Diodes Incorporated 74AHC594T16-13

Overview

74AHC594T16-13 from Diodes Incorporated is an 8-bit serial-in, parallel-out shift register with separate storage register and dual active-low reset (SHR, STR), operating from 2.0V to 5.5V supply, delivering 8mA output drive at 4.5V, and supporting up to 125MHz shift clock frequency at 3.3V - used in microcontroller GPIO expansion for LED matrix control.

For engineers reviewing the 74AHC594T16-13 datasheet, 74AHC594T16-13 pinout, 74AHC594T16-13 application, or 74AHC594T16-13 equivalent, key selection criteria include independent shift/storage register clocks (SHCP/STCP), Q7S cascading output, Schmitt-trigger inputs for noise immunity, and TSSOP-16 package compatibility with high-density PCB layouts.

Technical Context

The device implements two synchronized but independently clocked 8-bit registers: a serial-input shift register (clocked by SHCP) and a parallel-output storage register (clocked by STCP), enabling asynchronous data latching. Both SHR and STR provide asynchronous, clock-independent reset to logic low.

All inputs feature Schmitt-trigger action for robust noise rejection, and outputs are push-pull with rail-to-rail swing. The Q7S serial output allows daisy-chaining multiple devices without external logic, while propagation delays (e.g., SHCP→Q7S: 3.8ns typ @ 5V) ensure timing-critical synchronous operation.

Key Specifications

Pinout & Package

TSSOP-16 surface-mount package (4.9 mm × 6.4 mm, 0.65 mm pitch), optimized for automated placement and thermal performance in compact PCBs.

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 SN74HC595PWR and 74LV595PW,118, the 74AHC594T16-13 uniquely provides isolated asynchronous reset for shift and storage domains plus higher speed and drive - critical for fault-tolerant and high-throughput applications.

Availability

74AHC594T16-13 is available at Aetrix Electronics and suitable for LED matrix driver designs, industrial I/O expansion modules, microcontroller GPIO extender boards, and automated test fixture sequencers requiring stable component supply across extended production lifecycles.

Supply support for 74AHC594T16-13 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, industry-qualified components for automotive, industrial, and computing markets.

The 74AHC logic family targets high-speed, low-power, mixed-voltage system interfacing - designed specifically for robust serial-to-parallel conversion in noise-prone embedded control environments.

FAQ

Can 74AHC594T16-13 operate reliably at 2.0V supply?

Yes - it is fully specified down to 2.0V with guaranteed VIH/VIL thresholds, 125 MHz maximum frequency at 3.3V, and 8mA output drive at 4.5V. At 2.0V, fMAX drops to 80 MHz, and VOL remains ≤0.1V with IOL = 50μA, making it suitable for battery-powered 2.0V systems requiring moderate speed.

What is the function of Q7S versus Q7 in this device?

Q7 is the parallel output of the 8th stage of the storage register and drives external loads directly. Q7S is the serial output of the 8th stage of the *shift* register - it carries the bit shifted out after each SHCP pulse and connects to the DS input of the next device in a cascade, enabling multi-byte shift chains without external wiring logic.

How do SHR and STR interact when both are asserted low?

SHR resets only the 8-bit shift register (stages 0–7), setting all internal bits to zero; STR resets only the 8-bit storage register, forcing Q0–Q7 to logic low. They operate independently - asserting both simultaneously clears both registers, but neither affects the other's state, enabling selective initialization in complex sequencing workflows.

Is the TSSOP-16 package RoHS-compliant and lead-free?

Yes - the 74AHC594T16-13 is fully RoHS 2 compliant (2011/65/EU), totally lead-free, halogen-free, and antimony-free per Diodes Incorporated's "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb), with no purposely added lead and certified per JESD22-A112 and JESD22-A114.