The SN74LS191N is a high-performance, versatile integrated circuit (IC) manufactured by Texas Instruments, a leading global semiconductor company.

• Series: 'SN74'
• Device Type: 4-bit synchronous, reversible, up/down binary counter
• Pin Configuration: 16-pin
• Inputs: Four jam inputs (J0-J3), a clock up (CPU), a clock down (CPD)
• Outputs: Carry/borrow output (RCO/BCO), and a terminal count output (TC)
• Functions: Clear and preset functions
• Maximum Clock Frequency: 25 MHz
• Technology: Low Power Schottky (LS)
• Package: Plastic DIP (Dual In-line Package)
• Applications: Computers, communication systems, control systems, and test equipment