Hitachi, Ltd.

Masaru Osanai

Mitsuo Usami

Toshio Yamada

Hiroyuki Itoh

Akira Masaki

Masayoshi Yagyu

Tohru Kobayashi

Masato Hamamoto

An improved flip-flop circuit is provided which prevents the occurrence of soft errors due to .alpha. rays and the like emitted from a trace amount of radioactive materials contained in a semiconductor package material. The flip-flop circuit has a first logic circuit which holds data and produces a first logic signal and a second logic circuit which produces a second logic signal. A logic gate receives the first and second logic signals that are produced from the first and second logic circuits and which have the same logic level. The output of the logic gate is input to the first logic circuit through a feedback loop which is provided between the output and the input of the first logic circuit and which includes the logic gate. According to the circuit construction of the present invention, a flip-flop circuit can be accomplished which is resistant to the radioactive rays such as .alpha. rays and does not cause soft errors.

Flip-flop circuit

Growing community of inventors

Hachioji, Japan

Masaru Osanai