Renesas Technology Corp.

Hitachi Ulsi Systems Co., Ltd.

Other

Renesas Electronics Corporation

Kazuhiro Matsushita

Kazuki Watanabe

Norihisa Yamamoto

Hisataka Tsunoda

Masaru Kubota

Yuki Matsuda

The present invention provides a semiconductor integrated circuit device and a non-contact type IC card and a portable information terminal which uses the semiconductor integrated circuit device. The semiconductor integrated circuit device includes antenna terminals LA, LB which are connected to an antenna L, a power source circuit Bwhich has a rectifier/smoothing circuit Bwhich obtains a DC voltage by rectifying and smoothing an AC signal which is supplied to the antenna terminal from the antenna and a shunt regulator Band a series regulator Bwhich stabilize the DC voltage, and an internal circuit Bwhich is operated upon the supply of the DC voltage from the power source circuit. The series regulator operates and the shunt regulator stops in a stage that a signal is transmitted to a reader/writer. The shunt regulator operates and the series regulator stops in a stage other than the stage that the signal is transmitted to the reader/writer.

Semiconductor integrated circuit device, and non-contact type IC card and portable information terminal using the semiconductor integrated circuit device

In an IC card in which an internal circuit is operated by an internal power supply formed from alternate current from outside received by an antenna, the voltage of the internal power supply sometimes changes due to the operation of the internal circuit. Therefore, the voltage controlling circuit of the present invention includes a voltage controlling current source, and when the internal circuit is not operated and the current higher than a predetermined current is detected in the voltage controlling current source, an operating current detector circuit outputs an enable signal. When the internal circuit is operated in response to the enable signal, the current consumed in the internal circuit is subtracted from the current passing through the voltage controlling current source. Consequently, the current change in the entire internal power supply can be prevented, and the output voltage of the internal power supply can be kept constant.

Semiconductor device and IC card

A nonvolatile memory device and a data processing system with a reduced layout area are capable of efficiently generating a high voltage without deteriorating the charge transfer efficiency of a charge pump circuit. The charge pump circuit in a nonvolatile memory device includes a plurality of stages of charge pump unit circuits. A voltage generating unit provides, as a control signal to the gate of a first MOS transistor for transferring charges from a first capacitor of a charge pump unit circuit of one stage to a first capacitor at the next stage, a fourth signal having an amplitude of a difference voltage between the power supply voltage and the charge pump voltage of the first capacitor at the one stage. The fourth control signal is obtained from second and third signals each changing in amplitude of the power supply voltage. The second signal is supplied via a second capacitor.

Generating high voltages in nonvolatile memory devices and data processing systems

Growing community of inventors

Kodaira, Japan

Kazuhiro Matsushita