Practical Electronics/IC/4068

4068 Combinatorial Logic 8-Input NAND/AND Gate 14 The 4068 is a member of the 4000 Series CMOS range, and contains a single 8-input NAND gate, and, on some models the inverted output (i.e. an AND gate). The pinout diagram, given on the right, is the standard eight-input CMOS logic gate IC layout: Pin 7 is the ground supply (GND) Pin 14 is the positive supply (VDD) Pins 2-5 and 9-12 are gate inputs for the gate Pin 1 and 13 are gate outputs. Pin 1 is not always available. Pin 6 and 8 are not connected. The NAND gate gives a high output for any combination of inputs, except when all inputs are high. The AND gate only gives a high when all inputs are high. This chip is widely available, and usually comes in a DIL-14 or SOIC-14 package. An 8-input NAND gate is available as the TTL 7430, but no AND gate is available.