74LS30 8-input NAND gate
The 74LS30 is a single 8-input NAND gate. Its output is low only when all eight inputs are high. Pins 9, 10 and 13 are not connected.
74LS30 pinout
Top view of the 14-pin DIP package. Pin 1 is at the bottom left, beside the notch, and the numbers run anticlockwise. Power is on pin 14 (VCC, +5 V) and pin 7 (GND).
| Pin | Name | Type | What it is |
|---|---|---|---|
| 1 | A | Input | Input |
| 2 | B | Input | Input |
| 3 | C | Input | Input |
| 4 | D | Input | Input |
| 5 | E | Input | Input |
| 6 | F | Input | Input |
| 7 | GND | Ground | 0 V |
| 8 | Y | Output | Totem-pole output |
| 9 | NC | — | Not connected |
| 10 | NC | — | Not connected |
| 11 | G | Input | Input |
| 12 | H | Input | Input |
| 13 | NC | — | Not connected |
| 14 | VCC | Power | +5 V supply |
74LS30 truth table
With 8 inputs the full table has 256 rows. In short: the output is 0 only when every input is 1, and 1 otherwise.
What the 74LS30 is used for
- Combining up to eight minterms from a 74LS138 decoder into one function
- Detecting that every bit of a byte is 1
Electrical summary
| Package | 14-pin DIP |
| Supply voltage | 5 V (4.75 V to 5.25 V) |
| Supply current, typical | 0.5 mA |
| Output type | Totem-pole — drives both high and low |
| Output current, low | sinks up to 8 mA |
| Output current, high | sources up to 0.4 mA |
| Input current, low | 0.4 mA out of each input held low |
| Fan-out | one output can drive about 20 LS inputs |
Typical figures for quick reference when planning a board. Check the manufacturer's datasheet for limits and timing before committing a design. The 74HC30 and 74HCT30 use the same pin numbers, with different electrical values.
Try the 74LS30 on a breadboard
The Breadboard Simulator has the 74LS30 in its parts library: seat it on a virtual breadboard, wire it, power the board and probe the pins before you build the real thing.