Practical Electronics/IC/4068

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.


 * $$ Q = \overline{A \cdot B \cdot C \cdot D \cdot E \cdot F \cdot G \cdot H } $$
 * $$ \overline{Q} = A \cdot B \cdot C \cdot D \cdot E \cdot F \cdot G \cdot H $$

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.