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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

NXP Semiconductors 74LVT574D,118

Name: 74LVT574D,118
Brand: NXP Semiconductors
SKU: 74LVT574D,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT574D,118

Manufacturer:: NXP Semiconductors

Category:: Flip Flops

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74LVT574D,118.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SO

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Product details

Overview

74LVT574D,118 from NXP Semiconductors is a 3.3 V octal D-type flip-flop with 3-state outputs, edge-triggered by a rising clock (CP), and independently controlled output enable (OE). It provides 8-bit registered data latching and bus-isolated output driving for microprocessor data buses, with propagation delays as low as 1.7 ns (t_PLH) at 3.3 V and operation across −40 °C to +85 °C.

For engineers reviewing the 74LVT574D,118 datasheet, 74LVT574D,118 pinout, 74LVT574D,118 application, or 74LVT574D,118 equivalent, this device serves as a high-speed, TTL-level-compatible register for 3.3 V system interfacing - especially where bus hold inputs, live insertion, and 5 V-tolerant I/O simplify legacy-to-modern bus bridging without external pull-ups.

Technical Context

The 74LVT574D,118 implements eight independent D-type flip-flops synchronized to the rising edge of CP, each capturing the state of its Dn input one setup time before the clock transition. Its 3-state outputs are jointly controlled by OE (active LOW), enabling simultaneous bus release without clock dependency.

It features bus hold circuitry on all data inputs (D0–D7), eliminating external pull-up resistors for unused inputs, and supports live insertion/extraction with power-up 3-state and latch-up protection per JESD78 Class II (>500 mA). Input and output levels comply with TTL thresholds while operating from a 2.7–3.6 V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage (V_CC)	2.7 V to 3.6 V - ensures compatibility with 3.3 V logic systems and tolerance to rail variation in industrial environments.
Propagation delay (t_PLH/t_PHL)	1.7–5.9 ns - enables reliable operation up to 150 MHz clock frequency in high-speed data capture paths.
Output drive (I_OL/I_OH)	±32 mA - sufficient to drive heavily loaded 3-state buses, MOS memories, and microprocessor data lines.
Input voltage range (V_I)	0 V to 5.5 V - allows direct interface to 5 V systems without level shifters.
Operating temperature	−40 °C to +85 °C - qualified for industrial-grade embedded control and communications equipment.
Bus hold current	±75 µA to ±150 µA - actively maintains valid logic states on floating D inputs, removing need for external biasing.
Power-up behavior	3-state and reset - prevents bus contention during power ramp-up, critical for hot-swap and modular backplane designs.

Pinout & Package

74LVT574D,118 is housed in a plastic small outline package (SO20) with 20 leads and 7.5 mm body width (SOT163-1), optimized for surface-mount assembly and thermal performance in dense PCB layouts.

Pin	Circuit Role	Design Meaning
1 (OE)	Output enable input	Active LOW global control for all eight 3-state outputs; independent of clock, enabling immediate bus release.
2–9 (D0–D7)	Data inputs	Asynchronous inputs with integrated bus hold - retain last valid logic state when un-driven, eliminating external pull resistors.
10 (GND)	Ground reference	0 V return path for all internal logic and output drivers; must be low-impedance for signal integrity.
11 (CP)	Clock pulse input	Rising-edge-triggered synchronous control; data sampled one setup time before transition (t_su = 2.0 ns min at 3.3 V).
12–19 (Q0–Q7)	Data outputs	3-state buffered outputs; driven HIGH/LOW when OE = LOW, high-impedance when OE = HIGH.
20 (V_CC)	Supply voltage	3.3 V nominal power rail; decoupling capacitor required near pin to suppress switching noise.

Key Features

Feature	Design Value
TTL-compatible I/O	Meets standard TTL voltage thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) while operating from 3.3 V supply - simplifies integration into mixed-voltage systems.
Bus hold inputs	Internal weak pull-up/pull-down on D0–D7 eliminates need for external resistors on unused or unterminated data lines, reducing BOM count and board space.
Live insertion support	Power-up 3-state and robust ESD protection (HBM >2000 V, MM >200 V) allow safe hot-plug operation in modular backplanes and field-replaceable units.
5 V-tolerant inputs	All inputs accept up to 5.5 V regardless of V_CC, enabling direct connection to legacy 5 V peripherals without level translation.
Latch-up immunity	JESD78 Class II rated (>500 mA) - prevents destructive latch-up under transient overvoltage or ground bounce conditions in noisy industrial environments.

Applications

Microprocessor Data Bus Interface	Industrial PLC I/O Expansion
Use Scenario: Interfacing an ARM Cortex-M4 MCU's 32-bit data bus to legacy 8-bit peripheral modules via multiplexed address/data lanes. IC Role / Device Role / Timing Role: Acts as an 8-bit registered latch synchronizing peripheral read/write transfers with the MCU's clock domain, isolating bus segments during arbitration. Use Value: Enables deterministic timing with t_su = 2.0 ns and t_PHL ≤ 5.9 ns, while bus hold inputs prevent glitches on unselected peripherals.	Use Scenario: Adding isolated digital input channels to a DIN-rail mounted PLC base unit handling 24 V sensor signals through optocoupled front-end stages. IC Role / Device Role / Timing Role: Buffers and registers conditioned 3.3 V logic outputs from isolation ICs before routing to the main controller's parallel GPIO port. Use Value: 3-state outputs permit shared bus access among multiple I/O modules; −40 °C to +85 °C rating ensures reliability in uncontrolled cabinet environments.
Memory Address Latching	Test Equipment Signal Conditioning
Use Scenario: Capturing upper address bits from a microcontroller to drive a 16-bit SRAM chip requiring stable address setup before write enable assertion. IC Role / Device Role / Timing Role: Provides edge-triggered registration of A8–A15 signals, decoupling address generation timing from memory access cycles. Use Value: Propagation delay <5.4 ns and setup time <2.4 ns at 2.7 V guarantee timing margin for 150 MHz operation, even under worst-case voltage/temperature.	Use Scenario: Conditioning parallel trigger and status signals between FPGA-based pattern generators and analog front-end boards in automated test systems. IC Role / Device Role / Timing Role: Synchronizes asynchronous status flags (e.g., "ready", "error") to the system clock domain while providing bus-isolated output drive. Use Value: Live insertion capability allows module replacement without powering down the full rack; 5 V-tolerant inputs accept TTL-level triggers directly from legacy instruments.

Microprocessor Data Bus Interface

Industrial PLC I/O Expansion

Use Scenario: Interfacing an ARM Cortex-M4 MCU's 32-bit data bus to legacy 8-bit peripheral modules via multiplexed address/data lanes.

IC Role / Device Role / Timing Role: Acts as an 8-bit registered latch synchronizing peripheral read/write transfers with the MCU's clock domain, isolating bus segments during arbitration.

Use Value: Enables deterministic timing with t_su = 2.0 ns and t_PHL ≤ 5.9 ns, while bus hold inputs prevent glitches on unselected peripherals.

Use Scenario: Adding isolated digital input channels to a DIN-rail mounted PLC base unit handling 24 V sensor signals through optocoupled front-end stages.

IC Role / Device Role / Timing Role: Buffers and registers conditioned 3.3 V logic outputs from isolation ICs before routing to the main controller's parallel GPIO port.

Use Value: 3-state outputs permit shared bus access among multiple I/O modules; −40 °C to +85 °C rating ensures reliability in uncontrolled cabinet environments.

Memory Address Latching

Test Equipment Signal Conditioning

Use Scenario: Capturing upper address bits from a microcontroller to drive a 16-bit SRAM chip requiring stable address setup before write enable assertion.

IC Role / Device Role / Timing Role: Provides edge-triggered registration of A8–A15 signals, decoupling address generation timing from memory access cycles.

Use Value: Propagation delay <5.4 ns and setup time <2.4 ns at 2.7 V guarantee timing margin for 150 MHz operation, even under worst-case voltage/temperature.

Use Scenario: Conditioning parallel trigger and status signals between FPGA-based pattern generators and analog front-end boards in automated test systems.

IC Role / Device Role / Timing Role: Synchronizes asynchronous status flags (e.g., "ready", "error") to the system clock domain while providing bus-isolated output drive.

Use Value: Live insertion capability allows module replacement without powering down the full rack; 5 V-tolerant inputs accept TTL-level triggers directly from legacy instruments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC574APWR	Lower V_CC range (1.65–3.6 V); no bus hold; 5 V-tolerant inputs only when V_CC ≥ 2.3 V.	Requires external pull-ups on unused D inputs; less suitable for floating-bus scenarios.	Select when cost sensitivity outweighs bus hold requirement and system V_CC may dip below 2.7 V.
74LVTH574D,118	Higher drive strength (±64 mA vs. ±32 mA); identical pinout, package, and logic function.	Better suited for driving longer traces or higher-capacitance buses; otherwise drop-in compatible.	Choose for demanding bus loading or marginal signal integrity; same footprint and layout.

Compared with SN74LVC574APWR, the 74LVT574D,118 offers guaranteed bus hold and wider 5 V input tolerance, simplifying design in mixed-voltage systems; versus 74LVTH574D,118, it trades drive strength for lower power consumption and reduced crosstalk risk in compact layouts.

Availability

74LVT574D,118 is available at Aetrix Electronics and suitable for industrial PLCs, test equipment signal conditioning, microprocessor bus interfacing, and memory address latching requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT574D,118 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in high-performance logic and interface ICs.

The 74LVT574D,118 belongs to NXP's LVT (Low-Voltage TTL) logic family, engineered for seamless migration from 5 V TTL systems to 3.3 V operation while preserving signal integrity, timing predictability, and system-level compatibility.

FAQ

What is the maximum clock frequency supported by the 74LVT574D,118?

The 74LVT574D,118 supports a maximum clock frequency of 150 MHz under recommended operating conditions (V_CC = 3.0 V to 3.6 V). This is derived from its propagation delay specifications (t_PLH/t_PHL ≤ 5.9 ns) and minimum pulse width (t_W = 3.3 ns), ensuring reliable edge-triggered registration in high-speed digital systems. The 74LVT574D,118 achieves this performance while maintaining TTL-compatible voltage thresholds.

Does the 74LVT574D,118 require external pull-up resistors on its data inputs?

No, the 74LVT574D,118 does not require external pull-up resistors on D0–D7 inputs because it integrates bus hold circuitry. This feature actively maintains the last valid logic state on un-driven inputs with ±75 µA to ±150 µA holding current, eliminating floating nodes and reducing BOM complexity. This behavior is confirmed in the Static Characteristics table (IBHL/IBHH parameters) of the official NXP datasheet for 74LVT574D,118.

Can the 74LVT574D,118 safely interface with 5 V logic devices?

Yes, the 74LVT574D,118 supports 5 V-tolerant inputs: its VI rating extends to 5.5 V regardless of V_CC (2.7–3.6 V), allowing direct connection to 5 V TTL outputs without level shifters. However, its outputs swing only to V_CC − 0.1 V (min) in HIGH state, so driving 5 V inputs requires verification of the receiving device's V_IH threshold. This dual-voltage capability is explicitly specified in Table 5 of the 74LVT574D,118 datasheet.

What is the purpose of the active LOW output enable (OE) pin on the 74LVT574D,118?

The OE pin on the 74LVT574D,118 provides independent, clock-asynchronous control of all eight 3-state outputs. When OE = LOW, Q0–Q7 reflect the registered D0–D7 values; when OE = HIGH, outputs enter high-impedance OFF-state - neither driving nor loading the bus. This enables multi-master bus architectures and eliminates contention during data transfer handoffs, a key requirement in microprocessor data bus applications using the 74LVT574D,118.

Is the 74LVT574D,118 suitable for hot-swap or live-insertion applications?

Yes, the 74LVT574D,118 is designed for live insertion and extraction: it features power-up 3-state behavior (outputs remain disabled until V_CC stabilizes), robust ESD protection (HBM >2000 V, MM >200 V), and latch-up immunity per JESD78 Class II (>500 mA). These characteristics prevent bus conflicts and damage during module replacement in backplane systems - a documented capability in the Features and Benefits section of the 74LVT574D,118 product data sheet.

74LVT574D,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74LVT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 150 MHz

Max Propagation Delay @ V, Max CL:: 5.9ns @ 3.3V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 32mA, 64mA

Voltage - Supply:: 2.7V ~ 3.6V

Current - Quiescent (Iq):: 190 µA

Input Capacitance:: 4 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

74LVT574D,118 FAQ

1.How can I place an order for 74LVT574D,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT574D,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74LVT574D,118 reliable?

The price and inventory of 74LVT574D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT574D,118 is usually 5 days.

3.What payment methods are accepted for 74LVT574D,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT574D,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVT574D,118?

74LVT574D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT574D,118 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74LVT574D,118?

For technical support, including 74LVT574D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT574D,118 requirements.

6.How does Aetrix verify that 74LVT574D,118 is sourced from the original manufacturer or authorized distributors?

All 74LVT574D,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LVT574D,118 meets industry standards.

7.What is the process for return or replacement of 74LVT574D,118?

All 74LVT574D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT574D,118, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74LVT574D,118 part is unused and in its original packaging.

Return procedure for 74LVT574D,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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