Abstract: A semiconductor device comprises an output circuit 31 for flowing out a source current IH or flowing in a sink current IL depending on an input signal AO and an output enable signal OE, a source current auxiliary circuit 32, and a sink current auxiliary circuit 33. The circuit 32 comprises a capacitor C1 connected so that the capacitor C1 can be charged through a transistor SW1 and a resistor R1, and a transfer gate T1 connected between a higher-potential-side electrode of the capacitor C1 and the output 16 the device. The sink current auxiliary circuit 33 comprises a capacitor C2 connected so that the capacitor C2 can discharge through a resistor R2 and a transistor SW2, and a transfer gate T2 connected between a higher-potential-side electrode of the capacitor C2 and the output 16 of the device.

Abstract: A semiconductor integrated circuit device with a copy-preventive function comprises a memory for storing data to be used by users, an input unit for performing various logical operations on at least one input information fed externally and accessing the memory, an output unit for performing various logical operations on the data at the time of supplying the data from the memory, a judging unit for comparing at least one of the state of the input information, the logical state of the input unit, the logical state of the output unit, and the state of data provided by the output unit with specific judgment information and indicating the result of comparison, and a control unit that when the result indicated by the judging unit reveals that the at least one of the states is consistent with a specific state, acts at least on the output unit so as to prevent data stored in the memory from being supplied normally.

Abstract: An object of the present invention is to improve the output speed of a data signal output circuit having a latch circuit when the supply voltage is low. The data signal output circuit according to the present invention includes a latch circuit; an output circuit; a latch control circuit; an output control circuit; and a supply voltage decrease detection circuit. The latch circuit latches and holds a data signal according to a latch signal output from the latch control circuit. By setting the latch signal to one of two logical states, the latch circuit changes to a through state directly outputting an input data signal. The output circuit changes between a state for outputting a data signal from the latch circuit and a high-impedance state according to an output control signal output from the output control circuit. The supply voltage decrease detection circuit detects whether or not the supply voltage is less than a pre-determined value.