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Texas Instruments SN74LVTH574PWE4
- Part No.:
- SN74LVTH574PWE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH574PWE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,166
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Product details
Overview
SN74LVTH574PWE4 from Texas Instruments is a 3.3-V ABT octal edge-triggered D-type flip-flop with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V VCC), supporting unregulated battery operation down to 2.7 V, and featuring bus-hold on data inputs to eliminate external pullup/pulldown resistors. It operates across −40°C to 85°C and delivers 150-MHz clock frequency with tsu = 2 ns and tPLH/tPHL ≤ 4.9 ns at VCC = 3.3 V.
For engineers reviewing the SN74LVTH574PWE4 datasheet, SN74LVTH574PWE4 pinout, SN74LVTH574PWE4 application, or SN74LVTH574PWE4 equivalent, this page provides verified technical context, real-world timing and drive specifications, TSSOP-20 package details, hot-insertion support via Ioff and power-up 3-state, and validated alternatives for bus interface design in industrial control and embedded systems.
Technical Context
This device implements eight independent positive-edge-triggered D-type flip-flops with synchronous data capture on CLK↑ and asynchronous 3-state control via OE. Its ABT (Advanced BiCMOS Technology) architecture enables TTL-level input compatibility (VIH = 2 V, VIL = 0.8 V) while operating from a 3.3-V supply, making it suitable for bridging 3.3-V logic domains to legacy 5-V buses.
The integrated bus-hold circuitry maintains valid logic levels on floating data inputs without external components, and Ioff protection prevents backflow current during power-down. Power-up 3-state ensures outputs remain high-impedance until VCC stabilizes, avoiding bus contention in hot-swap applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and tolerates supply droop in portable/embedded systems. |
| Max Clock Frequency | 150 MHz - enables high-speed data latching in memory interfaces and synchronous bus controllers. |
| tsu / th | 2 ns setup / 0.9 ns hold at VCC = 3.3 V - tight timing margins allow reliable interfacing with fast microcontrollers and FPGAs. |
| IOL / IOH | 64 mA low / −32 mA high output drive - sufficient to drive multiple TTL loads or terminated transmission lines. |
| Bus-Hold Current | ±75 μA at VCC = 3 V - actively holds unused D inputs at valid logic levels, eliminating need for external biasing. |
| Ioff | ±100 μA at VCC = 0 - disables outputs during power-down to prevent damaging back-current in hot-insertion systems. |
| VOHP / VOLP | <0.8 V output ground bounce at VCC = 3.3 V - reduces switching noise in dense PCB layouts with shared ground planes. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm pitch, exposed thermal pad (pin 21 not electrically connected), RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1D–8D | Data inputs | Eight asynchronous D inputs; each latched on CLK↑ rising edge; bus-hold enabled by default. |
| 1Q–8Q | Output terminals | Octal 3-state outputs; driven high/low when OE = L; high-impedance when OE = H. |
| CLK | Clock input | Positive-edge-triggered global clock; synchronizes all eight flip-flops simultaneously. |
| OE | Output enable | Active-low control; does not affect internal latch state - allows data retention during bus isolation. |
| VCC | Power supply | 3.3-V nominal supply; supports down to 2.7 V; must be decoupled locally per TI layout guidelines. |
| GND | Ground reference | Digital ground plane connection; separate from analog ground; ties to exposed thermal pad for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | Accepts 5-V TTL inputs and drives 5-V loads while powered from 3.3-V VCC, enabling seamless 3.3/5-V domain bridging. |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on all eight D inputs, reducing BOM count and PCB area in sparse-bus designs. |
| Hot-insertion support | Ioff and power-up 3-state prevent back-current and bus conflicts during live board insertion into backplanes or modular systems. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures minimal noise coupling into adjacent signals during simultaneous output switching. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - robust against transient overvoltage events in industrial environments with noisy power rails. |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O capability to a compact PLC base unit using a 3.3-V MCU with 5-V field-side sensors/actuators. IC Role / Device Role / Timing Role: Octal D-flip-flop latches MCU GPIO outputs onto a 5-V tolerant bus; OE isolates bus during reconfiguration. Use Value: Enables direct 3.3-V MCU control of legacy 5-V industrial peripherals without level-shifter ICs or discrete MOSFETs. |
Use Scenario: Interfacing an FPGA's general-purpose I/O bank to a legacy 8-bit parallel memory or peripheral bus. IC Role / Device Role / Timing Role: Synchronizes and buffers FPGA output data to meet setup/hold timing of slower memory devices; CLK aligns writes to system clock edge. Use Value: Provides deterministic 2-ns setup margin and 150-MHz throughput, eliminating timing closure issues in FPGA-to-legacy-bus bridges. |
| Hot-Swappable Backplane Module | Automotive Body Control Unit |
Use Scenario: Isolating a removable compute module's local bus from a shared backplane during insertion/removal. IC Role / Device Role / Timing Role: Acts as bidirectional bus buffer; Ioff and power-up 3-state prevent backfeed into powered-backplane traces. Use Value: Meets MIL-STD-1399 hot-swap requirements without auxiliary sequencing circuitry or complex power management ICs. |
Use Scenario: Latching diagnostic status bits from multiple vehicle subsystems (e.g., door locks, lighting) into a central BCM microcontroller. IC Role / Device Role / Timing Role: Captures asynchronous sensor alerts on CLK edge; bus-hold maintains valid state if wiring harness disconnects. Use Value: Ensures fault data integrity during intermittent connections and eliminates need for external pull resistors in harsh automotive harness environments. |
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 |
|---|---|---|---|
| SN74LVC574APW | Lower drive (24 mA IOL), no bus-hold, 1.65–3.6 V VCC, no Ioff support. | Suitable only for 3.3-V-only systems without hot-swap or floating-input concerns. | Select when cost sensitivity outweighs mixed-voltage and robustness requirements. |
| SN74AHCT574PW | 5-V-only VCC (4.5–5.5 V), higher propagation delay (tPLH up to 10.5 ns), no bus-hold or Ioff. | Restricted to legacy 5-V designs; incompatible with 3.3-V supply rails. | Choose only for retrofitting existing 5-V boards where VCC cannot be reduced. |
Compared with SN74LVC574APW and SN74AHCT574PW, the SN74LVTH574PWE4 uniquely combines 3.3-V operation with 5-V I/O tolerance, integrated bus-hold, and Ioff-enabled hot insertion - making it the sole option among these three for mixed-voltage, high-reliability industrial bus interfaces.
Availability
SN74LVTH574PWE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus interfacing, and hot-swappable backplane modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74LVTH574PWE4 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.
The SN74LVTH574PWE4 belongs to TI's ABT logic family, engineered specifically for robust 3.3-V bus interfacing in mixed-voltage systems - emphasizing hot-swap resilience, noise immunity, and seamless 5-V legacy integration.
FAQ
What is the maximum clock frequency supported by the SN74LVTH574PWE4?
The SN74LVTH574PWE4 supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3 V ± 0.3 V, TA = −40°C to 85°C). This rating is confirmed in the timing requirements table of the official datasheet (SCBS688G, p.6), where fclock MIN = 150 MHz is specified for both SN74LVTH574 variants at VCC = 3.3 V.
Does the SN74LVTH574PWE4 support hot-plug operation?
Yes, the SN74LVTH574PWE4 supports hot-plug operation through two key features: Ioff circuitry disables outputs when VCC = 0 V to prevent back-current, and power-up 3-state holds outputs in high-impedance until VCC stabilizes. These capabilities are explicitly documented in the datasheet (p.1) and qualify the SN74LVTH574PWE4 for use in live-insertion backplane and modular system applications.
What is the purpose of the bus-hold feature on the SN74LVTH574PWE4 data inputs?
The bus-hold feature on the SN74LVTH574PWE4 actively maintains valid logic levels (high or low) on unused or floating D inputs without external resistors. With ±75 μA hold current at VCC = 3 V (p.5), it eliminates risk of metastability or EMI-induced glitches - critical in systems with unterminated stubs or intermittent connections, such as automotive body control units or industrial I/O modules.
Can the SN74LVTH574PWE4 interface directly with 5-V logic devices?
Yes, the SN74LVTH574PWE4 supports direct 5-V interface: its inputs tolerate up to 5.5 V (VI absolute max = 7 V), and outputs drive to ≥2 V high and ≤0.55 V low into 64-mA loads at VCC = 3 V (p.5), meeting TTL voltage thresholds. This mixed-mode capability is a core design objective stated in the datasheet introduction (p.1) and enables seamless integration with legacy 5-V peripherals without level shifters.
What package type is used for the SN74LVTH574PWE4?
The SN74LVTH574PWE4 uses the TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm lead pitch, with an exposed thermal pad (pin 21). This is confirmed in the ordering information table (p.1), package outline drawing (PW0020A), and TI's packaging addendum - where SN74LVTH574PW and SN74LVTH574PWR are explicitly assigned to the PW package variant.
SN74LVTH574PWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 4.5ns @ 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:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVTH574PWE4 FAQ
1.How can I place an order for SN74LVTH574PWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH574PWE4 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 SN74LVTH574PWE4 reliable?
The price and inventory of SN74LVTH574PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH574PWE4 is usually 5 days.
3.What payment methods are accepted for SN74LVTH574PWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH574PWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH574PWE4?
SN74LVTH574PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH574PWE4 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 SN74LVTH574PWE4?
For technical support, including SN74LVTH574PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH574PWE4 requirements.
6.How does Aetrix verify that SN74LVTH574PWE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH574PWE4 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 SN74LVTH574PWE4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH574PWE4?
All SN74LVTH574PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH574PWE4, 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 SN74LVTH574PWE4 part is unused and in its original packaging.
Return procedure for SN74LVTH574PWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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