參數(shù)資料
型號: MIC2551AYTS
廠商: Micrel Inc
文件頁數(shù): 11/11頁
文件大?。?/td> 0K
描述: IC USB TRANSCEIVER 14-TSSOP
標準包裝: 94
類型: USB 收發(fā)器
驅(qū)動器/接收器數(shù): 1/1
規(guī)程: USB 2.0
電源電壓: 4 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 14-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 14-TSSOP
包裝: 管件
產(chǎn)品目錄頁面: 1113 (CN2011-ZH PDF)
其它名稱: 576-2182
MIC2551AYTS-ND
November 2008
9
M9999-112008
MIC2551A
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 >2 widths 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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