Nexperia USA Inc. 74LVC574APW/S400,1

Overview

74LVC574APW/S400,1 from Nexperia is an octal positive-edge-triggered D-type flip-flop with 3-state outputs, 5 V tolerant I/O, and IOFF partial power-down protection. It operates from 1.2 V to 3.6 V supply, supports mixed-voltage translation between 3.3 V and 5 V systems, and features Schmitt-trigger inputs for noise immunity. Used in bus interface latching, data buffering, and level-shifting applications in industrial control and embedded peripherals.

For engineers reviewing the 74LVC574APW/S400,1 datasheet, 74LVC574APW/S400,1 pinout, 74LVC574APW/S400,1 application, or 74LVC574APW/S400,1 equivalent, this device delivers deterministic edge-triggered register behavior, precise timing margins (tsu = 2.0 ns, th = +1.5 ns at 3.3 V), and robust 5.5 V overvoltage tolerance on all inputs/outputs - critical for interoperability in heterogeneous voltage domains.

Technical Context

The 74LVC574APW/S400,1 implements eight independent D-type flip-flops synchronized to the rising edge of CP, with asynchronous 3-state control via active-low OE. Its IOFF circuitry disables outputs and blocks backflow current when VCC = 0 V, enabling safe hot-insertion and partial power-down operation in multi-rail systems.

Each input includes Schmitt-trigger action for reliable operation with slow or noisy signals, and all I/O pins tolerate up to 5.5 V regardless of VCC level - enabling direct connection to legacy 5 V logic without external level shifters. The device complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across its full 1.2 V–3.6 V operating range.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74LVC574APWR, the 74LVC574APW/S400,1 offers tighter timing (1.5 ns min tpd) and essential IOFF protection; versus 74LVCH574APW, it trades bus-hold capability for lower static current and simpler input biasing - making it optimal for cost-sensitive, high-speed, mixed-voltage latching where inputs are always driven.

Availability

74LVC574APW/S400,1 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, test equipment, and medical imaging interfaces requiring stable component supply, long-term lifecycle assurance, and guaranteed RoHS-compliant sourcing.

Supply support for 74LVC574APW/S400,1 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

Nexperia is a global semiconductor expert delivering high-performance, reliable, and energy-efficient logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVC574APW/S400,1 belongs to Nexperia's LVC logic family - engineered for low-voltage operation, mixed-voltage interoperability, and robustness in demanding industrial and automotive environments.

FAQ

Can 74LVC574APW/S400,1 operate with a 1.2 V supply and still accept 5 V inputs?

Yes. The device is fully specified from 1.2 V to 3.6 V supply and supports 5.5 V tolerant inputs across that entire range. Input clamping diodes and internal protection circuitry allow safe operation even when VI exceeds VCC by up to 2.3 V, enabling true level translation without external components.

What is the purpose of the IOFF feature, and how does it behave during power-down?

IOFF disables the output drivers and blocks current flow when VCC = 0 V, preventing back-current from externally driven I/O lines into the unpowered device. This protects downstream circuitry and avoids unintended power-up of other rails - critical for hot-swap, power sequencing, and battery-backed systems.

Does the 74LVC574APW/S400,1 require external pull-up or pull-down resistors on unused inputs?

No. All inputs include Schmitt-trigger action and internal weak pull-downs (typical 100 kΩ) sufficient to prevent floating states. However, for highest noise immunity in high-EMI environments, external 10 kΩ pull-downs are recommended - especially on OE and CP in systems with long traces or unconnected test points.

How does the 3-state output behavior interact with the internal register state when OE is asserted?

Asserting OE (LOW) forces Q0–Q7 into high-impedance mode without altering the stored data in the internal flip-flops. The register retains its last captured value, and outputs immediately resume driving that value upon OE deassertion (HIGH), ensuring glitch-free bus re-engagement and deterministic state recovery.