cmos

[naik_mc]

i would like to know what will happen when the output of a basic CMOS inverter is connected to the ground

 

[kchriste]

Depends on the inverter. 74HC04? 74HCT04? 4049?
Nothing will happen if the input is tied high.

 

[Papabravo]

I think you already know the answer. With the input low the output will try to source current into the grounded output. The chip may get quite warm and fail.

 

[audioguru]

It depends on the output current from the type of Cmos IC.
A CD4069 inverter has a typical current into a short of only 4ma when its supply is 5V. Its output transistors can dissipate a max power of 100mW so the 20mW in this case is safe. When the supply is 10V then the typical current into a short is 20mA so the resulting 200mW power dissipation might fry its output transistor.

74HCxx high-speed Cmos ICs have a max allowed output of 25mA but will try to feed 60mA into a short then will fry.