My Inquiry
My Account
Texas Instruments SN74AS576DWR
- Part No.:
- SN74AS576DWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS576DWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AS576DWR 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 at 0°C to 70°C with 4.5–5.5 V supply. It is used in bidirectional bus interfaces and I/O port buffering.
For engineers reviewing the SN74AS576DWR datasheet, SN74AS576DWR pinout, SN74AS576DWR application, or SN74AS576DWR equivalent, key selection criteria include its 125 MHz max clock frequency, 32 mA/48 mA IOH/IOL drive strength, 3-state timing (tPZH/tPHZ ≤ 6 ns), bus-structured 20-pin SOIC (DW) package, and compatibility with legacy AS-family logic buses.
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.
It belongs to the bipolar Advanced Schottky (AS) logic family, delivering higher speed and drive capability than ALS variants: fmax = 125 MHz vs. 30 MHz, tPLH/tPHL ≤ 8 ns vs. ≤14 ns, and IO drive up to ±48 mA. Its bus-structured pinout minimizes trace skew in parallel data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky (AS) TTL - enables high-speed operation with low power-delay product |
| Max Clock Frequency | 125 MHz - supports high-throughput synchronous data transfer in backplane and memory bus applications |
| Output Drive (IOL/IOH) | 48 mA / −15 mA - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| 3-State Enable/Disable Time | tPZH, tPHZ ≤ 6 ns - ensures fast bus turnaround and minimal contention window in shared-data systems |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails and tolerant of rail droop |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control and computing equipment |
| Package | 20-pin SOIC (DW) - surface-mount footprint with 1.27 mm pitch, JEDEC MS-013 compliant |
Pinout & Package
SN74AS576DWR uses a 20-pin SOIC (DW) package with 7.5 mm × 12.8 mm body, 2.65 mm max height, and bus-structured pinout optimized for parallel data routing. 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 to high-impedance without affecting internal flip-flop state |
| 2–9 | 1D–8D | Data inputs for eight D-type flip-flops; sampled on CLK rising edge |
| 10 | GND | Ground reference for logic and power return |
| 11 | VCC | +5 V supply pin; decoupling capacitor required near this pin for noise immunity |
| 12–19 | 1Q–8Q | Inverting 3-state outputs; Q = NOT(D) when enabled, high-Z when OE = HIGH |
| 20 | CLK | Clock input; rising-edge triggered; requires clean, monotonic transition to avoid metastability |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flops with 3-state inverting outputs | Enables compact, single-package implementation of 8-bit latch + bus driver functionality |
| Bus-structured pinout (D and Q grouped) | Reduces PCB trace length mismatch and skew in parallel data paths |
| Independent OE control with no impact on internal state | Allows concurrent data loading and bus release-critical for pipelined I/O operations |
| High-current 3-state outputs (±48 mA) | Drives up to 20 standard TTL loads directly; eliminates need for external line drivers |
| AS-family speed (125 MHz fmax) | Supports real-time data capture in high-bandwidth instrumentation and communication interfaces |
Applications
| Industrial PLC I/O Module | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Isolating and latching sensor/actuator signals in modular programmable logic controller racks. IC Role / Device Role / Timing Role: Acts as buffered input register and output latch, synchronizing field-side signals to the CPU bus clock. Use Value: High drive strength (48 mA) ensures reliable signal integrity across long backplane traces; 3-state outputs prevent bus contention during module hot-swap. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern microcontroller-based controllers. IC Role / Device Role / Timing Role: Provides level-shifted, latched, and bus-isolated data path between legacy 5 V TTL peripherals and host processor. Use Value: 125 MHz clock tolerance accommodates burst-mode transfers; bus-structured pinout simplifies layout of 8-bit data lanes. |
| Test Equipment Digital Pattern Generator | Embedded System Boot Configuration Latch |
Use Scenario: Generating precise, synchronized multi-bit stimulus waveforms for IC functional testing. IC Role / Device Role / Timing Role: Serves as high-speed output register staging pattern data from SRAM or FIFO before launch onto DUT pins. Use Value: Sub-10 ns 3-state enable/disable times minimize glitch risk during waveform transitions; AS speed ensures tight timing margins. |
Use Scenario: Capturing hardware strap settings (e.g., boot mode, memory size) at power-on reset in industrial gateways. IC Role / Device Role / Timing Role: Latches configuration jumpers or DIP-switch states into stable registers readable by firmware. Use Value: Independent OE allows firmware to read configuration without disturbing system bus; robust 5 V tolerance matches legacy strap circuitry. |
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 |
|---|---|---|---|
| SN74ALS576BDWR | ALS family: lower speed (30 MHz), reduced drive (24 mA IO), higher noise margin (VIL = 0.7 V vs. 0.8 V) | Better suited for noise-prone environments with slower buses; less suitable for >50 MHz timing-critical paths | Select SN74ALS576BDWR only if system timing budget permits longer setup/hold and lower fmax. |
| SN74AS576N | Same AS logic, identical electrical specs, but in 20-pin PDIP (N) through-hole package | Used in prototyping, legacy repair, or boards requiring through-hole assembly; incompatible with SOIC reflow processes | Choose SN74AS576N for hand-soldered evaluation or replacement in existing DIP-based designs. |
Compared with SN74ALS576BDWR and SN74AS576N, the SN74AS576DWR delivers the highest speed and drive in a surface-mount package-making it optimal for space-constrained, high-performance industrial control and test equipment where board area and timing margin are critical.
Availability
SN74AS576DWR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, digital test equipment, and embedded boot configuration circuits requiring stable component supply and long-term manufacturability.
Supply support for SN74AS576DWR 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, with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74AS576DWR belongs to TI's Advanced Schottky TTL logic portfolio, engineered for high-speed, high-drive digital interfacing in mission-critical industrial and test systems where reliability and timing precision are non-negotiable.
FAQ
What is the maximum clock frequency supported by the SN74AS576DWR?
The SN74AS576DWR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C to 70°C, CL = 50 pF). This rating is based on characterization data per MIL-STD-883 Class B and reflects the device's capability in high-speed synchronous data capture applications such as bus interfaces and pattern generators. The SN74AS576DWR achieves this performance using bipolar Advanced Schottky technology.
Does the SN74AS576DWR have a synchronous clear (CLR) input?
No, the SN74AS576DWR does not include a synchronous clear (CLR) input. It is functionally identical to the ′AS576 variant described in the SDAS065B datasheet, which lacks CLR. In contrast, the SN74ALS577A includes a dedicated synchronous CLR pin. For designs requiring reset functionality, external logic or a separate reset controller must be used with the SN74AS576DWR.
What is the meaning of "bus-structured pinout" for the SN74AS576DWR?
The bus-structured pinout of the SN74AS576DWR groups data inputs (pins 2–9) and inverted outputs (pins 12–19) contiguously on opposite sides of the 20-pin SOIC package. This arrangement minimizes trace length differences and crosstalk in parallel 8-bit data paths, reducing skew and improving signal integrity in high-speed bus applications. It also simplifies PCB layout for backplane and memory interface designs.
Can the SN74AS576DWR operate with a 3.3 V supply?
No, the SN74AS576DWR is specified only for 4.5 V to 5.5 V operation. Its Advanced Schottky TTL architecture requires full 5 V rail compliance for guaranteed logic thresholds, output voltage levels (VOH ≥ 2.4 V), and drive strength. Using 3.3 V will result in undefined behavior, insufficient noise margin, and failure to meet AC timing specifications. For 3.3 V systems, consider TI's LVC or AUC logic families instead of the SN74AS576DWR.
What is the thermal and moisture sensitivity rating of the SN74AS576DWR package?
The SN74AS576DWR is packaged in a SOIC (DW) carrier with Moisture Sensitivity Level (MSL) 1 and peak reflow temperature rated at 260°C, per JEDEC J-STD-020. It is RoHS-compliant with NiPdAu lead finish. The device may be stored indefinitely at ambient conditions without baking, and supports standard lead-free reflow profiles. Full MSL and packaging details are documented in TI's Package Option Addendum for SN74AS576DWR.
SN74AS576DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AS576DWR FAQ
1.How can I place an order for SN74AS576DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS576DWR 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 SN74AS576DWR reliable?
The price and inventory of SN74AS576DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS576DWR is usually 5 days.
3.What payment methods are accepted for SN74AS576DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS576DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS576DWR?
SN74AS576DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS576DWR 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 SN74AS576DWR?
For technical support, including SN74AS576DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS576DWR requirements.
6.How does Aetrix verify that SN74AS576DWR is sourced from the original manufacturer or authorized distributors?
All SN74AS576DWR 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 SN74AS576DWR meets industry standards.
7.What is the process for return or replacement of SN74AS576DWR?
All SN74AS576DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS576DWR, 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 SN74AS576DWR part is unused and in its original packaging.
Return procedure for SN74AS576DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AS576DWR Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
