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

Texas Instruments SN74LVTH273DWRG4

Name: SN74LVTH273DWRG4
Brand: Texas Instruments
SKU: SN74LVTH273DWRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH273DWRG4

Manufacturer:: Texas Instruments

Category:: Flip Flops

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

Datasheet:: SN74LVTH273DWRG4.pdf

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

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Product details

Overview

SN74LVTH273DWRG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with direct-clear input, designed for 3.3-V V_CC operation while supporting 5-V TTL-level inputs and outputs. It features bus-hold circuitry on all data inputs, I_off partial-power-down capability, and operates down to 2.7 V. It is used in level-shifting register interfaces in mixed-voltage digital systems such as industrial control backplanes and legacy bus adapters.

For engineers reviewing the SN74LVTH273DWRG4 datasheet, SN74LVTH273DWRG4 pinout, SN74LVTH273DWRG4 application, or SN74LVTH273DWRG4 equivalent, key selection criteria include its 20-pin SSOP package, 150-MHz maximum clock frequency, ±100 µA I_off current, bus-hold input retention, and compatibility with both 3.3-V logic domains and 5-V signal environments.

Technical Context

The SN74LVTH273DWRG4 implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous active-low CLR controlling all Q outputs simultaneously. Its TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and 3.3-V supply allow interoperability between 5-V legacy peripherals and modern low-voltage logic.

Bus-hold circuitry actively maintains valid logic states on undriven D inputs without external resistors, and I_off protection disables outputs during power-down to prevent backflow current. Output drive strength is rated at ±64 mA (I_OL/I_OH) under 3.3-V operation, supporting fanout into multiple CMOS or TTL loads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated battery rails and noisy industrial supplies without regulation
Max Clock Frequency	150 MHz - enables high-speed register staging in data acquisition and protocol bridging
Setup Time (t_su)	2.3 ns - allows tight timing margins when interfacing with fast microcontrollers or FPGAs
I_off	±100 µA - prevents damaging current flow during hot-swap or partial-power-down sequences
Bus-Hold Current	±750 µA (dynamic) - sustains stable input state without pull-up/down resistors, reducing BOM count
Output Drive (I_OL/I_OH)	64 mA / −32 mA - drives multiple 74-series TTL loads or long PCB traces with minimal voltage drop
Propagation Delay (t_PLH/t_PHL)	1.7–4.9 ns - ensures deterministic timing alignment across all eight flip-flops

Pinout & Package

SN74LVTH273DWRG4 is housed in a 20-pin SSOP (Shrink Small Outline Package), DB package, measuring 7.5 mm × 5.6 mm × 1.75 mm (max height), with 0.65-mm lead pitch and RoHS-compliant NiPdAu finish. The package is moisture-sensitive Level-1 (260°C peak reflow) and optimized for automated surface-mount assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Data Inputs (D1–D8)	Asynchronous data sources for each flip-flop; feature integrated bus-hold for floating-state immunity
9	Ground (GND)	Reference return path for all internal logic and output drivers
10	V_CC	3.3-V supply input; must be decoupled locally to suppress switching noise
11–18	Q Outputs (Q1–Q8)	Registered outputs synchronized to CLK↑; capable of driving TTL or CMOS loads directly
19	CLK	Positive-edge-triggered clock input; threshold referenced to V_CC, not fixed voltage
20	CLR	Active-low asynchronous clear; resets all Q outputs to logic low regardless of CLK state

Key Features

Feature	Design Value
Mixed-mode signal interface	Accepts 5-V TTL inputs while operating from 3.3-V V_CC, eliminating external level shifters in hybrid voltage systems
Bus-hold on all D inputs	Eliminates need for 10-kΩ pull-up/down resistors, reducing component count and board space in sparse-bus applications
I_off partial-power-down	Prevents current backflow when V_CC = 0 V, enabling safe insertion/removal in live-backplane systems
Low ground bounce (V_OLP)	<0.8 V at V_CC = 3.3 V - minimizes noise coupling into shared ground planes during simultaneous output switching
Latch-up immunity	>500 mA per JESD 17 - ensures robustness against transient overvoltage events in industrial environments

Applications

Industrial Backplane Interface	Legacy Bus Adapter
Use Scenario: Interfacing a 3.3-V FPGA to a 5-V ISA or VME bus where address/data lines require registered buffering and voltage translation. IC Role / Device Role / Timing Role: Acts as an octal registered level shifter, capturing 5-V signals on CLK↑ and presenting clean 3.3-V outputs to the FPGA fabric. Use Value: Enables direct connection without discrete level shifters or external resistors, reducing latency and layout complexity.	Use Scenario: Adding programmable I/O expansion to a microcontroller-based PLC using a 5-V parallel port standard. IC Role / Device Role / Timing Role: Provides synchronized input capture and output latching with hardware reset (CLR) for deterministic state initialization. Use Value: Guarantees glitch-free data transfer and eliminates metastability risk via controlled edge-triggered sampling.
Automated Test Equipment (ATE) Fixture	Embedded Data Acquisition Module
Use Scenario: Capturing high-speed sensor waveforms from 5-V analog-to-digital converters before digitization by a 3.3-V SoC. IC Role / Device Role / Timing Role: Serves as a synchronous input register, aligning sampled data edges to the system clock domain. Use Value: Reduces setup/hold violations and improves timing margin by 2.3 ns minimum t_su at 150 MHz.	Use Scenario: Buffering and synchronizing status flags from multiple 5-V field devices (e.g., limit switches, relays) into a 3.3-V ARM Cortex-M controller. IC Role / Device Role / Timing Role: Functions as a fault-tolerant input latch with bus-hold, preventing undefined states during cable disconnect or ESD transients. Use Value: Increases system reliability by maintaining valid logic levels on open inputs, avoiding spurious interrupts or false alarms.

Industrial Backplane Interface

Legacy Bus Adapter

Use Scenario: Interfacing a 3.3-V FPGA to a 5-V ISA or VME bus where address/data lines require registered buffering and voltage translation.

IC Role / Device Role / Timing Role: Acts as an octal registered level shifter, capturing 5-V signals on CLK↑ and presenting clean 3.3-V outputs to the FPGA fabric.

Use Value: Enables direct connection without discrete level shifters or external resistors, reducing latency and layout complexity.

Use Scenario: Adding programmable I/O expansion to a microcontroller-based PLC using a 5-V parallel port standard.

IC Role / Device Role / Timing Role: Provides synchronized input capture and output latching with hardware reset (CLR) for deterministic state initialization.

Use Value: Guarantees glitch-free data transfer and eliminates metastability risk via controlled edge-triggered sampling.

Automated Test Equipment (ATE) Fixture

Embedded Data Acquisition Module

Use Scenario: Capturing high-speed sensor waveforms from 5-V analog-to-digital converters before digitization by a 3.3-V SoC.

IC Role / Device Role / Timing Role: Serves as a synchronous input register, aligning sampled data edges to the system clock domain.

Use Value: Reduces setup/hold violations and improves timing margin by 2.3 ns minimum t_su at 150 MHz.

Use Scenario: Buffering and synchronizing status flags from multiple 5-V field devices (e.g., limit switches, relays) into a 3.3-V ARM Cortex-M controller.

IC Role / Device Role / Timing Role: Functions as a fault-tolerant input latch with bus-hold, preventing undefined states during cable disconnect or ESD transients.

Use Value: Increases system reliability by maintaining valid logic levels on open inputs, avoiding spurious interrupts or false alarms.

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
SN74LVC273PW	No bus-hold; requires external pull resistors; lower I_OL (24 mA); 3.3-V only I/O	Suitable for fully 3.3-V systems without 5-V interface needs	Select when cost sensitivity outweighs mixed-voltage support and bus-hold convenience
74ALVC273MTCX	Higher speed (200 MHz); no I_off; no bus-hold; different pinout (TSSOP-20 vs. SSOP-20)	Better for high-frequency clock domains but lacks power-down safety and input retention	Choose only if timing budget demands >150 MHz and system design accommodates external biasing

Compared with SN74LVC273PW and 74ALVC273MTCX, SN74LVTH273DWRG4 uniquely combines 5-V tolerant inputs, bus-hold, and I_off in a single 20-pin SSOP device-making it the only option among the three that safely bridges legacy and modern voltage domains without external components or layout changes.

Availability

SN74LVTH273DWRG4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy bus adapters, automated test equipment fixtures, and embedded data acquisition modules requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74LVTH273DWRG4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience in industrial-grade interface ICs.

The SN74LVTH273 series belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system integration-enabling seamless communication between 3.3-V logic cores and 5-V legacy peripherals in harsh, real-world environments.

FAQ

What is the operating voltage range for SN74LVTH273DWRG4?

The SN74LVTH273DWRG4 operates from 2.7 V to 3.6 V on V_CC, supporting unregulated battery inputs and noisy industrial rails. Its inputs tolerate up to 5.5 V, allowing direct connection to 5-V TTL sources without level-shifting circuitry. This dual-voltage capability is intrinsic to the LVTH process and confirmed in the recommended operating conditions table of the SCBS136M datasheet.

Does SN74LVTH273DWRG4 require external pull-up or pull-down resistors on its data inputs?

No, SN74LVTH273DWRG4 does not require external pull-up or pull-down resistors because it integrates bus-hold circuitry on all eight D inputs. This feature actively maintains the last-valid logic state when inputs are floating or undriven, as specified in the functional description and electrical characteristics (II(hold) = ±750 µA). Using external resistors with bus-hold is explicitly discouraged in the datasheet.

What is the maximum clock frequency supported by SN74LVTH273DWRG4?

SN74LVTH273DWRG4 supports a maximum clock frequency of 150 MHz under recommended operating conditions (V_CC = 3.3 V ± 0.3 V, T_A = −40°C to 85°C). This value is guaranteed in the timing requirements table and verified across process/voltage/temperature corners. At 2.7 V, the max frequency remains 150 MHz, confirming robust high-speed operation across the full supply range.

How does the I_off feature protect SN74LVTH273DWRG4 during partial power-down?

The I_off circuitry in SN74LVTH273DWRG4 disables all outputs when V_CC = 0 V, limiting leakage current to ±100 µA even if input or output pins are driven externally. This prevents damaging reverse current flow through the device during hot-swap or staged power sequencing-critical for backplane and modular system designs. The specification is validated per JEDEC JESD78.

Is SN74LVTH273DWRG4 pin-compatible with other packages in the same family?

Yes, SN74LVTH273DWRG4 shares identical pinout and functionality with other 20-pin variants including SN74LVTH273DW (SOIC), SN74LVTH273NSR (SOP), and SN74LVTH273PWR (TSSOP). All use the same top-side marking convention (LXH273 for DB/PW, LVTH273 for DW/NS) and match the pin assignments shown in the logic diagram and package drawings. Mechanical dimensions differ, but electrical and logical behavior is identical.

SN74LVTH273DWRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

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

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Function:: Master Reset

Type:: D-Type

Output Type:: Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 150 MHz

Max Propagation Delay @ V, Max CL:: 4.9ns @ 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-SOIC

SN74LVTH273DWRG4 FAQ

1.How can I place an order for SN74LVTH273DWRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH273DWRG4 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 SN74LVTH273DWRG4 reliable?

The price and inventory of SN74LVTH273DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH273DWRG4 is usually 5 days.

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SN74LVTH273DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH273DWRG4 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 SN74LVTH273DWRG4?

For technical support, including SN74LVTH273DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH273DWRG4 requirements.

6.How does Aetrix verify that SN74LVTH273DWRG4 is sourced from the original manufacturer or authorized distributors?

All SN74LVTH273DWRG4 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 SN74LVTH273DWRG4 meets industry standards.

7.What is the process for return or replacement of SN74LVTH273DWRG4?

All SN74LVTH273DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH273DWRG4, 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 SN74LVTH273DWRG4 part is unused and in its original packaging.

Return procedure for SN74LVTH273DWRG4:

1.Submit a request within 90 days.

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

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