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Texas Instruments SN74AHCT574PW
- Part No.:
- SN74AHCT574PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT574PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:193
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Product details
Overview
SN74AHCT574PW 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 SN74AHCT574PW datasheet, SN74AHCT574PW pinout, SN74AHCT574PW application, or SN74AHCT574PW equivalent, key selection criteria include its 20-pin TSSOP 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 SN74AHCT574PW 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 single active-low OE input, enabling bidirectional bus driving without external pull-ups.
It features TTL-voltage-compatible inputs for seamless 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). The device operates within strict recommended conditions: VCC = 4.5–5.5 V, VI = 0–5.5 V, and IOH/IOL = ±8 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type transparent latch with 3-state outputs, edge-triggered on CLK rising edge |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V digital systems and stable noise margin |
| Input Compatibility | TTL-level inputs (VIH = 2 V min, VIL = 0.8 V max) - enables direct interfacing with legacy 5-V TTL logic |
| Output Drive | ±8 mA per output at VCC = 4.5 V - sufficient for driving moderate-capacitance buses without signal degradation |
| Propagation Delay | tPLH/tPHL ≤ 13 ns at CL = 50 pF - supports reliable operation in 10-MHz+ synchronous bus environments |
| Operating Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood applications |
| ESD Rating | ±2000 V HBM, ±1000 V CDM - exceeds JEDEC standards for robust handling in automated assembly |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 0.65-mm lead pitch, surface-mount, RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable (active-low) | Asserting low places all eight Q outputs in high-impedance state; critical for bus arbitration and multi-driver systems |
| 2–9 (1D–8D) | Data inputs | Asynchronous inputs sampled on CLK rising edge; TTL-compatible thresholds simplify interface with mixed-voltage logic |
| 10 (GND) | Ground reference | Common return path for all internal circuitry; must be low-impedance to minimize ground bounce during switching |
| 11 (CLK) | Clock input | Rising-edge-sensitive control signal; determines latch timing; requires clean, monotonic transitions per Δt/Δv ≤ 20 ns/V spec |
| 12–19 (8Q–1Q) | Tri-state outputs | Driven outputs reflect latched D values when OE is low; high-Z state isolates bus lines during contention or idle periods |
| 20 (VCC) | Power supply | 5-V nominal supply; requires local 0.1-μF bypass capacitor to suppress switching noise and ensure stable internal biasing |
Key Features
| Feature | Design Value |
|---|---|
| TTL-input compatibility | VIH = 2 V min / VIL = 0.8 V max enables direct connection to legacy 5-V TTL outputs without level-shifting circuitry |
| Controlled output edge rate | Slower rise/fall times reduce overshoot and undershoot on PCB traces, minimizing EMI and signal integrity issues |
| High-impedance 3-state outputs | OE-controlled tri-state capability allows safe sharing of common data buses among multiple drivers without contention |
| Industrial temperature range | Specified operation from –40°C to +125°C supports deployment in harsh environments including power infrastructure and motor controls |
| Robust ESD protection | ±2000-V HBM and ±1000-V CDM ratings exceed JEDEC requirements, reducing field failure risk during handling and assembly |
Applications
| Microcontroller I/O Expansion | Industrial Bus Interface |
|---|---|
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU in a programmable logic controller (PLC) module. IC Role / Device Role / Timing Role: Latches parallel data from MCU address/data bus onto isolated I/O lines synchronized to system clock edge. Use Value: Enables 8-bit parallel port extension with precise timing control and bus isolation via OE, eliminating need for discrete buffers or level shifters. |
Use Scenario: Interfacing a 5-V FPGA configuration bus to a 3.3-V host processor in a network switch management subsystem. IC Role / Device Role / Timing Role: Acts as a level-translating latch between mismatched voltage domains while preserving signal integrity on shared control lines. Use Value: TTL-compatible inputs accept 3.3-V logic highs directly; 3-state outputs prevent back-driving during FPGA reconfiguration sequences. |
| Consumer Display Data Buffering | Automotive Body Control Module |
|
Use Scenario: Holding pixel data for a segment-driven LCD panel in a smart thermostat display unit. IC Role / Device Role / Timing Role: Captures burst-mode video data from a serial-to-parallel converter and holds stable output during display refresh cycles. Use Value: Low propagation delay (<13 ns) ensures accurate timing alignment with display controller strobes; high drive strength sustains signal integrity across flexible PCB traces. |
Use Scenario: Isolating sensor input signals (e.g., door lock status, window position) from a central body control unit in a vehicle platform. IC Role / Device Role / Timing Role: Provides electrically isolated latched inputs with fail-safe high-impedance state during power-up or reset sequences. Use Value: Industrial temp rating (–40°C to +125°C) ensures reliability under hood; OE pin allows centralized bus disable during diagnostic mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT574PWR | Same silicon die and electrical specs; differs only in packaging - tape-and-reel (2000 pcs) vs. tube (obsolete PW variant) | Identical functional behavior and pinout; suitable for new designs requiring volume procurement and automated placement | Select SN74AHCT574PWR for production builds; SN74AHCT574PW is obsolete and no longer stocked by TI. |
| 74LVC574APW | 3.3-V-only operation (1.65–3.6 V), lower drive (±24 mA), higher speed (tPD ≈ 5.3 ns), and different input thresholds (VIH = 2.0 V @ VCC = 3.3 V) | Requires level-shifting for 5-V systems; better suited for low-power, high-speed 3.3-V FPGA or ASIC interfaces | Choose 74LVC574APW only when migrating to 3.3-V logic domains; not drop-in compatible with SN74AHCT574PW due to supply and voltage threshold mismatch. |
Compared with SN74AHCT574PW, SN74AHCT574PWR offers identical performance in a currently available package format, while 74LVC574APW provides faster timing and lower voltage operation but mandates system-level voltage domain changes and is not functionally interchangeable in 5-V applications.
Availability
SN74AHCT574PW is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and consumer display buffering requiring stable component supply and long-term lifecycle support.
Supply support for SN74AHCT574PW 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 connectivity technologies, with over 90 years of innovation in high-reliability IC design.
The SN74AHCT574PW belongs to TI's legacy 74AHCT logic family, engineered for robust 5-V TTL-compatible interfacing in industrial and automotive systems where noise immunity and wide temperature operation are critical.
FAQ
What is the operating voltage range for the SN74AHCT574PW?
The SN74AHCT574PW operates over a supply voltage range of 4.5 V to 5.5 V, as specified in the Recommended Operating Conditions table. This ensures compatibility with standard 5-V digital systems while maintaining adequate noise margins and stable logic thresholds. Operation outside this range may result in undefined behavior or reduced reliability.
Does the SN74AHCT574PW support 3.3-V input logic levels?
Yes, the SN74AHCT574PW supports 3.3-V input logic levels due to its TTL-compatible input thresholds: VIH is guaranteed ≥2.0 V and VIL ≤0.8 V at VCC = 4.5–5.5 V. This allows direct interfacing with 3.3-V microcontrollers and FPGAs without external level shifters, making it ideal for mixed-voltage system integration.
What is the maximum output current per pin on the SN74AHCT574PW?
The SN74AHCT574PW delivers ±8 mA per output pin under recommended operating conditions (VCC = 4.5 V, TA = –40°C to 125°C). This drive strength is optimized for driving moderately capacitive buses (e.g., up to 50 pF) while limiting ground bounce and EMI. Total device output current should not exceed ±75 mA.
Is the SN74AHCT574PW pin-compatible with other packages in the same family?
Yes, the SN74AHCT574PW shares identical pinout and functionality with other 20-pin variants including SN74AHCT574DBR (SSOP), SN74AHCT574DWR (SOIC), and SN74AHCT574N (PDIP). All adhere to the standard 74-series pin assignment for octal latches, enabling layout reuse across package types when thermal or space constraints permit.
What does the 'PW' suffix indicate in SN74AHCT574PW?
The 'PW' suffix denotes the TSSOP-20 (Thin Shrink Small Outline Package) variant of the SN74AHCT574PW, featuring a 6.50 mm × 6.40 mm body size, 0.65-mm lead pitch, and surface-mount construction. Though SN74AHCT574PW itself is marked obsolete in TI's packaging addendum, its pinout and electrical behavior remain identical to the active SN74AHCT574PWR variant.
SN74AHCT574PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74AHCT574PW FAQ
1.How can I place an order for SN74AHCT574PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT574PW 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 SN74AHCT574PW reliable?
The price and inventory of SN74AHCT574PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT574PW is usually 5 days.
3.What payment methods are accepted for SN74AHCT574PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT574PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT574PW?
SN74AHCT574PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT574PW 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 SN74AHCT574PW?
For technical support, including SN74AHCT574PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT574PW requirements.
6.How does Aetrix verify that SN74AHCT574PW is sourced from the original manufacturer or authorized distributors?
All SN74AHCT574PW 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 SN74AHCT574PW meets industry standards.
7.What is the process for return or replacement of SN74AHCT574PW?
All SN74AHCT574PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT574PW, 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 SN74AHCT574PW part is unused and in its original packaging.
Return procedure for SN74AHCT574PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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