SN74HCT165PWR

Shift Registers Overview

The SN74HCT165PWR is an 8-bit parallel-load shift register in a 16-pin TSSOP package. It operates on a 4.5 V to 5.5 V supply with an extended temperature range of –40°C to +125°C. The device features TTL-compatible CMOS inputs and balanced push-pull outputs. Key timing parameters include a maximum propagation delay of 60 ns, a clock frequency up to 25 MHz, and setup/hold times of 25 ns and 9 ns respectively.

Shift Registers Feature Summary

• Provides eight direct data inputs for asynchronous parallel loading when the shift/load pin is low.
• Features gated clock inputs and a clock-inhibit function to control serial shifting operations.
• Includes complementary serial output pins for standard or inverted data transmission.

Shift Registers Applications

• Expanding microcontroller input capacity by converting parallel peripheral signals to serial data.
• Cascading multiple units to increase system input count while maintaining single serial controller interface.
• General-purpose digital logic applications requiring parallel-to-serial conversion.

Shift Registers Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-16 package variant required for your PCB footprint. Confirm that the design supports the specified 4.5 V to 5.5 V operating voltage range. Ensure thermal management aligns with the junction-to-ambient resistance values provided in the datasheet for the target ambient temperature conditions.

Shift Registers Selection Notes

Select this component when interfacing with LSTTL or CMOS logic families due to its compatible input thresholds. Choose this part if the application requires an extended industrial temperature range up to +125°C. Consider the balanced push-pull output structure for driving moderate capacitive loads without external buffering.

Shift Registers Part Context

This device belongs to the Texas Instruments SN74HCT series, which combines high-speed CMOS processing with TTL-compatible input levels. The SN74HCT165 specifically addresses the need for parallel data acquisition in systems where serial communication lines are limited. It serves as a fundamental building block for digital input expansion and data serialization tasks.

Shift Registers Replacement Considerations

SN74HCT165PW

Shift Registers FAQ

How does the device handle unused inputs?

Unused inputs must not be left floating; they should be terminated to either VCC or ground using pull-up or pull-down resistors to prevent undefined operational states and excessive power consumption.

What is the function of the CLK INH pin?

The clock inhibit (CLK INH) input prevents clock pulses from being detected when held high, effectively pausing the shifting operation regardless of the state of the primary clock input.