Level-down shifter for interface circuit, has circuit unit driven by power and linked to output of another circuit unit, where former unit receives output of third circuit unit

摘要

#CMT# #/CMT# The shifter has four circuit units (222, 224, 226, 228), where one unit is driven by a power and receives an output of a power circuit. The unit (224) is driven by another power and receives the output of the circuit. The third unit is driven by the latter power and receives the output. The fourth unit is driven by the latter power and receives output of the third unit. The fourth unit is linked to an output of the unit (224). #CMT# : #/CMT# An independent claim is also included for an interface circuit comprising a level-down shifter. #CMT#USE : #/CMT# Used for an interface circuit that is utilized in a mobile product. #CMT#ADVANTAGE : #/CMT# The arrangement of the level-down shifter provides an output signal such that the amount of time required for transitions to logic high level and logic low level are balanced and are output without minimized skew. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows an interface circuit. 210 : External power circuit unit 221, 225 : Path circuits 222, 224, 226, 228 : Circuit units 230 : Internal power circuit unit.