74LS190 Up/Down Decade Counter
Package SOIC Series 74LS
74LS190 overview
The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. The 74LS190 is a synchronous UP/DOWN BCD Decade (8421) Counter and State changes of the counters are synchronous with the A LOW-to-HIGH transition of the Clock Pulse input.
Key specifications
Supply Voltage
4.75 - 5.25Vdc
Maximum Clock Frequency
40Mhz
Power Dissipation
2mW/gate @100kHz
Minimum Output Current
8mA
Propagation Delay
10nS
Fan Out (TTL Loads)
20
Datasheet
190.pdf
74LS190 features
- Synchronous Up/Down BCD Decade Counter, Count is Updated with Low-to-High Clock Transition
- Synchronous Counting
- High Speed up to 25MHz
- Individual Preset Inputs
- Standard TTL Switching Voltages
74LS190 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | P1 | Parallel Data Input |
| 2 | Q1 | Flip-Flop Output |
| 3 | Q0 | Flip-Flop Output |
| 4 | CE' | Count Enable (Active LOW) Input |
| 5 | U/D | Up/Down Count Control Input |
| 6 | Q2 | Flip-Flop Output |
| 7 | Q3 | Flip-Flop Output |
| 8 | GND | Ground |
| 9 | P3 | Parallel Data Input |
| 10 | P2 | Parallel Data Input |
| 11 | PL' | Parallel Load Control (Active LOW) Input |
| 12 | TC | Terminal Count Output |
| 13 | RC' | Ripple Clock Output |
| 14 | CP | Clock Pulse (Active HIGH going edge) Input |
| 15 | P0 | Parallel Data Input |
| 16 | VCC | Positive Supply |
74LS190 applications
- Clock generation
- Clock division
- Integrated oscillator
- Low power CMOS
- TTL compatible inputs
- In frequency counting circuits
More about 74LS190
74LS190 Alternative Equivalent
74LS162
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