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Texas Instruments SN74ALS576BNSR
- Part No.:
- SN74ALS576BNSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS576BNSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,501
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Product details
Overview
SN74ALS576BNSR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverting outputs, designed for bus driving in digital systems. It features clock-triggered data capture on CLK rising edge, independent output-enable control (OE), and operates over 0°C to 70°C with 4.5–5.5 V supply. It is used in I/O port buffering, bidirectional bus interfaces, and working register implementations.
For engineers reviewing the SN74ALS576BNSR datasheet, SN74ALS576BNSR pinout, SN74ALS576BNSR application, or SN74ALS576BNSR equivalent, key selection considerations include its 20-pin SOP (NS) package, 30 MHz max clock frequency, 12 mA low-level output drive, bus-structured pinout, and compatibility with ALS logic families in industrial bus-hold and register applications.
Technical Context
This device implements eight independent D-type flip-flops, each with asynchronous 3-state output control via OE. Data is latched on the low-to-high transition of CLK, while OE does not affect internal state retention-allowing new data entry or hold during output disable.
The SN74ALS576BNSR uses bipolar ALS (Advanced Low-Power Schottky) technology, delivering higher speed and lower power than standard LS logic. Its buffered control inputs reduce loading on upstream drivers, and its bus-structured pinout minimizes PCB trace crossovers in high-density bus designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures compatibility with 74LS/74ALS systems and enables mixed-logic interfacing with defined VIH/VIL thresholds. |
| Max Clock Frequency | 30 MHz - supports high-speed synchronous data latching in bus arbitration and register file applications. |
| Output Drive | IOL = 12 mA (min), IOH = −2.6 mA (min) - sufficient to directly drive standard TTL/ALS bus loads without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 14 ns (max) at VCC = 4.5–5.5 V, CL = 50 pF - enables tight timing margins in 30 MHz bus cycles. |
| 3-State Enable/Disable | tPZH/tPLZ ≤ 18 ns (max); tPHZ/tPLZ ≤ 10 ns (max) - ensures fast, glitch-free bus release and acquisition during multiplexed access. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control, instrumentation, and industrial logic subsystems. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with regulated +5 V rails and tolerant of typical power supply ripple in legacy digital systems. |
Pinout & Package
SN74ALS576BNSR is housed in a 20-pin SOP (Small Outline Package) with NS suffix, measuring 13.0 mm × 7.6 mm × 2.65 mm (max height), RoHS-compliant NIPDAU lead finish, and MSL Level-1 rating for unlimited reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; disables all eight Q outputs to high-impedance without affecting internal flip-flop state. |
| 2–9 | 1D–8D | Data inputs for each of eight D-type flip-flops; synchronized to CLK rising edge. |
| 10 | GND | Ground reference for logic and output stages; must be low-impedance for stable 3-state transitions. |
| 11 | VCC | +5 V supply pin; decoupling capacitor required near this pin to suppress switching noise. |
| 12–19 | 1Q–8Q | Inverting 3-state outputs; each mirrors corresponding D input after CLK↑, unless OE is asserted. |
| 20 | CLK | Clock input; edge-triggered on low-to-high transition; requires clean, monotonic rise time per ALS timing specs. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes PCB routing complexity by grouping D inputs (pins 2–9) and Q outputs (pins 12–19) adjacently, enabling direct parallel bus connection with minimal layer crossover. |
| Independent OE control | Allows dynamic bus sharing: internal registers retain valid data while outputs are tri-stated, supporting read-modify-write sequences without latch corruption. |
| Buffered control inputs | Reduces capacitive loading on OE and CLK lines, improving fan-out capability and signal integrity when driven from high-impedance sources like microcontroller GPIO. |
| ALS logic compatibility | Guarantees interoperability with 74LS, 74ALS, and 74F families via standardized VIH (≥2.0 V), VIL (≤0.8 V), and output voltage specs (VOH ≥2.4 V, VOL ≤0.4 V). |
| 30 MHz operation | Enables use in high-throughput data acquisition systems where octal latching must keep pace with microprocessor bus cycles or DMA transfers. |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Bus Interface |
|---|---|
|
Use Scenario: Expanding discrete I/O capacity in programmable logic controllers using shared backplane buses. IC Role / Device Role / Timing Role: Acts as an octal input latch and output driver, synchronizing field sensor data to the CPU clock and driving actuator control lines. Use Value: Enables deterministic sampling of 8-bit status inputs and concurrent update of 8-bit command outputs with single-cycle timing control and bus contention avoidance. |
Use Scenario: Interfacing automated test equipment (ATE) pattern generators to device-under-test (DUT) parallel ports. IC Role / Device Role / Timing Role: Buffers and latches stimulus vectors from ATE controller before applying them to DUT pins under precise clock alignment. Use Value: Provides clean, skew-minimized 8-bit vector delivery with sub-15 ns setup/hold margins, critical for high-speed functional testing at 30 MHz. |
| Legacy Computer System Register File | Communications Protocol Converter |
|
Use Scenario: Implementing general-purpose working registers in retro-computing or embedded controller designs with 8-bit data paths. IC Role / Device Role / Timing Role: Functions as a writeable, clocked storage bank with tri-state outputs for bidirectional data bus access. Use Value: Delivers reliable 8-bit storage with simultaneous read/write isolation, eliminating need for external bus transceivers in compact board layouts. |
Use Scenario: Bridging parallel control signals between UART-based host processors and peripheral ICs requiring strobed 8-bit command interfaces. IC Role / Device Role / Timing Role: Captures and holds configuration bytes from serial-to-parallel conversion, then presents them synchronously to target peripherals. Use Value: Resolves timing mismatches between asynchronous serial receive and synchronous peripheral command clocks, ensuring glitch-free register programming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS577ADWR | Includes synchronous clear (CLR) input; 24-pin SOIC package; identical ALS speed and drive specs. | Required where global register reset is needed without external logic; incompatible pinout prevents drop-in replacement. | Select SN74ALS577ADWR only if synchronous initialization of all eight bits is mandatory and board layout accommodates 24-pin footprint. |
| SN74AS576N | Faster AS family: 125 MHz max clock, 8 ns max propagation delay; higher IOL (32 mA), but increased ICC (84–135 mA). | Suitable for ultra-high-speed bus applications but demands stricter power delivery and thermal management. | Choose SN74AS576N only when >30 MHz operation is essential and system power budget allows ~5× higher quiescent current versus SN74ALS576BNSR. |
Compared with SN74ALS577ADWR, SN74ALS576BNSR offers simpler control (no CLR) and smaller 20-pin SOP footprint; compared with SN74AS576N, it trades speed for lower power and broader voltage margin, making it optimal for cost-sensitive, thermally constrained commercial systems.
Availability
SN74ALS576BNSR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment bus interface, and legacy computer system register file applications requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74ALS576BNSR 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 SN74ALS576BNSR belongs to TI's legacy 74ALS logic family, engineered for robust, low-power, high-speed digital interfacing in commercial-grade systems where reliability and pin compatibility with established designs are critical.
FAQ
What logic family does SN74ALS576BNSR belong to, and how does it differ from standard 74LS?
SN74ALS576BNSR belongs to the Advanced Low-Power Schottky (ALS) logic family. Compared to standard 74LS, it delivers approximately 2× higher speed (30 MHz vs. ~15 MHz) and ~20% lower power consumption at the same operating frequency. Its VIH (≥2.0 V) and VIL (≤0.8 V) thresholds match 74LS, ensuring full electrical compatibility while offering improved noise immunity and tighter timing margins in SN74ALS576BNSR-based designs.
Does SN74ALS576BNSR support synchronous reset functionality?
No, SN74ALS576BNSR does not include a synchronous or asynchronous reset input. It provides only clock (CLK) and output-enable (OE) controls. For synchronous reset capability, TI offers the functionally similar SN74ALS577A, which adds a dedicated CLR input-but requires a 24-pin package and is not pin-compatible with SN74ALS576BNSR.
What is the maximum clock frequency supported by SN74ALS576BNSR, and under what conditions is it guaranteed?
SN74ALS576BNSR is characterized for up to 30 MHz maximum clock frequency across the full commercial temperature range (0°C to 70°C) and supply voltage range (4.5 V to 5.5 V), with CL = 50 pF load. This value is production-tested and guaranteed per TI's recommended operating conditions-not a characterization-only figure.
Can SN74ALS576BNSR drive standard TTL loads directly, and what output current specs confirm this?
Yes, SN74ALS576BNSR can directly drive standard TTL loads. Its guaranteed low-level output current (IOL) is 12 mA minimum at VOL ≤ 0.4 V, exceeding the 1.6 mA sink requirement of one standard TTL input. Its high-level output current (IOH) is −2.6 mA minimum at VOH ≥ 2.4 V, satisfying TTL VIH thresholds even under worst-case loading-confirming robust interfacing without external buffers in SN74ALS576BNSR applications.
Is SN74ALS576BNSR RoHS compliant, and what packaging details apply to this specific part number?
Yes, SN74ALS576BNSR is RoHS compliant, with NIPDAU (nickel-palladium-gold) lead finish and MSL Level-1 rating (unlimited floor life, peak reflow ≤ 260°C). It is supplied in a 20-pin SOP (NS) package, tape-and-reel format (2000 units per reel), with reel dimensions 330 mm diameter × 24.4 mm width and pin-1 quadrant Q1 orientation per TI's packaging specifications.
SN74ALS576BNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SO
SN74ALS576BNSR FAQ
1.How can I place an order for SN74ALS576BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS576BNSR 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 SN74ALS576BNSR reliable?
The price and inventory of SN74ALS576BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS576BNSR is usually 5 days.
3.What payment methods are accepted for SN74ALS576BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS576BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS576BNSR?
SN74ALS576BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS576BNSR 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 SN74ALS576BNSR?
For technical support, including SN74ALS576BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS576BNSR requirements.
6.How does Aetrix verify that SN74ALS576BNSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS576BNSR 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 SN74ALS576BNSR meets industry standards.
7.What is the process for return or replacement of SN74ALS576BNSR?
All SN74ALS576BNSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS576BNSR, 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 SN74ALS576BNSR part is unused and in its original packaging.
Return procedure for SN74ALS576BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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