US 2002/0163365 A1 · Semiconductor integrated circuit device with voltage interface circuit

Abstract

A semiconductor integrated circuit device of an embodiment of the present invention includes a voltage converting transistor, connected between a pad and an internal circuit, for converting an input voltage applied to the pad into a voltage that is lower than an operating voltage of the internal circuit, a first pull-up transistor connected between the operating voltage and the pad, a second pull-up transistor connected between the operating voltage and a junction node connecting the voltage converting transistor with the internal circuit, and a control circuit for controlling the first and second pull-up transistors so that the first and second pull-up transistors operate complementary to each other, according to a voltage on the pad when the pad is in a floating condition.

Claims35

Dependent claims

A semiconductor integrated circuit device comprising:

a voltage converting transistor, connected between a pad and an internal circuit, for converting an input voltage applied to the pad into a voltage that is lower than an operating voltage of the internal circuit;
a first pull-up transistor connected between the operating voltage and the pad;
a second pull-up transistor connected between the operating voltage and a junction node connecting the voltage converting transistor with the internal circuit;
and
a control circuit for controlling the first and second pull-up transistors so that the first and second pull-up transistors operate complementary to each other, according to a voltage on the pad when the pad is in a floating condition.

2 more elements

A semiconductor integrated circuit device comprising:

a first NMOS transistor having a first terminal connected to a pad, a second terminal connected to an internal circuit, and a gate connected to a power supply voltage used in the internal circuit;
a first PMOS transistor having a first terminal connected to the power supply voltage, a second terminal connected to the pad, and a gate connected to a first control signal;
a second PMOS transistor having a first terminal connected to the power supply voltage, a second terminal connected to the second terminal of the NMOS transistor, and a gate connected to a second control signal;
a voltage detection circuit for detecting whether a voltage on the pad is higher than the power supply voltage, and for generating a detection signal;
and
a control signal generating circuit for generating the first and second control in response to the detection signal, wherein the first and second control signals are activated so that the first and second control signals are complementary to each other.

3 more elements

Dependencies are inferred from the claim text.

Semiconductor integrated circuit device with voltage interface circuit

Life of this patent

Semiconductor integrated circuit device with voltage interface circuit

Life of this patent

Abstract

Claims35