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参数资料
| 型号： | DS21Q554 |
| 英文描述： | Quad T1/E1 Transceiver 5V |
| 中文描述： | 四路T1/E1收发器(3.3V, 5.0V) |
| 文件页数： | 12/13页 |
| 文件大小： | 163K |
| 代理商： | DS21Q554 |
DALLAS SEMICONDUCTOR DS21Q352/DS21Q552/DS21Q354/DS21Q554 Preliminary Data Sheet
December 29, 1998
12
POWER SUPPLY DE-COUPLING
In a typical PCB layout for the DS21x5y, all of the VDD pins will connect to a common power plane and all
the VSS lines will connect to a common ground plane. There are three recommended methods for de-
coupling shown below in both schematic and pictorial form. As shown in the pictorials, the capacitors
should be symmetrically located about the device. The first shown in figure 3 uses standard capacitors,
two 33uf tantalums, two .33uf ceramics and two .01uf ceramics. The second method shown in figure 4
uses a single 68uf tantalum, two .33uf ceramics and two .01uf ceramics. The third method shown in figure
5 uses only four capacitors, two 1.5uf MLC and two .01uf ceramics. The 1.5uf is an MLC (Multi Layer
Ceramic) type. The MLC construction is a low inductance type, which allows a smaller value of
capacitance to be used. 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 DS21Qx5y as possible and routed
vertically to power and ground planes.
De-coupling scheme using standard tantalum caps
. Figure 3
De-coupling scheme using single 68uf cap
. Figure 4
De-coupling scheme using MCL caps
. Figure 5
All capacitor values in figures 3, 4 and 5 are in uf.
33
.33
.01
33
.33
.01
VDD
VDD
DS21Qx5y
.01
.01
.33
.33
33
33
DS21Qx5y
.01
.01
VDD
VDD
DS21Qx5y
1.5
1.5
.01
.01
1.5
1.5
DS21Qx5y
.33
.01
.33
VDD
VDD
DS21Qx5y
68
.01
.01
.01
.33
.33
68
DS21Qx5y
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21Q554B | 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q554B+ | 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q554BN | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q554BN+ | 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q554BW | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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