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Parallel end-termination resistors (commonly 50 Ω ) to V TT = (V CCO /2) are typically placed on the board close to any receiver. Depending on the board topology, source-termination series resistors help match the output driver impedance to the transmission line and end-termination impedances, to reduce reflections and improve signal integrity. Optional untuned split input ODT provides Thevenin equivalent resistance of R (where R = Z 0 ) to the V CCO /2. The differential (DIFF_) versions use complementary single-ended drivers for outputs, and differential receivers for inputs.