← All parts
74HC191 Binary Up/Down Counter
74HC191
Texas Instrumentsic logic
The SN54HC191 and SN74HC191 are 4-bit synchronous up/down binary counters with wide operating voltage range, low power consumption, and asynchronous preset capability.
In stock
Specifications
3- Operating Voltage Range
- 2 V to 6 V
- Power Consumption
- <80 μA Max mA
- Output Drive
- ±4 mA at 5 V
Pinout
20| Pin | Name | Functions | Notes |
|---|---|---|---|
| 1 | VCC | POWER | Power supply |
| 2 | QD | GPIO | Output Q4 |
| 3 | QA | GPIO | Output Q1 |
| 4 | CTEN | GPIO | Count enable input |
| 5 | D¸U | GPIO | Down/Up control input |
| 6 | QC | GPIO | Output Q3 |
| 7 | QD | GPIO | Output Q4 |
| 8 | GND | GND | Ground |
| 9 | D¸U | GPIO | Down/Up control input (alternate) |
| 10 | QD | GPIO | Output Q4 |
| 11 | QC | GPIO | Output Q3 |
| 12 | MAX/MIN LOAD | GPIO | Load control input (max/min) |
| 13 | RCO | GPIO | Reset output |
| 14 | CLK | GPIO | Clock input |
| 15 | QD | GPIO | Output Q4 (alternate) |
| 16 | VCC | POWER | Power supply |
| 17 | NC | GPIO | No internal connection (alternate) |
| 18 | CLK | GPIO | Clock input |
| 19 | NC | GPIO | No internal connection (alternate) |
| 20 | MAX/MIN LOAD | GPIO | Load control input (max/min) (alternate) |
Interactive pinout
Highlight:
74HC191
Click a pin to copy its name · tap a tag above to spotlight a bus.