Low power very large scale integrated (VLSI) designs using a circuit failure in sequential cells as low voltage check for limit of operation of a design are provided. One such method involves the adding a plurality of bits for sequential elements in the design including sets of flip-flops, RAMs, ROMs and register files to add parity or single error correct and double error detect mechanism, a method to detect the parity errors or a single bit error and a double bit error in the sequential elements, starting at a voltage of operation at a nominal value and gradually lowering voltage setting till a first error is detected in the sequential elements, increasing the voltage of operation by predetermined step above a voltage of first fail to achieve an optimal voltage setting of a correct operation of the design, storing this optimal voltage setting in anon-volatile memory for a subsequent use.