This article relies largely or entirely on a single source. (June 2009)
InterChip USB (IC-USB or sometimes referred to as USB-IC, Inter-chip USB, or High-Speed Inter-Chip (HSIC)) is an addendum to the USB Implementer Forum's USB 2.0 specification. IC-USB is intended as a low power variant of the standard physical USB interface, and is made possible by intending its use for direct chip to chip communications and by restricting the length of the IC-USB bus to no more than 10 cm in length. This results in a lower inductance and capacitance, and therefore lower power requirements.
IC-USB is being used primarily in embedded systems and standards. One of the most relevant areas of application is in mobile phones, where, for instance, ETSI (in specification TS 102 600) has standardized on IC-USB as the official high speed interface for connections between the phone's main chipset and the SIM card or UICC card.
The USB 3.0 successor of HSIC is called SuperSpeed Inter-Chip (SSIC).
The forum's Inter-Chip USB Supplement was released in March 2006. ETSI TS 102 600, which is ETSI's USB implementation requirements specification, was first released in December 2007.