Diodes Incorporated 74AHC594S16-13

Overview

74AHC594S16-13 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 5.5V, delivers 8mA output drive at 4.5V, and features Schmitt-trigger inputs for noise immunity. Used in microcontroller I/O expansion to drive LEDs, relays, or displays via single serial line.

For engineers reviewing the 74AHC594S16-13 datasheet, 74AHC594S16-13 pinout, 74AHC594S16-13 application, or 74AHC594S16-13 equivalent, key selection criteria include dual asynchronous reset (SHR/STR), Q7S cascading output, push-pull outputs with 8mA sink/source capability, and guaranteed operation from -40°C to +125°C ambient.

Technical Context

The device implements two synchronized but independent 8-bit registers: a serial-input shift register clocked by SHCP and a parallel-output storage register clocked by STCP. Data transfers from shift to storage register on rising edge of STCP, while Q7S enables daisy-chaining across multiple devices without external logic.

All registers capture data on rising clock edges and update outputs on falling edges. When SHCP and STCP are tied together, the shift register leads the storage register by exactly one clock cycle - enabling continuous streaming with deterministic latency alignment between input and output stages.

Key Specifications

Pinout & Package

74AHC594S16-13 is housed in a 16-pin SOIC (SO-16) package with standard 1.27mm pitch, 10.0mm × 4.0mm body, and 1.5mm max height - compatible with automated SMT placement and reflow profiles per IPC-7351B.

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 SN74HC595DR and 74LV595PW, the 74AHC594S16-13 uniquely provides dual asynchronous resets and Schmitt-trigger inputs - making it the only choice for industrial systems demanding deterministic output behavior and robust signal integrity in mixed-voltage, high-noise settings.

Availability

74AHC594S16-13 is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, and appliance control panels requiring stable component supply across extended product lifecycles.

Supply support for 74AHC594S16-13 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 components for industrial, automotive, and computing markets.

The 74AHC594 belongs to Diodes' AHC logic family - engineered for low-power, high-speed operation across wide voltage and temperature ranges, targeting embedded control and interface applications.

FAQ

Can 74AHC594S16-13 operate reliably at 2.0V supply?

Yes. The device is fully specified down to 2.0V: propagation delays remain within 150ns (max), output drive sustains ±2.5mA, and input thresholds scale correctly. This enables direct use with single-cell LiFePO₄ batteries (2.5–3.6V) and energy-harvesting systems without voltage boosting.

What happens if SHR and STR are asserted simultaneously?

Both shift and storage registers reset to zero independently and immediately - Q0–Q7 go low, and internal shift stages clear. Outputs remain stable during reset; no glitches occur because reset is asynchronous and overrides clock edges. This behavior is verified across -40°C to +125°C.

Is Q7S output buffered or open-drain?

Q7S is a fully buffered push-pull CMOS output - capable of sourcing/sinking 8mA at 4.5V. It matches the electrical characteristics of Q0–Q7 and can directly drive the DS pin of another 74AHC594 without series resistance or level-shifting.

How does the 74AHC594 handle setup/hold timing when SHCP and STCP share a clock source?

When SHCP and STCP are tied, the internal architecture guarantees tSU(DS→SHCP) ≥ 3.0ns and tH(DS→SHCP) ≥ 2.0ns at 4.5–5.5V - meeting typical MCU SPI timing. The shift register always advances one bit ahead of the storage register, enabling continuous data flow without pipeline stalls.