Diodes Incorporated 74AHC164D14

Overview

74AHC164D14 from Diodes Incorporated is an 8-bit serial-in/parallel-out edge-triggered shift register with asynchronous master reset, dual ANDed serial inputs (DSA/DSB), positive-edge clock (CP), and eight buffered Q0–Q7 outputs. It operates from 2.0V to 5.5V, sinks/sources 8mA at V_CC = 4.5V, and features Schmitt-trigger inputs for noise immunity-used in PC peripheral data serialization and optical drive control logic.

For engineers reviewing the 74AHC164D14 datasheet, 74AHC164D14 pinout, 74AHC164D14 application, or 74AHC164D14 equivalent, key selection criteria include its asynchronous MR assertion timing, CP-to-Q propagation delay (≤11.5 ns at 5V), dual-input AND logic flexibility, and PDIP-14 package compatibility with legacy through-hole prototyping and industrial control boards.

Technical Context

The 74AHC164D14 implements a synchronous 8-stage D-type flip-flop chain with serial data loaded into Q0 on each rising CP edge and shifted rightward (Q_n → Q_n+1). Its dual serial inputs (DSA and DSB) are internally ANDed, enabling one pin to act as data and the other as enable-supporting gated serial load without external logic.

Master Reset (MR) is asynchronous and forces all Q outputs LOW independently of CP or input states. The device uses CMOS AHC technology, delivering rail-to-rail output swing, low static current (≤80 µA), and ESD robustness (2 kV HBM), making it suitable for mixed-voltage interfacing between 3.3V microcontrollers and 5V display drivers.

Key Specifications

Pinout & Package

74AHC164D14 is housed in a 14-pin plastic dual in-line package (PDIP-14) with 0.3-inch body width and standard through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows counter-clockwise order when viewed from top.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.

Compared with SN74HC164N and 74LV164PW, the 74AHC164D14 uniquely combines PDIP-14 availability, Schmitt-trigger inputs, 125 MHz capability at 5V, and ±8 mA drive-making it the only drop-in solution for noise-prone, mixed-voltage, through-hole legacy upgrades.

Availability

74AHC164D14 is available at Aetrix Electronics and suitable for PC peripheral control, optical drive data serialization, and industrial panel display driver applications requiring stable component supply across extended product lifecycles.

Supply support for 74AHC164D14 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and logic devices, with design centers in Asia, Europe, and the U.S., and manufacturing in Taiwan and China.

The 74AHC164D14 belongs to Diodes' AHC logic family-engineered for high-speed, low-power, mixed-voltage interoperability in computing, storage, and industrial control systems.

FAQ

Can DSA and DSB be used independently for different functions?

No-DSA and DSB are internally ANDed, so both must be HIGH to pass data to Q0. One pin can serve as an enable (tied HIGH or controlled), while the other carries serial data. Tying them together is acceptable for single-input operation, but they cannot operate as separate asynchronous inputs.

What happens to Q outputs during MR assertion?

When MR is driven LOW, all Q0–Q7 outputs immediately go LOW asynchronously-regardless of CP state or input conditions. Outputs remain LOW until MR returns HIGH and at least 2.5 ns elapses before the next CP rising edge, per datasheet t_rec.

Is the 74AHC164D14 compatible with 3.3V-only systems?

Yes-it operates down to 2.0V and meets all AC/DC specifications at V_CC = 3.3V, including 8 mA drive, 105 MHz max clock, and Schmitt-trigger thresholds scaled to 3.3V levels (VIH ≈ 2.1 V, VIL ≈ 0.9 V), ensuring robust interfacing with 3.3V microcontrollers.

Does the PDIP-14 package support wave soldering?

Yes-the 74AHC164D14 PDIP-14 package is rated for standard wave soldering profiles per JEDEC J-STD-020. Peak temperature must not exceed 240°C for ≤10 seconds; preheat ramp rate ≤3°C/s; and thermal profile must avoid exceeding 150°C for >90 seconds to prevent internal delamination.