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Ron (ON Resistance)

RON is the ON resistance of the switch. Remember that the NMOS and PMOS transistors are in-parallel. This means when the switch is on, add the two resistances in-parallel, making a lower combined resistance. The relationship of VCC and threshold voltage (VTH) impacts the linearity of the signal through the switch. For example, the 74LVC2G3157 has a strong RON peak for low VCC. However, in devices with an internal charge pump like the CB3Q3257, the RON curve follows that of the NMOS device. The charge pump keeps the gate voltage higher so that the switch can pass signals that are even higher than VCC.

PTM Published on: 2021-11-05