SN74AHC595NSR

Shift Registers Overview

The SN74AHC595NSR is an 8-bit serial-in, parallel-out shift register manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 5.5 V and features a 16-pin NS (SOP) package. The device includes a direct overriding clear input for the shift register and separate clocks for the shift and storage registers. Outputs are tri-state, controlled by an output-enable pin. It supports cascading via a serial output and provides ESD protection exceeding specified JESD standards.

Shift Registers Feature Summary

• Contains an 8-bit serial-in, parallel-out shift register feeding an 8-bit D-type storage register with parallel 3-state outputs.
• Features separate positive-edge triggered clocks for the shift register and storage register, allowing independent timing control.
• Includes a direct overriding clear input for the shift register and a serial output pin designed for cascading multiple devices.

Shift Registers Applications

• Serial-to-parallel data conversion in digital logic circuits
• Cascaded expansion of I/O ports using minimal microcontroller pins
• Display driver interfaces requiring latched parallel outputs

Shift Registers Procurement Notes

Verify the ordering suffix 'SR' corresponds to tape-and-reel packaging as documented in the official TI datasheet. Confirm the 'NS' package designation matches the required SOP footprint and pin pitch for your PCB layout. Ensure the component grade aligns with the -40°C to 85°C operating temperature range specified for the SN74AHC595 series.

Shift Registers Selection Notes

Select this part when a low-power CMOS shift register with tri-state outputs is required. The AHC logic family ensures compatibility with standard 3.3 V and 5 V systems. Verify that the 16-pin SOP package fits the available board space and that the thermal impedance of the NS package meets the system's heat dissipation requirements.

Shift Registers Part Context

This component belongs to the Texas Instruments SN74AHC595 family of high-speed CMOS logic devices. The 'AHC' designation indicates advanced high-speed CMOS technology, offering performance comparable to LS TTL but with lower power consumption. The NS package variant specifically denotes a plastic small-outline package suitable for surface-mount assembly.

Shift Registers Replacement Considerations

SN74AHC595DR

Shift Registers FAQ

How does the direct clear input function?

The SRCLR input provides a direct override that clears the shift register regardless of the clock or data inputs, resetting all stages to a low state.

What is the purpose of the QH' output?

The QH' pin serves as the serial output for the shift register, allowing data to be cascaded into subsequent shift registers without additional logic gates.