7403: Quad 2-Input NAND Gate (Open-Collector Output)

All four positive-logic NAND gates may be used independently. On any one gate, with either input low, the output is driven to an open circuit. When both inputs are high, the output is low. An output-high state can be obtained only by adding an external resistor, usually 2.2K, from output to +5 volts.

The pinouts on the 7403 are identical to the logically similar 7400. The circuitry is identical to the 7401. Note that this is a NAND gate, not a NOR gate.

Pinout
Pin # Pin Assignment
1 Input 1A
2 Input 1B
3 Output 1
4 Input 2A
5 Input 2B
6 Output 2
7 Ground
8 Output 3
9 Input 3A
10 Input 3B
11 Output 4
12 Input 4A
13 Input 4B
14 Power (+5V)

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