74F569PC

Overview

The onsemi 74F569PC is a fully synchronous, reversible binary counter featuring 3-STATE outputs. It operates within a supply voltage range of +4.5V to +5.5V and supports a maximum clock frequency of 90 MHz at +25°C. The device utilizes edge-triggered flip-flops where state changes are initiated by the rising edge of the clock pulse. It includes both synchronous and master asynchronous reset inputs, parallel load capability for programmable operation, and lookahead carry features for easy cascading.

Feature Summary

• Fully synchronous bidirectional counting with 3-STATE output buffers
• Lookahead carry capability for efficient multi-stage cascading
• Programmable operation via parallel preset inputs
• Dual reset options including master asynchronous and synchronous modes

Applications

• Bus organized systems requiring high-impedance states
• Synchronous multi-stage counters using lookahead connections
• Programmable binary sequence generators
• Digital systems requiring precise up/down direction control

Procurement Notes

Verify package compatibility as the 74F569PC specifically denotes the 20-Lead Plastic Dual-In-Line Package (PDIP). Confirm that the design environment supports the required +4.5V to +5.5V supply voltage range. Ensure that signal timing meets the specified setup and hold times relative to the rising clock edge to prevent operational errors during counting or loading sequences.

Selection Notes

Select this component when a fully synchronous 4-bit reversible counter with tri-state outputs is required. It is suitable for designs needing lookahead carry logic to minimize propagation delays in cascaded configurations. Consider the 74F series speed characteristics and standard TTL-compatible input/output voltage levels. Verify that the 20-pin PDIP package fits the target PCB layout constraints.

Part Context

The 74F569 belongs to the 74F logic family, known for high-speed performance. It is a 4-bit bidirectional counter designed for applications requiring fast counting rates and flexible control modes. The device integrates parallel data loading and multiple reset functions into a single integrated circuit, providing a compact solution for complex digital counting tasks.

Replacement Considerations

Check datasheets for other 4-bit bidirectional counters with 3-STATE outputs from the same logic family. Ensure pinout compatibility and electrical specifications match the original design requirements before substituting.