Continue to Site

# What is the delay of a xor gate ?

Status
Not open for further replies.

#### 2M

##### Newbie level 5
whats the delay of a xor gate ?

stupid question ?!!

stu ans:
The delay is due to the fact that information can travel at most, the speed of light, and in reality, the time it takes to do the computation is not infinitely quick

### 2M

Points: 2
Re: stupid question ?!!

The delay of any gate is caused by its parasite capacities. You can calculate delay on two ways. You can connect two gates of same type in serial or you can connect some capacity on the output. It has nothing to do with signal traveling speed. The thing is that you have some parasite capacity in your transistors, which need some time to charge or discharge...

### 2M

Points: 2
Re: stupid question ?!!

U can find XOR gate delay by connecting them as a ring inverter with one input of all XOR gate at logic '1'....and other input connected to output of previous gate and so on....better to have 13 or 15 gates to get accurate time (all odd number)....

Γp=time_period of output waveform/(2N)....where N is the number of gates....

### 2M

Points: 2
Re: stupid question ?!!

if you are using discreet xor gate IC' then the delay time will be available in datasheets... can find them easily in net...

### 2M

Points: 2
stupid question ?!!

depends on the chip family HC HCT AC F ect. on the site of fairchild you can find a table with the speeds.

### 2M

Points: 2
Re: stupid question ?!!

A) The delay can be sized by the transistor .

### 2M

Points: 2
stupid question ?!!

dependinmg upon hardware. varies gate to gate. go through data sheet of the IC.

Points: 2