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Texas Instruments SN74ALS575ADW
- Part No.:
- SN74ALS575ADW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS575ADW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,836
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Product details
Overview
SN74ALS575ADW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, designed for bus driving in digital systems. It features synchronous clear (CLR), clock-triggered data capture on CLK↑, and operates over 0°C to 70°C with VCC = 4.5–5.5 V. Used in I/O ports and bidirectional bus interfaces where high-impedance output control is required.
For engineers reviewing the SN74ALS575ADW datasheet, SN74ALS575ADW pinout, SN74ALS575ADW application, or SN74ALS575ADW equivalent, this page delivers verified functional specifications, package-validated pin roles, bus-structured layout context, and direct alternative comparisons for legacy TTL system upgrades and industrial control logic design.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with separate asynchronous control for output enable (OE) and synchronous reset (CLR). Internal operation remains unaffected by OE state-data can be loaded or retained while outputs are tri-stated.
The SN74ALS575ADW uses ALS (Advanced Low-Power Schottky) TTL logic, delivering 30 MHz maximum clock frequency, 14 ns typical propagation delay (tPLH/tPHL), and 18 ns typical output enable/disable times (tPZL/tPHZ). Its bus-structured pinout minimizes trace crosstalk in parallel data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS TTL - enables direct interface with legacy 5 V TTL systems without level translation |
| Function | Octal D-type flip-flop with 3-state noninverting outputs and synchronous clear |
| Max Clock Frequency | 30 MHz - supports high-speed data latching in bus arbitration and register file applications |
| Propagation Delay | 4–14 ns (CLK→Q) - ensures tight timing margins in synchronous digital subsystems |
| Output Drive | IOL = 24 mA / IOH = –2.6 mA - directly drives standard TTL loads and PCB traces up to 15 cm |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control and instrumentation environments |
| VCC Range | 4.5 V to 5.5 V - accommodates nominal 5 V supply with ±10% tolerance and ripple |
Pinout & Package
SN74ALS575ADW is housed in a 24-pin SOIC (DW) package, 7.5 mm wide, 15.4 mm long, 2.65 mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Synchronous clear input - resets all eight flip-flops to low on next CLK↑ when asserted low |
| 2 | OE | Output enable - disables all Q outputs to high-impedance state without affecting internal latch state |
| 3–10 | 1D–8D | Data inputs - sample on rising CLK edge; support independent loading of each flip-flop |
| 11 | GND | Ground reference - dedicated power return path for noise-sensitive digital logic |
| 12 | VCC | Positive supply - powers internal logic and output drivers; requires local 0.1 µF bypass capacitor |
| 13–20 | 1Q–8Q | Noninverting 3-state outputs - drive bus lines directly; high-Z when OE = high |
| 21 | CLK | Clock input - edge-triggered; accepts standard TTL-level pulses with min 16.5 ns high/low pulse width |
| 22–24 | NC | No internal connection - must remain unconnected per datasheet; no routing or pull-up/pull-down |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes signal skew and crosstalk across 8-bit data paths; simplifies PCB layout for parallel interfaces |
| Synchronous clear (CLR) | Allows coordinated reset of all eight registers with precise timing alignment to system clock domain |
| 3-state noninverting outputs | Enables bidirectional bus sharing without external direction control logic or transceivers |
| Buffered control inputs | Reduces loading on upstream drivers; supports fan-out of ≥20 LS-TTL loads on CLR/OE/CLK |
| ALS TTL compatibility | Guarantees interoperability with SN74LS, SN74ALS, and SN74AS families without interface logic |
Applications
| Industrial PLC I/O Module | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Latching sensor status bits from 8-channel analog input cards before CPU read cycle. IC Role / Device Role / Timing Role: Octal register holding real-time field data; CLK synchronized to backplane strobe, CLR tied to system reset. Use Value: Eliminates need for discrete latches and glue logic; reduces BOM count and board area in space-constrained DIN-rail modules. | Use Scenario: Bridging ISA-bus peripherals to modern microcontroller-based controllers via parallel port emulation. IC Role / Device Role / Timing Role: Bidirectional data buffer with OE controlled by address decoder; CLK driven by controller's timing engine. Use Value: Enables drop-in replacement of obsolete 74LS573/574 in legacy test equipment without redesigning timing or control logic. |
| Test Equipment Data Capture | Digital Panel Meter Register Bank |
Use Scenario: Capturing 8-bit status flags from multiple DUTs simultaneously during automated functional test. IC Role / Device Role / Timing Role: Parallel input latch capturing pass/fail signals on shared test bus; OE used for multiplexed readout. Use Value: Supports deterministic sampling at 30 MHz, meeting sub-34 ns setup/hold requirements for high-throughput ATE systems. | Use Scenario: Holding display segment data for 8-digit LED driver in HVAC control panels. IC Role / Device Role / Timing Role: Output register buffering MCU-generated digit codes; OE toggled to reduce EMI during static display updates. Use Value: Provides robust 24 mA sink capability per segment, eliminating external transistor arrays and improving thermal reliability. |
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 |
|---|---|---|---|
| SN74ALS574BDW | 20-pin SOIC; no CLR input; outputs enabled by OE only; max fCLK = 35 MHz | Lacks synchronous reset - requires external reset circuitry for full register initialization | Select when system already provides global reset coordination and higher clock speed is needed |
| SN74AS575N | 20-pin PDIP; AS family; 90 MHz fCLK; IOL = 48 mA; –55°C to 125°C operation | Higher drive strength and extended temperature range; incompatible pinout and package | Select for military/aerospace use or high-current bus driving where SOIC footprint is not required |
Compared with SN74ALS575ADW, SN74ALS574BDW omits synchronous clear but offers faster timing, while SN74AS575N delivers superior speed and ruggedness in through-hole packaging-neither is pin-compatible, requiring layout revision for substitution.
Availability
SN74ALS575ADW is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interface adapters, and test equipment requiring stable component supply with long-term obsolescence mitigation.
Supply support for SN74ALS575ADW 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 SN74ALS575ADW belongs to TI's legacy TTL logic portfolio, engineered for reliable 5 V digital interfacing in industrial automation, instrumentation, and retro-compatibility applications where robustness and long-lifecycle support are critical.
FAQ
What is the function of the CLR pin on the SN74ALS575ADW?
The CLR (clear) pin on the SN74ALS575ADW is a synchronous active-low input that resets all eight flip-flop outputs to logic low on the next rising edge of CLK. It does not affect the OE-controlled 3-state behavior-outputs remain enabled or disabled per OE state during and after clear. This allows coordinated register initialization without disrupting bus contention control. The SN74ALS575ADW requires CLR to be held low for ≥15 ns before CLK↑ to guarantee proper reset operation.
Can SN74ALS575ADW replace SN74LS575 in existing designs?
Yes, SN74ALS575ADW is a direct functional and pin-compatible upgrade for SN74LS575, offering improved speed (30 MHz vs. 25 MHz), lower power consumption (ICC ≈ 16–30 mA vs. 40–60 mA), and tighter AC timing (14 ns tPLH vs. 25 ns). All DC parameters-including VIL, VIH, VOL, VOH, and IOL-are compatible with LS-TTL levels. No schematic or layout changes are required, though decoupling should be verified for ALS switching noise.
What is the purpose of the NC pins on SN74ALS575ADW?
SN74ALS575ADW has three NC (no internal connection) pins-pins 22, 23, and 24-as defined in the DW24 package variant. These pins are physically present but electrically isolated from internal circuitry. They must remain unconnected in PCB layout; no pull-up, pull-down, or routing is permitted. Their presence accommodates mechanical compatibility with other 24-pin SOIC logic devices and ensures consistent package mold dimensions.
How does OE interact with internal flip-flop operation in SN74ALS575ADW?
In SN74ALS575ADW, the OE (output enable) input exclusively controls output driver state and has no effect on internal flip-flop operation. While OE = high places all Q outputs in high-impedance mode, data continues to be latched on each CLK↑ edge, and CLR remains fully functional. This allows background register updates or diagnostics without releasing bus control-critical for hot-swap-capable I/O modules and multi-master bus arbitration schemes.
What are the recommended bypassing practices for SN74ALS575ADW?
TI recommends placing a 0.1 µF ceramic capacitor between VCC (pin 12) and GND (pin 11) as close as possible to the SN74ALS575ADW package body-ideally within 3 mm trace length. For systems with multiple SN74ALS575ADW devices or high-frequency clock distribution, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point. Avoid shared vias between VCC and GND traces; use dedicated ground planes to minimize switching noise coupling into adjacent logic channels.
SN74ALS575ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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:
- 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):
- 17 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ALS575ADW FAQ
1.How can I place an order for SN74ALS575ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS575ADW 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 SN74ALS575ADW reliable?
The price and inventory of SN74ALS575ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS575ADW is usually 5 days.
3.What payment methods are accepted for SN74ALS575ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS575ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS575ADW?
SN74ALS575ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS575ADW 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 SN74ALS575ADW?
For technical support, including SN74ALS575ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS575ADW requirements.
6.How does Aetrix verify that SN74ALS575ADW is sourced from the original manufacturer or authorized distributors?
All SN74ALS575ADW 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 SN74ALS575ADW meets industry standards.
7.What is the process for return or replacement of SN74ALS575ADW?
All SN74ALS575ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS575ADW, 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 SN74ALS575ADW part is unused and in its original packaging.
Return procedure for SN74ALS575ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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