Hitachi, Ltd.

Akio Koyama

Hiroki Yamashita

Yuji Yokoyama

Masahito Sonehara

Toshio Shinomiya

Atsushi Itoh

Tatsuhiro Aida

In a semiconductor integrated circuit device generating internal power from external power, an abnormal operation may occur due to an indefinite state of a control signal when the external power is applied and the internal power rises. The semiconductor integrated circuit includes an internal power generating circuit, a control circuit receiving internal power and supplying a first control signal, and a power-on reset circuit generating a reset signal at rising of the internal power. When internal power rises, the reset signal masks an indefinite state of the first control signal supplied from the control circuit.

Semiconductor integrated circuit device

The power supply-voltage dependency of a current source current is reduced and the power supply voltage is lowered. The invention includes an emitter-coupled logic circuitand a reference-voltage generating circuitfor generating a reference voltage VCSC for controlling a drain current (=current source current ICS) of a constant current-supplying n-type MOS transistorThe emitter-coupled logic circuitcomprises a current switch made up of a pair of emitter-coupled bipolar transistorsanda constant current-supplying n-type MOS transistorthat is connected in series with the current switch, and resistor meansandconnected in series with the bipolar transistorsandindividually for obtaining an output voltage. The reference-voltage generating circuitcomprises an n-type MOS transistora bipolar transistorwhich determines the drain voltage of the n-type MOS transistorand a control circuitfor controlling the drain current of the n-type MOS transistor

Logic circuit

Growing community of inventors

Kokubunji, Japan

Akio Koyama