74AHC595D,118

Overview

The Nexperia 74AHC595D,118 is an 8-bit serial-in/serial or parallel-out shift register with output latches and 3-state outputs. It operates within a supply voltage range of 2.0 V to 5.5 V and features balanced propagation delays. The device includes Schmitt-trigger action on all inputs for high noise immunity and overvoltage tolerant inputs up to 5.5 V. It utilizes CMOS technology for low power dissipation and supports operation from -40 °C to +125 °C. The component is housed in a SO16 plastic small outline package (SOT109-1) with 16 leads.

Feature Summary

• Features separate clocks for the shift and storage registers, allowing independent control of data shifting and storage operations.
• Includes an asynchronous master reset input that clears the shift register when driven LOW.
• Provides a serial output pin to enable cascading multiple devices for expanded bit capacity.
• Outputs assume a high-impedance OFF-state when the output enable input is HIGH.

Applications

• Serial-to-parallel data conversion
• Remote control holding register

Procurement Notes

Verify the specific ordering suffix

Selection Notes

Select this part for designs requiring 8-bit expansion with separate clocking for shift and storage stages. Ensure the system voltage falls between 2.0 V and 5.5 V. Consider the SO16 package dimensions if PCB space is constrained. Verify input signal levels match the CMOS requirements for the AHC series.

Part Context

This component belongs to the 74AHC logic family, which offers high-speed performance with low power consumption. It is functionally compatible with other 74-series logic but optimized for CMOS applications. The 74AHC595 variant specifically targets mixed-voltage environments due to its overvoltage tolerant inputs, distinguishing it from standard HC or HCT counterparts.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the device handle cascading?

The device features a serial output (Q7S) that allows data to be shifted out from the last stage, enabling connection to the serial input of another shift register for expanding bit width.

What is the function of the MR input?

The MR (Master Reset) input is active LOW. Driving it LOW resets the shift register, clearing its contents regardless of the clock states.