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Texas Instruments SN74LV574APWT
- Part No.:
- SN74LV574APWT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV574APWT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:728
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Product details
Overview
SN74LV574APWT from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for 2-V to 5.5-V VCC operation. It features a maximum propagation delay of 7.1 ns at 5 V, Ioff support for partial-power-down mode, and balanced CMOS 3-state outputs optimized for driving capacitive bus loads in I/O expansion and bidirectional data buffering applications.
For engineers reviewing the SN74LV574APWT datasheet, SN74LV574APWT pinout, SN74LV574APWT application, or SN74LV574APWT equivalent, this device serves as a voltage-flexible, low-noise register for industrial I/O interfaces, LED display column drivers, and telecom backplane data latching where controlled output enable timing and ground-bounce suppression are critical.
Technical Context
The SN74LV574APWT implements eight independent D-type flip-flops triggered on the positive clock edge, with a shared active-low output-enable (OE) controlling all eight 3-state outputs simultaneously. Its latch structure retains data during OE assertion, enabling non-disruptive bus arbitration and hot-swap-compatible I/O staging.
It supports mixed-mode voltage operation: inputs tolerate 5.5 V regardless of VCC, allowing interfacing with higher-voltage logic while operating at 2.5 V or 3.3 V. The Ioff circuitry disables outputs when VCC = 0 V, preventing backflow current during power sequencing - a key requirement in multi-rail embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 2.5 V, 3.3 V, and 5 V logic domains without level shifters. |
| tpd (max) | 7.1 ns at 5 V - ensures sub-10 ns register-to-bus latency for high-speed control path timing budgets. |
| Ioff | <5 µA at VCC = 0 V - guarantees safe partial-power-down operation in modular power architectures. |
| VOLP / VOHV | <0.8 V / >2.3 V at 3.3 V - minimizes ground bounce and VOH undershoot to maintain signal integrity on shared PCB traces. |
| Output Drive | ±8 mA at 3.3 V - provides sufficient current to drive 15–50 pF bus capacitance without external buffers. |
| ESD Rating | ±2000 V HBM - meets industrial-grade robustness requirements for board-level handling and field deployment. |
| Operating Temp | –40°C to +125°C - qualified for extended temperature operation in telecom infrastructure and motor control enclosures. |
Pinout & Package
TSSOP-20 (PW) package, 5.0 mm × 4.4 mm body size, 0.65 mm pitch, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (active low) | Global 3-state control: asserts high-impedance on all Q outputs without affecting internal latch state. |
| 2–9 | D1–D8 | Eight asynchronous data inputs synchronized to CLK↑; tolerant up to 5.5 V regardless of VCC. |
| 10 | GND | Signal reference plane; must be low-inductance connection to minimize switching noise coupling. |
| 11 | CLK | Positive-edge-triggered clock input; requires clean monotonic transition to avoid metastability. |
| 12–19 | Q8–Q1 | Eight 3-state outputs; order reversed (Q8 first) per TI pinout convention; each independently controllable via OE. |
| 20 | VCC | Power supply rail; requires local 0.1 µF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5.5-V-tolerant inputs allow direct connection to legacy 5-V logic while operating at 2.5 V or 3.3 V - eliminates level translators in mixed-supply systems. |
| Low-ground-bounce outputs | Typical VOLP < 0.8 V at 3.3 V ensures minimal simultaneous switching noise on shared ground planes in dense LED or server backplanes. |
| Ioff partial-power-down | Prevents reverse current flow when VCC is unpowered - essential for hot-plug I/O modules and power-gated subsystems. |
| Controlled edge rates | Slower output transitions (vs. standard LVCMOS) reduce EMI and overshoot on unterminated traces - simplifies layout for cost-sensitive industrial designs. |
| High-impedance retention | Outputs enter high-Z without disturbing internal latch state - enables seamless bus handoff between multiple SN74LV574APWT devices sharing one data path. |
Applications
| LED Display Column Driver | Industrial I/O Expander |
|---|---|
|
Use Scenario: Driving 8-bit column segments of multiplexed LED signage with precise timing and low crosstalk. IC Role / Device Role / Timing Role: Latches column data on CLK↑ and holds stable output until next update; OE enables blanking between frames. Use Value: 3-state outputs prevent ghosting during row scanning; VOLP/VOHV specs ensure clean transitions even with long PCB traces to LED arrays. |
Use Scenario: Adding parallel digital I/O to microcontrollers with limited GPIO, used in PLC baseboards and sensor concentrators. IC Role / Device Role / Timing Role: Buffers host MCU data to peripheral sensors/actuators; OE synchronizes with system bus grant signals. Use Value: Ioff allows safe power cycling of I/O banks without disrupting main controller; 2–5.5 V range matches diverse sensor supply rails. |
| Telecom Backplane Register | Network Switch Data Buffer |
|
Use Scenario: Capturing and holding configuration data across hot-swappable line cards in carrier-grade switches. IC Role / Device Role / Timing Role: Stores card identification and port mapping bits; CLK aligned to system management bus clock. Use Value: –40°C to +125°C rating ensures reliability in sealed chassis; 5.5-V-tolerant inputs interface directly with legacy 5-V management buses. |
Use Scenario: Isolating and latching packet header metadata between ASIC stages in Layer 2/Layer 3 forwarding engines. IC Role / Device Role / Timing Role: Acts as pipeline register between lookup engine and egress scheduler; OE enables stall insertion without data loss. Use Value: 7.1 ns tpd at 5 V supports >100 MHz throughput; balanced drive prevents skew across 8-bit metadata bus. |
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 |
|---|---|---|---|
| SN74LVC574APWR | Lower VCC min (1.65 V), faster tpd (5.2 ns @ 3.3 V), but no VOLP/VOHV characterization; lacks Ioff spec. | Better suited for battery-powered 1.8-V systems; not recommended where ground bounce control or partial-power-down is required. | Select SN74LVC574APWR only if operating below 2 V or requiring sub-6 ns latency; otherwise SN74LV574APWT offers superior noise immunity and power sequencing safety. |
| 74ALVC574PW | Higher drive (±24 mA), wider VCC (1.65–3.6 V), but no 5-V tolerance; no Ioff; higher ICC (30 µA typical). | Optimized for high-speed 3.3-V-only buses; unsuitable for mixed-voltage or hot-swap scenarios. | Choose 74ALVC574PW only for compact 3.3-V FPGA I/O expansion where maximum speed outweighs power sequencing robustness. |
Compared with SN74LVC574APWR and 74ALVC574PW, the SN74LV574APWT uniquely combines 5.5-V input tolerance, Ioff-enabled safe power-down, and characterized ground-bounce performance - making it the preferred choice for industrial and telecom systems demanding interoperability, reliability, and signal integrity across voltage domains.
Availability
SN74LV574APWT is available at Aetrix Electronics and suitable for LED display column drivers, industrial I/O expanders, and telecom backplane registers requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for SN74LV574APWT 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 for industrial, automotive, and communications markets.
The SN74LV574APWT belongs to TI's LV family of low-voltage, high-noise-immunity logic devices, engineered specifically for robust data latching and bus interfacing in harsh electrical environments with wide supply ranges and strict ESD/EMI requirements.
FAQ
What is the maximum clock frequency supported by the SN74LV574APWT?
The SN74LV574APWT supports up to 130 MHz maximum clock frequency at VCC = 5 V with 15-pF load, and 80 MHz at VCC = 3.3 V under same conditions. These values derive from measured fmax in the TI datasheet (SCLS412K, Section 6.11), and assume proper layout, decoupling, and termination. For reliable operation, design margins should account for worst-case temperature and voltage variation.
Does the SN74LV574APWT support 5-V logic inputs when powered at 3.3 V?
Yes, the SN74LV574APWT supports 5.5-V-tolerant inputs - meaning all D and CLK inputs accept voltages up to 5.5 V regardless of VCC setting. This allows direct interfacing with 5-V microcontrollers or legacy peripherals while the SN74LV574APWT operates at 3.3 V, eliminating external level-shifting components in mixed-voltage systems.
How does the Ioff feature function in the SN74LV574APWT?
The Ioff circuitry in the SN74LV574APWT automatically disables all outputs when VCC drops to 0 V, limiting leakage current to <5 µA per pin. This prevents damaging backflow current from live bus lines into a powered-down device - a critical capability for hot-plug I/O modules and multi-rail power architectures where subsystems power up/down asynchronously.
What is the purpose of the VOLP and VOHV specifications for the SN74LV574APWT?
VOLP (output ground bounce) and VOHV (output VOH undershoot) quantify dynamic noise on the GND and VCC rails during output switching. For the SN74LV574APWT, typical VOLP < 0.8 V and VOHV > 2.3 V at 3.3 V ensure minimal disturbance to adjacent signals on shared PCB planes - directly supporting clean operation in high-density LED displays and telecom backplanes.
Can unused input pins on the SN74LV574APWT be left floating?
No. All unused inputs on the SN74LV574APWT must be tied to a valid logic level - either VCC or GND - to prevent undefined states, increased power consumption, and potential oscillation. TI explicitly recommends this in Section 9.4.1 of the datasheet (SCLS412K). Floating inputs violate recommended operating conditions and may cause erratic behavior or excessive current draw in the SN74LV574APWT.
SN74LV574APWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 175 MHz
- Max Propagation Delay @ V, Max CL:
- 10.6ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Current - Quiescent (Iq):
- 20 µA
- Input Capacitance:
- 1.8 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LV574APWT FAQ
1.How can I place an order for SN74LV574APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV574APWT 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 SN74LV574APWT reliable?
The price and inventory of SN74LV574APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV574APWT is usually 5 days.
3.What payment methods are accepted for SN74LV574APWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV574APWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV574APWT?
SN74LV574APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV574APWT 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 SN74LV574APWT?
For technical support, including SN74LV574APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV574APWT requirements.
6.How does Aetrix verify that SN74LV574APWT is sourced from the original manufacturer or authorized distributors?
All SN74LV574APWT 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 SN74LV574APWT meets industry standards.
7.What is the process for return or replacement of SN74LV574APWT?
All SN74LV574APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV574APWT, 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 SN74LV574APWT part is unused and in its original packaging.
Return procedure for SN74LV574APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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