DM8556N

Counter Dividers Overview

The DM8556N is a synchronous positive-edge triggered 4-bit binary up counter from the National Semiconductor 85 Series. It features tri-state outputs and is housed in a 16-pin PDIP package. Designed for TTL logic compatibility, this integrated circuit provides reliable counting functionality with synchronized operation across all flip-flops.

Counter Dividers Feature Summary

• Synchronous positive-edge triggering ensures simultaneous state changes across all bits
• Tri-state output capability allows direct bus interfacing without external buffering
• 4-bit binary up counting architecture supports sequential digital accumulation

Counter Dividers Applications

• Digital frequency division circuits
• Sequential event counting systems
• Time-base generation modules

Counter Dividers Procurement Notes

Verify the manufacturer marking matches National Semiconductor or Texas Instruments specifications. Confirm the package type is 16-pin DIP. Check datasheet revisions to ensure compatibility with original 85-series design parameters. Inspect pins for corrosion or damage before installation.

Counter Dividers Selection Notes

Select this component when synchronous counting with tri-state outputs is required. Ensure system voltage levels match TTL standards. Consider pinout compatibility if replacing older 85-series designs. Verify clock signal integrity meets positive-edge trigger requirements for stable operation.

Counter Dividers Part Context

Part of the National Semiconductor 85 Series family of logic components. The DM prefix indicates military-grade temperature range availability in some variants. This specific model focuses on binary counting applications within standard industrial environments using through-hole packaging technology.

Counter Dividers Replacement Considerations

Compatible substitutes include DM8556N/B+ and other 85-series counters like DM8557N. Verify pin compatibility and electrical characteristics before substitution. Ensure replacement parts meet the same TTL logic level requirements.