74F191PC

Overview

The Fairchild Semiconductor 74F191PC is a synchronous up/down binary counter housed in a 16-pin DIP package. It features bidirectional counting capabilities with load and preset inputs, operating within the F/FAST series logic family. The device supports a maximum frequency of 90 MHz at nominal supply voltage, with a load capacitance of 50 pF and a maximum output current of 20 mA. It functions as a single four-bit binary counter with true outputs, designed for synchronous operation and compliant with RoHS standards.

Feature Summary

• Synchronous up/down binary counting functionality
• Bidirectional count direction control
• Load and preset input support
• TCO (Terminal Count Output) feature

Applications

• Programmable dividers
• Synchronous multi-stage counters
• Binary counting applications requiring bidirectional control

Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm RoHS compliance status and lead-free packaging details prior to procurement. Ensure the 16-pin DIP package matches design requirements. Check for any specific environmental certifications required by the target application region. Validate that the supplier provides original datasheets matching the Fairchild Semiconductor part number.

Selection Notes

Select this component for designs requiring high-speed synchronous binary counting with bidirectional capability. Consider the 90 MHz maximum frequency limit when determining clock speeds. Evaluate the 16-pin DIP package constraints against PCB layout requirements. Assess the 50 pF load capacitance specification for signal integrity in connected circuits. Verify compatibility with existing TTL logic levels and power supply voltages.

Part Context

The 74F191PC belongs to the Fairchild F/FAST logic series, known for high-speed performance in digital logic applications. As a synchronous binary counter, it integrates with other F-series components for complex timing and counting tasks. The device represents a standard solution for bidirectional counting needs in industrial and consumer electronics, offering reliable operation within its specified temperature range.

Replacement Considerations

Public confirmed substitute: SN74LS191D (Texas Instruments). Verify pinout compatibility and electrical parameter alignment before substitution.