74139 Dual 2 to 4 Line Decoder
Pin Arrangement

Truth Table
| Inputs | Outputs | |||||
|---|---|---|---|---|---|---|
| EN | SEL | |||||
| G' | B | A | Y0 | Y1 | Y2 | Y3 |
| H L L L L |
X L L H H |
X L H L H |
H L H H H |
H H L H H |
H H H L H |
H H H H L |
Electrical Characteristics
| Input | Output | N | LS | ALS | ALS 1000 | F | S | AS | AS 1000 | HC | HCT | Unit [Max] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Enable | Y0 - Y7 | - | 32 | 8 | - | 8 | 10 | 5.5 | - | 44 | - | nS |
| Select | - | 38 | 10 | - | 9 | 12 | 6 | - | 55 | - | nS |
| N | LS | ALS | ALS 1000 | F | S | AS | AS 1000 | Unit | ||
|---|---|---|---|---|---|---|---|---|---|---|
| All Inputs | High | - | 20 | 20 | - | 20 | 50 | 20 | - | uA |
| Low | - | 0.36 | 0.1 | - | 0.6 | 2 | 0.5 | - | mA |
| N | LS | ALS | ALS 1000 | F | S | AS | AS 1000 | HC | HCT | Unit | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| All Outputs | High | - | 0.4 | 0.4 | - | 1 | 1 | 2 | - | 4 | - | mA |
| Low | - | 8 | 8 | - | 20 | 20 | 20 | - | 4 | - | mA |
Reference

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