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Texas Instruments SN74AHCT574DW
- Part No.:
- SN74AHCT574DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT574DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:908
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Product details
Overview
SN74AHCT574DW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface applications requiring TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), 5-V supply operation (4.5–5.5 V), and high-impedance output control via OE. It drives capacitive or low-impedance loads in microcontroller I/O expansion and data latching circuits.
For engineers reviewing the SN74AHCT574DW datasheet, SN74AHCT574DW pinout, SN74AHCT574DW application, or SN74AHCT574DW equivalent, key selection criteria include its 20-pin SOIC (DW) package, 8-bit transparent latch functionality with clock-edge triggering, 3-state output enable timing (tPZH/tPLZ ≤ 11.5 ns at CL = 50 pF), and industrial temperature range (–40°C to 125°C).
Technical Context
The SN74AHCT574DW implements eight independent D-type latches synchronized to the rising edge of CLK, with each Q output reflecting the corresponding D input state upon clock transition. Its 3-state outputs are controlled by a common active-low OE signal, enabling bidirectional bus sharing without external pull-ups.
It features TTL-voltage-compatible inputs that support 3.3-V-to-5-V level translation, slow edge rates to suppress output ringing, and robust ESD protection (±2000-V HBM, ±1000-V CDM). Absolute maximum ratings include VCC up to 7 V and continuous output current of ±25 mA per pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type transparent latch with 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V digital systems |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - enables direct interfacing with TTL and 3.3-V logic |
| Output Drive | ±8 mA at VOH/VOL - sufficient for driving moderate capacitive loads without signal degradation |
| Propagation Delay | tPLH/tPHL ≤ 13 ns at CL = 50 pF - supports reliable operation in 110-MHz max clock systems |
| Operating Temperature | –40°C to 125°C - qualified for industrial and extended-temperature embedded applications |
| ESD Rating | ±2000 V HBM - meets JEDEC JS-001 for robust handling in manufacturing environments |
Pinout & Package
SN74AHCT574DW uses a 20-pin SOIC (DW) package measuring 12.8 mm × 10.3 mm (body: 12.8 mm × 7.5 mm), optimized for through-hole and surface-mount PCB assembly with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low output enable - disables all Q outputs into high-impedance state when high |
| 2–9 | 1D–8D | Data inputs - latch values on rising CLK edge; TTL-compatible thresholds |
| 10 | GND | Ground reference - must be connected to system ground plane for noise immunity |
| 11 | CLK | Clock input - positive-edge-triggered; controls simultaneous latching of all 8 bits |
| 12–19 | 8Q–1Q | Tri-state outputs - driven low/high when OE is low; high-Z when OE is high |
| 20 | VCC | Power supply - requires local 0.1-μF bypass capacitor adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Supports direct connection to legacy 3.3-V and 5-V TTL logic without level shifters |
| 3-state output control | Enables shared bus architectures with no contention risk when OE is asserted |
| Slow edge rate design | Reduces output ringing and EMI in high-speed digital interconnects |
| Industrial temperature range | Validated operation from –40°C to 125°C for harsh-environment deployments |
| Low quiescent current | ICC ≤ 40 µA - minimizes static power draw in always-on I/O buffer applications |
Applications
| Microcontroller I/O Expansion | Industrial Bus Interface |
|---|---|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU in a programmable logic controller. IC Role / Device Role / Timing Role: Latches parallel data from MCU address/data bus onto isolated output lines synchronized to CLK edge. Use Value: Enables deterministic 8-bit parallel I/O handshaking with 13-ns propagation delay and 3-state isolation during bus release. |
Use Scenario: Isolating and buffering sensor data lines between analog front-end and FPGA-based processing unit. IC Role / Device Role / Timing Role: Acts as direction-controlled data register, holding sampled values until FPGA reads via shared bus. Use Value: Prevents bus contention using OE-controlled high-Z outputs and tolerates mixed-voltage signaling (3.3 V ↔ 5 V). |
| Legacy System Upgrades | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete 74LS574 in a vintage test instrument's control logic board. IC Role / Device Role / Timing Role: Provides pin-compatible 5-V CMOS replacement with identical SOIC-20 footprint and function. Use Value: Delivers lower power consumption (40 µA vs. >10 mA), improved noise margin, and extended temperature range. |
Use Scenario: Capturing and holding calibration DAC outputs in automated test equipment before ADC sampling. IC Role / Device Role / Timing Role: Synchronizes analog control signals to system clock domain while isolating downstream circuitry. Use Value: Ensures glitch-free hold timing with 1.5-ns data hold time and 3.5-ns setup relative to CLK rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT574DWR | Same silicon, tape-and-reel packaging (2000 pcs), RoHS-compliant NIPDAU finish, MSL Level-1 | Identical electrical specs and pinout; preferred for automated SMT production | Select SN74AHCT574DWR for volume manufacturing; SN74AHCT574DW is obsolete but available for legacy repair. |
| 74VHC574M | Higher speed (tPD ≈ 7.5 ns), wider VCC range (2–5.5 V), but lacks TTL input compatibility (VIH = 3.5 V min) | Suitable for 3.3-V-only systems; not drop-in for TTL-driven designs | Choose 74VHC574M only if system uses pure CMOS signaling and requires faster timing. |
Compared with SN74AHCT574DWR, the SN74AHCT574DW shares identical logic behavior and DC specs but differs in packaging status (obsolete vs. active) and sourcing traceability; versus 74VHC574M, it trades raw speed for guaranteed TTL interoperability and industrial temperature resilience.
Availability
SN74AHCT574DW is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for SN74AHCT574DW 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT574DW belongs to TI's legacy 74AHCT logic family, engineered for robust 5-V TTL-compatible interfacing in industrial control, instrumentation, and upgrade paths for obsolete bipolar logic devices.
FAQ
What is the operating temperature range for the SN74AHCT574DW?
The SN74AHCT574DW is rated for operation from –40°C to +125°C, meeting industrial-grade thermal requirements. This range is validated across all electrical parameters including propagation delay, output drive, and input thresholds, making SN74AHCT574DW suitable for deployment in harsh environments such as factory automation controllers and outdoor test equipment.
Is the SN74AHCT574DW pin-compatible with the original 74LS574?
Yes, the SN74AHCT574DW uses the same 20-pin SOIC (DW) package and identical pinout as the 74LS574, including CLK, OE, D-inputs, Q-outputs, VCC, and GND positions. However, SN74AHCT574DW offers CMOS-level power efficiency and enhanced noise immunity while maintaining TTL-compatible input thresholds - enabling direct replacement in most legacy 74LS574 designs without layout changes.
Does the SN74AHCT574DW support 3.3-V input signals?
Yes, the SN74AHCT574DW accepts 3.3-V logic levels directly: its VIH threshold is specified at 2.0 V (min), well below 3.3 V, and VIL is 0.8 V (max), ensuring reliable recognition of low states from 3.3-V sources. This makes SN74AHCT574DW ideal for 3.3-V-to-5-V level translation in mixed-voltage systems without external buffers.
What is the maximum clock frequency supported by the SN74AHCT574DW?
The SN74AHCT574DW supports a maximum clock frequency of approximately 110 MHz under typical conditions (CL = 50 pF, VCC = 5 V), derived from its worst-case propagation delay (tPLH/tPHL ≤ 13 ns) and minimum pulse width (tw ≥ 5.5 ns). For reliable timing closure, designers should verify setup/hold margins using the specified tsu = 3.5 ns and th = 1.5 ns values in their target application.
How does the output-enable (OE) function work on the SN74AHCT574DW?
The OE pin on the SN74AHCT574DW is an active-low control: when OE is low, all eight Q outputs drive high or low based on latched D-input states; when OE is high, all Q outputs enter high-impedance (Hi-Z) state, electrically disconnecting them from the bus. This allows SN74AHCT574DW to share data buses safely with other devices, eliminating contention and reducing need for external isolation components.
SN74AHCT574DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 115 MHz
- Max Propagation Delay @ V, Max CL:
- 10.6ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHCT574DW FAQ
1.How can I place an order for SN74AHCT574DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT574DW 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 SN74AHCT574DW reliable?
The price and inventory of SN74AHCT574DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT574DW is usually 5 days.
3.What payment methods are accepted for SN74AHCT574DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT574DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT574DW?
SN74AHCT574DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT574DW 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 SN74AHCT574DW?
For technical support, including SN74AHCT574DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT574DW requirements.
6.How does Aetrix verify that SN74AHCT574DW is sourced from the original manufacturer or authorized distributors?
All SN74AHCT574DW 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 SN74AHCT574DW meets industry standards.
7.What is the process for return or replacement of SN74AHCT574DW?
All SN74AHCT574DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT574DW, 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 SN74AHCT574DW part is unused and in its original packaging.
Return procedure for SN74AHCT574DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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