Practical Electronics/IC/4068
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4068 | |
---|---|
Logic Type | Combinatorial |
Function Family | Logic |
Description | 8-Input NAND/AND Gate |
Pins | 14 |
Pinout | |
Functional Diagram | |
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.