Bypass capacitor?

[ChArLyZzZ]

Hi guys,
As i know,we should always put a bypass capacitor between Vcc and GND in any application to eliminate noise from the supply.
But if i have several ICs on my board (PIC, EEPROM,D/A,etc..) and each one requires a bypass capacitor, should I put one for every IC(0.1 uF)?? or only one big capacitor for the whole application(1 uF)??
Thanks

 

[Thunderchild]

no one 0.1 uF per chip and make it as close as possible. perhaps soldering it to the underside of the pcb is a good idea then u can go ahead with ur designing without worying about them and just popo them on at the end. u could also insert then inside the socket but they must be low enough for the chip to be inserted. just remember as close as possible or u will defeat the object

 

[Nigel Goodwin]

As already suggested, you need a number of capacitors around the board, you might not need one for every chip, but it's probably easier to do so rather than try and finds ones you could leave out. As also suggested, place them as close to the chips as you can!.

A LOT depends on the types of chips in use, TTL are particularly bad in this respect, as are 555's (as Audioguru will tell you!). If you're using CMOS chips they are far more tolerant!.

 

[ChArLyZzZ]

yes they are CMOS in most, MAX232 is CMOS right??
Ok thanks guys 4 everything