Hitachi, Ltd.

Hitachi Device Engineering Co., Ltd.

Ken'ichi Ohata

Goro Kitsukawa

Hiroaki Nambu

Masanori Odaka

Kazuo Kanetani

Noriyuki Homma

Hisayuki Higuchi

Kunihiko Yamaguchi

Youji Idei

Yoshiaki Sakurai

A circuit technique suitable to attain a high speed of a memory which is constructed in a manner such that memory cells include a field effect transistor and peripheral circuits include a bipolar transistor and a field effect transistor. According to the invention, a bipolar transistor whose collector is connected to a differential amplifier and which supplies a current to the differential amplifier in accordance with a signal which is inputted to a base or an emitter is added, and a bipolar transistor to supply a current only when writing to bit lines is connected. According to the invention, a high speed of the access time when information is read out by switching the selection bit line is accomplished. Further, the charge/discharge time of the bit line when information is written is reduced and a high speed of the writing time can be also accomplished. The improvement of the drivers of word lines and bit lines is also disclosed and a semiconductor memory which can operate at a high speed as a whole semiconductor memory can be realized.

Bit-line drive circuit for a semiconductor memory

Growing community of inventors

Kokubunji, Japan

Ken'ichi Ohata