SN74HC165NE4

Shift Registers Overview

The SN74HC165NE4 is an 8-bit parallel-load shift register from Texas Instruments, belonging to the HC logic family. It converts eight parallel data inputs into a serial output stream. The device operates within a supply voltage range of 2 V to 6 V and supports a maximum operating frequency of 25 MHz at 6 V. It features a serial input for daisy-chaining multiple units and includes clock inhibit and clear functions. The component is housed in a 16-pin DIP package and is rated for operation between -40°C and +85°C.

Shift Registers Feature Summary

• Parallel-to-serial data conversion capability with dedicated parallel load control
• Daisy-chainable architecture via serial input/output interface
• High-speed CMOS construction ensuring low power consumption

Shift Registers Applications

• Expanding digital input capacity in microcontroller systems
• Keyboard matrix scanning circuits
• Industrial control panel status monitoring

Shift Registers Procurement Notes

Verify the specific suffix NE4 indicates the standard PDIP-16 package configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the ordering part number matches the exact pinout and electrical specifications required by the design schematic.

Shift Registers Selection Notes

Select this component when an 8-bit parallel input expansion is required using a single serial line. The HC series offers compatibility with standard 5 V logic levels while supporting lower voltage operation down to 2 V. Consider the DIP package form factor for prototyping or through-hole manufacturing requirements.

Shift Registers Part Context

This part belongs to the SN74HC165 family of 8-bit parallel-load shift registers manufactured by Texas Instruments. The HC designation signifies high-speed CMOS technology, providing faster switching speeds compared to legacy LS series devices while maintaining similar power characteristics. The NE4 suffix typically denotes the lead-free PDIP-16 packaging variant.

Shift Registers Replacement Considerations

SN74HC165N

Shift Registers FAQ

What is the function of the parallel load (PL) pin?

The PL pin controls the loading of parallel data. When driven low, it transfers the state of the eight parallel inputs directly to the internal flip-flops, overriding the serial input.

How does the serial input allow for cascading?

The serial output (Q7') connects to the serial input (DS) of the next stage, allowing multiple shift registers to be linked together to expand the total number of parallel inputs beyond eight bits.