74F193SC

Overview

The onsemi 74F193SC is a 4-bit synchronous up/down binary counter housed in a 16-lead Small Outline Integrated Circuit (SOIC) package. It features separate Count Up and Count Down clock inputs, operating synchronously with LOW-to-HIGH transitions. The device includes asynchronous Master Reset and Parallel Load capabilities, allowing immediate state overrides independent of clock signals. Terminal Count outputs facilitate multi-stage expansion without additional logic. Electrical characteristics specify operation within a +4.5V to +5.5V supply range, with maximum count frequencies reaching 125 MHz at typical conditions.

Feature Summary

• Synchronous up/down counting using separate clock inputs for direction control
• Asynchronous parallel load and master reset functions for immediate state initialization
• Dedicated terminal count outputs enabling direct cascading for multi-stage designs

Applications

• Multi-stage binary counter systems requiring synchronous operation
• Programmable counters utilizing parallel load inputs
• Digital timing circuits needing reversible counting capabilities

Procurement Notes

Verify the specific ordering suffix to confirm package type, as the SC designation corresponds to the narrow SOIC variant. Ensure compatibility with existing board layouts regarding pin pitch and footprint dimensions. Confirm that the manufacturer source aligns with current supply chain requirements, noting historical production by Fairchild Semiconductor prior to onsemi acquisition. Check for tape and reel availability if automated assembly is required, though standard tubes are common for this package style.

Selection Notes

Select this component when synchronous up/down counting with separate clock lines is required rather than ripple counting methods. The presence of dedicated terminal count outputs simplifies design complexity compared to counters lacking such features. Consider the 16-lead SOIC package constraints for space-limited applications. Verify that the input voltage levels and propagation delays meet the system's timing requirements for the intended operating frequency.

Part Context

This device belongs to the 74F series of high-speed TTL-compatible logic components. The 74F193 specifically addresses applications requiring reversible binary counting with synchronous behavior. It serves as a foundational building block for digital arithmetic units and timing controllers where precise state management and cascading capability are essential.

Replacement Considerations

Equivalent functionality may be found in other 74F series up/down counters, but pinout and feature sets must be verified. Direct substitutes should maintain synchronous operation and separate clock inputs. Package compatibility is critical; alternative packages like SOP or PDIP require mechanical verification.