Catalog > Semiconductors > Integrated Circuits 74191 Counter Synchronous Up/Down Binary Counter Part No: 74191 17.19 ZAR inc for 1 Each (Quoting) Add to Cart Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Synchronous up/down counting Parallel preset capability Cascade connection for larger counters High-speed TTL operation Terminal count outputs for expansion Typical Applications Digital counters Frequency division Position counting Timers Control systems and sequencing Specifications Logic Family: TTL (74xx series) Function: 4-bit synchronous up/down binary counter Package: 16-pin DIP Count Range: 0 to 15 (binary) Clock Input: Synchronous clock Count Direction Control: Up/Down input Parallel Data Inputs: 4 (A–D) Parallel Load: Active LOW load input Outputs: Q0–Q3 Terminal Count Outputs: Ripple Carry (RC) Terminal Count (TC) for cascading Enable Inputs: Count enable/control inputs Supply Voltage (Vcc): 4.75 V – 5.25 V (5 V nominal) Absolute Max Vcc: ~7 V Input Voltage Range: –0.5 V to Vcc Logic HIGH (VIH): ≥ 2.0 V Logic LOW (VIL): ≤ 0.8 V Output HIGH (VOH): ≥ 2.4 V Output LOW (VOL): ≤ 0.4 V Propagation Delay: ~20–35 ns typical Max Clock Frequency: ~25 MHz (typical TTL conditions) Power Dissipation: ~60 mW typical Operating Temperature: 0 °C to 70 °C