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Texas Instruments SN74AS575NT
- Part No.:
- SN74AS575NT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS575NT.pdf
- Description:
- BUS DRIVER, AS SERIES, 8-BIT,
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
SN74AS575NT 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 at 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 serves as a bidirectional bus register in data-path buffering and I/O port expansion.
For engineers reviewing the SN74AS575NT datasheet, SN74AS575NT pinout, SN74AS575NT application, or SN74AS575NT equivalent, key selection criteria include synchronous clear functionality, high-current 3-state bus driving capability, TTL-compatible input thresholds, and PDIP-24 through-hole package compatibility with legacy board layouts.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock (CLK) transition, with separate synchronous clear (CLR) and output-enable (OE) controls. Internal logic ensures OE does not affect flip-flop state retention-data can be updated while outputs remain high-impedance.
The SN74AS575NT uses advanced Schottky (AS) bipolar technology, delivering faster propagation delays (tPLH/tPHL ≤ 9 ns) and higher drive strength than ALS variants. Its 24-pin ceramic dual-in-line (JT) or plastic DIP (NT) package supports direct bus-line interfacing without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky (AS) TTL - enables 90 MHz operation with low power-delay product vs. standard TTL. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems; absolute max 7 V prevents latch-up under transient overvoltage. |
| Max Clock Frequency | 90 MHz - supports high-speed data capture in real-time control and instrumentation buses. |
| Output Drive | IOL = 48 mA / IOH = –15 mA - directly drives heavy capacitive loads (e.g., >10 TTL inputs or 50 pF traces) without buffer stages. |
| Propagation Delay | tPLH/tPHL ≤ 9 ns @ VCC = 5 V, CL = 50 pF - ensures tight timing margins in synchronous bus architectures. |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial embedded systems where extended thermal cycling is not required. |
| Clear Function | Synchronous active-low CLR - resets all eight flip-flops on next CLK↑, enabling coordinated system initialization without asynchronous glitches. |
Pinout & Package
SN74AS575NT is supplied in a 24-pin plastic dual-in-line package (NT), 0.600-inch wide, with 0.100-inch lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead (Pb-Free RoHS-compliant per TI documentation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (1D–8D) | Asynchronous parallel data inputs; sampled on CLK↑ rising edge; TTL-compatible voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| 9 | GND | Ground reference for all internal logic and output drivers; must be low-impedance to sustain 48 mA switching currents. |
| 10 | VCC | +5 V supply; decoupling capacitor (0.1 µF ceramic) required adjacent to pin to suppress high-frequency noise from output switching. |
| 11, 12, 13, 14, 15, 16, 17, 18 | Outputs (1Q–8Q) | Noninverting 3-state buffered outputs; driven high/low when OE = L and CLK↑ occurs; tri-stated when OE = H. |
| 19 | CLK | Clock input; edge-triggered on low-to-high transition; minimum pulse width 5.5 ns ensures reliable sampling across temperature. |
| 20 | OE | Output-enable control; active-low; independent of clock and clear - allows output gating without affecting stored data. |
| 21 | CLR | Synchronous clear; active-low; resets all Q outputs to low on next CLK↑; no effect when OE = H. |
| 22, 23, 24 | NC | No internal connection - left unconnected; no routing or grounding required; avoids false signal coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state noninverting outputs | Enables direct connection to shared data buses; eliminates need for external bus transceivers in microcontroller peripheral interfaces. |
| Synchronous clear (CLR) | Allows deterministic reset of all eight registers on a controlled clock edge - critical for predictable state recovery in sequenced control logic. |
| Bus-structured pinout | Groups inputs (1D–8D) and outputs (1Q–8Q) contiguously - simplifies PCB layout, reduces trace crosstalk, and eases manual wiring in prototyping. |
| Buffered control inputs (CLK, OE, CLR) | Reduces loading on upstream drivers; supports fan-out of ≥10 LS-TTL loads without signal degradation or timing skew. |
| High-output current drive (48 mA sink) | Drives long traces, multiple TTL inputs, or LED indicators directly - avoids level-shifting or amplification stages in I/O expansion modules. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Adding parallel digital input/output capability to programmable logic controllers using ISA or STD bus backplanes. IC Role / Device Role / Timing Role: Acts as an 8-bit bidirectional data latch and bus driver, synchronizing field sensor data into the controller's address/data bus on CLK edges. Use Value: Eliminates discrete transistor arrays or additional bus buffers; leverages synchronous CLR for safe hot-swap initialization during module insertion. |
Use Scenario: Bridging modern microcontrollers to vintage 8-bit computer peripherals (e.g., Apple II, IBM PC AT expansion slots). IC Role / Device Role / Timing Role: Buffers and isolates 8-bit data lines between mismatched voltage domains and timing protocols, with OE-controlled bus arbitration. Use Value: Provides TTL-compatible 48 mA drive to meet legacy bus loading specs; NC pins simplify adapter board footprint reuse across multiple variants. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Control |
|
Use Scenario: Generating precise, synchronized digital stimulus waveforms for IC functional testing in ATE systems. IC Role / Device Role / Timing Role: Stores and clocks out preloaded test vectors via parallel load; CLK edge defines exact output transition timing. Use Value: 9 ns propagation delay and 90 MHz max clock enable sub-10 ns waveform edge placement accuracy; synchronous CLR resets pattern sequence cleanly. |
Use Scenario: Controlling solenoids, relays, and indicator LEDs in manufacturing test jigs requiring robust, noise-immune digital outputs. IC Role / Device Role / Timing Role: Serves as isolated output register, with OE enabling/disabling entire 8-bit port during safety interlock checks. Use Value: 48 mA per output drives 12 V relay coils directly; high noise immunity (VIH = 2 V, VIL = 0.8 V) prevents spurious triggering in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS575A | ALS family: lower speed (30 MHz max), lower drive (24 mA sink), higher noise margin but slower edge rates. | Preferred in low-power, noise-sensitive analog-adjacent systems where 90 MHz is unnecessary. | Select SN74ALS575A only if power budget is constrained and timing margin exceeds 3× requirement. |
| SN74AS574 | No synchronous clear; CLR pin absent; otherwise identical pinout, speed (100 MHz), and drive (48 mA). | Suitable where global register reset is handled externally (e.g., by FPGA logic or microcontroller GPIO). | Choose SN74AS574 when system-level reset coordination exists and dedicated CLR line is unavailable or unused. |
Compared with SN74ALS575A and SN74AS574, the SN74AS575NT uniquely combines 90 MHz operation, 48 mA drive, and integrated synchronous clear in a through-hole DIP package - making it optimal for legacy-replacement bus interface and test equipment designs requiring deterministic reset and high-current drive.
Availability
SN74AS575NT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and automated test fixture control requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS575NT 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 U.S.-based semiconductor innovator founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS575NT belongs to TI's legacy AS-series TTL logic family, engineered for high-speed, high-drive digital interfacing in systems where reliability, timing precision, and through-hole manufacturability remain critical.
FAQ
What is the maximum clock frequency supported by the SN74AS575NT?
The SN74AS575NT supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C, CL = 50 pF). This rating is confirmed in the switching characteristics table of the SDAS165B datasheet and applies specifically to the SN74AS575NT variant, not the ALS or military-grade versions.
Does the SN74AS575NT have a synchronous or asynchronous clear function?
The SN74AS575NT features a synchronous active-low clear (CLR) input. It resets all eight flip-flop outputs to logic low only on the next low-to-high transition of the CLK signal when CLR is held low. This behavior is explicitly defined in the function table and logic diagram for SN74AS575NT in the SDAS165B datasheet.
What package type is used for the SN74AS575NT?
The SN74AS575NT is packaged in a 24-pin plastic dual-in-line package (NT), 0.600-inch wide, with through-hole leads. This is confirmed in TI's packaging addendum and mechanical drawings, distinguishing it from DW (SOIC), JT (ceramic DIP), or FK (LCCC) variants listed for other members of the same family.
Can the SN74AS575NT drive standard TTL loads directly?
Yes, the SN74AS575NT can drive up to 10 standard TTL unit loads directly. Its guaranteed output current (IOL = 48 mA, IOH = –15 mA) exceeds the 1.6 mA sink/400 µA source requirement of one TTL load, and its VOH/VOL specifications (VOH ≥ 2.4 V, VOL ≤ 0.5 V) meet TTL voltage thresholds across temperature and supply variation.
Is the SN74AS575NT still in active production?
No - according to TI's official packaging addendum dated October 2016, SN74AS575NT is marked as OBSOLETE. TI no longer manufactures or sells this part, though Aetrix Electronics maintains legacy inventory and provides lifecycle support including cross-reference guidance and obsolescence mitigation planning for the SN74AS575NT.
SN74AS575NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 90 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):
- 142 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74AS575NT FAQ
1.How can I place an order for SN74AS575NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS575NT 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 SN74AS575NT reliable?
The price and inventory of SN74AS575NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS575NT is usually 5 days.
3.What payment methods are accepted for SN74AS575NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS575NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS575NT?
SN74AS575NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS575NT 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 SN74AS575NT?
For technical support, including SN74AS575NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS575NT requirements.
6.How does Aetrix verify that SN74AS575NT is sourced from the original manufacturer or authorized distributors?
All SN74AS575NT 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 SN74AS575NT meets industry standards.
7.What is the process for return or replacement of SN74AS575NT?
All SN74AS575NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS575NT, 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 SN74AS575NT part is unused and in its original packaging.
Return procedure for SN74AS575NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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