The Si3232 is a low-voltage CMOS SLIC that offers a low-cost, fully softwareprogrammable, dual-channel, analog telephone interface for customer premise (CPE) applications. Internal ringing generation eliminates centralized ringers and ringing relays, and on-chip subscriber loop testing allows remote line card and loop diagnostics with no external test equipment or relays. The Si3232 performs all programmable SLIC functions in compliance with all relevant LSSGR, ITU, and ETSI specifications; all high-voltage functions are performed by the Si3200 linefeed interface IC. The Si3232 operates from a single 3.3 V supply and interfaces to a standard SPI bus digital interface for control. The Si3200 operates from a 3.3 V supply as well as high-voltage battery supplies up to 100 V. The Si3232 is available in a 64-pin thin quad flat package (TQFP), and the Si3200 is available in a thermally-enhanced 16-pin small-outline (SOIC) package.