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Texas Instruments SN74AS575DW
- Part No.:
- SN74AS575DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74AS575DW.pdf
- Description:
- BUS DRIVER, AS SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:186
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Product details
Overview
SN74AS575DW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, synchronous clear (CLR), and bus-structured pinout. It operates from 4.5 V to 5.5 V, supports up to 90 MHz clock frequency, delivers ±48 mA output drive, and is rated for 0°C to 70°C industrial temperature range. It is used in bidirectional bus driver circuits and I/O port buffering in legacy digital systems.
For engineers reviewing the SN74AS575DW datasheet, SN74AS575DW pinout, SN74AS575DW application, or SN74AS575DW equivalent, key selection criteria include synchronous clear functionality, 24-pin SOIC-DW package compatibility, 3-state output timing (tPZH = 2 ns), high-current drive capability, and TTL-compatible input thresholds.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock transition, with separate synchronous active-low CLR controlling all flip-flops simultaneously. Output-enable (OE) is asynchronous and does not affect internal state retention or data capture.
The SN74AS575DW uses advanced Schottky (AS) bipolar technology, delivering faster propagation delays (tPLH/tPHL ≤ 11 ns) and higher output current than ALS variants. Its bus-structured pinout minimizes trace crossovers in PCB layout for parallel data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL Advanced Schottky (AS) - enables 90 MHz operation with low power-delay product |
| Function | Octal D-type edge-triggered flip-flop with synchronous clear and 3-state noninverting outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS mixed-signal systems |
| Max Clock Frequency | 90 MHz - supports high-speed data latching in bus arbitration and interface logic |
| Output Drive | IOL = 48 mA / IOH = –15 mA - directly drives heavy capacitive loads or multiple TTL inputs |
| Propagation Delay | tPLH/tPHL ≤ 11 ns @ VCC = 5 V, CL = 50 pF - ensures tight timing margins in synchronous designs |
| Operating Temp | 0°C to 70°C - qualified for commercial/industrial board-level applications |
Pinout & Package
SN74AS575DW is housed in a 24-pin SOIC (DW) package with 300-mil width and 2.65 mm max height, compliant with JEDEC MS-013 and TI's DW0020A mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (1D–8D) | Asynchronous D inputs for each of eight flip-flops; sampled on CLK↑ |
| 9 | GND | Ground reference for all logic and output stages |
| 10 | VCC | Positive supply (4.5–5.5 V); decoupling required near pin |
| 11, 12, 13, 14, 15, 16, 17, 18 | Outputs (1Q–8Q) | Noninverting 3-state buffered outputs; controlled by OE and CLK |
| 19 | CLK | Global clock input; rising-edge sensitive for data capture |
| 20 | OE | Active-low output enable; disables outputs without affecting internal state |
| 21 | CLR | Active-low synchronous clear; resets all eight Q outputs to low on next CLK↑ |
| 22, 23, 24 | NC | No internal connection - must be left unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Clear (CLR) | Resets all eight outputs to logic low on next clock edge - eliminates need for external reset sequencing logic |
| Bus-Structured Pinout | Input and output pins arranged to minimize PCB trace crossovers in 8-bit parallel interfaces |
| Asynchronous Output Enable (OE) | Allows outputs to enter high-impedance state independently of clock or data - enables dynamic bus sharing |
| High-Current 3-State Outputs | 48 mA sink / 15 mA source capability - drives long traces or multiple TTL loads without buffers |
| AS Technology Performance | 90 MHz max clock and sub-12 ns propagation delay - exceeds ALS family speed while maintaining TTL compatibility |
Applications
| Microprocessor Bus Interface | Digital I/O Expansion |
|---|---|
Use Scenario: Interfacing an 8-bit microprocessor data bus to peripheral devices requiring latch-controlled handshaking. IC Role / Device Role / Timing Role: Acts as a data latch and bus driver between CPU and memory-mapped peripherals; captures data on CLK↑ and presents it via 3-state outputs under OE control. Use Value: Eliminates need for discrete gating logic; synchronous CLR allows coordinated reset of all peripheral registers during system initialization. | Use Scenario: Expanding GPIO count on an embedded controller using parallel port expansion. IC Role / Device Role / Timing Role: Provides eight programmable output bits with simultaneous update and tri-state isolation for shared bus access. Use Value: Enables hot-swappable I/O modules via OE-controlled bus release; high drive strength supports LED arrays or relay drivers directly. |
| Bidirectional Data Transceiver | Working Register File |
Use Scenario: Implementing half-duplex communication between two subsystems sharing a common 8-bit data path. IC Role / Device Role / Timing Role: Latches transmitted data on one side while presenting received data on the other; OE direction control replaces dedicated transceiver ICs. Use Value: Reduces component count vs. dual 74AS245; synchronous CLR ensures deterministic startup state across both directions. | Use Scenario: Storing intermediate computation results in a fixed-function digital signal processing pipeline. IC Role / Device Role / Timing Role: Functions as a working register bank where data is loaded, held, and conditionally updated on clock edges. Use Value: Retains valid data during OE assertion - allows background processing while preserving register contents for readback. |
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 |
|---|---|---|---|
| SN74AS574DW | No synchronous clear; only CLK and OE controls - requires external reset circuitry | Suitable where independent register reset is unnecessary or handled at system level | Select when synchronous CLR is not required and lower complexity is preferred |
| SN74ALS575ADW | ALS family: lower speed (30 MHz max), reduced drive (24 mA sink), higher propagation delay (14 ns) | Compatible pinout but slower - appropriate for cost-sensitive, lower-frequency legacy upgrades | Select for drop-in replacement where timing budget permits relaxed specs |
Compared with SN74AS575DW, SN74AS574DW lacks synchronous reset but offers identical speed and drive; SN74ALS575ADW retains pin compatibility but trades performance for lower power and cost in less demanding applications.
Availability
SN74AS575DW is available at Aetrix Electronics and suitable for microprocessor bus interfaces, digital I/O expansion, bidirectional data transceivers, and working register files requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS575DW 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 SN74AS575DW belongs to TI's legacy TTL logic portfolio, designed specifically for high-speed, robust bus interfacing in industrial control, test equipment, and retro-computing systems requiring reliable 5 V logic.
FAQ
What is the function of the CLR pin on the SN74AS575DW?
The CLR (clear) pin on the SN74AS575DW is an active-low synchronous input that resets all eight Q outputs to logic low on the next rising edge of CLK. Unlike asynchronous clear, it does not immediately force outputs low - it waits for the clock edge, ensuring predictable timing behavior within synchronous systems. This feature is unique to the '575 variant and distinguishes it from the '574 series.
Does the SN74AS575DW support hot insertion or live bus swapping?
The SN74AS575DW supports controlled bus sharing via its 3-state outputs but is not rated for hot insertion. Its absolute maximum rating for voltage applied to a disabled output is 5.5 V, and no built-in bus-fault protection or power-up/down sequencing is specified. For live bus swapping, external current-limiting resistors and careful OE timing coordination are required - the SN74AS575DW itself does not provide hot-swap circuitry.
Can the SN74AS575DW replace the SN74ALS575A in an existing design?
Yes, the SN74AS575DW can replace the SN74ALS575A on a pin-for-pin basis in the same DW package, provided timing and drive requirements allow. The AS version offers higher speed (90 MHz vs. 30 MHz), stronger output drive (48 mA vs. 24 mA), and tighter propagation delays. Verify setup/hold times and clock pulse widths meet AS specifications, as they differ significantly from ALS.
What are the NC pins on the SN74AS575DW, and how should they be handled?
Pins 22, 23, and 24 on the SN74AS575DW are marked NC (no internal connection) and must remain unconnected in the PCB layout. They serve no electrical function and are not tied to VCC, GND, or any internal node. Leaving them floating is safe; routing traces or applying solder paste to these pads is unnecessary and may risk shorts or contamination.
Is the SN74AS575DW still in active production?
No - according to TI's official packaging addendum dated October 2016, SN74AS575DW is marked as OBSOLETE. TI discontinued production and no longer accepts new orders. Aetrix Electronics maintains limited legacy stock with full traceability and provides lifecycle coordination support, including cross-reference guidance and last-time-buy planning for ongoing production needs.
SN74AS575DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AS575DW FAQ
1.How can I place an order for SN74AS575DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS575DW 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 SN74AS575DW reliable?
The price and inventory of SN74AS575DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS575DW is usually 5 days.
3.What payment methods are accepted for SN74AS575DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS575DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS575DW?
SN74AS575DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS575DW 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 SN74AS575DW?
For technical support, including SN74AS575DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS575DW requirements.
6.How does Aetrix verify that SN74AS575DW is sourced from the original manufacturer or authorized distributors?
All SN74AS575DW 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 SN74AS575DW meets industry standards.
7.What is the process for return or replacement of SN74AS575DW?
All SN74AS575DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS575DW, 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 SN74AS575DW part is unused and in its original packaging.
Return procedure for SN74AS575DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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