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74HC191 Binary Up/Down Counter
74HC191
Texas Instrumentsic logic
The 74HC191 is a 4-bit synchronous reversible counter that can count up or down based on control inputs and has low power consumption.
In stock
Specifications
4- Operating Voltage
- 2 V to 6 V
- Supply Current
- 80-µA Max
- Interface
- GPIO, RCO, MAX/MIN
- Package
- PDIP (N), SOIC (D), CDIP (J), LCCC (FK), SOP (NS)
Pinout
12Low source legibility.The original manufacturer datasheet for this part was difficult to read, so this pinout may be incomplete or imperfect. Always confirm against the specific manufacturer’s datasheet before wiring.
| Pin | Name | Functions | Notes |
|---|---|---|---|
| A | CLK | GPIO | Clock input |
| B | RCO | GPIO | Ripple clock output |
| C | MAX/MIN | GPIO | Maximum/minimum count output |
| D | QA | GPIO | Output Q0 |
| E | QB | GPIO | Output Q1 |
| F | QC | GPIO | Output Q2 |
| G | QD | GPIO | Output Q3 |
| H | CTEN | GPIO | Count enable input |
| I | D/U | GPIO | Direction (up/down) control |
| J | LOAD | GPIO | Preset input |
| K | GND | GND | Ground |
| L | VCC | POWER | Supply voltage |
Interactive pinout
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74HC191
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