SN74LS165ANG4

Shift Registers Overview

The SN74LS165ANG4 is an 8-bit parallel-load shift register from the Texas Instruments 74LS series. It features a serial output and complementary outputs available from the last stage. The device operates with a supply voltage range of 4.75 V to 5.25 V and supports a propagation delay of 25 ns. It is housed in a 16-pin SOIC package and functions within a temperature range of 0°C to +70°C.

Shift Registers Feature Summary

• Asynchronous parallel loading capability allows data input when the Parallel Load (PL) pin is held low.
• Serial shifting occurs on the rising edge of the clock signal, accepting new data via the Serial Data (DS) input.
• Integrated two-input OR gate for the clock input enables combining independent clock sources or acting as an active-low clock enable.

Shift Registers Applications

• Converting parallel data inputs into a serial data stream for transmission.
• Expanding digital input capacity in microcontroller-based systems.
• Implementing keyboard scanning matrices in embedded control units.

Shift Registers Procurement Notes

Verify that the specific ordering suffix 'G4' corresponds to lead-free and RoHS-compliant manufacturing standards as defined by Texas Instruments. Confirm the package type matches the required PCB footprint. Ensure the logic family aligns with existing circuit design requirements before finalizing procurement.

Shift Registers Selection Notes

Select this component for designs requiring TTL-compatible logic levels and asynchronous parallel loading. It serves as a direct replacement for standard 74LS165 devices where lead-free compliance is mandated. Consider the 25 ns propagation delay and 16-pin SOIC form factor when evaluating timing constraints and board space limitations.

Shift Registers Part Context

This part belongs to the SN74LS165A family of parallel-load 8-bit shift registers manufactured by Texas Instruments. The 'G4' suffix typically indicates a lead-free and RoHS-compliant variant of the standard SN74LS165AN device. It maintains functional compatibility with the broader 74LS logic family while adhering to modern environmental regulations.

Shift Registers Replacement Considerations

• SN74LS165AN
• SN74LS165AD

Shift Registers FAQ

How does the parallel load function operate?

Parallel loading occurs asynchronously when the Parallel Load (PL) input is driven LOW, immediately transferring data from the eight parallel inputs to the internal flip-flops.

What is the role of the clock input OR gate?

The two-input OR gate for the clock allows users to combine two independent clock sources or use one input as an active-low clock enable to control shifting operations.