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Product Detailed Parameters
- Description：IDENTITY COMPARATOR
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Type：-
- Number of Bits：-
- Output：-
- Output Function：-
- Voltage - Supply：-
- Current - Output High, Low：-
- Max Propagation Delay @ V, Max CL：-
- Current - Quiescent (Iq)：-
- Operating Temperature：-
- Package / Case：-
- Supplier Device Package：-
- Mounting Type：-
- Grade：-
- Qualification：-
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Overview
The SNJ54LS689J is an 8-bit magnitude comparator manufactured by Texas Instruments. It operates within a military-grade temperature range of -55°C to 125°C and utilizes a 20-pin ceramic dual in-line package (CDIP). The device features inverted outputs for A=B, A>B, and A<B conditions. It includes pull-up resistors on the B inputs and has a load capacitance of 45 pF with a maximum output current of 0.024 A.
Feature Summary
- Provides simultaneous comparison results for identity and magnitude relationships between two 8-bit binary words
- Features inverted logic outputs indicating equality, greater-than, or less-than conditions
- Incorporates internal pull-up resistors on the B input lines to simplify circuit design
Applications
- Military-grade digital data processing systems requiring high-temperature reliability
- Industrial control applications involving precise numerical value verification
- Automated test equipment performing binary data validation
Procurement Notes
Verify the specific suffix J indicates a ceramic DIP package when sourcing replacements. Confirm that the component meets military specifications for the -55°C to 125°C operating range. Ensure compatibility with existing 5V logic levels and check for lead-free compliance requirements if applicable to your manufacturing standards.
Selection Notes
Select this component when an 8-bit comparison function is required in harsh thermal environments. The ceramic package offers superior durability compared to plastic variants. Consider the inverted output polarity when designing interface logic to ensure correct signal interpretation without additional inversion stages.
Part Context
This part belongs to the Texas Instruments 54LS series of logic devices, designed for military and aerospace applications. It is functionally similar to the SN54LS688J but provides full magnitude comparison rather than just identity checking. The CDIP packaging ensures robustness against mechanical stress and extreme temperatures.
Replacement Considerations
The SN54LS689J serves as a commercial grade equivalent with a narrower temperature range. Verify pinout compatibility before substitution. Plastic DIP versions may lack the environmental resilience required for original military specifications.
