Vcc design for IC solution

VCC、VDD和VSS三种标号的区别在电子电路中，常可以看到VCC、VDD和VSS三种不同的符号，它们有什么区别呢？一、解释VCC：C=circuit 表示电路的意思, 即接入电路的电压； VDD：D=device 表示器件的意思,即器件内部的工作电压；VSS：S=series 表示公共连接的意思，通常指电路公共接地端电压。

二、说明1、对于数字电路来说，VCC是电路的供电电压,VDD是芯片的工作电压（通常Vcc>Vdd），VSS是接地点。

2、有些IC既有VDD引脚又有VCC引脚，说明这种器件自身带有电压转换功能。

3、在场效应管（或COMS器件）中，VDD为漏极，VSS为源极，VDD和VSS指的是元件引脚，而不表示供电电压。

GND:公共地DGND:数字地AGND:模拟地SGND:信号地1.OrCAD中拖动元件时如何不连线一起拖动？在原理图中画好了线路图，我想把其中的一个元件拖出来，但是拖动的过程中元件连着线一起拖动了，我不想那样，应该怎么做呢按住ALT键后，拖动元件2.如何复制元件?按住ctrl后拖动3. 在做new part时总出现下面地问题，如何解决?Warning: A pin with the name “GND”ist duplicated on the part!!EPart里面的GND重复了，你把GND管脚都改成Power类型的就可以了,或者说选择带有POWER 类型的库3. Occurrences和Instances有什么区别Occurrences和Instances有什么区别,用在什么情况下.简单的说，一般的原理图都用instances就可以了；( F1 B; [* B( H% M, \如果是阶层式设计，而且单一原理图会被多个block引用的话，就要使用occ了(如果只是调用库里面的元件，不管用了几个，用了几次，都用ins如果有阶层式电路图的引用，才考虑occ)4. ORCAD有没全局命令请问一下，ORCAD有没全局编缉命令。

33
用what-if分析来改善设计
Original VRM pins After turn the VRM 180 degree around (Done inside PowerDC GUI)
34
5. Package中的直流分析
35
GND平面上的IR Drop分布
Hotspots
36
发现大的过孔电流
R=V/I。
σ为材料的电导率，铜的电导率为 5.8 x 107 S/m
12
电流密度

自由电荷在导体中流动形成传导电流，其密度为 导电媒质中的恒流电场的基本方程为


电源/地平面上的电流密度是矢量分布，而平面上的标 量电流是没有物理意义的
13
PowerDC的主要功能



9
PowerDC的算法及理论基础
PowerDC基于电磁场理论求出电源/地平面上的电压
分布、电流密度的矢量分布，过孔电流和电阻。
全新的FEM仿真引擎在仿真精度和效率上有了很大的
提升。其精细的三角形网格剖分比其他工具采用的矩 形网格在计算结果和显示精度上要先进很多，另外特 有的快速算法使工具即使在仿真大型PCB时也仅需数 分钟的时间。
27
电源走线宽度计算器
28
4. PCB中的直流分析
29
电源平面
30
结果
9
31
过孔电流
Hotspot identifier
大量电流通过黄色过孔，贯穿2个 电源平面的重叠部分。
32
发现第11层上的高电流密度
高电流密度
显示电流密度在 5mA/mil^2 及以上的部分；小于该指标的以灰色来显示。

DATASHEET12-Ch a n n e l1:2M UX/DE M UX IC9642 Revision V0.1COPYRIGHT©2020 Shenzhen IcSpring Technology Co., Ltd all rights reserved. No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any means without the written permission of Shenzhen IcSpring Technology Co., Ltd.DISCLAIMERIcSpring Technology Co. Ltd provides this document “as is”, without warranty of any kind, neither expressed nor implied, including, but not limited to, the particular purpose. IcSpring Technology Co. reserves the right to make changes at any time without notice to improve and supply the best possible product and is not responsible and does not assume any liability for misapplication or use outside the limits specified in this document. This document could include technical inaccuracies or typographical errors.TRADEMARKSIcSpring is a trademark, of Shenzhen IcSpring Technology Co., Ltd. Other names mentioned in this document trademarks/registered trademarks of their respective owners.USING THIS DOCUMENTThis document is intended for the hardware and software engineer’s general information on the IcSpring IC9642 12-Channel 1:2 MUX/DEMUX IC.Though every effort has been made to ensure that this document is current and accurate, more information may have become available subsequent to the production of this guide. In that event, please contact your IcSpring representative for additional information that may help in the development process.REVISION HISTORYTable of Contents1. Introduction (4)1.1 Description (4)2. Features (5)2.1 General System Features (5)2.2 Applications (5)3. Pin Assignment (6)3.1 Pin Assignment Diagram (6)3.2 Pin Descriptions (7)4. System Architecture and Reference Design (9)4.1 Functional Block Diagram (9)4.2 Device Functional Modes (9)4.3 HDMI Application Schematic (10)5. Electrical Characteristics (11)5.1 Absolute Maximum Ratings (11)5.2 DC Characteristics (11)5.3 Switching Characteristics (12)5.4 HDMI Eye Pattern (12)6. Mechanical Information (13)7. Application Circuits (14)7.1 Circuit (15)7.2 Layout Guidelines (15)7.3 Layout Example (16)1.Introduction1.1 DescriptionThe IC9642 is a 12 channel 1:2 or 2:1 bidirectional multiplexer/demultiplexer. The IC9642 operates 3.3V and offers low resistance to achieve a typical bandwidth of up to 6.9 GHz. The device provides the high bandwidth necessary for HDMI 2.0 applications. The IC9642 offers a power down mode to operate minimal power consumption.2.Features2.1. General System Features• 2:1 multiplexer• 1:2 demultiplexer• VCC: 3.3V• I/O: 0 ~ 5V• Support HDMI 2.0 up to 4K 60Hz• ESD Performance– 2KV Human Body Model• 42-pin WQFN Package (9 mm x 3.5 mm, 0.5 mm pitch)2.2 Applications• General Purpose DVI 1.0•DisplayPort•TMDS•LVDS•High-Speed•HDMI Signal Switching3. Pin Assignment3.1 Pin AssignmentFigure 3.1 Pin Assignment Diagram3.2 Pin Descriptions4. System Functional Descriptions 4.1 Functional Block DiagramFigure 4.1IC9642 Block Diagram4.2 Device Functional ModesFigure 4.2 Functional Table4.3 HDMI Application Schematic5. Electrical Characteristics5.1 Absolute Maximum RatingsTable 5.1. Absolute Maximum Ratings5.2 DC CharacteristicsTable 5.2 General DC Characteristics6. Mechanical InformationFigure 6.1 Mechanical Information Diagram。

Integrated Silicon Solution, Inc. – Rev.A, 11/22/2011
3
芯天下--/
IS31AP4991
ABSOLUTE MAXIMUM RATINGS (Notes 1) Supply voltage, VDD Voltage at any input pin Junction temperature, TJMAX Storage temperature range, Tstg Operating temperature ratings Thermal resistance, θJA(SOP-8) θJA(MSOP-8) Power dissipation (Note 2) -0.3V ~ +6.0V -0.3V ~ VDD+0.3V -40°C ~ +150°C -65°C ~ +150°C −40°C ~ +85°C 58°C/W 160°C/W Internally Limited
APPLICATIONS TYPICAL APPLICATION CIRCUIT
Rfeed 20kΩ Cfeed Vcc
Mobile phones PDAs Portable electronic devices Notebook computer
+
Vcc Cin 0.22uF Rin 20kΩ VinVin+
1 2 3 4 5 6 7 8
Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances