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

Texas Instruments SN74LVTH574NS

Name: SN74LVTH574NS
Brand: Texas Instruments
SKU: SN74LVTH574NS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH574NS

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SN74LVTH574NS.pdf

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

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Product details

Overview

SN74LVTH574NS from NXP Semiconductors is an 8-bit edge-triggered D-type flip-flop with 3-state outputs, designed for 3.3 V operation. It features independent clock (CP) and active-low output enable (OE), TTL-compatible input/output levels, bus-hold inputs, and operates across −40 °C to +85 °C - used in data latching and bus isolation for microprocessor address/data buses.

For engineers reviewing the SN74LVTH574NS datasheet, SN74LVTH574NS pinout, SN74LVTH574NS application, or SN74LVTH574NS equivalent, key selection criteria include 3-state drive capability (±32 mA), propagation delay (≤5.9 ns at 3.0–3.6 V), setup/hold timing (2.4 ns / 0 ns at 2.7 V), bus-hold functionality, and SO20 package compatibility with legacy 74-series layouts.

Technical Context

This device implements eight independent D-type latches triggered on the rising edge of CP, each feeding a high-drive 3-state buffer controlled collectively by OE. The bus-hold circuitry maintains valid logic states on unused D inputs without external pull-ups, enabling robust operation in floating-bus environments.

It supports mixed-voltage interfacing: inputs tolerate up to 5.5 V, outputs drive 3.3 V or 5 V buses with no current loading when tied to 5 V, and features power-up 3-state and latch-up protection per JESD78 Class II (>500 mA). ESD ratings exceed 2000 V HBM and 200 V MM.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.7 V to 3.6 V - ensures stable operation across industrial 3.3 V supply tolerances.
Output Drive	±32 mA (IOL/IOH) - sufficient to drive heavily loaded 3-state buses or MOS memory interfaces.
Propagation Delay	≤5.9 ns (tPHL/tPLH at 2.7 V) - enables reliable operation up to 150 MHz clock frequency.
Setup/Hold Time	2.4 ns setup / 0 ns hold (at 2.7 V) - simplifies timing closure in high-speed synchronous designs.
Bus-Hold Current	±75 µA to ±150 µA - actively retains logic state on unconnected inputs, eliminating external bias resistors.
Operating Temp	−40 °C to +85 °C - qualified for industrial ambient conditions without derating.
ESD Rating	2000 V HBM (JESD22-A114E) - enhances handling robustness during assembly and field service.

Pinout & Package

SN74LVTH574NS is supplied in SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, standard 0.050″ lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low output enable	Global control for all 8 outputs; LOW enables Qn, HIGH places outputs in high-impedance OFF-state.
2–9 (D0–D7)	Data inputs	Asynchronous inputs sampled on rising CP edge; include bus-hold circuitry to retain state when floating.
10 (GND)	Ground reference	0 V return path for all internal logic and output drivers; must be low-impedance for noise immunity.
11 (CP)	Clock pulse input	Rising-edge-triggered register control; requires clean transition (≤10 ns/V slew rate) for reliable sampling.
12–19 (Q0–Q7)	Registered 3-state outputs	Outputs reflect Dn state after CP edge when OE = LOW; tri-stated when OE = HIGH to isolate bus segments.
20 (VCC)	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	Accepts and drives standard TTL logic levels while operating at 3.3 V, enabling seamless interface with legacy 5 V systems.
Bus-hold inputs	Eliminates need for external pull-up/down resistors on D0–D7, reducing BOM count and PCB space in sparse-bus configurations.
Power-up 3-state	Guarantees outputs remain high-impedance during power ramp-up, preventing bus contention at system startup.
Live insertion/extraction	Supports hot-swap capability in backplane or modular systems without damaging connected circuitry.
Latch-up protection	JESD78 Class II rated (>500 mA), ensuring immunity to destructive latch-up under transient overvoltage or ESD events.

Applications

Microprocessor Data Bus Interface	Memory Address Latching
Use Scenario: Isolating and latching bidirectional data between a 32-bit microprocessor and peripheral devices sharing a common bus. IC Role / Device Role / Timing Role: Acts as a registered bus transceiver - captures processor data on CP rising edge and presents it to peripherals only when OE is asserted. Use Value: Enables time-multiplexed bus sharing with deterministic timing, eliminating contention and supporting burst-mode transfers.	Use Scenario: Capturing and holding address signals from a microcontroller driving multiple SRAM or flash memory chips. IC Role / Device Role / Timing Role: Functions as an address latch - freezes address lines during memory access cycles while data is transferred. Use Value: Reduces address bus loading and allows extended memory decode windows, improving timing margin for slower memories.
Industrial PLC I/O Expansion	Digital Signal Acquisition Buffer
Use Scenario: Expanding digital input/output capacity in programmable logic controllers using isolated backplane slots. IC Role / Device Role / Timing Role: Serves as a buffered I/O register - stores control bits from CPU and drives opto-isolated outputs or reads sensor inputs via bus-hold protection. Use Value: Provides noise-immune signal conditioning and eliminates external biasing components on unused I/O lines.	Use Scenario: Interfacing parallel-output ADCs or sensor arrays to FPGA-based acquisition systems requiring synchronized sampling. IC Role / Device Role / Timing Role: Operates as a synchronous sample-and-hold register - captures parallel sensor data on CP edge and holds stable values for FPGA readout. Use Value: Ensures glitch-free data capture with sub-6 ns propagation delay, preserving integrity of fast analog-to-digital conversions.

Microprocessor Data Bus Interface

Memory Address Latching

Use Scenario: Isolating and latching bidirectional data between a 32-bit microprocessor and peripheral devices sharing a common bus.

IC Role / Device Role / Timing Role: Acts as a registered bus transceiver - captures processor data on CP rising edge and presents it to peripherals only when OE is asserted.

Use Value: Enables time-multiplexed bus sharing with deterministic timing, eliminating contention and supporting burst-mode transfers.

Use Scenario: Capturing and holding address signals from a microcontroller driving multiple SRAM or flash memory chips.

IC Role / Device Role / Timing Role: Functions as an address latch - freezes address lines during memory access cycles while data is transferred.

Use Value: Reduces address bus loading and allows extended memory decode windows, improving timing margin for slower memories.

Industrial PLC I/O Expansion

Digital Signal Acquisition Buffer

Use Scenario: Expanding digital input/output capacity in programmable logic controllers using isolated backplane slots.

IC Role / Device Role / Timing Role: Serves as a buffered I/O register - stores control bits from CPU and drives opto-isolated outputs or reads sensor inputs via bus-hold protection.

Use Value: Provides noise-immune signal conditioning and eliminates external biasing components on unused I/O lines.

Use Scenario: Interfacing parallel-output ADCs or sensor arrays to FPGA-based acquisition systems requiring synchronized sampling.

IC Role / Device Role / Timing Role: Operates as a synchronous sample-and-hold register - captures parallel sensor data on CP edge and holds stable values for FPGA readout.

Use Value: Ensures glitch-free data capture with sub-6 ns propagation delay, preserving integrity of fast analog-to-digital conversions.

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
SN74LVC574PWR	Lower drive (±24 mA), no bus-hold, 1.65–3.6 V VCC range	Suitable for lower-power, single-supply 3.3 V systems without floating inputs	Choose when bus-hold is unnecessary and tighter supply tolerance is acceptable.
74ALVC574MTCX	Higher speed (tPD ≤ 3.8 ns), same VCC range, no bus-hold	Better for >200 MHz clock domains where timing margin is critical	Select when maximum propagation performance is prioritized over input biasing convenience.

Compared with SN74LVTH574NS, SN74LVC574PWR reduces drive strength and omits bus-hold but extends low-VCC operation; 74ALVC574MTCX improves speed significantly but sacrifices input biasing - making SN74LVTH574NS optimal for industrial bus interfaces requiring robust floating-input handling and proven 3.3 V compatibility.

Availability

SN74LVTH574NS is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microprocessor data bus isolation, and memory address latching requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVTH574NS 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in logic, interface, and power management ICs.

The SN74LVTH574NS belongs to NXP's 74LVT/LVTH logic family, engineered for high-speed, low-voltage 3.3 V bus interfacing with enhanced noise immunity and mixed-voltage compatibility.

FAQ

What is the maximum clock frequency supported by SN74LVTH574NS?

SN74LVTH574NS supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.0 V to 3.6 V). This rating is derived from dynamic characterization showing tPLH/tPHL ≤ 5.9 ns at 2.7 V and ≤ 5.4 ns at 3.0–3.6 V, enabling reliable operation in high-speed synchronous bus architectures where SN74LVTH574NS serves as a data latch or pipeline register.

Does SN74LVTH574NS require external pull-up resistors on its D inputs?

No, SN74LVTH574NS does not require external pull-up resistors on D0–D7 inputs due to integrated bus-hold circuitry. This feature maintains valid logic states on floating inputs with ±75 µA to ±150 µA holding current, directly eliminating the need for discrete biasing components and reducing design complexity in sparsely populated bus configurations where SN74LVTH574NS is deployed.

Can SN74LVTH574NS interface with 5 V logic systems?

Yes, SN74LVTH574NS supports mixed-voltage interfacing: its inputs tolerate up to 5.5 V, and its outputs can drive 5 V buses without loading current when tied to 5 V, thanks to TTL-compatible thresholds and open-drain-like behavior in OFF-state. This makes SN74LVTH574NS suitable for bridging 3.3 V microcontrollers to legacy 5 V peripherals without level shifters - a key advantage in retrofit or hybrid-voltage systems.

What is the purpose of the active-low OE pin on SN74LVTH574NS?

The active-low OE (output enable) pin on SN74LVTH574NS provides global 3-state control for all eight Q outputs, independent of the clock. When OE = LOW, registered data appears at Q0–Q7; when OE = HIGH, outputs enter high-impedance OFF-state to electrically isolate the device from the bus - essential for multi-master bus arbitration, hot-swap capability, and preventing contention in shared-data-path applications where SN74LVTH574NS is used as a bus buffer.

Is SN74LVTH574NS qualified for automotive applications?

No, SN74LVTH574NS is not automotive-qualified. Per NXP's legal disclaimers, unless explicitly stated in the datasheet, the device is intended for industrial and commercial use only. It is neither tested nor warranted for AEC-Q100 compliance, temperature extremes beyond −40 °C to +85 °C, or safety-critical functions. For automotive designs requiring SN74LVTH574NS functionality, engineers must select a formally qualified alternative or perform full system-level validation.

SN74LVTH574NS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

Output Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Clock Frequency:: -

Max Propagation Delay @ V, Max CL:: -

Trigger Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Current - Quiescent (Iq):: -

Input Capacitance:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74LVTH574NS FAQ

1.How can I place an order for SN74LVTH574NS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH574NS 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 SN74LVTH574NS reliable?

The price and inventory of SN74LVTH574NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH574NS is usually 5 days.

3.What payment methods are accepted for SN74LVTH574NS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH574NS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH574NS?

SN74LVTH574NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH574NS 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 SN74LVTH574NS?

For technical support, including SN74LVTH574NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH574NS requirements.

6.How does Aetrix verify that SN74LVTH574NS is sourced from the original manufacturer or authorized distributors?

All SN74LVTH574NS 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 SN74LVTH574NS meets industry standards.

7.What is the process for return or replacement of SN74LVTH574NS?

All SN74LVTH574NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH574NS, 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 SN74LVTH574NS part is unused and in its original packaging.

Return procedure for SN74LVTH574NS:

1.Submit a request within 90 days.

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

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