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Texas Instruments SN74LVT574DBR
- Part No.:
- SN74LVT574DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVT574DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,938
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Product details
Overview
SN74LVT574DBR from Texas Instruments is a 3.3-V ABT octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus-interface applications in mixed-voltage systems. It features 8 independent D-flip-flops triggered on the positive clock edge, 3-state output enable (OE), bus-hold inputs, and operation down to 2.7 V - enabling use in 3.3-V logic domains interfacing with 5-V peripherals in industrial control backplanes.
For engineers reviewing the SN74LVT574DBR datasheet, SN74LVT574DBR pinout, SN74LVT574DBR application, or SN74LVT574DBR equivalent, key selection criteria include its 150-MHz max clock frequency, ±64-mA output drive at 3.3 V, bus-hold input retention, low ground bounce (<0.8 V), and compatibility with live insertion in hot-swap systems.
Technical Context
This device implements eight synchronous D-type latches with edge-triggered clocking and independent 3-state output control via OE. Its Advanced BiCMOS Technology (ABT) enables TTL-level input compatibility (5-V tolerant) while operating from a 3.3-V supply, supporting mixed-mode signal environments without level shifters.
The internal bus-hold circuitry actively maintains valid logic states on unused D inputs, eliminating external pullup resistors. OE is asynchronous and does not affect internal latch operation - allowing data capture and storage to continue while outputs are tri-stated, critical for shared-bus arbitration and glitch-free state retention during bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and brownout resilience in portable or field-deployed equipment. |
| Max Clock Frequency | 150 MHz - enables high-speed data latching in memory address/data buffers and high-throughput serial-to-parallel interfaces. |
| IOL / IOH | 64 mA / −32 mA at VCC = 3 V - drives heavy capacitive loads (e.g., >50-pF buses) without external buffers in backplane or motherboard designs. |
| tsu / th | 2.4 ns setup / 0.3 ns hold - tight timing margins simplify PCB routing and reduce need for delay tuning in synchronous bus architectures. |
| VOLP (Ground Bounce) | <0.8 V at VCC = 3.3 V - minimizes noise coupling into adjacent signals during simultaneous output switching, improving signal integrity. |
| Bus-Hold Current | ±75 μA at VI = 2 V or 0.8 V - actively clamps floating inputs to valid logic levels, preventing metastability in unterminated stubs or partial-population modules. |
| Input Voltage Tolerance | VI up to 5.5 V - allows direct connection to legacy 5-V CMOS/TTL outputs without external voltage translation. |
Pinout & Package
SN74LVT574DBR is housed in a 20-pin Shrink Small-Outline (DB) package (JEDEC MO-153, 7.5 mm × 4.4 mm), offering 50% board area reduction versus standard SOIC while maintaining identical I/O count and thermal profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low asynchronous control: asserts high-impedance state on all Q outputs when high; no effect on internal latch operation. |
| 2–9 | D1–D8 (Data Inputs) | Asynchronous data inputs with integrated bus-hold - retain last valid logic state when floating, eliminating external pullups. |
| 10 | GND | Power ground reference for all internal logic and output drivers. |
| 11 | VCC | 3.3-V supply input; supports operation down to 2.7 V with full timing compliance. |
| 12–19 | Q1–Q8 (Outputs) | 3-state CMOS outputs; sink 64 mA / source 32 mA; high-impedance state isolates bus lines during contention. |
| 20 | CLK | Positive-edge-triggered clock input; synchronizes all eight D-to-Q transfers simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface support | 5-V-tolerant inputs with 3.3-V VCC enable direct connection to legacy 5-V logic without level shifters or resistive dividers. |
| Live insertion capability | Robust ESD protection (>2 kV HBM, >200 V MM) and controlled output turn-on/off allow safe hot-plug operation in modular backplanes. |
| Bus-hold inputs | Eliminates need for 10-kΩ external pullup/pulldown resistors on D inputs, reducing BOM count and PCB real estate in sparse-population slots. |
| Low ground bounce | VOLP < 0.8 V ensures minimal noise injection into shared ground planes during multi-bit output transitions, preserving adjacent analog or RF signal integrity. |
| Wide temperature range | Specified from −40°C to +85°C - qualified for industrial automation, telecom line cards, and transportation electronics with extended thermal cycling requirements. |
Applications
| Industrial PLC Backplane Interface | Memory Address Latch |
|---|---|
Use Scenario: Interfacing a 3.3-V microcontroller to a 5-V parallel bus in programmable logic controller rack modules. IC Role / Device Role / Timing Role: Octal D-flip-flop capturing address/data bits on CLK rising edge; OE controls bus release during DMA cycles. Use Value: Eliminates level translators and pullup resistors while sustaining 150-MHz throughput and surviving repeated hot-insertion events. | Use Scenario: Latching 8-bit address segments in SRAM or Flash memory subsystems with shared data/address multiplexing. IC Role / Device Role / Timing Role: Synchronous address register holding stable address values during memory access windows; 3-state outputs isolate bus during read-modify-write sequences. Use Value: Tight 2.4-ns setup time and 64-mA drive ensure reliable address hold under high-capacitance bus loading and fast clock edges. |
| Hot-Swappable I/O Module | Legacy System Bus Bridge |
Use Scenario: Providing isolated, glitch-free data capture in field-replaceable I/O cards for factory automation controllers. IC Role / Device Role / Timing Role: Edge-triggered latch buffering sensor/actuator data; bus-hold retains last valid state during card removal/insertion. Use Value: Enables true hot-swap capability without system reset or software reinitialization due to built-in bus-hold and robust ESD tolerance. | Use Scenario: Bridging a modern 3.3-V FPGA to an aging 5-V ISA or VMEbus peripheral subsystem. IC Role / Device Role / Timing Role: Voltage-tolerant D-flip-flop translating control and status signals across voltage domains while maintaining synchronous timing alignment. Use Value: 5.5-V input rating and 3.3-V core logic reduce interface complexity versus discrete MOSFET translators, lowering design risk and validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH574DBR | Lower drive strength (IOL = 32 mA), higher VOL (0.55 V), no bus-hold - requires external pullups on unused inputs. | Better suited for low-power, low-noise applications where bus loading is minimal and layout space permits discrete termination. | Select when power budget is tighter and system-level bus-hold is implemented elsewhere; avoid if floating inputs are unavoidable. |
| 74ALVC574PW | Same 20-pin TSSOP (PW) package, but 1.65–3.6-V VCC range and lower max fclock (125 MHz); no bus-hold or 5-V tolerance. | Targeted at ultra-low-voltage portable systems; incompatible with 5-V signal sources without external translation. | Choose only for new 1.8-V/2.5-V designs with strict voltage scaling; not a drop-in replacement for SN74LVT574DBR in mixed-voltage contexts. |
Compared with SN74LVTH574DBR and 74ALVC574PW, SN74LVT574DBR uniquely combines 5-V input tolerance, integrated bus-hold, 150-MHz speed, and 64-mA drive - making it the sole option among the three for robust, translator-free interfacing between 3.3-V controllers and legacy 5-V parallel buses.
Availability
SN74LVT574DBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address latching, hot-swappable I/O modules, and legacy bus bridging requiring stable component supply and long-term obsolescence management.
Supply support for SN74LVT574DBR 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 over 50 years of innovation in high-reliability interface and timing products.
The SN74LVT574DBR belongs to TI's ABT (Advanced BiCMOS Technology) logic family, engineered specifically for 3.3-V bus-interface applications demanding mixed-voltage compatibility, high drive strength, and live-insertion robustness in industrial and telecom infrastructure.
FAQ
What is the maximum clock frequency supported by the SN74LVT574DBR?
The SN74LVT574DBR supports a maximum clock frequency of 150 MHz across its full operating temperature range (−40°C to +85°C) at VCC = 3.3 V ± 0.3 V. This specification is verified under CL = 50 pF load conditions and reflects guaranteed performance for synchronous data capture in high-speed bus applications. The SN74LVT574DBR maintains this speed even at the minimum VCC of 2.7 V, ensuring reliability in brownout scenarios common in battery-backed systems.
Does the SN74LVT574DBR require external pullup resistors on its data inputs?
No, the SN74LVT574DBR does not require external pullup resistors on its D inputs because it integrates active bus-hold circuitry. This feature maintains valid logic levels (±75 μA hold current) on unused or floating D inputs, preventing metastability and eliminating BOM components. The bus-hold function is inherent to the SN74LVT574DBR silicon design and operates independently of OE or clock state - a key differentiator from standard LV or LVC variants like SN74LVTH574DBR.
Can the SN74LVT574DBR safely interface with 5-V logic signals?
Yes, the SN74LVT574DBR supports 5-V-tolerant inputs: its data (D) and clock (CLK) pins accept input voltages up to 5.5 V while operating from a 3.3-V supply. This capability is explicitly specified in the absolute maximum ratings and recommended operating conditions tables of the official TI datasheet (SCBS139D). The SN74LVT574DBR achieves this without external components, making it ideal for bridging 3.3-V microcontrollers to legacy 5-V peripheral buses - a core design intent confirmed in the device description.
What is the purpose of the OE pin on the SN74LVT574DBR, and how should it be handled during power-up?
The OE (Output Enable) pin on the SN74LVT574DBR is an active-low control that places all eight Q outputs in high-impedance state when asserted high. To ensure outputs remain in high-Z during power-up or power-down - preventing bus contention - TI recommends tying OE to VCC through a pullup resistor. The minimum resistor value depends on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. This behavior is documented in the functional description section of the SN74LVT574DBR datasheet and applies regardless of clock or data state.
Is the SN74LVT574DBR suitable for hot-swap applications?
Yes, the SN74LVT574DBR is explicitly designed for live insertion: it features ESD protection exceeding 2000 V (HBM) and 200 V (machine model), plus controlled output turn-on/off characteristics that prevent bus glitches during card insertion. Its bus-hold inputs retain valid states during disconnection, and the 3-state outputs isolate the bus immediately upon power loss. These attributes are validated per JEDEC JESD17 latch-up testing and cited in the device's key features - confirming the SN74LVT574DBR's suitability for hot-swap I/O modules in industrial and telecom chassis.
SN74LVT574DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 6.6ns @ 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-SSOP
SN74LVT574DBR FAQ
1.How can I place an order for SN74LVT574DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT574DBR 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 SN74LVT574DBR reliable?
The price and inventory of SN74LVT574DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT574DBR is usually 5 days.
3.What payment methods are accepted for SN74LVT574DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT574DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVT574DBR?
SN74LVT574DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT574DBR 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 SN74LVT574DBR?
For technical support, including SN74LVT574DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT574DBR requirements.
6.How does Aetrix verify that SN74LVT574DBR is sourced from the original manufacturer or authorized distributors?
All SN74LVT574DBR 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 SN74LVT574DBR meets industry standards.
7.What is the process for return or replacement of SN74LVT574DBR?
All SN74LVT574DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT574DBR, 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 SN74LVT574DBR part is unused and in its original packaging.
Return procedure for SN74LVT574DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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