not based in
an impedance controlled environment, a properly designed
PCB layout is recommended for optimal transceiver perfor-
mance. The suggested PCB layout hints are as follows:
Match signal line traces (VP/VM, D+, D–) to
40ps, approximately 1/
3 inch if possible. FR-4
PCB material propagation is about 150ps/inch,
so to minimize skew try to keep VP/VM, D+/D–
traces as short as possible.
For every signal line trace width (w), separate
the signal lines by 1.5–2 widths. Place all other
traces at >2w from all signal line traces.
Maintain the same number of vias on each
differential trace, keeping traces approximately
at same separation distance along the line.
Control signal line impedances to ±10%.
Keep R
S as close to the IC as possible, with
equal distance between R
S and the IC for both
D+ and D–.
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