The 74hc20 is a 4-input dual and non-gate chip. The non-gate uses a micro-cmos process, that is, 3.5-micron silicon gate P-well CMOS, to achieve the same operating speed as the sttI gate and the low power consumption of standard cmos integrated circuits. The device has high anti-interference and the ability to drive up to 10 LSttl loads. All inputs are protected with an internal diode clamp to Ⅴcc and ground.