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Texas Instruments SN74ACT574DBR
- Part No.:
- SN74ACT574DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT574DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,360
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Product details
Overview
SN74ACT574DBR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in 5-V digital systems. It operates from 4.5 V to 5.5 V, features 9 ns max propagation delay at 5 V, TTL-compatible inputs, and supports bidirectional bus driving via active-low output enable (OE). It is used in I/O port expansion and buffer register applications.
For engineers reviewing the SN74ACT574DBR datasheet, SN74ACT574DBR pinout, SN74ACT574DBR application, or SN74ACT574DBR equivalent, this page delivers verified electrical specs, SSOP-20 package details, timing behavior under 5-V operation, functional mode clarity, and real-world implementation guidance for bus-oriented logic design.
Technical Context
The SN74ACT574DBR implements eight independent D-type flip-flops synchronized to the rising edge of CLK, capturing input data (D1–D8) and presenting it at Q1–Q8 outputs. Its 3-state outputs are controlled by a shared active-low OE signal, enabling high-impedance bus release without affecting internal state retention.
It uses ACT (Advanced CMOS TTL-compatible) logic, ensuring compatibility with legacy TTL voltage thresholds while delivering CMOS power efficiency. The device meets JEDEC JESD78 Class II latch-up immunity and supports industrial temperature range (–40°C to +85°C) with ±2000-V HBM ESD rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances and brown-out resilience. |
| Max tpd | 9 ns at 5 V - Enables reliable operation up to 85 MHz clock frequency in synchronous bus systems. |
| Input Compatibility | TTL-voltage compatible - Accepts 0.8 V/2.0 V logic thresholds, allowing direct interfacing with legacy 74LS/74F families. |
| Output Drive | ±24 mA per output - Sufficient to drive 50-pF loads or multiple TTL inputs without external buffers. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded control and instrumentation environments. |
| ESD Rating | ±2000 V HBM - Meets standard handling requirements for automated assembly and field deployment. |
Pinout & Package
SN74ACT574DBR is housed in a 20-pin SSOP (Shrink Small Outline Package), body size 7.2 mm × 5.30 mm, overall package size 7.2 mm × 7.8 mm, with 0.65-mm lead pitch and 2-mm max height. Pin 1 is marked by a corner chamfer or index area per JEDEC MO-150.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 1) | Active-low output enable | Controls all eight outputs simultaneously; when high, forces Q1–Q8 into high-impedance state for bus sharing. |
| D1–D8 (Pins 2–9) | Data inputs | Asynchronous inputs latched on rising CLK edge; tolerate up to 5.5 V regardless of VCC. |
| GND (Pin 10) | Ground reference | Primary return path for logic and output current; must be low-inductance connection for noise control. |
| CLK (Pin 11) | Clock input | Rising-edge sensitive; requires clean transition (≤20 ns/V slew rate) to avoid metastability. |
| Q8–Q1 (Pins 12–19) | Tri-state outputs | Reflect D-input values when OE is low; present high-Z state when OE is high - no bus contention. |
| VCC (Pin 20) | Positive supply | Power rail for internal logic and output drivers; requires local 0.1-μF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered latching | Rising-edge CLK synchronizes all eight D inputs to outputs, enabling deterministic timing in pipelined data paths. |
| 3-state bus interface | Single OE pin places all outputs in high-Z, permitting shared-bus architectures without external transceivers or pull-ups. |
| TTL-compatible inputs | Accepts standard TTL logic levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V) while powered from 5-V supply - eliminates level-shifting needs. |
| Low propagation delay | 9 ns max tpd at 5 V supports >85 MHz system clocks, suitable for high-speed control register and FIFO staging applications. |
| Industrial temperature range | Rated for –40°C to +85°C operation - validated for use in motor drives, PLC I/O modules, and industrial HMIs. |
Applications
| Microcontroller I/O Expansion | Industrial Bus Interface |
|---|---|
Use Scenario: Expanding GPIO count of an MCU to drive discrete sensors, LEDs, or relays in a programmable logic controller. IC Role / Device Role / Timing Role: Acts as an output latch and bus driver, holding stable output states between MCU write cycles while isolating the bus during read operations. Use Value: Eliminates need for discrete buffers or multiplexers; enables 8-bit parallel data transfer with precise edge-aligned updates and bus contention avoidance. | Use Scenario: Interfacing a microprocessor data bus to peripheral devices such as ADCs, DACs, or memory-mapped peripherals in factory automation equipment. IC Role / Device Role / Timing Role: Functions as a bidirectional bus transceiver latch, capturing address/data on rising CLK and releasing bus via OE during idle cycles. Use Value: Provides clean 5-V logic-level translation and drive strength matching, reducing signal integrity issues on long PCB traces or backplanes. |
| Test Equipment Data Capture | Legacy System Emulation |
Use Scenario: Capturing parallel test signals from a DUT (device under test) in automated test equipment for real-time analysis or storage. IC Role / Device Role / Timing Role: Serves as a synchronous sampling latch, freezing parallel input data on each rising CLK edge for downstream processing or buffering. Use Value: Delivers sub-10 ns setup/hold timing (tsu = 2.5 ns, th = 1 ns), enabling accurate capture of fast digital waveforms without metastability risk. | Use Scenario: Replacing obsolete 74LS574 or 74F574 in legacy industrial controllers where footprint and pinout compatibility are critical. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout, logic behavior, and 3-state control - retains existing PCB layout and firmware. Use Value: Maintains system reliability while upgrading to ACT family's lower power, higher noise immunity, and extended temperature support. |
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 |
|---|---|---|---|
| SN74ACT574DWR | Same logic function and timing, but in SOIC-20 (12.8 mm × 10.3 mm) package - larger footprint, higher thermal resistance (RθJA = 101.2°C/W). | Suitable for through-hole prototyping or legacy board rework where SSOP reflow is not available. | Select when board space allows larger package or when SOIC hand-soldering is preferred over SSOP reflow. |
| SN74ACT574PWR | Identical functionality in TSSOP-20 (6.5 mm × 4.4 mm body), but with tighter 0.65-mm pitch and lower drive capability (RθJA = 126.2°C/W). | Better suited for space-constrained portable or modular designs where density outweighs thermal margin. | Choose for compact layouts requiring minimal PCB area, provided thermal derating and reflow process control are ensured. |
Compared with SN74ACT574DWR and SN74ACT574PWR, the SN74ACT574DBR offers optimal balance of thermal performance (RθJA = 70°C/W), board area (7.2 mm × 5.3 mm body), and manufacturability - making it the preferred choice for high-volume industrial PCBs requiring robust 5-V bus interfacing.
Availability
SN74ACT574DBR is available at Aetrix Electronics and suitable for industrial control systems, test equipment interfaces, microcontroller I/O expansion, and legacy system upgrades requiring stable component supply and long-term lifecycle support.
Supply support for SN74ACT574DBR 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, automotive, and communications markets.
The SN74ACT574DBR belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, low-power 5-V digital interfacing with TTL compatibility - targeting bus-oriented applications in industrial automation and instrumentation.
FAQ
What is the maximum clock frequency supported by the SN74ACT574DBR?
The SN74ACT574DBR supports a maximum clock frequency of 85 MHz under recommended operating conditions (VCC = 5 V, TA = –40°C to +85°C), derived from its 9 ns maximum propagation delay and timing requirements including 3 ns minimum pulse width and 2.5 ns setup time. This enables reliable use in high-speed control register and data capture applications.
Does the SN74ACT574DBR require external pull-up resistors on the OE pin?
Yes - to ensure the outputs remain in high-impedance state during power-up or power-down, TI recommends tying OE to VCC via a pull-up resistor. The minimum value depends on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ for robust noise immunity and fast disable timing in the SN74ACT574DBR.
Can the SN74ACT574DBR operate with a 3.3-V supply?
No - the SN74ACT574DBR is specified only for 4.5 V to 5.5 V VCC operation. Its TTL-compatible inputs and ACT logic architecture are optimized for 5-V systems. For 3.3-V applications, consider TI's SN74LVC574A or SN74ALVC574, which are functionally equivalent but rated for 3.3-V operation.
What is the purpose of the GND pin (Pin 10) in the SN74ACT574DBR pinout?
The GND pin (Pin 10) serves as the primary ground reference for both internal logic circuitry and output drivers in the SN74ACT574DBR. It carries return current for all eight outputs and must be connected to a low-impedance ground plane to minimize switching noise, ensure signal integrity, and meet the device's specified timing and ESD performance.
How does the SN74ACT574DBR handle unused input pins?
Unused input pins on the SN74ACT574DBR - including D1–D8 and CLK - must never be left floating. TI mandates connecting them to a defined logic level (VCC or GND) per input voltage specifications to prevent undefined states, increased power consumption, or potential oscillation. OE should also be actively driven or pulled high to avoid unintended output enable.
SN74ACT574DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 110 MHz
- Max Propagation Delay @ V, Max CL:
- 11ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ACT574DBR FAQ
1.How can I place an order for SN74ACT574DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT574DBR 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 SN74ACT574DBR reliable?
The price and inventory of SN74ACT574DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT574DBR is usually 5 days.
3.What payment methods are accepted for SN74ACT574DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT574DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT574DBR?
SN74ACT574DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT574DBR 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 SN74ACT574DBR?
For technical support, including SN74ACT574DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT574DBR requirements.
6.How does Aetrix verify that SN74ACT574DBR is sourced from the original manufacturer or authorized distributors?
All SN74ACT574DBR 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 SN74ACT574DBR meets industry standards.
7.What is the process for return or replacement of SN74ACT574DBR?
All SN74ACT574DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT574DBR, 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 SN74ACT574DBR part is unused and in its original packaging.
Return procedure for SN74ACT574DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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