74F191SCX

Overview

The onsemi 74F191SCX is a synchronous up/down 4-bit binary counter housed in a 16-lead SOIC package. It features asynchronous parallel load capability and operates within a supply voltage range of +4.5V to +5.5V. The device supports a maximum count frequency of 100 MHz, with propagation delays from clock to output ranging from 3.0 ns to 12.0 ns depending on the specific transition and temperature conditions.

Feature Summary

• Synchronous counting triggered by rising clock edges
• Asynchronous parallel preset for programmable division
• Terminal Count and Ripple Clock outputs for cascading

Applications

• Programmable frequency dividers
• Multistage counter designs using ripple clock configuration
• Synchronous counters utilizing gated carry/borrow logic

Procurement Notes

Verify component authenticity through authorized channels as this part is obsolete. Confirm that the SOIC-16 package dimensions match the M16A JEDEC standard. Ensure design compatibility with the specified operating temperature range and electrical characteristics before integration.

Selection Notes

Select this component for applications requiring synchronous bidirectional counting with preset capabilities. Consider the propagation delay specifications when designing high-speed circuits. Verify that the power supply voltage remains strictly within the recommended limits to ensure reliable operation.

Part Context

This device belongs to the 74F logic family, characterized by high-speed bipolar technology. It serves as a reversible modulo-16 counter, providing essential timing control functions in digital systems where precise state sequencing and direction control are required.

Replacement Considerations

SN74LS191D is listed as a similar replacement option.