The CD4066B device is a quad bilateral switch intended for the transmission or
multiplexing of analog or digital signals. It is pin-for-pin compatible with the CD4016B device,
but exhibits a much lower on-state resistance. In addition, the on-state resistance is relatively
constant over the full signal-input range.
The CD4066B device consists of four bilateral switches, each with independent controls.
Both the p and the n devices in a given switch are biased on or off simultaneously by the control
signal. As shown in Figure 17, the well of the n-channel device on each
switch is tied to either the input (when the switch is on) or to VSS (when
the switch is off). This configuration eliminates the variation of the switch-transistor threshold
voltage with input signal and, thus, keeps the on-state resistance low over the full
The advantages over single-channel switches include peak input-signal voltage swings
equal to the full supply voltage and more constant on-state impedance over the input-signal range.
However, for sample-and-hold applications, the CD4016B device is recommended.
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