电阻电容的封装形式如何选择（How to choose the packing form of resistor and capacitor）.docVIP

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电阻电容的封装形式如何选择（How to choose the packing form of resistor and capacitor）.doc

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电阻电容的封装形式如何选择（How to choose the packing form of resistor and capacitor） [resistance] how to choose the form of resistor and capacitor, the author zwr009 date 2006-9-30 22:39:00 Zero How to package recommended 1. resistor capacitor selection, have what principle? For example, the same is 104 of the 0603 and 0805 capacitor package, is also 321608053528 10uF capacitor packaging, choose which package is right? Resistors and capacitors are commonly used in circuits I see: Capacitance： The possible packages for 0.01uF are 0603 and 0805 10uF packages are 3216, 3528, and 0805 100uF has 7343 320pF package: 0603 or 0805 Resistor: 4.7K, 10K, 330, and 33 have both 0603 and 0805 packages How do I choose these packages? 2. sometimes two chip pin (such as chip A chip B pin 1, pin 2) can be directly connected, sometimes between pins (such as A-1 and B-2) are to add a piece of resistance, such as 22 in Europe, this is why? What is the role of the resistance? How to choose the resistance? 3. how to arrange the lotus root capacitor? What are the principles? Is each power pin arranged with an 0.1uF? Sometimes, when you see 0.1uF and 10uF work together, why? 4. what does the so-called 5V TTL device and 5V CMOS device mean? Does it mean that the device power is connected to the 5V, and its pin output or input level is 5V TTL or 5V CMOS? 5. board to do two serial ports, can not only use a MAX232 chip? If you can, which model chips, MAX3232C, MAX3232E or MAX3232CSE, or that these chips, which can be? 6. look at the PDIUSBD12 chip manual, see two concepts, it is not clear: single address / data bus configuration, multi-channel address / data bus configuration, what is the difference between the two? In 7.protel99, is the network label of power and ground necessarily global (even though I use hierarchical circuits, schematics, drawing modes, 3: circuits, ports, global, network labels, local)? 8. crystal oscillator circuit capacitance seems to be generally 22pF, this is not the experience val