Texas Instruments

SN74LS191N  

Unclassified

SN74LS191N Description

The SN74LS191N from Texas Instruments is a 4-bit synchronous up/down binary counter in the 74LS series, designed for high-performance digital counting applications. Housed in a 16-pin DIP package, it operates within a 4.75V to 5.25V supply range and supports a 25MHz count rate, making it suitable for high-speed logic systems. With synchronous operation and positive-edge triggering, it ensures precise timing and minimizes skew in counting sequences. The device is RoHS3 compliant and features a wide operating temperature range (0°C to 70°C), ensuring reliability in industrial and commercial environments.

SN74LS191N Features

• 4-bit binary counter with up/down counting capability, offering flexible direction control.
• Synchronous timing ensures all flip-flops transition simultaneously, reducing propagation delays.
• High-speed performance with a 25MHz maximum count rate, ideal for time-critical applications.
• Low-power Schottky (LS) technology balances speed and power efficiency.
• Positive-edge triggered for reliable clock synchronization.
• Wide supply voltage tolerance (4.75V–5.25V) enhances compatibility with TTL systems.
• Through-hole mounting (DIP) simplifies prototyping and breadboarding.
• REACH unaffected and EAR99 classified, ensuring global compliance.

SN74LS191N Applications

The SN74LS191N is widely used in:

• Frequency dividers and digital clocks for precise timing control.
• Industrial automation systems requiring bidirectional counting (e.g., position encoders).
• Microcontroller-based projects for event counting or pulse generation.
• Test and measurement equipment where synchronous counting is critical.
• Educational electronics kits due to its straightforward DIP package and robust performance.

Conclusion of SN74LS191N

The SN74LS191N stands out as a versatile, high-speed 4-bit counter with synchronous operation and bidirectional counting. Its LS technology ensures efficient power usage, while the 25MHz count rate makes it suitable for demanding applications. Whether in industrial controls, digital instrumentation, or prototyping, this counter delivers reliability, precision, and ease of integration, solidifying its place in modern digital designs.

SN74LS191N Documents

Download datasheets and manufacturer documentation for SN74LS191N

Datasheets :

SN54,74(LS)190,191      

HTML Datasheet :

SN54,74(LS)190,191      

PCN Design/Specification :

Material Set 30/Mar/2017