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output voltage drop of 555 timer ic

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mozikluv

New Member
:D hi,

i have another question about the famous 555 timer, is the output voltage of pin 3 always about 2v lower than the supply voltage?

thanx :D
 

laroche73

New Member
555 output

The 555 uses a bipolar totem-pole output. If you want rail-to-rail output swings, you might try using the CMOS version, the 7555 or mc1455. The CMOS version has a much lower drive capability, though. The output only swings close to the supply rails if you're driving one or two TTL loads.
 

mozikluv

New Member
bipolar totem pole circuit

:D hi laroche 73,

thanx for your informative reply, would you care to show the circuit of this bipolars, how they are connected and how they are used?

thanx :D
 

laroche73

New Member
555 output stage

This link shows the internals of the 555, along with the theory of operation and a fairly detailed description of each pins' operation. (Q20 - Q24 make up the output stage).

**broken link removed**
 

mozikluv

New Member
555 innards

:D hi laroche 73,

thanx, thats the thing i have been looking :D :D :D
 
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