The present invention provides a monitor, especially a wake up monitor, for monitoring an integrated circuit, the monitor comprising a first monitoring unit configured to monitor at least one input of the integrated circuit, a second monitoring unit configured to monitor at least one output of the integrated circuit, a measurement unit configured to measure the time elapsed between an event on the at least one input and a reaction to the event on the at least one output and configured to output an alert signal if the elapsed time exceeds a predetermined first time limit. The present invention furthermore discloses an integrated circuit and a method for monitoring an integrated circuit.