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Product Detailed Parameters
- Description：DECADE COUNTER
- Series：*
- Mfr：Rochester Electronics, LLC
- Package：Bulk
- Logic Type：-
- Direction：-
- Number of Elements：-
- Number of Bits per Element：-
- Reset：-
- Timing：-
- Count Rate：-
- Trigger Type：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Voltage - Supply：-
- Grade：-
- Qualification：-
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Overview
The SN54191J/B is a military-grade, synchronous 4-bit up/down counter manufactured by Rochester Electronics. It features parallel data loading capabilities and operates within the standard military temperature range of -55°C to +125°C. The device utilizes a hermetically sealed ceramic package designed for high reliability in harsh environments. It supports bidirectional counting operations controlled by an up/down input signal.
Feature Summary
- Military-grade construction with hermetically sealed ceramic packaging
- Synchronous 4-bit up/down counting functionality
- Parallel data load capability for direct value setting
- Operates across the full extended military temperature range
Applications
- Aerospace navigation systems requiring high reliability
- Military communication equipment timing circuits
- Harsh environment industrial control logic
- Defense radar system counters
Procurement Notes
Verify the specific suffix 'J/B' against the official datasheet to confirm pinout and package dimensions. Ensure the component meets MIL-STD-883 requirements if military qualification is mandatory. Check for lot traceability documentation required for aerospace or defense procurement contracts.
Selection Notes
Select this component when military environmental tolerance and long-term stability are critical. It is suitable for designs requiring synchronous counting with parallel load inputs in extreme temperatures. Consider package availability and lead times for ceramic packages compared to standard plastic variants.
Part Context
This part belongs to the SN54xxx series of logic components, which are distinguished from their SN74xxx counterparts by wider operating temperature ranges and stricter manufacturing controls. The SN54191 specifically addresses applications needing reliable binary counting in mission-critical systems where failure is not an option.
Replacement Considerations
Direct replacements include other SN54191 variants with compatible suffixes such as SN54191W or SN54191FK. Verify that substitute parts maintain the same ceramic package style and military temperature rating to ensure mechanical and thermal compatibility.
