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

Texas Instruments SN74LVTH374DB

Name: SN74LVTH374DB
Brand: Texas Instruments
SKU: SN74LVTH374DB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH374DB

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SN74LVTH374DB.pdf

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

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Product details

Overview

SN74LVTH374DB from Fairchild Semiconductor is a low-voltage octal D-type flip-flop with 3-STATE outputs, designed for bus-oriented applications operating at 3.3V V_CC while interfacing to 5V TTL systems. It features bus-hold inputs (eliminating external pull-ups), ±32mA/64mA output drive capability, and operates across –40°C to +85°C.

For engineers reviewing the SN74LVTH374DB datasheet, SN74LVTH374DB pinout, SN74LVTH374DB application, or SN74LVTH374DB equivalent, this device is selected for high-speed data latching in mixed-voltage digital buses where glitch-free power-up/down behavior, live insertion support, and robust ESD protection (>2000V HBM) are required.

Technical Context

The SN74LVTH374DB implements eight edge-triggered D-type flip-flops sharing a common buffered clock (CP) and buffered output enable (OE). Data on D0–D7 is latched on the LOW-to-HIGH transition of CP, provided setup (1.5 ns min) and hold (0.8 ns min) times are met. OE controls 3-STATE output state independently of flip-flop contents.

Its bus-hold circuitry maintains stable logic levels on unused D inputs without external resistors, and its BiCMOS process delivers ABT-class speed (160 MHz max clock frequency) with LVT-class power efficiency (ICCL = 5 mA typical at 3.6V with outputs LOW).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7V to 3.6V - Ensures compatibility with 3.3V logic systems while tolerating supply variation.
f_MAX	160 MHz - Supports high-throughput data capture in fast synchronous buses.
t_PHL/t_PLH	1.8–5.2 ns - Enables precise timing alignment in sub-5ns critical paths.
I_OH/I_OL	–32 mA / +64 mA - Drives heavy capacitive loads or multiple TTL inputs without buffering.
t_S/t_H	1.5 ns / 0.8 ns - Allows tight integration with fast microcontrollers or FPGAs.
ESD HBM	>2000 V - Reduces handling sensitivity during board assembly and field service.
Operating Temp	–40°C to +85°C - Qualified for industrial temperature environments without derating.

Pinout & Package

SN74LVTH374DB is housed in a 20-lead SOIC package (JEDEC MS-013, 0.300" wide), with 1.27 mm lead pitch and gull-wing surface-mount terminals.

Pin/Terminal	Circuit Role	Design Meaning
D0–D7	Data Inputs	Individual asynchronous data inputs for each of eight D-type flip-flops; include bus-hold circuitry.
CP	Clock Pulse Input	Buffered edge-sensitive input; latches Dn on LOW-to-HIGH transition.
OE	Output Enable Input	Active-LOW control for 3-STATE outputs; does not affect internal flip-flop state.
O0–O7	3-STATE Outputs	True-level outputs; high-impedance when OE = HIGH, driven HIGH/LOW when OE = LOW.
V_CC	Power Supply	3.3V nominal supply pin; supports 2.7–3.6V operation with full AC/DC specs.
GND	Ground Reference	Common return path for all signals and power; decoupling recommended near pin 10.

Key Features

Feature	Design Value
Bus-hold inputs	Eliminates need for external pull-up/pull-down resistors on unused D inputs, reducing BOM count and layout area.
Live insertion/extraction support	Enables hot-swap capability in backplane or modular systems without damaging the device or bus.
Power-up/down high-impedance	Prevents bus contention during power sequencing by holding outputs in 3-STATE until V_CC stabilizes.
TTL interface at 5V	Accepts 5V-tolerant inputs (VI up to 5.5V) while operating from 3.3V supply, enabling mixed-voltage interconnect.
Latch-up immunity	Exceeds 500 mA per JEDEC JESD78, ensuring robustness against transient current faults.

Applications

Industrial PLC Backplanes	Network Switch Data Buffers
Use Scenario: Latching parallel status signals from I/O modules onto a shared backplane bus under real-time control. IC Role / Device Role / Timing Role: Octal D-type latch synchronizing asynchronous sensor inputs to a system clock domain before transmission. Use Value: Bus-hold prevents floating inputs during module insertion/removal; 3-STATE enables bidirectional bus arbitration without external logic.	Use Scenario: Temporarily storing packet header bits between MAC and PHY layers in Gigabit Ethernet switch ASIC interfaces. IC Role / Device Role / Timing Role: High-speed data register aligning parallel control words to pipeline stages with minimal skew. Use Value: 160 MHz max clock frequency and sub-5 ns propagation delay meet timing closure for 1 Gbps link layer handshaking.
Automotive Body Control Modules	Test Equipment Digital Pattern Generators
Use Scenario: Capturing door lock, window, and lighting status signals from distributed sensors before CAN message framing. IC Role / Device Role / Timing Role: Level-shifting latch converting 5V sensor outputs to 3.3V MCU-compatible data with noise-immune bus-hold. Use Value: 5.5V-tolerant inputs interface directly to legacy 5V automotive sensors; –40°C to +85°C rating ensures under-hood reliability.	Use Scenario: Generating repeatable multi-bit stimulus patterns for IC functional testing using FPGA-controlled parallel ports. IC Role / Device Role / Timing Role: Synchronized output register driving 8-bit test vectors onto DUT pins with precise edge alignment. Use Value: ±32mA/64mA drive strength drives long PCB traces or multiple DUT inputs without signal degradation.

Industrial PLC Backplanes

Network Switch Data Buffers

Use Scenario: Latching parallel status signals from I/O modules onto a shared backplane bus under real-time control.

IC Role / Device Role / Timing Role: Octal D-type latch synchronizing asynchronous sensor inputs to a system clock domain before transmission.

Use Value: Bus-hold prevents floating inputs during module insertion/removal; 3-STATE enables bidirectional bus arbitration without external logic.

Use Scenario: Temporarily storing packet header bits between MAC and PHY layers in Gigabit Ethernet switch ASIC interfaces.

IC Role / Device Role / Timing Role: High-speed data register aligning parallel control words to pipeline stages with minimal skew.

Use Value: 160 MHz max clock frequency and sub-5 ns propagation delay meet timing closure for 1 Gbps link layer handshaking.

Automotive Body Control Modules

Test Equipment Digital Pattern Generators

Use Scenario: Capturing door lock, window, and lighting status signals from distributed sensors before CAN message framing.

IC Role / Device Role / Timing Role: Level-shifting latch converting 5V sensor outputs to 3.3V MCU-compatible data with noise-immune bus-hold.

Use Value: 5.5V-tolerant inputs interface directly to legacy 5V automotive sensors; –40°C to +85°C rating ensures under-hood reliability.

Use Scenario: Generating repeatable multi-bit stimulus patterns for IC functional testing using FPGA-controlled parallel ports.

IC Role / Device Role / Timing Role: Synchronized output register driving 8-bit test vectors onto DUT pins with precise edge alignment.

Use Value: ±32mA/64mA drive strength drives long PCB traces or multiple DUT inputs without signal degradation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVT374WM	No bus-hold inputs; requires external pull-up resistors on unused D lines.	Suitable where input states are always driven or where board space allows discrete resistors.	Select when cost reduction outweighs layout simplification and bus-hold reliability benefits.
SN74ALVTH374PWR	Lower V_CC range (2.3V–3.6V); higher speed (200 MHz f_MAX); TSSOP-20 package.	Better suited for ultra-low-voltage or space-constrained designs requiring faster timing margins.	Choose when migrating to 2.5V systems or needing enhanced performance in compact layouts.

Compared with SN74LVTH374DB, the 74LVT374WM lacks bus-hold and demands external biasing, while the SN74ALVTH374PWR extends voltage flexibility and speed but changes footprint-neither is pin-compatible, requiring PCB revision for substitution.

Availability

SN74LVTH374DB is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, automotive body electronics, and test equipment requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVTH374DB 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

Fairchild Semiconductor was a U.S.-based analog and power semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed and supported.

The SN74LVTH374DB belongs to Fairchild's LVT/H series of low-voltage TTL-compatible logic devices, engineered for high-speed, low-power bus interfacing in mixed-voltage digital systems.

FAQ

What is the maximum clock frequency supported by SN74LVTH374DB?

The SN74LVTH374DB supports a maximum clock frequency of 160 MHz under recommended operating conditions (V_CC = 3.3V ± 0.3V, T_A = –40°C to +85°C, C_L = 50 pF). This specification is guaranteed across temperature and voltage ranges and applies to the SOIC package variant. The SN74LVTH374DB achieves this speed using an advanced BiCMOS process that balances propagation delay and power consumption.

Does SN74LVTH374DB support 5V-tolerant inputs?

Yes, SN74LVTH374DB supports 5V-tolerant inputs: its VI rating extends to 5.5V, allowing direct connection to 5V TTL outputs while operating from a 3.3V supply. This eliminates level-shifter requirements in mixed-voltage systems. Input clamp diodes and robust ESD structures ensure safe operation even with sustained 5V input signals, as confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables.

How does the bus-hold feature function in SN74LVTH374DB?

The bus-hold circuitry in SN74LVTH374DB actively maintains the last valid logic state on each D input when no external driver is present, eliminating the need for external pull-up or pull-down resistors. It draws ±75 µA minimum drive current at 3.0V to retain state and requires ±500 µA over-drive to change state-ensuring noise immunity and reliable operation during hot-swap or unconnected input conditions.

What is the output drive capability of SN74LVTH374DB?

SN74LVTH374DB provides asymmetric output drive: –32 mA for HIGH-level sourcing and +64 mA for LOW-level sinking. This supports driving multiple TTL inputs or heavier capacitive loads (e.g., long traces or unterminated stubs) without external buffers. Drive strength is specified at V_CC = 3.0V and validated across the full operating temperature range.

Is SN74LVTH374DB compatible with standard 74-series 374 logic?

Yes, SN74LVTH374DB is functionally compatible with the standard 74 series 374, replicating the same truth table, pinout, and basic timing behavior. However, it operates at 3.3V with 5V-tolerant inputs and adds bus-hold functionality-differences that require validation in legacy 5V-only designs but enable seamless integration into modern low-voltage systems with backward interface capability.

SN74LVTH374DB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

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Number of Elements:: -

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Clock Frequency:: -

Max Propagation Delay @ V, Max CL:: -

Trigger Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Current - Quiescent (Iq):: -

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SN74LVTH374DB FAQ

1.How can I place an order for SN74LVTH374DB through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH374DB 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 SN74LVTH374DB reliable?

The price and inventory of SN74LVTH374DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH374DB is usually 5 days.

3.What payment methods are accepted for SN74LVTH374DB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH374DB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH374DB?

SN74LVTH374DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH374DB 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 SN74LVTH374DB?

For technical support, including SN74LVTH374DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH374DB requirements.

6.How does Aetrix verify that SN74LVTH374DB is sourced from the original manufacturer or authorized distributors?

All SN74LVTH374DB 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 SN74LVTH374DB meets industry standards.

7.What is the process for return or replacement of SN74LVTH374DB?

All SN74LVTH374DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH374DB, 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 SN74LVTH374DB part is unused and in its original packaging.

Return procedure for SN74LVTH374DB:

1.Submit a request within 90 days.

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

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