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74LS191 Binary Up/Down Counter
74LS191
Texas Instrumentsic logic
The 74LS191 is a synchronous binary up/down counter with down/up mode control.
In stock
Specifications
3- Package
- CDIP, CFP, PDIP, SOP
- Operating Voltage
- 5 V
- Supply Current
- 10 mA
Pinout
16Low 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 |
|---|---|---|---|
| 1 | UP/DN | GPIO | Mode select for UP or DN |
| 2 | CLOCK | GPIO | Clock input |
| 3 | Q1 | GPIO | Output for Q1 bit |
| 4 | Q2 | GPIO | Output for Q2 bit |
| 5 | Q3 | GPIO | Output for Q3 bit |
| 6 | Q4 | GPIO | Output for Q4 bit |
| 7 | Q5 | GPIO | Output for Q5 bit |
| 8 | Q6 | GPIO | Output for Q6 bit |
| 9 | Q7 | GPIO | Output for Q7 bit |
| 10 | Q8 | GPIO | Output for Q8 bit |
| 11 | CARRY OUT | GPIO | Carry out from the highest bit |
| 12 | Q9 | GPIO | Output for Q9 bit (if 9-bit counter) |
| 13 | Q10 | GPIO | Output for Q10 bit (if 10-bit counter) |
| 14 | GND | GND | Ground |
| 15 | VCC | POWER | Supply voltage |
| 16 | Q11 | GPIO | Output for Q11 bit (if 11-bit counter) |
Interactive pinout
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74LS191
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