CMOS voltage swing problem

[gstekboy]

I modelled an XOR gate using HSPICE (Transistor level).Input voltage signal is 4V and Vdd of the circuit is 5V (threshold voltage= 1v).
While giving input voltage 4v I got Maximum output voltage swing as 5v, So my problem is I cant cascade the output of this XOR gate(5v) with another XOR gate beacause it will turn off cascaded transistors.

How to overcome the problem?

 

[crutschow]

Output swing is 5V.
How will that turn off cascaded transistors?

 

[gstekboy]

Output swing is 5V.
How will that turn off cascaded transistors?

When gate voltage of PMOS 5v and Source voltage (Vdd) of PMOS 5v,the transistor will be in cut off.

 

[Audioguru]

Don't you want the Pmos to turn on and off?
When its gate and source are both +5V then it is off. When the source is still +5V but its gate is 0V then it is turned on. What is the problem?