74AHCT595D,112

Shift Registers Overview

The Nexperia 74AHCT595D,112 is an 8-bit serial-in/serial or parallel-out shift register with output latches and 3-state outputs. It features separate clocks for the shift and storage registers, a serial input (DS), and a serial output (Q7S) for cascading. An asynchronous reset (MR) input clears the shift register on a LOW level. Data shifts on LOW-to-HIGH transitions of the SHCP input and transfers to the storage register on STCP transitions. The device operates with TTL compatible inputs and supports a supply voltage range from 4.5 V to 5.5 V. It is housed in an SO16 plastic small outline package (SOT109-1).

Shift Registers Feature Summary

• TTL compatible inputs for mixed voltage environments.
• Overvoltage tolerant inputs up to 5.5 V.
• Separate shift and storage register clocks.
• Asynchronous master reset functionality.

Shift Registers Applications

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

Shift Registers Procurement Notes

Verify the specific ordering suffix '112' against the manufacturer's current production status, as availability may vary by region. Confirm that the SO16 package type matches the design requirements. Ensure the TTL input logic levels are compatible with the source circuitry before integration into the final system design.

Shift Registers Selection Notes

Select this component when TTL logic interface compatibility is required within a CMOS environment. The overvoltage tolerant inputs allow safe operation in mixed voltage systems without additional level shifting components. The separate clock inputs provide precise control over data shifting and storage timing sequences.

Shift Registers Part Context

This part belongs to the 74AHCT595 family, which combines high-speed CMOS technology with TTL-compatible input thresholds. The 'D' designation indicates the SO16 package variant, while the '112' suffix specifies the tape and reel packaging configuration. It serves as a standard solution for expanding parallel outputs from serial data lines in digital control applications.

Shift Registers Replacement Considerations

Direct substitutes include other manufacturers' 74AHCT595 variants in SOIC-16 packages. Verify pinout compatibility and electrical specifications such as propagation delay and output drive current before substitution.

Shift Registers FAQ

How does the asynchronous reset function?

A LOW signal on the MR input immediately resets the shift register stages, regardless of the clock states.

What is the purpose of the Q7S output?

The Q7S pin provides a serial output from the last stage of the shift register, enabling the cascading of multiple devices.