74HC139 Dual 2-to-4 Line Decoder/Demultiplexer
High-speed silicon-gate CMOS dual 2-to-4 line decoder/demultiplexer. Features active-low enable inputs and active-low decoded outputs. Ideal for memory address decoding.
Aliase:SN74HC139N, 74HCT139, Dual 2-4 Decoder
DIP-16 Top View
16 Pins
Pinout Table16
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | ~1E | Digital | Decoder 1 Enable (Active Low) |
| 2 | 1A0 | Digital | Decoder 1 Address Select A0 (LSB) |
| 3 | 1A1 | Digital | Decoder 1 Address Select A1 (MSB) |
| 4 | ~1Y0 | Digital | Decoder 1 Output 0 (Active Low) |
| 5 | ~1Y1 | Digital | Decoder 1 Output 1 (Active Low) |
| 6 | ~1Y2 | Digital | Decoder 1 Output 2 (Active Low) |
| 7 | ~1Y3 | Digital | Decoder 1 Output 3 (Active Low) |
| 8 | GND | Ground | System Ground (0V) |
| 9 | ~2Y3 | Digital | Decoder 2 Output 3 (Active Low) |
| 10 | ~2Y2 | Digital | Decoder 2 Output 2 (Active Low) |
| 11 | ~2Y1 | Digital | Decoder 2 Output 1 (Active Low) |
| 12 | ~2Y0 | Digital | Decoder 2 Output 0 (Active Low) |
| 13 | 2A1 | Digital | Decoder 2 Address Select A1 (MSB) |
| 14 | 2A0 | Digital | Decoder 2 Address Select A0 (LSB) |
| 15 | ~2E | Digital | Decoder 2 Enable (Active Low) |
| 16 | VCC | Power | Positive Supply Voltage (+2V to +6V) |