74AHC595PW,118

Overview

The Nexperia 74AHC595PW,118 is an 8-bit serial-in/serial or parallel-out shift register with output latches. It features a storage register and three-state outputs. Both the shift and storage registers have separate clocks. The device includes a serial input (DS) and a serial output (Q7S) for cascading, along with an asynchronous reset (MR) input. Data shifts on LOW-to-HIGH transitions of the SHCP input and transfers to the storage register on STCP transitions. Outputs appear when OE is LOW; HIGH OE causes high-impedance OFF-state. Supply voltage ranges from 2.0 V to 5.5 V. Operating temperature spans -40 °C to +125 °C. Package is TSSOP16 (SOT403-1).

Feature Summary

• Provides 8-bit serial-to-parallel data conversion capabilities with independent shift and storage clock inputs.
• Features three-state outputs controlled by an active-low enable input for bus driving applications.
• Includes overvoltage tolerant inputs allowing operation in mixed-voltage environments up to 5.5 V.
• Offers Schmitt-trigger action on all inputs for improved noise immunity.

Applications

• Serial-to-parallel data conversion
• Remote control holding register
• Register once, drag and drop

Procurement Notes

Verify the specific ordering suffix matches the required package variant. Confirm RoHS compliance status as per current manufacturer documentation. Check lead times directly with authorized distributors. Ensure ESD handling procedures are followed during assembly. Validate pinout compatibility with existing PCB footprints before finalizing procurement decisions.

Selection Notes

Select this component for designs requiring 8-bit shift register functionality with tri-state outputs. Suitable for CMOS logic families operating between 2.0 V and 5.5 V. Consider the TSSOP16 package for space-constrained surface-mount applications. Verify input voltage levels match system requirements, as AHC variants use CMOS levels. Evaluate thermal dissipation needs based on total power dissipation limits specified in the datasheet.

Part Context

This part belongs to the 74AHC series of high-speed CMOS logic devices manufactured by Nexperia. It is functionally compatible with other 74HC595 variants but offers improved switching speeds. The PW suffix indicates the TSSOP16 plastic thin shrink small outline package. It shares the same logical architecture as the 74AHCT595, though input voltage thresholds differ.

Replacement Considerations

The 74AHC595D,118 serves as a direct functional substitute using the SOIC-16 package. Designers must verify footprint differences when swapping between TSSOP and SOIC packages. Electrical characteristics remain identical across these package variations within the same logic family.

FAQ

How does the output enable input affect the register state?

The OE input controls the output state but does not affect the internal state of the shift or storage registers. A HIGH on OE causes outputs to assume a high-impedance OFF-state.

What is the purpose of the Q7S pin?

The Q7S pin provides a serial data output that allows multiple devices to be cascaded together for expanding the number of available parallel outputs.

Can this device operate with TTL input levels?

No, the 74AHC595 operates with CMOS input levels. The 74AHCT595 variant is required for TTL compatible inputs.