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74LS191 Binary Up/Down Counter
74LS191
Texas Instrumentsic logic
The SN74LS191 is a 4-bit binary up/down counter with asynchronous clear and preset inputs, commonly used in digital circuits for counting applications.
In stock
Specifications
3- Operating Voltage
- 5V Volts
- Package Type
- SOIC
- Number Of Pins
- 16
Pinout
16| Pin | Name | Functions | Notes |
|---|---|---|---|
| 1 | VCC | POWER | Power supply |
| 2 | GND | GND | Ground reference |
| 3 | C1 | GPIO | Clock input for up counting |
| 4 | C2 | GPIO | Clock input for down counting |
| 5 | Q1 | GPIO | Output Q1 of the counter |
| 6 | Q2 | GPIO | Output Q2 of the counter |
| 7 | Q3 | GPIO | Output Q3 of the counter |
| 8 | Q4 | GPIO | Output Q4 of the counter |
| 9 | CLR | GPIO | Asynchronous clear input for resetting to 0 |
| 10 | PRESET | GPIO | Asynchronous preset input for setting to all 1s |
| 11 | GND | GND | Ground reference |
| 12 | VCC | POWER | Power supply |
| 13 | Q4' | GPIO | Output Q4' of the counter (complementary output) |
| 14 | Q3' | GPIO | Output Q3' of the counter |
| 15 | Q2' | GPIO | Output Q2' of the counter |
| 16 | Q1' | GPIO | Output Q1' of the counter (complementary output) |
Interactive pinout
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74LS191
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