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Texas Instruments SN74F574DW
- Part No.:
- SN74F574DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74F574DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:538
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Product details
Overview
SN74F574DW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs in a 20-pin SOIC (DW) package, operating at 4.5–5.5 V, supporting up to 100 MHz clock frequency, and rated for 0°C to 70°C industrial temperature range. It serves as a bus-driving register in digital systems requiring parallel data latching and high-impedance bus isolation.
For engineers reviewing the SN74F574DW datasheet, SN74F574DW pinout, SN74F574DW application, or SN74F574DW equivalent, key selection criteria include its positive-edge clock triggering, independent output enable control, 24 mA low-level output drive, 3.3 V minimum VOH at 3 mA, and SOIC-20 thermal and layout compatibility with legacy F-series TTL designs.
Technical Context
The SN74F574DW implements eight identical D-type flip-flops, each triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its buffered inputs reduce loading on upstream logic and support reliable timing across full temperature and voltage ranges.
Internal operation decouples OE from flip-flop state retention: data can be latched or held while outputs remain in high-impedance mode, enabling non-intrusive bus arbitration and multi-master system design without external gating logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | F-series TTL - ensures compatibility with legacy 74F system timing and drive levels |
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5 V rail with ±10% tolerance for robust noise margin |
| Max Clock Frequency | 100 MHz - enables high-speed register transfer in data paths up to 10 ns cycle time |
| Output Drive | 24 mA sink / –3 mA source - sufficient to drive 50 Ω transmission lines or 10+ LS-TTL loads |
| Propagation Delay | 3.2–10 ns (CLK→Q), 1.2–12.5 ns (OE→Q) - defines worst-case setup/hold timing margins in synchronous bus interfaces |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments without derating |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - compatible with TTL and CMOS input logic families at 5 V |
Pinout & Package
SN74F574DW uses a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, 2.65 mm max height, with 1.27 mm pitch and RoHS-compliant NiPdAu lead finish. Pin 1 is marked by a beveled corner or notch on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low control: drives all Q outputs to high-impedance when low; no effect on internal latch state |
| 2–9 (1D–8D) | Data Inputs | Asynchronous parallel data inputs synchronized to rising CLK edge |
| 10 (GND) | Ground | Reference return path for logic and output current; must be low-impedance for noise immunity |
| 11–18 (1Q–8Q) | True Outputs | 3-state buffered outputs reflecting latched D values; capable of driving capacitive buses directly |
| 19 (CLK) | Clock Input | Positive-edge-triggered master clock; internally buffered to minimize skew across eight channels |
| 20 (VCC) | Power Supply | +5 V supply pin; requires local 0.1 µF ceramic bypass capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latching | Eight independent flip-flops share one clock and OE, enabling compact 8-bit register implementation without external fanout logic |
| 3-state bus-driving outputs | Outputs switch between active logic levels and high-Z mode, eliminating need for external bus transceivers or pull-up resistors |
| Full parallel access | All eight D inputs accept new data simultaneously, supporting burst-mode load operations in memory-mapped I/O or FIFO interfaces |
| Buffered control inputs | OE and CLK inputs include Schmitt-trigger-like buffering to reject noise and ensure clean edge detection across temperature and voltage extremes |
| Retained state during OE disable | Latched data persists regardless of OE state, allowing safe bus sharing while preserving register contents for next access cycle |
Applications
| Microprocessor System Bus Interface | I/O Port Expansion |
|---|---|
Use Scenario: Interfacing an 8-bit microprocessor data bus to peripheral devices with timing-critical address/data handshaking. IC Role / Device Role / Timing Role: Acts as a transparent data latch and bus driver, capturing processor write data on CLK rise and presenting it to peripherals while isolating the bus during read cycles via OE control. Use Value: Eliminates need for discrete buffers or transceivers; supports direct connection to 50 Ω traces or 10+ TTL loads with guaranteed timing margins per TI SDFS005A spec. | Use Scenario: Expanding GPIO capability on legacy 8-bit controllers lacking sufficient native I/O pins. IC Role / Device Role / Timing Role: Functions as an output port register, holding stable logic states for LEDs, relays, or sensors while allowing dynamic updates synchronized to system clock. Use Value: Provides noise-immune, high-drive outputs (24 mA sink) suitable for direct LED driving or relay coil control without external drivers. |
| Bidirectional Data Bus Isolation | Working Register in Control Logic |
Use Scenario: Enabling shared data bus access among multiple masters (e.g., CPU, DMA controller, co-processor) in embedded control systems. IC Role / Device Role / Timing Role: Serves as a bidirectional bus interface element: OE controls directionality while CLK captures incoming data or releases stored data onto the bus. Use Value: Enables conflict-free bus arbitration using only one control signal (OE); internal latch retains last written value during high-Z periods, preventing bus float. | Use Scenario: Storing intermediate computation results or status flags in hardwired control units or sequencers. IC Role / Device Role / Timing Role: Operates as a static working register, holding values across clock cycles until explicitly updated-no internal reset or clear function required. Use Value: Supports deterministic, cycle-accurate state retention in synchronous finite-state machines where data stability between CLK edges is critical. |
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 |
|---|---|---|---|
| SN74LS574N | Lower speed (30 MHz max), higher propagation delay (15–25 ns), TTL-compatible but not F-series - reduced drive (8 mA sink), higher power consumption | Suitable for lower-frequency legacy systems where timing slack exists; not recommended for >50 MHz bus interfaces | Choose if cost sensitivity outweighs speed requirements and board already uses LS-family components |
| SN74ACT574PW | CMOS-based (ACT), 5 V tolerant, 100 MHz capable, lower ICC (2 µA typical), wider VIH/VIL thresholds, but different output structure (no true 3-state with same timing) | Better noise immunity and lower power, but requires verification of OE timing interaction with downstream loads due to different output stage architecture | Prefer for new designs targeting lower power and improved noise margin; verify tPZL/tPHZ against system bus release timing |
Compared with SN74LS574N and SN74ACT574PW, the SN74F574DW delivers optimal balance of speed, drive strength, and proven timing behavior in established 5 V TTL systems - especially where legacy timing budgets and bus loading match F-series specifications.
Availability
SN74F574DW is available at Aetrix Electronics and suitable for microprocessor bus interfacing, I/O port expansion, bidirectional bus isolation, and working register applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74F574DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74F574DW belongs to TI's legacy 74F TTL logic family, engineered for high-speed, low-noise digital system interconnect in 1980s–1990s computing and control equipment - emphasizing timing precision, bus drive capability, and interoperability with standard 5 V logic rails.
FAQ
What is the maximum clock frequency supported by the SN74F574DW?
The SN74F574DW supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C to 70°C). This is confirmed in the "Timing Requirements" table of the official TI datasheet SDFS005A, where fclock MAX = 100 MHz applies across the full temperature and voltage range. The SN74F574DW achieves this using optimized F-series TTL circuitry with propagation delays as low as 3.2 ns (CLK to Q).
Does the SN74F574DW have a reset or clear function?
No, the SN74F574DW does not include asynchronous reset (CLR) or preset (PRE) inputs. It is a pure edge-triggered D-type flip-flop with only CLK, D, OE, VCC, and GND connections. Data is retained in each latch until overwritten by the next CLK↑ event; OE affects only output state, not internal storage. This behavior is explicitly defined in the FUNCTION TABLE and logic diagram of the SN74F574DW datasheet.
Can the SN74F574DW drive a 50 Ω transmission line directly?
Yes, the SN74F574DW can drive a 50 Ω transmission line directly. Its low-level output current rating is 24 mA (IOL), and high-level output voltage remains ≥2.4 V at –3 mA (VOH), satisfying termination requirements for short-to-medium length 50 Ω lines. TI's switching characteristics specify tPLH/tPHL test conditions with RL = 500 Ω and CL = 50 pF, but the device's drive strength and output impedance support direct 50 Ω matching with appropriate series termination - verified in application notes for F-series bus drivers.
What is the pin 1 marking method for the SN74F574DW SOIC package?
The SN74F574DW in SOIC (DW) package uses a beveled corner or molded notch at the top-left corner (adjacent to pin 1) for pin 1 identification. This matches TI's DW0020A package outline drawing and is visible on the top surface of the body. The part marking "F574" appears adjacent to pin 1, consistent with TI's packaging addendum for SN74F574DW and SN74F574DWR.A.
Is the SN74F574DW still in active production?
The SN74F574DW is marked "Obsolete" in TI's official packaging addendum, while SN74F574DWR and SN74F574DWR.A are active with SOIC (DW) packaging, 2000-piece tape-and-reel, and Level-1 MSL rating. Aetrix Electronics sources the SN74F574DW from authorized legacy channels with full traceability and provides continuity support - including cross-reference guidance to active equivalents like SN74F574DWR.A when redesign is feasible.
SN74F574DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- 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:
- 100 MHz
- Max Propagation Delay @ V, Max CL:
- 8.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 3mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74F574DW FAQ
1.How can I place an order for SN74F574DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F574DW 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 SN74F574DW reliable?
The price and inventory of SN74F574DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F574DW is usually 5 days.
3.What payment methods are accepted for SN74F574DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F574DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F574DW?
SN74F574DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F574DW 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 SN74F574DW?
For technical support, including SN74F574DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F574DW requirements.
6.How does Aetrix verify that SN74F574DW is sourced from the original manufacturer or authorized distributors?
All SN74F574DW 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 SN74F574DW meets industry standards.
7.What is the process for return or replacement of SN74F574DW?
All SN74F574DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74F574DW, 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 SN74F574DW part is unused and in its original packaging.
Return procedure for SN74F574DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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