External contact pad and output terminal configuration protecting device for low power integrated circuit, has shifting units with memory cell storing output state of specific function of respective level shift unit in rest mode of circuit

摘要

The device (1) has tension level shifting units (2, 2', 2'', 2'''), and a function state transferring part transferring function state into output based on state of control or data signal. Each unit has a memory cell supplied by supply voltage, where the cell stores output state of specific function of the respective level shift unit in low power integrated circuit rest mode, where regulated voltage of integrated circuit is interrupted. An output stage (3) has a tri-state buffer (4) receiving a voltage shifted data signal from one of the units in normal operating mode. An independent claim is also included for a method for activating an external contact pad and output terminal configuration protecting device.