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Texas Instruments SN74ALS574BDW
- Part No.:
- SN74ALS574BDW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS574BDW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,537
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Product details
Overview
SN74ALS574BDW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, designed for bus driving in digital systems. It operates at 0°C to 70°C, supports 35 MHz clock frequency, delivers ±24 mA output drive, and features bus-structured pinout with buffered OE and CLK inputs.
For engineers reviewing the SN74ALS574BDW datasheet, SN74ALS574BDW pinout, SN74ALS574BDW application, or SN74ALS574BDW equivalent, this device is selected for synchronous data latching in 8-bit parallel interfaces where high-impedance bus isolation and TTL-compatible timing are required.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock transition, with separate 3-state output enable (OE) control that does not affect internal state retention. Its logic architecture supports concurrent data capture and bus release without race conditions.
The SN74ALS574BDW uses Advanced Low-Power Schottky (ALS) bipolar technology, delivering faster propagation delays (tPLH/tPHL ≤ 14 ns at VCC = 5 V) and lower ICC (≤ 28 mA) than standard LS logic, while maintaining TTL input thresholds and output voltage levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS), TTL-compatible interface |
| Function | Octal D-type edge-triggered flip-flop with 3-state noninverting outputs |
| Max Clock Frequency | 35 MHz - enables reliable operation in 28.6 ns minimum clock period systems |
| Output Drive | IOL = 24 mA / IOH = –2.6 mA - sufficient to drive multiple TTL loads or terminated transmission lines |
| Propagation Delay | tPLH/tPHL ≤ 14 ns - ensures tight timing margins in high-speed bus latch applications |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control environments |
| Supply Voltage | VCC = 4.5 V to 5.5 V - compatible with standard 5 V regulated power rails |
Pinout & Package
SN74ALS574BDW is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, 2.65 mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (1D–8D) | Asynchronous parallel data inputs synchronized to rising CLK edge |
| 9 | GND | Power ground reference for all logic and output stages |
| 10 | VCC | +5 V supply for internal logic and output drivers |
| 11, 12, 13, 14, 15, 16, 17, 18 | Outputs (1Q–8Q) | Noninverting 3-state latched outputs; high-impedance when OE = H |
| 19 | CLK | Edge-triggered clock input; data latched on low-to-high transition |
| 20 | OE | Active-low 3-state output enable; no effect on internal flip-flop state |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes PCB trace crossovers in 8-bit data bus layouts |
| Buffered control inputs | Reduces capacitive loading on CLK and OE lines, improving signal integrity |
| 3-state noninverting outputs | Enables bidirectional bus sharing without external direction control logic |
| Retained data during high-Z | Allows new data loading or state retention while outputs are disabled |
| TTL-compatible thresholds | VIH = 2.0 V, VIL = 0.8 V - interoperable with legacy 5 V logic families |
Applications
| Microprocessor Data Bus Interface | Industrial I/O Port Expansion |
|---|---|
Use Scenario: Latching address/data multiplexed bus signals in 8080/Z80-based systems. IC Role / Device Role / Timing Role: Acts as transparent data register synchronizing peripheral access timing to CPU clock edges. Use Value: Eliminates need for discrete gating logic by providing simultaneous 8-bit capture and bus isolation. | Use Scenario: Expanding GPIO count on PLC backplane modules with shared data highways. IC Role / Device Role / Timing Role: Provides isolated, noise-immune input sampling and output staging for field I/O cards. Use Value: Enables hot-swap-safe bus connection via 3-state control, preventing contention during module insertion. |
| Test Equipment Pattern Generator | Legacy Communication Controller |
Use Scenario: Holding stable test vectors during automated functional testing of digital ASICs. IC Role / Device Role / Timing Role: Serves as static pattern buffer between sequencer and DUT interface pins. Use Value: Delivers precise setup/hold timing (tsu = 15 ns, th = 4 ns) for repeatable stimulus delivery. | Use Scenario: Managing parallel control/status registers in RS-232/RS-422 protocol adapters. IC Role / Device Role / Timing Role: Buffers command bytes and latches status flags under UART handshaking control. Use Value: Supports deterministic read-modify-write cycles using OE-gated bus arbitration. |
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 |
|---|---|---|---|
| SN74ALS574BN | Same ALS logic, identical electrical specs, but in 20-pin PDIP (N) package | Through-hole mounting; no reflow compatibility; larger footprint | Select for prototyping, legacy repair, or wave-soldered assemblies |
| SN74AS574DWR | Faster AC specs (fmax = 100 MHz), higher drive (IOL = 48 mA), AS family silicon | Higher power consumption (ICC up to 134 mA); requires tighter layout for signal integrity | Select when >35 MHz operation or enhanced noise margin is required |
Compared with SN74ALS574BN and SN74AS574DWR, the SN74ALS574BDW offers optimal balance of surface-mount compatibility, commercial temperature range, and proven ALS reliability-making it preferred for volume-manufactured 5 V digital systems where cost, size, and thermal stability are prioritized over extreme speed.
Availability
SN74ALS574BDW is available at Aetrix Electronics and suitable for microprocessor bus interfaces, industrial I/O expansion, test equipment pattern generation, and legacy communication controllers requiring stable component supply across production lifecycles.
Supply support for SN74ALS574BDW 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 for industrial, automotive, and communications markets.
The SN74ALS574BDW belongs to TI's legacy 74ALS logic family, engineered for high-speed, low-power 5 V digital system interfacing with robust noise immunity and bus-driving capability.
FAQ
What is the maximum clock frequency supported by SN74ALS574BDW?
The SN74ALS574BDW supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This is verified by tPLH/tPHL ≤ 14 ns and minimum pulse width requirements (tw ≥ 14 ns for CLK high/low), ensuring reliable edge-triggered data capture in synchronous digital designs using the SN74ALS574BDW.
Does SN74ALS574BDW include a synchronous clear function?
No, the SN74ALS574BDW does not include a synchronous clear (CLR) input. That feature is present only in the SN74ALS575A, SN74AS575, and SN54AS575 variants. The SN74ALS574BDW has only CLK and OE control inputs; its eight flip-flops retain state until overwritten by new data on the next clock edge, making the SN74ALS574BDW suitable for pure latch-and-hold applications without reset dependency.
What package type is used for SN74ALS574BDW?
The SN74ALS574BDW uses a 20-pin SOIC (DW) package - 7.5 mm body width, 12.8 mm length, 2.65 mm maximum height - with NiPdAu lead finish, RoHS compliance, and MSL Level-1 moisture sensitivity rating. This surface-mount package supports automated assembly and is dimensionally distinct from the PDIP (N), CFP (W), or LCCC (FK) variants listed for other members of the 74ALS574 family.
Can SN74ALS574BDW outputs drive multiple TTL loads directly?
Yes, SN74ALS574BDW outputs can drive multiple TTL loads directly: each output provides IOL = 24 mA (low-level) and IOH = –2.6 mA (high-level) at VCC = 4.5 V, meeting the fanout requirement for standard TTL (one SN74ALS574BDW output can drive ≥10 74LS inputs). Its 3-state capability further allows safe bus sharing without external buffers, confirming direct bus-line driving capability for the SN74ALS574BDW.
Is SN74ALS574BDW still in active production?
The SN74ALS574BDW is marked "Obsolete" in TI's official packaging documentation, though its tape-and-reel variant SN74ALS574BDWR remains Active with 2000-unit reels, NiPdAu finish, and MSL Level-1 rating. Aetrix Electronics maintains inventory and supply-chain continuity for the SN74ALS574BDW to support legacy system maintenance and long-lifecycle industrial deployments requiring the exact DW-package variant.
SN74ALS574BDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 35 MHz
- Max Propagation Delay @ V, Max CL:
- 14ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 18 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS574BDW FAQ
1.How can I place an order for SN74ALS574BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS574BDW 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 SN74ALS574BDW reliable?
The price and inventory of SN74ALS574BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS574BDW is usually 5 days.
3.What payment methods are accepted for SN74ALS574BDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS574BDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS574BDW?
SN74ALS574BDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS574BDW 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 SN74ALS574BDW?
For technical support, including SN74ALS574BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS574BDW requirements.
6.How does Aetrix verify that SN74ALS574BDW is sourced from the original manufacturer or authorized distributors?
All SN74ALS574BDW 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 SN74ALS574BDW meets industry standards.
7.What is the process for return or replacement of SN74ALS574BDW?
All SN74ALS574BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS574BDW, 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 SN74ALS574BDW part is unused and in its original packaging.
Return procedure for SN74ALS574BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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