According to the datasheet of 74HC02 IC (quad 2-input NOR gate), ICC = 1 * 10^6 A, tpLH = 8 ns, tpHL = 13 ns, VOH = 5.9 V, VOL = 0.1 V, VIH = 4.2 V, VIL = 1.8 V for a single NOR gate.
2. The maximum average propagation delay of a single gate.
3. Speed power product.
4. The HIGH-state noise margin.
5. The LOW-state noise margin.