Si32185 single-channel ProSLIC subscriber line interface circuit (SLIC) devices deliver the lowest power consumption, highest level of programmability and lowest cost bill of materials in the industry. Available in a QFN40 package its unmatched power efficiency is achieved using patent-pending on-chip intelligent dc-dc controller, patented low-power ringing (LPR) and a very low-power on-hook mode. PCM/SPI and our three-wire integrated serial interface (ISI) options are supported.