54LS190J

Overview

The 54LS190J is a 4-bit synchronous binary counter manufactured by Rochester Electronics, LLC. It operates within the LS logic series and supports bidirectional counting via mode control inputs. The component is designed for military-grade reliability, characterized for operation across the full temperature range of -55°C to 125°C. It utilizes a ceramic DIP package with glass-sealed construction to ensure durability in harsh environments.

Feature Summary

• Synchronous 4-bit binary counting capability
• Bidirectional up/down operation with mode control
• Military-grade qualification for extreme temperatures

Applications

• Military avionics timing systems
• Spacecraft telemetry counters
• Ruggedized industrial data acquisition

Procurement Notes

Verify the specific lot traceability and MIL-PRF-38535 Class Q certification status upon receipt. Confirm that the ceramic DIP packaging matches the required environmental sealing specifications for your deployment. Ensure all documentation aligns with the original component manufacturer's datasheet requirements.

Selection Notes

Select this component when a synchronous 4-bit counter is required for high-reliability applications. It is suitable for designs needing bidirectional counting without external decoding logic. Consider the ceramic package for superior thermal and mechanical stability compared to plastic alternatives.

Part Context

This part belongs to the SN54LS190 family of synchronous up/down counters. It is distinct from asynchronous counters due to its clocked operation. The 'J' suffix typically denotes the ceramic DIP package variant, ensuring compatibility with hermetic sealing standards required for aerospace and defense electronics.

Replacement Considerations

Direct replacements include other SN54LS190 variants from qualified manufacturers. Verify pinout compatibility and electrical characteristics before substitution. Ensure the replacement meets the same military temperature and radiation hardness requirements.