74F579SC

Overview

The onsemi 74F579SC is an 8-bit bidirectional binary counter featuring multiplexed 3-STATE I/O ports, housed in a 20-Lead Small Outline Integrated Circuit (SOIC) package. It operates within a supply voltage range of +4.5V to +5.5V and supports a typical count frequency of 100 MHz. The device utilizes positive edge-triggered clocking for all state changes, including counting and parallel loading. Key electrical characteristics include a maximum clock frequency of 80 MHz at the upper temperature limit and guaranteed ESD protection of 4000V minimum.

Feature Summary

• Multiplexed 3-STATE I/O ports enable bus-oriented applications by sharing data lines with outputs.
• Built-in lookahead carry capability facilitates easy cascading for multi-stage counting operations.
• Fully synchronous design ensures predictable operation where all state changes are initiated by the rising edge of the clock.

Applications

• Bus-oriented digital systems requiring shared data paths
• Cascaded multi-bit counting architectures utilizing lookahead carry
• Programmable counters requiring parallel load capabilities

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm the specific ordering code matches the required package variant, as suffixes indicate different physical packages. Check current product status, as this item may be discontinued or subject to limited availability. Ensure environmental compliance documentation aligns with project requirements before finalizing procurement.

Selection Notes

Select this component when a fully synchronous 8-bit up/down counter with tri-state output buffering is required. It is suitable for designs needing high-speed operation up to 80 MHz and integrated carry lookahead for expansion. Consider the 20-SOIC package constraints and the specific logic family voltage levels. Evaluate power consumption requirements against the typical supply current specifications provided in the datasheet.

Part Context

This part belongs to the 74F logic series, known for high-speed performance. The 74F579 specifically addresses applications needing bidirectional counting with multiplexed I/O. It serves as a specialized counter distinct from standard flip-flops or decoders, offering integrated control inputs for direction, enable, and reset functions within a single IC package.

Replacement Considerations

Devices are also available in Tape and Reel format by appending the suffix letter 'X' to the ordering code. Other package options include SOP (74F579SJ) and PDIP (74F579PC). Verify pinout compatibility and electrical specifications when substituting with equivalent parts from other manufacturers.