The SN74ALS191ANSR from Texas Instruments is a high-performance integrated circuit (IC) that is designed to offer superior functionality and efficiency in a variety of digital applications.

• Series: SN74ALS191A series
• Type: high-speed, low-power, and edge-triggered 4-bit up/down binary counters
• Counting: Count in both the upward and downward direction
• Feature: Count enables a gating structure that allows transitions to occur on the clock input's LOW-to-HIGH transition
• Voltage Range: 4.5 V to 5.5 V
• Maximum Clock Frequency: 25 MHz
• Package: 16-pin NSOIC package
• Compliance: RoHS (Restriction of Hazardous Substances) compliant
• Compatibility: Compatible with most MOS and TTL (Transistor-Transistor Logic) families
• Temperature Range: -40°C to 85°C