The SN74LS191NSR is a high-performance integrated circuit (IC) produced by Texas Instruments, a renowned global semiconductor company known for its innovative ICs and analog chips.

• Family: SN74LS
• Technology: Low power Schottky (LS)
• Device Type: 4-bit synchronous, reversible, up/down binary counter
• Modes: Count-up and count-down
• Features: Internal carry look-ahead for high-speed counting designs
• Inputs: Direct clear input and individual preset inputs for each flip-flop
• Outputs: Can drive up to 10 Low Power Schottky inputs
• Operating Voltage Range: 4.75V to 5.25V
• Operating Temperature Range: 0 to 70 degrees Celsius
• Package: 8-bit SOIC package
• Compliance: RoHS compliant