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Product Detailed Parameters
- Description：54HC166 PARALLEL-LOAD 8-BIT SHIF
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Logic Type：-
- Output Type：-
- Number of Elements：-
- Number of Bits per Element：-
- Function：-
- Voltage - Supply：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The SNJ54HC166J is a military-grade, parallel-load 8-bit shift register from the Texas Instruments HC logic family. It operates within a supply voltage range of 2V to 6V and supports an operating temperature range of -55°C to +125°C. The device features synchronous loading, serial shifting, and direct overriding clear functions. It utilizes a 16-pin ceramic dual in-line package (CDIP) designed for high reliability in harsh environments.
Feature Summary
- Military-grade radiation-hardened construction suitable for aerospace applications
- Synchronous parallel load capability with asynchronous clear function
- High-impedance standard CMOS inputs requiring termination when unused
Applications
- Aerospace systems requiring radiation tolerance
- Harsh environment data acquisition
- Microcontroller input expansion
Procurement Notes
Verify that the specific ordering suffix matches the required military or space qualification standards. Confirm the package type corresponds to the CDIP variant. Ensure the component meets the necessary environmental testing requirements for your specific deployment conditions before finalizing procurement.
Selection Notes
Select this component when radiation hardness and wide temperature operation are mandatory. It is appropriate for designs requiring simple GPIO control without complex communication interfaces. Verify that the 16-pin CDIP footprint fits the mechanical constraints of the target system.
Part Context
This part belongs to the SN54HC166 series, which includes variants like the SN74HC166 for commercial use. The 'SNJ' prefix indicates a specific military-grade packaging and qualification level distinct from standard commercial logic devices. It shares functional compatibility with other 8-bit parallel-load shift registers in the HC family.
Replacement Considerations
SNJ54HC166FK
FAQ
How does the SH/LD input control the device mode?
When SH/LD is low, parallel data is loaded synchronously on the clock edge. When SH/LD is high, the device shifts serial data from the SER input.
What is the function of the CLR input?
The CLR input provides a direct overriding clear function that resets all flip-flops to zero, independent of the clock signal.
