Inter-chip USB transceiver for mobile devices, M2M, PCs and USB token applications where an USB UICC is required. Fully compliant with the IC_USB1.0 standard for UICC, enabling one interface from many to support data transfers between the host and the USB UICC. An upstream-facing port may be connected to three different interfaces: digital (ASIC, FPGA), USB2.0 section 7 with or without cable, and IC_USB1.0. A downstream port complies with IC_USB1.0. Mode is selectable by three digital pins.A supply monitor, a 3.3V, 70mA linear voltage regulator for host, and a 1.8V/3.0V, 70mA linear voltage regulator for UICC, compliant with ETSI TS102 221 are also included.