參數(shù)資料
型號(hào): DS21FT42
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 145/145頁
文件大?。?/td> 466K
代理商: DS21FT42
DALLAS SEMICONDUCTOR
DS21FF42/DS21FT42
October 18, 1999
145
POWER SUPPLY DE-COUPLING
In a typical PCB layout for the MCM, all of the VDD pins will connect to a common power plane
and all the VSS lines will connect to a common ground plane. The recommended method for de-
coupling is shown below in both schematic and pictorial form. As shown in the pictorial, the
capacitors should be symmetrically located about the device. Figure 25-1 uses standard capacitors,
two .47 uf ceramics and two .01uf ceramics. Since VDD and VSS signals will typically pass
vertically to the power and ground planes of a PCB, the de-coupling caps must be placed as close to
the DS21Fx4y as possible and routed vertically to power and ground planes.
De-coupling scheme using standard tantalum caps
. Figure 25-1
.01
.01
VDD
VDD
DS21Fx4y
.47
.47
.01
.01
.47
.47
DS21Fx4y
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