PRESETTABLE BCD/DECADE UP/DOWN COUNTERS PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS The SN74LS191N is a synchronous 4-bit up/down binary counter manufactured by Texas Instruments (TEXAS). Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Logic Family:** LS (Low-Power Schottky)
- **Number of Bits:** 4-bit
- **Counting Sequence:** Synchronous Up/Down
- **Supply Voltage Range:** 4.75V to 5.25V (Nominal 5V)
- **Operating Temperature Range:** 0°C to +70°C
- **Maximum Clock Frequency:** 25 MHz (typical)
- **Power Dissipation:** 45 mW (typical)
- **Output Type:** TTL-Compatible
- **Package Type:** PDIP-16 (Plastic Dual In-Line Package)
### **Descriptions:**
The SN74LS191N is a synchronous, reversible (up/down) counter with a parallel load feature. It operates synchronously with the clock input, allowing precise control over counting direction (up or down) via a mode select input. The counter can be preset asynchronously using the parallel load input. It includes ripple clock outputs for cascading multiple counters.
### **Features:**
- **Synchronous Counting:** All flip-flops change state simultaneously.
- **Up/Down Control:** Direction of counting is controlled by a single input.
- **Parallel Load Capability:** Allows presetting the counter asynchronously.
- **Ripple Clock Output (RCO):** Used for cascading counters in multi-stage applications.
- **Low Power Consumption:** Typical power dissipation of 45 mW.
- **TTL-Compatible Inputs/Outputs:** Ensures compatibility with standard TTL logic levels.
- **16-Pin DIP Package:** Easy to use in breadboard and PCB designs.
This information is sourced directly from Texas Instruments' datasheet for the SN74LS191N. No additional guidance or suggestions are included.
