Level shifters

017_cell : Level shifters

Minimum Required Versions: AccuCell 2.6.0.R, SmartSpice 4.6.2.R

This example explains the characterization and modeling options for level shift up and level shift down cells using the embedded SmartSpice SPICE engine to perform characterization.

The following additional .cfg file commands are used when characterizing level shifter cells:

PIN_RAIL2RAIL specifies pins that operate with inputs other than the output supply voltage

SUPPLIES specifies additional power supply voltages other than the global core power. It may be used for either input OR output circuitry in the level shifter. The global core voltage set with SUPPLY_V_HIGH can also be used for either output OR input circuitry in the level shifter.

Some level shifter cells, such as shiftup , may also require the use of a .tbl table vector file defined with TBL_FILE_NAME.

While the cells in these examples are simple inverter functions, level shifter cells may take the form of ANY cell type including sequentials.