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Texas Instruments CD74HCT574QPWREP
- Part No.:
- CD74HCT574QPWREP
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD74HCT574QPWREP.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,996
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Product details
Overview
CD74HCT574QPWREP from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus-hold and data latching in industrial control and instrumentation systems. It operates from 4.5 V to 5.5 V, features 15 ns typical propagation delay (VCC = 5 V, CL = 15 pF), supports −40°C to 125°C extended temperature range, and drives up to 15 LSTTL loads.
For engineers reviewing the CD74HCT574QPWREP datasheet, CD74HCT574QPWREP pinout, CD74HCT574QPWREP application, or CD74HCT574QPWREP equivalent, key selection criteria include its 3-state output enable independence, LSTTL/CMOS input compatibility, low-power HCT logic family performance, and TSSOP-20 packaging for high-density PCB layouts.
Technical Context
The CD74HCT574QPWREP implements eight independent D-type flip-flops triggered on the low-to-high clock transition, with asynchronous 3-state output control via a dedicated OE pin. Its buffered inputs ensure stable logic thresholds across temperature, and its balanced propagation/transition times minimize skew in synchronous bus interfaces.
This device uses silicon-gate CMOS technology for TTL-compatible input levels (VIH = 2 V min, VIL = 0.8 V max) and rail-to-rail output swing, enabling direct interfacing with legacy LSTTL systems while consuming significantly less power than equivalent bipolar logic ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures robust operation under noisy industrial supply rails without level-shifting. |
| Propagation Delay (tpd) | 15 ns at 5 V, CL = 15 pF - Enables reliable 60 MHz clock operation in high-speed digital control loops. |
| Output Drive | 15 LSTTL loads - Supports direct connection to multiple downstream TTL inputs without buffer amplification. |
| Operating Temperature | −40°C to 125°C - Qualified for under-hood automotive, motor drive, and industrial embedded environments. |
| Input Compatibility | LSTTL and CMOS - Accepts standard 0.8 V/2.0 V logic thresholds, eliminating need for external voltage translation. |
| 3-State Enable | OE active-low, independent of clock - Allows dynamic bus arbitration without disrupting register state or timing. |
| Power Dissipation | Cpd = 47 pF - Predictable dynamic power consumption enables accurate thermal modeling in sealed enclosures. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm footprint, 1.2 mm maximum height, lead-free NIPDAU finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable (active-low) | Asserting low enables all Q outputs; high places them in high-impedance state - critical for shared bus contention management. |
| 2–9 (D0–D7) | Data inputs | Asynchronous parallel data inputs synchronized to rising CP edge - used for latch capture of sensor or interface data. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output drivers - must be low-inductance connection for noise immunity. |
| 11 (VCC) | Positive supply | 5 V nominal supply powering both logic core and output buffers - decoupling required within 10 mm of pin. |
| 12–19 (Q0–Q7) | 3-state outputs | Registered outputs driven only when OE is low - enables time-multiplexed bus sharing with other peripherals. |
| 20 (CP) | Clock input | Rising-edge sensitive; latches Dn values into Qn registers - defines precise sampling instant for deterministic control timing. |
Key Features
| Feature | Design Value |
|---|---|
| Extended temperature qualification | JEDEC-compliant HAST, temperature cycling, and intermetallic life testing ensures reliability at 125°C junction temperature. |
| Bus-line driving capability | 15 LSTTL load drive strength eliminates need for external line drivers in backplane or modular I/O designs. |
| Controlled baseline manufacturing | Single assembly/test site and single fabrication site guarantee consistent parametric performance across production lots. |
| Low power vs LSTTL | Typical ICC = 8 µA at 25°C - reduces system-level heat generation and extends battery life in portable test equipment. |
| Input transition time tolerance | Supports 0–500 ns rise/fall times at 4.5 V - accommodates slow-switching sensors or long trace routing without added Schmitt triggers. |
Applications
| Industrial PLC I/O Module | Automotive Engine Control Unit |
|---|---|
Use Scenario: Latching analog-to-digital converter outputs before serial transfer to microcontroller. IC Role / Device Role / Timing Role: Octal D-flip-flop capturing parallel ADC result bits on CP rising edge; OE controls bus release timing. Use Value: Provides deterministic, glitch-free data capture synchronized to system clock - prevents metastability in real-time control loops. |
Use Scenario: Isolating sensor data paths during ECU power-up or reset sequences. IC Role / Device Role / Timing Role: Output-enable-controlled bus isolation between crankshaft position sensor interface and main MCU data bus. Use Value: Prevents spurious signals from propagating during initialization - improves cold-start reliability and diagnostic accuracy. |
| Test Equipment Digital Pattern Generator | Avionics Data Acquisition System |
Use Scenario: Holding stimulus pattern bits for FPGA-based waveform synthesis. IC Role / Device Role / Timing Role: Parallel data register staging patterns prior to high-speed DAC loading; CP aligned to system timing reference. Use Value: Enables precise sub-cycle timing alignment between pattern generation and analog output - critical for jitter-sensitive RF calibration. |
Use Scenario: Buffering ARINC 429 receiver outputs before multiplexing into flight data recorder interface. IC Role / Device Role / Timing Role: 3-state output latching of discrete status bits; OE coordinated with time-division multiplexing controller. Use Value: Eliminates bus contention during multi-channel acquisition - ensures deterministic latency for DO-178C certifiable systems. |
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 |
|---|---|---|---|
| SN74HCT574PWR | Same logic function and pinout; commercial-grade (−40°C to 85°C), non-EP qualification. | Lacks extended temperature and enhanced DMS support; not qualified for aerospace or under-hood use. | Select for cost-sensitive consumer or lab equipment where full EP spec is unnecessary. |
| CD74ACT574M96 | ACT family: higher speed (fmax = 115 MHz), wider VCC range (4.5 V–5.5 V), but higher ICC (160 µA typ). | Higher power and faster edge rates increase EMI risk in noise-sensitive avionics or medical systems. | Choose when >60 MHz clocking is required and thermal budget allows increased dissipation. |
Compared with SN74HCT574PWR and CD74ACT574M96, the CD74HCT574QPWREP uniquely combines military-grade temperature resilience, controlled baseline manufacturing, and low-power HCT logic-making it optimal for safety-critical industrial and transportation systems where long-term supply continuity and parametric stability are mandatory.
Availability
CD74HCT574QPWREP is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and avionics applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HCT574QPWREP 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 logic solutions, with over 90 years of innovation in industrial, automotive, and aerospace electronics.
The CD74HCT574QPWREP belongs to TI's Enhanced Product (EP) logic family, engineered for high-reliability applications demanding extended temperature operation, controlled manufacturing, and long-term supply assurance.
FAQ
What is the maximum clock frequency supported by the CD74HCT574QPWREP?
The CD74HCT574QPWREP supports a maximum clock frequency of 20 MHz over its full operating temperature range (−40°C to 125°C) and 30 MHz at 25°C. This specification is validated under recommended conditions (VCC = 4.5 V, CL = 15 pF), ensuring deterministic setup/hold timing margins in real-world industrial control applications.
Does the CD74HCT574QPWREP require external pull-up resistors on its 3-state outputs?
No, the CD74HCT574QPWREP does not require external pull-up resistors on its Q0–Q7 outputs. When OE is high, outputs enter a true high-impedance state with leakage current ≤ ±10 µA (VO = VCC or GND), making them compatible with passive bus termination schemes and eliminating additional BOM components.
How does the CD74HCT574QPWREP differ from standard CD74HCT574 variants?
The CD74HCT574QPWREP differs from commercial CD74HCT574 variants through its Enhanced Product (EP) qualification: extended −40°C to 125°C operation, controlled baseline manufacturing (single fab/assembly site), JEDEC-qualified reliability testing (HAST, temperature cycling), and enhanced DMS support - all documented in TI's SCLS571 datasheet revision.
Can the CD74HCT574QPWREP interface directly with 3.3 V microcontrollers?
The CD74HCT574QPWREP is not 3.3 V tolerant on inputs or outputs. Its VCC must be 4.5–5.5 V, and VIH/VIL thresholds are defined relative to that supply (VIH ≥ 2 V, VIL ≤ 0.8 V). Direct connection to 3.3 V logic requires level-shifting circuitry to avoid undefined states or excessive input current.
What is the thermal resistance (θJA) of the CD74HCT574QPWREP in its TSSOP package?
The CD74HCT574QPWREP in the TSSOP-20 (PW) package has a specified junction-to-ambient thermal resistance (θJA) of 69°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer board layout; actual thermal performance improves with copper pour and thermal vias beneath the exposed pad region.
CD74HCT574QPWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
CD74HCT574QPWREP FAQ
1.How can I place an order for CD74HCT574QPWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT574QPWREP 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 CD74HCT574QPWREP reliable?
The price and inventory of CD74HCT574QPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT574QPWREP is usually 5 days.
3.What payment methods are accepted for CD74HCT574QPWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT574QPWREP transactions.
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4.How is shipping managed for CD74HCT574QPWREP?
CD74HCT574QPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT574QPWREP 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 CD74HCT574QPWREP?
For technical support, including CD74HCT574QPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT574QPWREP requirements.
6.How does Aetrix verify that CD74HCT574QPWREP is sourced from the original manufacturer or authorized distributors?
All CD74HCT574QPWREP 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 CD74HCT574QPWREP meets industry standards.
7.What is the process for return or replacement of CD74HCT574QPWREP?
All CD74HCT574QPWREP units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT574QPWREP, 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 CD74HCT574QPWREP part is unused and in its original packaging.
Return procedure for CD74HCT574QPWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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