Texas Instruments
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3-to-8 line decoder/demultiplexer with active-low outputs. Chip-select generation and address decoding.
| Part number | 74HC138 |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Integrated Circuits › Multiplexers & Decoders |
| Package | DIP-16 |
| Pins | 16 |
74HC138 pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | A0 | input | Address bit 0 |
| 2 | A1 | input | Address bit 1 |
| 3 | A2 | input | Address bit 2 |
| 4 | E1 | input | Enable 1, active low |
| 5 | E2 | input | Enable 2, active low |
| 6 | E3 | input | Enable 3, active high |
| 7 | Y7 | output | Output 7, active low |
| 8 | GND | ground | Ground |
| 9 | Y6 | output | Output 6 |
| 10 | Y5 | output | Output 5 |
| 11 | Y4 | output | Output 4 |
| 12 | Y3 | output | Output 3 |
| 13 | Y2 | output | Output 2 |
| 14 | Y1 | output | Output 1 |
| 15 | Y0 | output | Output 0 |
| 16 | VCC | power | Supply |
Schematic symbol and footprint
Schematic symbol
Footprint: DIP-16 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.