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Texas Instruments SN74ALS574BNS
- Part No.:
- SN74ALS574BNS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74ALS574BNS.pdf
- Description:
- IC D-TYPE POS TRG SNGL 20SO
- Quantity:
- Payment:
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Inventory:1,600
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Product details
Overview
SN74ALS574BNS 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 from 0°C to 70°C, supports 5 V supply (4.5–5.5 V), delivers ±24 mA output drive, and achieves up to 35 MHz clock frequency. It is used in I/O port buffering and bidirectional data bus interfaces.
For engineers reviewing the SN74ALS574BNS datasheet, SN74ALS574BNS pinout, SN74ALS574BNS application, or SN74ALS574BNS equivalent, key selection criteria include its bus-structured 20-pin SOIC (NS) package, edge-triggered synchronous data capture on CLK↑, independent 3-state control via OE, and compatibility with TTL-level logic families in legacy industrial and computing systems.
Technical Context
This device implements eight independent D-type latches triggered on the rising edge of CLK, with separate 3-state output enable (OE) that does not affect internal state retention. Its buffered control inputs reduce loading on upstream drivers and improve noise immunity.
The SN74ALS574BNS lacks synchronous clear (CLR) - unlike SN74ALS575A - and uses a dedicated bus-oriented pinout where data inputs (1D–8D) and outputs (1Q–8Q) are interleaved to minimize trace skew on PCBs. It belongs to the ALS (Advanced Low-Power Schottky) logic family, offering lower power than standard LS while maintaining compatible voltage thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky), TTL-compatible input/output levels |
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across standard 5 V rail tolerances |
| Max Clock Frequency | 35 MHz - supports high-speed data latching in legacy bus architectures |
| Output Drive | ±24 mA - sufficient to directly drive multiple TTL loads or terminated transmission lines |
| Propagation Delay | tPLH/tPHL ≤ 14 ns - enables tight timing margins in synchronous bus designs |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and computing applications |
| Package | 20-pin SOP (NS) - surface-mount, RoHS-compliant, 12.0 mm × 7.5 mm footprint |
Pinout & Package
SN74ALS574BNS is housed in a 20-pin small-outline package (SOP-20, package code NS), with 1.27 mm pitch, 7.5 mm body width, and 2.65 mm max height. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; disables all Q outputs without affecting internal latch state |
| 2–9 | 1D–8D | Data inputs; sampled on rising CLK edge and stored in respective D-flip-flops |
| 10 | GND | Ground reference for logic and power return path |
| 11 | VCC | +5 V supply pin; decoupling capacitor required near this pin |
| 12–19 | 1Q–8Q | Noninverting 3-state outputs; reflect stored D values when OE is low |
| 20 | CLK | Clock input; rising-edge sensitive; triggers simultaneous capture of all eight D inputs |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Noninverting Outputs | Enables direct connection to shared data buses without external bus transceivers |
| Bus-Structured Pinout | Minimizes PCB trace length mismatch between corresponding D and Q signals, reducing skew |
| Buffered Control Inputs | Reduces capacitive loading on CLK and OE lines, improving signal integrity and fanout |
| Edge-Triggered Operation | Ensures deterministic sampling at precise clock edges, critical for synchronous system timing |
| ALS Logic Family Performance | Combines 35 MHz speed with ~17 mA typical ICC (outputs enabled), optimizing speed-power tradeoff |
Applications
| Industrial PLC I/O Modules | Legacy Computer Bus Interfaces |
|---|---|
Use Scenario: Isolating and latching sensor/actuator data in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Octal register holding parallel input data synchronized to system clock before CPU read access. Use Value: Enables deterministic sampling of 8-bit peripheral data with minimal external logic and no hold-time violations. | Use Scenario: Buffering address/data lines between CPU and memory or peripheral controllers in ISA or VME-style buses. IC Role / Device Role / Timing Role: Bidirectional bus driver and latch, isolating master and slave timing domains during data transfer cycles. Use Value: Provides 24 mA drive strength and 3-state control to prevent bus contention, supporting multi-master arbitration. |
| Test Equipment Digital Pattern Generators | Avionics Data Acquisition Systems |
Use Scenario: Capturing and holding test vectors for automated circuit board functional testing. IC Role / Device Role / Timing Role: Parallel input register capturing stimulus patterns on rising CLK, then presenting stable outputs to DUT. Use Value: Guarantees setup/hold compliance (tsu = 15 ns, th = 0 ns) for reliable pattern capture at 35 MHz. | Use Scenario: Interfacing discrete avionics sensors (e.g., pressure, temperature) to centralized flight management units. IC Role / Device Role / Timing Role: Input buffer and level translator between ruggedized sensor outputs and 5 V TTL-based processing subsystems. Use Value: Tolerates VIH = 2.0 V and VIL = 0.8 V, ensuring noise-immune operation in electrically noisy aircraft environments. |
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) through-hole package | Suitable for prototyping, manual assembly, or legacy through-hole PCBs; lacks RoHS exemption status | Select SN74ALS574BN for breadboarding or repair of existing through-hole designs where SOP rework is impractical |
| SN74AS574N | AS-family variant: higher speed (100 MHz fmax), stronger drive (±48 mA), but higher ICC (~126 mA) | Better suited for high-performance bus backplanes requiring faster settling and tighter timing margins | Choose SN74AS574N only if system clock exceeds 35 MHz or load capacitance demands >24 mA sink/source |
Compared with SN74ALS574BN and SN74AS574N, the SN74ALS574BNS offers optimal balance of speed, power, and surface-mount compatibility for cost-sensitive commercial embedded systems - especially where legacy bus timing and RoHS compliance are both required.
Availability
SN74ALS574BNS is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy computer bus interfaces, and avionics data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS574BNS 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 SN74ALS574BNS belongs to TI's legacy TTL-compatible logic portfolio, engineered specifically for reliable bus interfacing and data latching in commercial-grade digital systems operating at 5 V.
FAQ
What is the maximum clock frequency supported by SN74ALS574BNS?
The SN74ALS574BNS supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5–5.5 V, CL = 50 pF). This value is verified per the SDAS165B datasheet and reflects guaranteed performance across the full 0°C to 70°C temperature range. Exceeding 35 MHz may result in setup/hold violations or metastability. The SN74ALS574BNS must be operated within this limit to ensure reliable edge-triggered data capture.
Does SN74ALS574BNS include a synchronous clear (CLR) function?
No, the SN74ALS574BNS does not include a synchronous clear (CLR) input. It is functionally distinct from the SN74ALS575A, which adds CLR for global reset. The SN74ALS574BNS relies solely on individual D-input control and OE for output management. If synchronous reset is required, designers must use external logic or select SN74ALS575A - noting its different 24-pin package and timing characteristics.
What package type is used for SN74ALS574BNS?
The SN74ALS574BNS uses a 20-pin small-outline package (SOP) with designation NS. It measures 12.0 mm × 7.5 mm, has 1.27 mm lead pitch, and complies with RoHS requirements. This surface-mount package replaces older PDIP variants for automated assembly and space-constrained layouts, while maintaining pin compatibility with other 20-pin SN74ALS574B variants.
Can SN74ALS574BNS drive standard TTL loads directly?
Yes, the SN74ALS574BNS can drive standard TTL loads directly. Its output drive capability of –24 mA (sink) and +24 mA (source) meets or exceeds the input current requirements of legacy TTL devices (e.g., 74LS series). With VOH ≥ 2.4 V and VOL ≤ 0.4 V under full load, it maintains valid logic levels across worst-case fanout scenarios without external buffers.
How does the OE pin behave during active latching in SN74ALS574BNS?
In the SN74ALS574BNS, the OE (output enable) pin is fully independent of internal latch operation. When OE is high (disabled), all Q outputs enter high-impedance state, but stored data remains intact and unaffected by subsequent CLK transitions or D-input changes. This allows seamless data retention and new data loading while outputs are tri-stated - essential for bus arbitration and hot-swap scenarios.
SN74ALS574BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS574BNS FAQ
1.How can I place an order for SN74ALS574BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS574BNS 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 SN74ALS574BNS reliable?
The price and inventory of SN74ALS574BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS574BNS is usually 5 days.
3.What payment methods are accepted for SN74ALS574BNS?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS574BNS?
SN74ALS574BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS574BNS 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 SN74ALS574BNS?
For technical support, including SN74ALS574BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS574BNS requirements.
6.How does Aetrix verify that SN74ALS574BNS is sourced from the original manufacturer or authorized distributors?
All SN74ALS574BNS 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 SN74ALS574BNS meets industry standards.
7.What is the process for return or replacement of SN74ALS574BNS?
All SN74ALS574BNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS574BNS, 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 SN74ALS574BNS part is unused and in its original packaging.
Return procedure for SN74ALS574BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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