The SSTL_18 pad set is a full complement of I/O, power, and spacer cells that are necessary to assemble a padring by abutment. Since the SSTL_18 normally operates with its own isolated power domain (1.8V), a "rail-splitter" support cell (SPP_RS_005_18V) is included to allow the designer to easily break the lines that should not connect to the rest of the padring, while allowing VDD and VSS to be continuous within the padring. The output circuitry is designed with 2.5-volt FET's, but all parameters are guaranteed only at 1.8 volts (±10%). The cells are designed to provide the user with the option of either 60% or full drive that is fully compliant with the JEDEC standard JESD8-15a specification up to 400 MHz (DDR800) with balanced load management.
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