Real Time Clocks What is SPI or Serial to Parallel Interface? The Serial Peripheral Interface Bus (SPI) is a synchronous serial data link standard that operates in full duplex mode. Devices communicate in master/slave mode where the master device initiates the data frame. Multiple slave devices are allowed with individual slave select (chip select) lines. The Microwire and MicrowirePLUS buses are a subsets of SPI. National offers many solutions with SPI interface including: Low power ADCs Low power DACs Digital Temperature Sensors Audio codec subsystems PLLatinum PLLs and Jitter Cleaners High-Speed Interface and SDI ICs Mobile Pixel Link (MPL) for small-format LCD displays DVGAs Where can I find a utility for converting IBIS models to SPICE? Intusoft offers a free IBIS to SPICE conversion utility. See their Modeling Utilities page, http://www.intusoft.com/utilities.htm.