SNJ54HC164FK

Shift Registers Overview

The SNJ54HC164FK is an 8-bit parallel-out serial shift register manufactured by Texas Instruments in a 20-pin LCCC package. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -55°C to 125°C. The device features AND-gated serial inputs (A and B) that control data entry, alongside an asynchronous active-low clear (CLR) input. Clocking occurs on the low-to-high transition of the CLK pin. Electrical characteristics include a maximum ICC of 80 µA at 6 V across the full temperature range, typical propagation delay of 20 ns at 25°C, and output drive capabilities of ±4 mA at 5 V.

Shift Registers Feature Summary

• Features AND-gated serial inputs for complete control over incoming data entry
• Includes an asynchronous direct clear function to reset all registers immediately
• Provides fully buffered clock and serial inputs for reliable signal integrity
• Supports wide operating voltage range from 2 V to 6 V

Shift Registers Applications

• Programmable Logic Controllers
• Appliances
• Video Display Systems
• Output Expander

Shift Registers Procurement Notes

Verify the specific ordering suffix FK corresponds to the 20-pin LCCC package configuration. Confirm compliance with MIL-PRF-38535 requirements if military-grade testing is necessary, as standard production processing may not include full parameter testing. Ensure the procurement documentation matches the SNJ prefix indicating JANS or similar qualification levels if applicable to the specific orderable part number.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with AND-gated serial inputs is required for harsh environments. The SNJ54HC164FK is suitable for applications demanding extended temperature operation down to -55°C. Consider the 20-pin LCCC package for hermetic sealing needs. Verify that the 2 V to 6 V supply range aligns with system power constraints and that the asynchronous clear functionality meets timing requirements.

Shift Registers Part Context

This component belongs to the SNx4HC164 family of 8-bit parallel-out serial shift registers. It shares functional specifications with commercial variants like the SN74HC164 but utilizes the SNJ prefix to denote specific packaging and potential qualification standards. The LCCC package variant provides a distinct footprint compared to standard SOIC or PDIP options available within the same logical family.

Shift Registers Replacement Considerations

SN54HC164J

Shift Registers FAQ

How do the AND-gated serial inputs function?

Data enters the shift register only when both serial inputs A and B are high. A low signal on either input inhibits new data entry and resets the first flip-flop to low on the next clock pulse.

What triggers the clocking mechanism?

The device clocks data on the low-to-high-level transition of the CLK pin. Data can be changed while CLK is high or low, provided minimum setup time requirements are met.

What is the effect of the CLR input?

Applying a low signal to the CLR pin asynchronously sets all registers to zero immediately, regardless of the clock state.