A voltage regulator coupled to an unregulated DC input voltage source by an input terminal, and to a load by an output terminal is disclosed. Related methods are also described. Each of the master and slave determines from these words 22,32 separately whether communication is to continue from master to slave, from slave to master, both, or neither. The convert interface is sandwiched between the upper housing and the lower housing to convert signal formats between the Memory Stick Duo and the Micro-SD. Contact holes can be formed in interlayer layer above polycide. The solder extends from the pin pad beyond the circumferential edge of the shaft side plane of the enlarged diameter portion and spreads on the shaft side plane through wetting in such a manner as not to reach the shaft portion.