Semiconductor device having a first stage input unit to which a potential is supplied from external and internal power supplies

Abstract

A power supply for supplying a power supply potential to a first stage input buffer circuit of a semiconductor device is changed according to the types of first stage input circuits. For example, an external power supply potential is supplied without change in a value from an external power supply to a first stage input buffer circuit to which a signal which activates a circuit provided in the subsequent stage only by transition from an "H" level to an "L" level such as an RAS signal. Thus, reduction in power consumption can be achieved. A stable internal power supply potential obtained by down-converting an external power supply potential is supplied from an internal power supply to a first stage input circuit to which a signal which activates a circuit provided in the subsequent stage by any one of transitions from an "L" level to an "H" level and from an "H" level to an "L" level. Thus, output information can be stabilized.

Dependencies are inferred from the claim text.