Digital integrated circuit

摘要

A digital integrated circuit is provided with a maximum number of input and output terminals assigned for a normal operation mode and the number of terminals required for a function test is minimized. The integrated circuit is additionally provided with at least one control terminal, the functions of at least a part of the input and output terminals being determined in response to the logical level at the control terminal. Terminal utilization efficiency is further enhanced if the control terminal is connected to an inverter which is nonresponsive to the normal logic mode voltage range but which is responsive to a voltage outside the normal logic mode voltage range.