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Texas Instruments SN74ALS576BDW
- Part No.:
- SN74ALS576BDW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS576BDW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:440
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Product details
Overview
SN74ALS576BDW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverting outputs, designed for direct bus driving in digital systems. It features buffered control inputs, bus-structured pinout, and operates over 0°C to 70°C with 5 V supply. Key parameters include 30 MHz max clock frequency, 12 mA low-level output current, and 15 ns data setup time before CLK↑.
For engineers reviewing the SN74ALS576BDW datasheet, SN74ALS576BDW pinout, SN74ALS576BDW application, or SN74ALS576BDW equivalent, this device serves as a high-drive, bus-isolated register for I/O port expansion, bidirectional data buffering, and working register implementation in TTL-compatible industrial logic systems.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high transition of CLK, each with separate 3-state output enable (OE) control. Internal operations continue regardless of OE state-data can be latched or retained while outputs are disabled.
The SN74ALS576BDW uses Advanced Low-Power Schottky (ALS) bipolar technology, delivering higher speed and lower power than standard LS logic. Its bus-structured pinout (inputs on one side, outputs on the other) minimizes PCB trace crosstalk in high-density bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS) TTL |
| Function | Octal D-type edge-triggered flip-flop with 3-state inverting outputs |
| Max Clock Frequency | 30 MHz - supports high-speed synchronous data capture in bus interfaces |
| Output Drive | IOL = 24 mA - drives heavy capacitive loads and multiple TTL inputs directly |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails |
| Operating Temperature | 0°C to 70°C - rated for commercial/industrial ambient environments |
| Propagation Delay (tPLH) | 3–14 ns - enables sub-33 ns cycle timing in synchronous register chains |
Pinout & Package
SN74ALS576BDW is housed in 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 gull-wing leads.
| 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 for eight D-type flip-flops; sampled on CLK↑ |
| 10 | GND | Ground reference for logic and output drivers |
| 11 | VCC | +5 V supply for ALS logic core and output buffers |
| 12–19 | 1Q–8Q | Inverting 3-state outputs; high-impedance when OE = HIGH |
| 20 | CLK | Clock input; triggers simultaneous data capture on rising edge |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Separates D inputs (pins 2–9) and Q outputs (pins 12–19) to simplify PCB routing and reduce signal coupling on shared buses |
| Buffered control inputs | OE and CLK inputs include Schmitt-trigger-like hysteresis and drive strength sufficient to fan out to multiple devices without external buffers |
| Independent OE control | Allows retention of latched data while outputs are tri-stated-enables non-disruptive bus arbitration and hot-swap register updates |
| ALS process optimization | Delivers 30 MHz operation at 24 mA drive with typical ICC = 18 mA (outputs low), balancing speed, drive, and power in legacy TTL systems |
| No internal clear function | Distinguishes SN74ALS576BDW from SN74ALS577A; eliminates unintended reset paths in deterministic register pipelines |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Adding parallel digital I/O capability to programmable logic controllers using ISA or VME backplanes. IC Role / Device Role / Timing Role: Acts as an octal input latch and output driver, synchronizing field-side signals to the controller's clock domain while isolating bus loading. Use Value: Enables direct connection of 8-bit sensor or actuator data without level-shifting or additional bus buffers, leveraging 24 mA drive to meet TTL fan-out requirements. |
Use Scenario: Bridging modern microcontroller peripherals to legacy 8-bit data buses (e.g., Z80, 8085) requiring strict timing and bus contention control. IC Role / Device Role / Timing Role: Serves as a bidirectional bus register-latching incoming data on CLK↑ and presenting outputs only when enabled by system bus control logic. Use Value: Provides precise 15 ns setup/4 ns hold timing margins and 3-state isolation to prevent bus conflicts during multi-master arbitration cycles. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Data Capture |
Use Scenario: Generating synchronized 8-bit stimulus waveforms in ATE systems where deterministic edge alignment and repeatable timing are critical. IC Role / Device Role / Timing Role: Functions as a clocked waveform register-loading pattern data on each CLK↑ and holding stable outputs until next trigger. Use Value: Guarantees ≤14 ns tPLH/tPHL variation across all eight channels, ensuring skew-controlled parallel output transitions for jitter-sensitive test vectors. |
Use Scenario: Capturing parallel status signals from DUTs (e.g., memory chips, ASICs) during functional testing under controlled clock edges. IC Role / Device Role / Timing Role: Operates as a synchronous sampling latch-freezing DUT output states precisely at CLK↑ for post-capture analysis. Use Value: Supports 30 MHz sampling rate with guaranteed 15 ns setup time, enabling accurate capture of fast transient responses without metastability risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS576BN | Same ALS logic, identical electrical specs, but in 20-pin PDIP (N) package instead of SOIC (DW) | Through-hole mounting; suitable for prototyping, legacy board repair, or wave-soldered industrial assemblies | Select when manual assembly, socketing, or thermal mass requirements favor DIP over surface-mount |
| SN74AS576N | AS-family variant: higher speed (125 MHz fmax), stronger drive (48 mA IOL), but higher ICC (135 mA) and tighter VIH/VIL thresholds | Demands stricter input voltage margins and power delivery; not drop-in compatible due to timing and drive differences | Choose only when 30+ MHz operation is mandatory and system can support AS-family power/noise characteristics |
Compared with SN74ALS576BN, the SN74ALS576BDW offers identical logic behavior in a space-saving SOIC package ideal for high-density layouts; versus SN74AS576N, it trades peak speed for lower power, broader noise margin, and proven compatibility in established ALS-based designs.
Availability
SN74ALS576BDW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and automated test fixture data capture requiring stable component supply across extended production lifecycles.
Supply support for SN74ALS576BDW 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 with over 60 years of analog and logic innovation, headquartered in Dallas, Texas.
The SN74ALS576BDW belongs to TI's legacy TTL logic portfolio, engineered specifically for robust, high-drive bus interfacing in industrial control, test equipment, and military-grade systems requiring reliability under sustained thermal and electrical stress.
FAQ
What is the primary function of the SN74ALS576BDW?
The SN74ALS576BDW is an octal D-type edge-triggered flip-flop with 3-state inverting outputs. It captures and holds eight bits of data on the rising edge of CLK and presents them at high-drive, bus-compatible outputs that can be individually disabled via OE. Its design targets direct bus driving in industrial and test systems where signal integrity and load driving capability are critical.
Does the SN74ALS576BDW have a synchronous clear (CLR) input?
No, the SN74ALS576BDW does not include a CLR input. That function is present only in the related SN74ALS577A variant. The SN74ALS576BDW relies solely on clocked data entry and OE-controlled output disable-making it suitable for applications requiring deterministic, non-resettable register behavior.
What package type is used for the SN74ALS576BDW?
The SN74ALS576BDW uses a 20-pin SOIC (DW) package per TI's official packaging documentation. It measures 7.5 mm × 12.8 mm with 1.27 mm lead pitch and 2.65 mm maximum height, optimized for surface-mount assembly in space-constrained industrial PCBs.
Can the SN74ALS576BDW operate at 3.3 V?
No, the SN74ALS576BDW is specified only for 4.5 V to 5.5 V supply operation. Its ALS TTL architecture requires ≥4.5 V to guarantee correct VIH/VIL thresholds, output voltage levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V), and timing performance. Operation below 4.5 V is outside recommended conditions and may result in functional failure.
How does the OE pin affect internal latch operation in the SN74ALS576BDW?
The OE pin in the SN74ALS576BDW has no effect on internal latch operation. When OE is HIGH (disabled), outputs go high-impedance, but the flip-flops continue to sample and retain data on each CLK↑. This allows seamless bus arbitration-new data can be loaded or old data preserved without disrupting downstream logic states.
SN74ALS576BDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 30 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
SN74ALS576BDW FAQ
1.How can I place an order for SN74ALS576BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS576BDW 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 SN74ALS576BDW reliable?
The price and inventory of SN74ALS576BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS576BDW is usually 5 days.
3.What payment methods are accepted for SN74ALS576BDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS576BDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS576BDW?
SN74ALS576BDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS576BDW 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 SN74ALS576BDW?
For technical support, including SN74ALS576BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS576BDW requirements.
6.How does Aetrix verify that SN74ALS576BDW is sourced from the original manufacturer or authorized distributors?
All SN74ALS576BDW 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 SN74ALS576BDW meets industry standards.
7.What is the process for return or replacement of SN74ALS576BDW?
All SN74ALS576BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS576BDW, 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 SN74ALS576BDW part is unused and in its original packaging.
Return procedure for SN74ALS576BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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