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74LS390 Dual Decade Counter
74LS390
Texas Instrumentsic logic
The 74LS390 Dual Decade Counter is a digital logic IC used for counting and generating binary or decade outputs.
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Specifications
4- Operating Voltage
- 5 V (typical) to 12 V (maximum) V
- Supply Current
- 40 mA mA
- Interface
- TTL compatible
- Temperature Range
- -55°C to 125°C °C
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 | QD' | GPIO | Output of the lower decade counter |
| 2 | QC' | GPIO | Output of the lower binary counter |
| 3 | QB' | GPIO | Output of the lower binary counter |
| 4 | QA' | GPIO | Output of the lower binary counter |
| 5 | QD | GPIO | Output of the upper decade counter |
| 6 | QC | GPIO | Output of the upper binary counter |
| 7 | QB | GPIO | Output of the upper binary counter |
| 8 | QA | GPIO | Output of the upper binary counter |
| 9 | GND | GND | Ground |
| 10 | VCC | POWER | Supply voltage |
| 11 | CP | GPIO | Clock input |
| 12 | LD' | GPIO | Load enable input |
| 13 | LD | GPIO | Load enable output |
| 14 | CLK | GPIO | Clock input for the lower counter |
| 15 | CLK' | GPIO | Clock input for the upper counter |
| 16 | VCC | POWER | Supply voltage |
Interactive pinout
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74LS390
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