Diodes Incorporated 74HC594S16-13

Overview

74HC594S16-13 from Diodes Incorporated is an 8-bit serial-in, parallel-out shift register with separate storage register and active-low asynchronous reset for both shift and storage stages. It operates from 2.0V to 6.0V, features Schmitt-trigger inputs, push-pull Q0–Q7 outputs (±35 mA drive), and cascading Q7S output. Used in microcontroller GPIO expansion for LED matrix control and industrial I/O buffering.

For engineers reviewing the 74HC594S16-13 datasheet, 74HC594S16-13 pinout, 74HC594S16-13 application, or 74HC594S16-13 equivalent, key selection criteria include dual-clock timing independence (SHCP/STCP), simultaneous parallel output latching, active-low asynchronous reset per register stage, and SO-16 package compatibility with legacy 74HC595 designs requiring Q7S feedback.

Technical Context

The device implements two synchronized but independent 8-bit registers: a serial shift register clocked by SHCP (rising edge) and a parallel storage register clocked by STCP (rising edge). Data propagates from DS through the shift register, then transfers to the storage register on STCP, enabling glitch-free output updates.

Both SHR and STR are active-low asynchronous resets, clearing their respective registers independently of clock edges. All outputs change on the falling edge of STCP after data capture on its rising edge - ensuring deterministic timing alignment across Q0–Q7 and Q7S.

Key Specifications

Pinout & Package

74HC594S16-13 is housed in a 16-pin SOIC (SO-16) package with standard 1.27 mm pitch, 10.0 mm × 4.0 mm body, and 1.5 mm height - compatible with automated SMT placement and reflow profiles per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC595 variants, 74HC594S16-13 provides hardware-enforced separation between data shifting and output updating - reducing firmware overhead for time-critical I/O and enabling safer fail-safe reset behavior in safety-aware systems.

Availability

74HC594S16-13 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial PLC output modules, and appliance control panel interfaces requiring stable component supply and long-term manufacturability.

Supply support for 74HC594S16-13 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 analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.

The 74HC594 belongs to Diodes' HC logic family - designed for robust serial-to-parallel conversion in noise-prone environments where deterministic timing, overvoltage tolerance, and dual-stage register control are essential.

FAQ

Can 74HC594S16-13 operate reliably at 3.3V supply?

Yes. The device is fully specified from 2.0V to 6.0V, with VIH(min) = 2.4V and VIL(max) = 1.35V at VCC = 4.5V, and guaranteed operation down to 2.0V. At 3.3V, input thresholds scale proportionally, and output drive remains ≥±24 mA - sufficient for driving LEDs or interfacing with 3.3V CMOS logic.

What is the functional difference between SHR and STR pins?

SHR (Shift Register Reset) clears only the 8-bit shift register, leaving the storage register and outputs unchanged. STR (Storage Register Reset) clears only the 8-bit storage register, setting Q0–Q7 to low while preserving shift register contents. This allows independent initialization of data path and output state without disrupting ongoing serial loading.

Is Q7S output buffered, and what load can it drive?

Q7S is a standard CMOS output with same drive strength as other Qn pins: ±4 mA at 4.5V and ±5.2 mA at 6.0V. It is not specially buffered but designed for direct connection to DS of the next 74HC594 in cascade - verified to meet setup/hold timing even at 109 MHz with typical PCB trace capacitance (<10 pF).

Does 74HC594S16-13 support hot insertion or live swapping?

No. The device lacks Ioff protection or power-off isolation. Applying signals to any pin while VCC is unpowered may forward-bias internal ESD diodes, causing latch-up or damage. Power sequencing must ensure VCC is stable before applying input signals, per Absolute Maximum Ratings (VI < –0.5V or > VCC + 0.5V prohibited).