Abstract: In a semiconductor integrated circuit device, a digitally operating control circuit has a high-frequency circuit, which handles signals of relatively high frequencies, and a low-frequency circuit, which handles signals of relatively low frequencies. The high-frequency and low-frequency circuits are arranged as separate blocks. A plurality of conductor layers are provided, and, the wiring of the low-frequency circuit is achieved without using particular one or ones of those conductor layers.

Abstract: A semiconductor integrated circuit device 1 for use in a disk drive has a temperature detection section 9 that detects the temperature inside the semiconductor integrated circuit device 1 to switch a signal TSD between high and low levels when a predetermined temperature is reached, and a delay circuit 11 that receives this signal TSD and a clock from a control section 10 to output signals TSD1 and TSD2.

Abstract: A semiconductor integrated circuit device has a data reproduction circuit for reproducing data read by a head from a magnetic disk during a read operation, a data output circuit for outputting reproduced data obtained as an output of the data reproduction circuit to an external circuit, and an erase current control circuit for controlling an erase current supplied to the head during an erase operation. During an erase operation, the data reproduction circuit is kept deactivated. During transition from an erase operation to a read operation, the data reproduction circuit is activated after the erase current is turned off, and thereafter the data output circuit is activated.