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Texas Instruments SN74ACT574DW
- Part No.:
- SN74ACT574DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT574DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,970
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Product details
Overview
SN74ACT574DW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus-oriented digital systems. It operates at 4.5 V to 5.5 V, features 9 ns max propagation delay at 5 V, TTL-compatible inputs, and supports rising-edge clock triggering. It is used in I/O port buffering, bidirectional bus driving, and working register applications in industrial control and data acquisition systems.
For engineers reviewing the SN74ACT574DW datasheet, SN74ACT574DW pinout, SN74ACT574DW application, or SN74ACT574DW equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional mode behavior, real-world use cases, and validated alternative parts - all grounded in TI's SCAS537F production datasheet (Feb 2024 revision).
Technical Context
The SN74ACT574DW implements eight independent D-type flip-flops synchronized to the rising edge of CLK, with a shared active-low output-enable (OE) controlling all eight Q outputs simultaneously. Its 3-state outputs drive high-capacitance or low-impedance buses without external pull-ups or interface logic.
Internal operation remains unaffected by OE state: data can be latched on CLK↑ while outputs are in high-impedance, enabling non-disruptive register updates. Input voltage tolerance extends to 5.5 V, ensuring interoperability with mixed-voltage logic interfaces.
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 rails with ±5% tolerance. |
| Max tpd | 9 ns at 5 V - Enables reliable timing in high-speed digital systems up to 85 MHz clock frequency. |
| IOH/IOL | –24 mA / 24 mA - Sustains robust bus driving capability under load without signal degradation. |
| Input Compatibility | TTL-voltage compatible - Accepts standard TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V) directly. |
| Operating Temp | –40 °C to +85 °C - Qualified for industrial environments including factory automation and test equipment. |
| ESD Rating | ±2000 V HBM - Provides baseline ESD resilience during board assembly and handling. |
| Power Dissipation | 40 pF typical Cpd - Predictable dynamic power consumption for thermal budgeting in dense layouts. |
Pinout & Package
SN74ACT574DW uses a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body: 12.80 mm × 7.5 mm), with 1.27 mm lead pitch and 2.65 mm max height. It is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Controls all eight Q outputs; when high, forces high-impedance state - essential for bus arbitration. |
| 2–9 (D1–D8) | Data inputs | Asynchronous inputs latched on CLK↑ rising edge; tolerate up to 5.5 V regardless of VCC. |
| 10 (GND) | Ground reference | Common return path for logic and output current; must be low-inductance for noise immunity. |
| 11 (CLK) | Clock input | Rising-edge triggered; requires minimum 3 ns pulse width and ≤20 ns/V input transition rate. |
| 12–19 (Q8–Q1) | 3-state outputs | Drive bus lines actively (high/low) or disconnect (Z) - eliminates contention in shared-data paths. |
| 20 (VCC) | Positive supply | Primary power rail; requires local 0.1 µF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Enables direct connection to shared data buses without external tri-state logic or pull-up resistors. |
| Edge-Triggered Latching | Rising-edge CLK synchronizes all eight D inputs simultaneously - critical for coherent register updates. |
| TTL-Compatible Inputs | Accepts standard 5 V TTL logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) without level-shifting circuitry. |
| High Drive Strength | ±24 mA output current supports driving 50 pF loads at full speed - suitable for backplane and long-trace routing. |
| Wide Supply Range | 4.5 V to 5.5 V operation accommodates aging power supplies and ripple without functional loss. |
Applications
| Industrial PLC I/O Modules | Test Equipment Data Capture |
|---|---|
Use Scenario: Capturing parallel sensor data from multiple analog-to-digital converters before serial transmission. IC Role / Device Role / Timing Role: Acts as a synchronized input latch, holding sampled values stable during microcontroller read cycles. Use Value: Eliminates metastability risk via edge-triggered capture and provides bus-isolated storage until firmware processes the byte. |
Use Scenario: Buffering pattern generator outputs to drive DUT (device-under-test) pins with precise timing alignment. IC Role / Device Role / Timing Role: Functions as a programmable output register, updating all 8 bits simultaneously on CLK↑. Use Value: Ensures deterministic setup/hold margins (tsu = 2.5 ns, th = 1 ns) for high-repetition test vectors at 85 MHz. |
| Legacy Bus Interface Adapters | Embedded Controller Expansion Ports |
Use Scenario: Translating between ISA-style 8-bit data buses and modern microcontroller GPIO headers. IC Role / Device Role / Timing Role: Serves as a bidirectional bus transceiver using OE-controlled 3-state outputs. Use Value: Prevents bus contention during direction switching and sustains signal integrity across 15 cm PCB traces. |
Use Scenario: Expanding limited MCU GPIO count to drive LED arrays, relay banks, or display segments. IC Role / Device Role / Timing Role: Operates as an output-hold register, retaining state even when OE disables outputs. Use Value: Maintains peripheral actuation state during MCU sleep modes or interrupt latency windows. |
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 |
|---|---|---|---|
| SN74ACT574DWR | Same die, identical electrical specs, SOIC-20 tape-and-reel packaging (2000 pcs/reel); active production status vs. SN74ACT574DW's obsolete status. | Identical functional use; preferred for new designs requiring volume procurement and guaranteed supply continuity. | Select SN74ACT574DWR for production builds - it replaces SN74ACT574DW without layout or firmware changes. |
| SN74LVC574APW | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), 3.5 ns tpd, TSSOP-20 package; not 5 V tolerant on inputs. | Suitable for low-voltage embedded systems but incompatible with 5 V buses or TTL-level sources without level shifters. | Choose SN74LVC574APW only if migrating fully to 3.3 V logic; verify all upstream signals meet LVC input thresholds. |
Compared with SN74ACT574DW, SN74ACT574DWR offers identical performance with assured availability, while SN74LVC574APW trades 5 V compatibility and bus-drive headroom for lower voltage operation and reduced power - making it unsuitable as a drop-in replacement in mixed-signal industrial designs.
Availability
SN74ACT574DW is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automated test equipment, legacy bus adapters, and embedded controller expansion ports requiring stable component supply and long-term BOM continuity.
Supply support for SN74ACT574DW 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74ACT574DW belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed, low-noise 5 V digital interfacing in mission-critical industrial and instrumentation applications.
FAQ
What is the maximum clock frequency supported by the SN74ACT574DW?
The SN74ACT574DW supports a maximum clock frequency of 85 MHz under recommended operating conditions (VCC = 5 V ± 0.5 V, TA = –40 °C to +85 °C). This is derived from its 9 ns maximum propagation delay and verified timing parameters in TI's SCAS537F datasheet Section 4.6. The device maintains setup (2.5 ns) and hold (1 ns) timing margins at this rate, enabling reliable operation in high-speed digital control loops.
Does the SN74ACT574DW support 5 V tolerant inputs?
Yes, the SN74ACT574DW supports 5 V tolerant inputs: its VI rating extends to VCC + 0.5 V, and absolute maximum input voltage is 7 V. Per Section 4.1 of the datasheet, inputs accept voltages up to 5.5 V regardless of VCC level - allowing direct interfacing with standard TTL outputs and legacy 5 V logic families without level-shifting circuitry.
Can the SN74ACT574DW outputs drive a 50 pF capacitive load at full speed?
Yes, the SN74ACT574DW is characterized to drive a 50 pF load with 9 ns max tpd at 5 V, as confirmed in Section 4.7 Switching Characteristics. Its ±24 mA output drive strength ensures clean signal edges into typical PCB trace and connector capacitance, making it suitable for backplane and multi-drop bus applications where load capacitance exceeds 30 pF.
Is the SN74ACT574DW pin-compatible with other packages in the SN74ACT574 family?
Yes, the SN74ACT574DW (SOIC-20) shares identical pin configuration and function mapping with SN74ACT574DBR (SSOP-20), SN74ACT574N (PDIP-20), and SN74ACT574PWR (TSSOP-20), as shown in Figure 3-1 and Table 3-1 of the datasheet. All variants use the same 20-pin assignment for OE, D1–D8, GND, CLK, Q8–Q1, and VCC - enabling footprint interchangeability in layout design.
What is the recommended power supply decoupling for the SN74ACT574DW?
Texas Instruments recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 20) of the SN74ACT574DW, per Section 7.1 of the datasheet. This minimizes high-frequency supply noise and prevents logic glitches during output transitions. For systems with multiple logic devices, paralleling a 1 µF capacitor nearby further suppresses lower-frequency ripple.
SN74ACT574DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 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-SOIC
SN74ACT574DW FAQ
1.How can I place an order for SN74ACT574DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT574DW 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 SN74ACT574DW reliable?
The price and inventory of SN74ACT574DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT574DW is usually 5 days.
3.What payment methods are accepted for SN74ACT574DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT574DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT574DW?
SN74ACT574DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT574DW 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 SN74ACT574DW?
For technical support, including SN74ACT574DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT574DW requirements.
6.How does Aetrix verify that SN74ACT574DW is sourced from the original manufacturer or authorized distributors?
All SN74ACT574DW 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 SN74ACT574DW meets industry standards.
7.What is the process for return or replacement of SN74ACT574DW?
All SN74ACT574DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT574DW, 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 SN74ACT574DW part is unused and in its original packaging.
Return procedure for SN74ACT574DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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