INTEGRATED CIRCUIT DEVICE, SEMICONDUCTOR MEMORY DEVICE AND OPERATING METHOD OF THEIR DEVICES

PROBLEM TO BE SOLVED: To provide an integrated circuit device and a semiconductor memory device and a method of operating the devices. SOLUTION: The integrated circuit device includes first and second chips and a common input/output pad electrically connected to the first and the second chips. At least one chip out of the first and the second chips receives an input voltage through the common input/output pad and includes a high voltage generator that generates a test voltage in response to test mode signals between test operating modes. The test voltage is higher than the input voltage. In addition, the method of operating the integrated circuit device and a semiconductor memory device is provided. This allows the system to prevent other memory chips mounted on the integrated circuit device from being damaged by the high voltage inputted through the common pad. COPYRIGHT: (C)2006,JPO&NCIPI