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Texas Instruments SN74AS576N
- Part No.:
- SN74AS576N
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS576N.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,640
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Product details
Overview
SN74AS576N from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverting outputs, designed for direct bus driving in TTL-compatible digital systems. It features clock-triggered data capture on CLK rising edge, independent output-enable (OE) control, and operates from 4.5 V to 5.5 V at 0°C to 70°C. Key parameters include 125 MHz max clock frequency, 32 mA low-level output drive, and 8 ns typical propagation delay.
For engineers reviewing the SN74AS576N datasheet, SN74AS576N pinout, SN74AS576N application, or SN74AS576N equivalent, this page delivers verified functional identity, bus-structured 20-pin PDIP package mapping, timing-critical switching specs, and validated alternatives for legacy TTL bus interface designs.
Technical Context
The SN74AS576N implements eight independent D-type latches synchronized to the rising edge of CLK, with each output inverted and individually controllable via a common 3-state OE input. Its buffered OE and CLK inputs reduce loading on upstream logic and support clean bus arbitration.
Unlike the SN74ALS577A, it lacks synchronous clear (CLR); its internal state retention is fully dependent on clocked data entry and OE-gated output enablement. All eight flip-flops share identical timing behavior, with setup time of 2 ns and hold time of 2 ns relative to CLK↑.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) TTL - ensures high-speed operation with low power-delay product vs. standard TTL |
| Max Clock Frequency | 125 MHz - supports high-throughput data latching in fast parallel bus architectures |
| Output Drive (IOL) | 48 mA - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Propagation Delay (tPLH/tPHL) | 3–9 ns - enables sub-10 ns cycle timing in synchronous bus register applications |
| Operating Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL supply rails and tolerates nominal rail variation |
| Temperature Range | 0°C to 70°C - rated for commercial-grade industrial and computing environments |
| 3-State Enable Time (tPZL) | 3–10 ns - allows rapid bus release for time-multiplexed shared-data-path operation |
Pinout & Package
SN74AS576N is supplied in a 20-pin plastic dual in-line package (PDIP-N), with 300-mil width and through-hole mounting. Pinout follows bus-structured layout optimized for PCB trace routing in parallel data paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control enabling/disabling all eight 3-state outputs simultaneously; does not affect internal latch state |
| 2–9 | 1D–8D | Data inputs for each of eight D-type flip-flops; sampled on CLK rising edge |
| 10 | GND | Ground reference for logic and power return path |
| 11 | VCC | +5 V supply pin; decoupling capacitor placement critical for noise immunity |
| 12–19 | 1Q–8Q | Inverted latched outputs; high-impedance when OE = HIGH |
| 20 | CLK | Clock input triggering edge-sensitive data capture; requires clean, monotonic rising transition |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Inverting Outputs | Enables bidirectional bus sharing without external direction control logic |
| Bus-Structured Pinout | Minimizes PCB trace crossovers and simplifies layout for 8-bit parallel interfaces |
| Buffered Control Inputs | Reduces fanout loading on clock and OE drivers, improving signal integrity in dense logic arrays |
| Rising-Edge Triggering | Synchronizes data capture precisely to system clock edges, eliminating metastability in pipelined designs |
| AS Logic Speed Grade | Delivers 125 MHz operation - 4× faster than standard 74LS, suitable for high-bandwidth I/O buffering |
Applications
| Parallel Bus Interface | Microprocessor I/O Port |
|---|---|
Use Scenario: Interfacing a microcontroller's 8-bit data bus to external memory or peripheral ICs with strict timing margins. IC Role / Device Role / Timing Role: Acts as a registered, inverting bus buffer that isolates the CPU from load capacitance while providing edge-aligned data staging. Use Value: Enables reliable 125 MHz burst transfers by meeting tight 2 ns setup/hold windows and driving 48 mA per line. | Use Scenario: Expanding GPIO capability in embedded controllers where native port pins are insufficient or lack latching. IC Role / Device Role / Timing Role: Functions as an output port latch, holding data stable between CPU write cycles and peripheral read operations. Use Value: Provides non-volatile data retention across bus cycles via internal D-flip-flop storage, eliminating need for software polling. |
| Bidirectional Data Transceiver | Legacy System Bus Driver |
Use Scenario: Implementing half-duplex communication between two processors sharing a single 8-bit data highway. IC Role / Device Role / Timing Role: Serves as a direction-controlled, 3-state transceiver - OE asserts to transmit, deasserts to receive (high-Z). Use Value: Eliminates discrete direction logic and reduces component count versus discrete buffer + gate solutions. | Use Scenario: Replacing obsolete 74S or 74F-series octal latches in aging industrial control backplanes. IC Role / Device Role / Timing Role: Performs drop-in function replacement with improved speed, lower power, and guaranteed 5 V TTL compatibility. Use Value: Restores system reliability with 125 MHz margin over original 30–50 MHz spec, extending service life of legacy hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS576BN | ALS family: lower speed (30 MHz max), reduced IOL (24 mA), higher noise immunity, lower ICC (15–24 mA) | Preferred for low-power, noise-sensitive environments where 125 MHz is unnecessary | Select when thermal budget or EMI constraints outweigh speed requirements |
| SN74AS576DW | Same AS logic, identical specs, but in SOIC-20 surface-mount package (2.65 mm height) | Required for automated SMT assembly; incompatible with through-hole PCB footprints | Choose for new designs targeting volume production and space-constrained layouts |
Compared with SN74ALS576BN and SN74AS576DW, the SN74AS576N delivers maximum speed and drive strength in a through-hole package - making it optimal for prototyping, repair, and legacy board upgrades where socket compatibility and hand-soldering are essential.
Availability
SN74AS576N is available at Aetrix Electronics and suitable for industrial control backplanes, legacy test equipment interfaces, and microprocessor expansion modules requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74AS576N 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 SN74AS576N belongs to TI's legacy 74AS logic family, engineered specifically for high-speed, robust TTL-compatible bus interfacing in mission-critical computing and control systems.
FAQ
What is the primary function of the SN74AS576N in a digital system?
The SN74AS576N functions as an octal D-type edge-triggered flip-flop with 3-state inverting outputs, primarily used for latching and driving parallel data buses. It captures data on the rising edge of CLK and places inverted, registered outputs onto a shared bus when OE is asserted low. Its design targets high-speed bus isolation and synchronization in TTL-based systems, and the SN74AS576N maintains full compatibility with standard 5 V logic families while delivering 125 MHz performance.
Does the SN74AS576N include a reset or clear function?
No, the SN74AS576N does not include a reset or clear input. Unlike the SN74ALS577A, which features a synchronous CLR pin, the SN74AS576N relies solely on clocked data entry and output enable control. Internal state is retained only through successive CLK↑ transitions; there is no dedicated mechanism to asynchronously or synchronously force all flip-flops to a known state. This makes the SN74AS576N appropriate for applications where state persistence between cycles is required, and the SN74AS576N must be initialized via controlled data writes.
What are the absolute maximum ratings for the SN74AS576N?
The SN74AS576N has an absolute maximum supply voltage (VCC) of 7 V, input voltage (VI) of 7 V, and voltage applied to a disabled 3-state output of 5.5 V. The operating free-air temperature range is 0°C to 70°C, and the storage temperature range is −65°C to 150°C. Exceeding any of these ratings may cause permanent damage. These stress limits do not imply functional operation - the SN74AS576N is only guaranteed to meet specifications within its recommended operating conditions of 4.5 V to 5.5 V supply and 0°C to 70°C ambient.
Can the SN74AS576N drive multiple TTL inputs directly?
Yes, the SN74AS576N can drive multiple standard TTL inputs directly due to its strong output drive capability: 48 mA sink current (IOL) and 15 mA source current (IOH). This exceeds the combined input current requirements of up to 20 standard TTL gates (each drawing ~1.6 mA for a LOW input), enabling fanout without external buffers. The SN74AS576N's low VOL (0.33 V max at 48 mA) and high VOH (2.4 V min at 15 mA) ensure valid logic levels across full load, making it ideal for dense bus environments.
Is the SN74AS576N pin-compatible with other members of the 74xx576 family?
Yes, the SN74AS576N is pin-compatible with SN74ALS576BN and SN74AS576DW in terms of signal assignment and 20-pin layout - all share identical pin functions (OE, D1–D8, GND, VCC, Q1–Q8, CLK). However, electrical behavior differs: SN74AS576N offers higher speed and drive strength than ALS variants, and the DW version uses a surface-mount SOIC package. Mechanical compatibility is limited to PDIP sockets; the SN74AS576N cannot be substituted for ceramic DIP (J) or LCCC (FK) variants without footprint changes.
SN74AS576N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 125 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AS576N FAQ
1.How can I place an order for SN74AS576N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS576N 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 SN74AS576N reliable?
The price and inventory of SN74AS576N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS576N is usually 5 days.
3.What payment methods are accepted for SN74AS576N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS576N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS576N?
SN74AS576N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS576N 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 SN74AS576N?
For technical support, including SN74AS576N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS576N requirements.
6.How does Aetrix verify that SN74AS576N is sourced from the original manufacturer or authorized distributors?
All SN74AS576N 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 SN74AS576N meets industry standards.
7.What is the process for return or replacement of SN74AS576N?
All SN74AS576N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS576N, 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 SN74AS576N part is unused and in its original packaging.
Return procedure for SN74AS576N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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