74LS155 Dual 2 To 4 Line Demultiplexer
Package PDIP, SOIC Series 74LS
74LS155 overview
The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS155 monolithic transistor-transistor-logic (TTL) circuits feature dual 1-line-to-4-line demultiplexers with individual strobes and common binary-address inputs in a single 16-pin package.
Key specifications
Supply Voltage
4.75 - 5.25Vdc
Maximum Clock Frequency
40Mhz
Power Dissipation
2mW/gate @100kHz
Minimum Output Current
8mA
Propagation Delay
10nS
Fan Out (TTL Loads)
20
Datasheet
155.pdf
74LS155 features
- Contains Two Demultiplexers To Convert Serial Data to Parallel Output
- Input Clamping Diodes
- Low Power
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS155 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | Ea | Enable Input Pin a |
| 2 | Ea | Enable Input Pin a |
| 3 | A1 | Data Input Pin of A1 |
| 4 | O3a | Output Bit 3 of a |
| 5 | O2a | Output Bit 2 of a |
| 6 | O1a | Output Bit 1 of a |
| 7 | O0a | Output Bit 0 of a |
| 8 | GND | Ground Pin |
| 9 | O0b | Output Bit 0 of b |
| 10 | O1b | Output Bit 1 of b |
| 11 | O2b | Output Bit 2 of b |
| 12 | O3b | Output Bit 3 of b |
| 13 | A0 | Data Input Pin of A0 |
| 14 | Eb | Enable Pin b |
| 15 | Eb | Enable Pin b |
| 16 | VCC | Positive Supply |
74LS155 applications
- Connect a single source to multiple destinations
More about 74LS155
74LS155 Alternative Equivalent
74LS156
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