SN74HC165PW

Shift Registers Overview

The SN74HC165PW is an 8-bit parallel-load shift register manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports a maximum frequency of 25 MHz. The device features serial/parallel-to-serial counting order with one circuit and nine input lines. It provides one output line and utilizes HC logic family CMOS technology. The component is housed in a TSSOP-16 package, designed for surface mount installation, and functions reliably across an operating temperature range from -40°C to +125°C.

Shift Registers Feature Summary

• Converts eight bits of parallel data into a single serial output stream via asynchronous parallel loading.
• Supports cascading configurations to expand input capacity beyond the standard eight-bit limit.
• Provides complementary serial outputs (QH and QH') for flexible interface integration.

Shift Registers Applications

• Expanding digital input capabilities for microcontroller systems requiring multiple switch states.
• Keyboard matrix scanning applications in embedded control interfaces.
• Data acquisition systems monitoring discrete sensor inputs.

Shift Registers Procurement Notes

Verify the specific suffix 'PW' corresponds to the TSSOP-16 package variant during sourcing. Confirm RoHS compliance status and lead times directly with authorized distributors or Texas Instruments. Ensure the ordering part number matches the required temperature grade and packaging format for your production environment.

Shift Registers Selection Notes

Select this component when a low-pin-count solution is needed to read multiple switches or sensors. The wide supply voltage range allows compatibility with both 3.3 V and 5 V logic families. Consider the propagation delay specifications if high-speed data shifting is critical to your application timing requirements.

Shift Registers Part Context

This device belongs to the SN74HC165 series of 8-bit parallel-load shift registers. It shares functional similarities with other members of the HC logic family but differs in physical packaging and specific manufacturing revisions. The PW suffix specifically denotes the Thin Shrink Small Outline Package (TSSOP) form factor used for space-constrained printed circuit board designs.

Shift Registers Replacement Considerations

SN74HC165PWR

Shift Registers FAQ

What is the function of the !PL pin?

The !PL pin is an active-low asynchronous parallel load input. When driven low, it loads the data present on the A through H pins into the register immediately, independent of the clock signal.

How does the device handle unused input pins?

Unused parallel input pins should be tied to a defined logic level (VCC or GND) rather than left floating to prevent undefined states or excessive power consumption during operation.