onsemi NLV74HC589ADG

Overview

NLV74HC589ADG from onsemi is an 8-bit serial/parallel-input, serial-output shift register with 3-state output, designed for bus-oriented digital systems. It integrates an 8-bit data latch and 8-bit shift register, operates from 2.0 V to 6.0 V, supports SPI interface compatibility, and delivers 15 LSTTL load drive capability.

For engineers reviewing the NLV74HC589ADG datasheet, pinout, applications, or equivalent options, this device serves as a configurable data serialization and parallel-to-serial conversion solution in microcontroller peripheral expansion, LED matrix control, and industrial I/O buffering where 3-state bus sharing is required.

Technical Context

The NLV74HC589ADG implements dual-stage logic: an edge-triggered 8-bit parallel data latch (loaded on rising Latch Clock) feeds into an 8-bit shift register (shifted on rising Shift Clock). Serial Shift/Parallel Load controls mode selection-high enables serial shifting, low enables parallel loading from the latch.

Its QH output is actively 3-state controlled by Output Enable (active-low), enabling direct connection to shared data buses. The device uses high-performance silicon-gate CMOS technology, ensuring compatibility with TTL, NMOS, and CMOS logic families across its full 2.0–6.0 V supply range.

Key Specifications

Pinout & Package

Package: SOIC-16 (Case 751B), 9.90 mm × 3.90 mm × 1.37 mm, 1.27 mm pitch, Pb-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC165PWR and MC74HC165ADG, the NLV74HC589ADG uniquely integrates 3-state output control and dual-mode operation (serial shift vs. parallel load) in one SOIC-16 package, eliminating external components for bus-shared serial data acquisition.

Availability

NLV74HC589ADG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded display interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.

Supply support for NLV74HC589ADG 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

onsemi is a global semiconductor manufacturer specializing in energy-efficient, high-reliability silicon solutions for automotive, industrial, cloud, and IoT applications.

The NLV74HC589ADG belongs to onsemi's HC logic family, engineered for robust operation in harsh environments with extended temperature range, low power consumption, and interoperability across mixed-voltage digital systems.

FAQ

What is the maximum operating frequency of the NLV74HC589ADG?

The NLV74HC589ADG supports a maximum clock frequency of 35 MHz at VCC = 6.0 V, as specified in the AC Electrical Characteristics table. At lower supply voltages (e.g., 3.0 V), the max frequency reduces to 24 MHz. These values assume 50% duty cycle and proper signal integrity - actual system-level timing must account for propagation delays, setup/hold times, and PCB trace effects. The NLV74HC589ADG datasheet defines fmax under standardized test conditions using CL = 50 pF and RL = 1 kΩ.

Does the NLV74HC589ADG support true bidirectional data flow?

No, the NLV74HC589ADG is unidirectional: it accepts parallel or serial data input and produces serial output only at QH. It does not support serial data input from QH or reverse shifting. Its architecture is strictly parallel-in/serial-out (PISO) with no feedback path or input capability on the QH pin. For bidirectional shift registers, consider devices such as the 74HC299 or 74HC194, which explicitly define dual-directional shift functionality.

Can the NLV74HC589ADG operate reliably at 2.0 V supply voltage?

Yes, the NLV74HC589ADG is fully specified down to 2.0 V supply voltage per the Recommended Operating Conditions table. At 2.0 V, it guarantees 6.0 MHz maximum clock frequency, 175 ns max propagation delay, and valid VIH/VIL thresholds (1.5 V and 0.5 V respectively). Input leakage remains ≤ ±1.0 µA, and output drive meets 15 LSTTL load capability. This makes the NLV74HC589ADG suitable for ultra-low-power battery-operated systems where 2.0–2.5 V operation is required.

How does the Serial Shift/Parallel Load pin affect internal register behavior in the NLV74HC589ADG?

In the NLV74HC589ADG, the Serial Shift/Parallel Load pin (Pin 13) determines functional mode: when low, it enables parallel loading of A–H data into both the latch and shift register simultaneously; when high, it enables serial shifting of SA data into the shift register while preserving latch contents. Critically, the pin does not gate the Latch Clock or Shift Clock - those remain active regardless of mode. This allows independent control of data capture and serialization timing, enabling pipelined operation where new parallel data is loaded while previous data is shifted out.

Is the NLV74HC589ADG pin-compatible with the standard MC74HC589ADG?

Yes, the NLV74HC589ADG is pin-compatible and functionally identical to the MC74HC589ADG, differing only in temperature grade and qualification: NLV denotes −55 °C to +125 °C operation with automotive-grade screening (AEC-Q100 qualified), whereas MC grade is rated for −40 °C to +85 °C. Both share identical SOIC-16 pinout, electrical specifications, timing behavior, and logic function - making NLV74HC589ADG a direct replacement in high-reliability or extended-temperature applications without PCB or firmware changes.