I am using 74hc4067 IC(Multiplexer 4:16) for the extend the gpio pins can i use that gpio pins same time or not? and any one suggest about the ic how it is used?
Page 2 of the DATASHEET tells us exactly how this device works. You will need 4 GPIO pins to control 16 output pins on the MUX.
So, as you can see, you have 4 'select' pins. These need to be toggled high or low to control the outputs. The enable pin (active low) is toggled to turn the outputs on/off.
The device works in binary, so the 4 select pins are your binary input (0-0-0-0 up to 1-1-1-1) and the channel selected is the decimal representative. So, if you wanted to select channel 5 for example, you know the binary for 5 is 0-1-0-1.
Next, you look down the table to find the output channel '5', you can see that working back from S3, the binary representative is 0-1-0-1.
That is all you need to know to use this device. You give it a binary number on the select pins and the corresponding output channel is selected. Follow the truth table down and you will see it.
If you want to switch from one number to another, it is a good idea to toggle the Enable pin high to disable the outputs, then select your channel before toggling the enable low to enable them again, this ensures that the MUX has fully switched over to the new output (I have been caught out by this before).