74LS153 Dual 4-to-1 multiplexer
The 74LS153 holds two 4-to-1 multiplexers that share the select inputs B and A. Each half passes one of its four data inputs C0 to C3 to its output Y, and each has its own active-low enable G′; with G′ high, that output is low.
74LS153 pinout
Top view of the 16-pin DIP package. Pin 1 is at the bottom left, beside the notch, and the numbers run anticlockwise. Power is on pin 16 (VCC, +5 V) and pin 8 (GND).
| Pin | Name | Type | What it is |
|---|---|---|---|
| 1 | 1G′ | Input | Input, active-low |
| 2 | B | Input | Input |
| 3 | 1C3 | Input | Input |
| 4 | 1C2 | Input | Input |
| 5 | 1C1 | Input | Input |
| 6 | 1C0 | Input | Input |
| 7 | 1Y | Output | Totem-pole output |
| 8 | GND | Ground | 0 V |
| 9 | 2Y | Output | Totem-pole output |
| 10 | 2C0 | Input | Input |
| 11 | 2C1 | Input | Input |
| 12 | 2C2 | Input | Input |
| 13 | 2C3 | Input | Input |
| 14 | A | Input | Input |
| 15 | 2G′ | Input | Input, active-low |
| 16 | VCC | Power | +5 V supply |
74LS153 function table
| G′ | B | A | Y |
|---|---|---|---|
| 1 | X | X | 0 |
| 0 | 0 | 0 | C0 |
| 0 | 0 | 1 | C1 |
| 0 | 1 | 0 | C2 |
| 0 | 1 | 1 | C3 |
X is either value.
What the 74LS153 is used for
- Selecting one of four 2-bit sources
- Implementing two functions of three variables in one package
- The sum and carry of a full adder from a single chip
Electrical summary
| Package | 16-pin DIP |
| Supply voltage | 5 V (4.75 V to 5.25 V) |
| Supply current, typical | 6.2 mA |
| Output type | Totem-pole — drives both high and low |
| Output current, low | sinks up to 8 mA |
| Output current, high | sources up to 0.4 mA |
| Input current, low | 0.4 mA out of each input held low |
| Fan-out | one output can drive about 20 LS inputs |
Typical figures for quick reference when planning a board. Check the manufacturer's datasheet for limits and timing before committing a design. The 74HC153 and 74HCT153 use the same pin numbers, with different electrical values.
Try the 74LS153 on a breadboard
The Breadboard Simulator has the 74LS153 in its parts library: seat it on a virtual breadboard, wire it, power the board and probe the pins before you build the real thing.