Diodes Incorporated 74AHC164T14-13

Overview

74AHC164T14-13 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 clocking (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 display interface timing control.

For engineers reviewing the 74AHC164T14-13 datasheet, 74AHC164T14-13 pinout, 74AHC164T14-13 application, or 74AHC164T14-13 equivalent, this device supports high-speed serial-to-parallel conversion in space-constrained TSSOP-14 layouts while meeting industrial temperature (-40°C to +125°C) and ESD robustness (2kV HBM) requirements.

Technical Context

The 74AHC164T14-13 implements a synchronous 8-stage D-type flip-flop chain with asynchronous active-low MR controlling all outputs. Data enters Q0 only on the rising edge of CP, and each stage shifts its value to the next output (Q_n → Q_n+1) simultaneously.

Its dual serial inputs (DSA and DSB) are internally ANDed, enabling one pin to act as data and the other as enable-or both tied together for single-input operation. Schmitt-trigger inputs ensure reliable signal conditioning across noisy logic environments.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9 mm × 4.5 mm body, 0.65 mm pitch, 1.0 mm height - optimized for automated SMT assembly and thermal performance in dense PCB layouts.

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 SN74AHC595PWR and 74LV164PW,118, the 74AHC164T14-13 offers simpler control (no latch/strobe), lower gate count, and guaranteed Schmitt-trigger noise immunity-making it optimal for cost-sensitive, noise-prone, or minimal-pin-count designs where output latching isn't needed.

Availability

74AHC164T14-13 is available at Aetrix Electronics and suitable for LED display driver modules, PC peripheral expansion boards, and set-top box IR subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC164T14-13 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 manufacturer of discrete semiconductors and integrated circuits, specializing in high-reliability, low-power, and application-optimized components for industrial, computing, and consumer markets.

The 74AHC164 belongs to Diodes' AHC logic family-designed for high-speed, low-noise serial data conversion in space-constrained, mixed-voltage embedded systems with stringent ESD and thermal requirements.

FAQ

Can the 74AHC164T14-13 operate reliably at 1.8V?

No. The 74AHC164T14-13 has a minimum recommended V_CC of 2.0V per DS36281 Rev. 2–2. At 1.8V, VIH thresholds fall outside specification (VIH min = 1.5V at 2.0V, scaling nonlinearly), and propagation delay increases beyond guaranteed limits. For 1.8V operation, consider the 74LV164 or 74LVC164 families instead.

What happens if both DSA and DSB are left floating?

Leaving either DSA or DSB unconnected violates the recommended operating condition that unused inputs be tied to V_CC or GND. Floating inputs may oscillate due to noise, causing unintended data entry or increased ICC. Diodes Incorporated specifies tying unused inputs to V_CC to ensure stable LOW output on the ANDed path and prevent metastability.

Is the MR pin truly asynchronous, and does it affect CP timing?

Yes. MR is fully asynchronous: asserting MR LOW immediately forces Q0–Q7 to LOW regardless of CP state or timing. However, DS36281 specifies a 2.5 ns minimum MR HIGH recovery time before the next CP rising edge to guarantee proper internal state restoration-this is not CP timing violation but a setup requirement for reliable post-reset shifting.

Does the TSSOP-14 package require special PCB layout considerations?

Yes. Per Diodes' AP02001 guidelines, the TSSOP-14 pad layout requires 0.45 mm X (width), 1.45 mm Y (length), 5.9 mm C1 (center-to-center), and 0.65 mm C2 (pitch). Thermal relief vias under the exposed pad (if present) and 10–20 mil solder mask dams are recommended to prevent tombstoning during reflow.