74F579SCX

Overview

The onsemi 74F579SCX is an 8-bit bidirectional binary counter featuring multiplexed 3-STATE I/O ports for bus-oriented applications. It operates within a supply voltage range of +4.5V to +5.5V and supports an ambient temperature range of 0°C to +70°C. The device utilizes a 20-Lead Small Outline Integrated Circuit (SOIC) package. Key electrical parameters include a maximum clock frequency of 80 MHz at the upper temperature limit, with propagation delays ranging from 3.0 ns to 13.5 ns depending on the signal path. Typical supply current is 75 mA.

Feature Summary

• Multiplexed 3-STATE I/O ports enable shared bus connections
• Built-in lookahead carry capability facilitates easy cascading
• Fully synchronous operation initiated by rising clock edge
• Guaranteed minimum ESD protection of 4000V

Applications

• Bus-oriented data storage systems
• Programmable counters requiring parallel load capabilities
• Cascaded counting architectures utilizing lookahead carry

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance status via specific datasheet documentation. Ensure the SOIC-20 package matches design requirements. Check for obsolescence notices as this component originates from legacy Fairchild Semiconductor manufacturing lines now managed by onsemi.

Selection Notes

Select this component for designs requiring bidirectional counting with high-speed bus interfacing. The multiplexed I/O reduces pin count compared to standard counters. Verify that the 75 mA typical supply current fits thermal constraints. Ensure logic levels align with TTL-compatible inputs specified in the DC characteristics.

Part Context

This device belongs to the 74F series logic family, known for high-speed performance. Manufactured originally by Fairchild Semiconductor, production rights are held by onsemi. The SCX suffix indicates tape and reel packaging availability. It serves as a specialized counter solution distinct from standard flip-flop or decoder families.

Replacement Considerations

Direct substitutes include other 8-bit bidirectional counters with 3-state outputs from the 74F series. Verify pin compatibility and electrical specifications against SN74F579 equivalents. Cross-reference package dimensions for SOIC-20 variants.