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Placing Decoupling Capacitor for PCB

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skyglin

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I'm using circuitmaker 2000 to do PCB layout for one of my circuit, and I'm having trouble placing decoupling capacitors (for each IC) on my schematic because IC chips don't show the power and gnd pins in schematic. Has anyone encoutered similiar problems?

skyglin
 

Just tie them to gnd and power that you will be using for the IC.

Some schematic programs allow modification of the symbol for the ic.
See if yours allows that. Then just make the power pins visible or add them.

When placing on PCB place as close as possible to power input lead.
 

skyglin, it is not necessary you connect the caps directly to the pins of the ic's.
It's enough you decide the number of caps and simply connect them on the schematics to Vcc and Gnd.
As you place components, put the caps as close as possible to each ic, and route manually the traces, or verify after routing that the traces are correctly placed.

Nox
 

I agree with NOX. Many schematic design software don't display the power pins but they have them connected appropriately. In Circuit Maker there is an option that defines which pins are used to power the IC and which one is the Vcc or the GND.
As NOX said, you only need to put caps on your circuit's supply lines(Vcc and GND) and then place them in the PCB manually next to each IC.
Have in mind that almost all schematic design softwares use simillar representation for the IC power pins and even if they display the pins, whatever is connected next to them does not means that it is places next to them when you switch to the PCB design. You have to place most of the components manually if you want good results. (This is what I am doing all the time - I use PROTEL DXP).
 

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