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Product Detailed Parameters
- Description：54ALS688 8-BIT IDENTITY/MAGNITUD
- 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 SNJ54ALS688W is an 8-bit identity comparator manufactured by Texas Instruments. It compares two 8-bit binary words and outputs a logic low signal when the inputs are equal (P=Q). The device features an enable input for controlling operation. It operates within a voltage range of 4.5V to 5.5V and supports a wide operating temperature range from -55°C to 125°C. The component utilizes a 20-lead ceramic dual in-line package (CDIP) with J-leads, designed for high-reliability military and aerospace applications.
Feature Summary
- Performs 8-bit magnitude comparison with inverted output indicating equality
- Includes dedicated enable input for functional control
- Constructed in hermetic ceramic package for harsh environment reliability
Applications
- Military avionics systems requiring radiation tolerance
- Aerospace data processing units
- High-reliability industrial control logic
Procurement Notes
Verify the suffix 'W' confirms the ceramic dual in-line package with J-leads, distinct from plastic variants. Confirm the 'SNJ' prefix indicates space-grade or military qualification levels as per Texas Instruments documentation. Ensure compatibility with existing board layouts for 20-lead CDIP footprints. Check for specific lot traceability requirements if applicable to your program.
Selection Notes
Select this part when hermetic packaging and extended temperature performance are mandatory. The ALS technology offers lower power consumption compared to standard LS series while maintaining compatible speeds. Consider the physical size constraints of the 20-lead ceramic package during mechanical design. Verify that the inverted output polarity aligns with downstream logic gate requirements.
Part Context
This component belongs to the Texas Instruments SN54ALS688 family of 8-bit identity comparators. The SNJ variant specifically denotes the military/space grade version housed in a ceramic package. It serves as a digital logic solution for determining equality between two binary numbers in critical systems where standard commercial components are insufficient.
Replacement Considerations
The SN54ALS688J is a direct pin-compatible alternative within the same family, differing primarily in package lead formation details. Verify that any substitute maintains the same ceramic construction and qualification standards required for the application.
