Overview
The 74HC153 (CMOS) and 74LS153 (TTL) are dual 4-line to 1-line data selectors/multiplexers. By applying a 2-bit binary code to the common select pins (A and B), one of the four inputs (I0I_0 to I3I_3) is selected and passed to the output (YY). Each multiplexer includes an independent active-low strobe/enable pin, allowing flexible control of each section of the IC.
Key Features
- Dual Multiplexers: Two independent 4-to-1 multiplexers in one chip.
- Common Select Lines: Both sections share select pins (A, B), reducing GPIO usage.
- Independent Enable Pins: Active-low strobe inputs (G1‾\overline{G_1}, G2‾\overline{G_2}) allow control and cascading.
- Non-Inverting Outputs: Output directly follows the selected input.
- Breadboard Friendly: DIP-16 package suitable for prototyping and PCB design.
Technical Specifications
| Feature | 74HC153 (CMOS) | 74LS153 (TTL) |
|---|---|---|
| Operating Voltage | 2.0V to 6.0V | 4.75V to 5.25V |
| Inputs | 2 Select, 2 Strobe, 8 Data | 2 Select, 2 Strobe, 8 Data |
| Outputs | 2 Independent Outputs | 2 Independent Outputs |
| Propagation Delay | ~17 ns | ~20 ns |
| Package Type | DIP-16 | DIP-16 |
Selection Logic
| Select B | Select A | Selected Input |
|---|---|---|
| 0 | 0 | I0I_0 |
| 0 | 1 | I1I_1 |
| 1 | 0 | I2I_2 |
| 1 | 1 | I3I_3 |
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