MM74HC4066 Datasheet http://datasheet.emcelettronica.com/fairchild/M... The MM74HC4066 devices are digitally controlled analog switches utilizing advanced silicon-gate CMOS technology. These switches have low "ON" resistance and low "OFF" leakages. They are bidirectional switches, thus any analog input may be used as an output and visa-versa. Also the MM74HC4066 switches contain linearization circuitry which lowers the "ON" resistance and increases switch linearity.
