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Texas Instruments CD74HCT574QPWRG4Q1
- Part No.:
- CD74HCT574QPWRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD74HCT574QPWRG4Q1.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,951
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Product details
Overview
CD74HCT574QPWRG4Q1 from Texas Instruments is an automotive-qualified octal D-type flip-flop with 3-state outputs, 20-pin TSSOP package, VCC = 4.5–5.5 V operation, tpd = 15 ns (5 V, 15 pF), and bus-line driving capability for up to 15 LSTTL loads. It functions as a data latch and bus interface in automotive control modules requiring synchronized parallel data capture and isolated bus access.
For engineers reviewing the CD74HCT574QPWRG4Q1 datasheet, CD74HCT574QPWRG4Q1 pinout, CD74HCT574QPWRG4Q1 application, or CD74HCT574QPWRG4Q1 equivalent, this device supports edge-triggered register storage, independent 3-state output enable control, and direct LSTTL/CMOS logic compatibility - critical for automotive body control units, instrument cluster interfaces, and ECU data buffering.
Technical Context
The CD74HCT574QPWRG4Q1 implements eight independent positive-edge-triggered D flip-flops sharing a common clock (CP) and a single active-low 3-state output enable (OE). Its register operation is fully decoupled from output control: data latching occurs on CP's rising edge regardless of OE state, while OE independently places Q0–Q7 into high-impedance when asserted high.
Designed for automotive environments, it operates across −40°C to +125°C, features buffered inputs with VIH = 2 V (min) and VIL = 0.8 V (max), and delivers balanced propagation delay (tPLH/tPHL) and transition times to minimize skew in synchronous bus systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation under automotive battery voltage fluctuations including cold-crank conditions. |
| tpd (CP to Q) | 15 ns at VCC = 5 V, CL = 15 pF - Enables reliable 60 MHz maximum clock operation in timing-critical control loops. |
| Output Drive | 15 LSTTL loads - Supports direct interfacing to legacy TTL-based subsystems without external buffers. |
| Input Compatibility | LSTTL and CMOS - Accepts standard 0.8 V/2.0 V logic thresholds and draws ≤1 µA input current at VCC = 5.5 V. |
| Operating Temp | −40°C to +125°C - Qualified per AEC-Q100 for under-hood and cabin-mounted automotive electronics. |
| 3-State Enable | Active-high OE with independent control - Allows dynamic bus arbitration and multi-master system partitioning. |
| Power Dissipation | Cpd = 47 pF - Enables accurate dynamic power estimation (PD = CpdVCC²fI + ΣCLVCC²fO) for thermal design. |
Pinout & Package
TSSOP-20 (PW) package, 6.5 mm × 4.4 mm footprint, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-high 3-state output enable - Drives all eight outputs (Q0–Q7) into high-impedance when high; no effect on internal register state. |
| 2–9 | D0–D7 | Data inputs - Sampled on rising edge of CP; internally latched and held until next clock edge. |
| 10 | GND | Ground reference - Must be connected to system ground plane for noise immunity and correct logic threshold referencing. |
| 11 | VCC | Positive supply - Requires local 100 nF ceramic bypass capacitor placed within 3 mm of pin for stable switching performance. |
| 12–19 | Q0–Q7 | 3-state outputs - Reflect latched D-input values when OE is low; high-Z when OE is high - enables shared bus topology. |
| 20 | CP | Clock input - Rising-edge sensitive; must meet tsu = 12 ns (min) setup and th = 5 ns (min) hold relative to D inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C) - Validated for use in safety-critical vehicle subsystems including lighting control and HVAC. |
| Bus-line driving capability | 15 LSTTL load drive - Eliminates need for external line drivers in legacy automotive instrumentation interfaces. |
| Independent 3-state control | OE pin operates asynchronously and independently of CP - Enables real-time bus release without disrupting register contents. |
| Low power vs LSTTL | Significant static and dynamic power reduction - Reduces thermal load in densely packed ECUs compared to equivalent 74LS574 implementations. |
| Input transition time tolerance | tt ≤ 500 ns (VCC = 4.5 V) - Accommodates slower signal edges common in long-wire harnesses without metastability risk. |
Applications
| Body Control Module (BCM) | Instrument Cluster Interface |
|---|---|
|
Use Scenario: Capturing switch status (door open, seatbelt, trunk latch) and driving segmented LED displays via shared CAN/LIN gateway microcontroller. IC Role / Device Role / Timing Role: Parallel data latch synchronizing asynchronous mechanical inputs to MCU clock domain; 3-state outputs isolate display bus during MCU reconfiguration. Use Value: Prevents bus contention during firmware updates and enables deterministic sampling of noisy switch signals using controlled clock edges. |
Use Scenario: Buffering SPI-serialized gauge pointer positions and warning lamp states to multiplexed LED driver ICs in digital dashboards. IC Role / Device Role / Timing Role: Data staging register holding updated display values until frame sync pulse triggers simultaneous output enable. Use Value: Eliminates visual flicker by ensuring atomic update of all 8 gauge segments with zero bus glitch during transitions. |
| Engine Control Unit (ECU) Diagnostics Port | ADAS Camera Power Sequencing |
|
Use Scenario: Isolating diagnostic test equipment from main ECU bus during OBD-II compliance testing using external J2534 interface. IC Role / Device Role / Timing Role: Bidirectional bus isolator - D inputs receive ECU response data, Q outputs drive tester-side logic level translators. Use Value: Enables hot-plug-safe diagnostics without risking ECU reset or communication lockup due to tester-induced bus conflicts. |
Use Scenario: Sequencing power-on/off timing for multiple camera modules (front, rear, surround-view) using MCU GPIO-controlled enable signals. IC Role / Device Role / Timing Role: Synchronized power-enable register - eight Q outputs drive discrete MOSFET gate drivers with precise inter-module delay control. Use Value: Prevents inrush current stacking and ensures camera sensor initialization order matches image processing pipeline readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT574QPWRG4Q1 | Identical electrical specs and pinout; TI part number variant with same PW package and automotive qualification. | No functional difference - used interchangeably in BOMs where alternate TI branding is accepted. | Select when sourcing flexibility across TI's dual-part-number ecosystem is required without redesign. |
| MC74VHC574DTG | Higher VCC range (2–5.5 V), lower tpd (9.5 ns), but only industrial temp (−40°C to +85°C); not AEC-Q100 qualified. | Not suitable for under-hood or safety-critical locations; limited to cabin-only infotainment or telematics modules. | Choose only for cost-sensitive non-automotive applications or secondary systems where extended temperature range is unnecessary. |
Compared with SN74HCT574QPWRG4Q1, CD74HCT574QPWRG4Q1 offers identical functionality and qualification; versus MC74VHC574DTG, it trades speed for guaranteed automotive-grade reliability and thermal robustness - essential for primary vehicle control functions.
Availability
CD74HCT574QPWRG4Q1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, and engine control unit diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT574QPWRG4Q1 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 automotive-grade logic solutions with over 50 years of automotive component validation experience.
The CD74HCT574QPWRG4Q1 belongs to TI's HCT logic family - designed specifically for drop-in replacement of legacy 74LS devices in automotive and industrial systems requiring TTL-compatible inputs and improved power efficiency.
FAQ
What is the maximum clock frequency supported by CD74HCT574QPWRG4Q1?
The CD74HCT574QPWRG4Q1 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 ambient. This is determined by the minimum clock pulse width (tw = 16 ns min at 4.5 V) and setup/hold timing requirements, making it suitable for mid-speed automotive serial bus interfacing and control sequencing tasks.
Does CD74HCT574QPWRG4Q1 require external pull-up or pull-down resistors on unused inputs?
Yes, CD74HCT574QPWRG4Q1 requires all unused inputs (D0–D7, CP, OE) to be tied to either VCC or GND to prevent floating nodes that could cause excessive ICC current, logic instability, or increased EMI. TI's application report SCBA004 explicitly mandates this for proper operation and reliability in automotive environments.
Can CD74HCT574QPWRG4Q1 drive a 50-pF load with guaranteed timing performance?
Yes, CD74HCT574QPWRG4Q1 specifies tpd = 33–50 ns and tdis/ten = 28–45 ns with CL = 50 pF at VCC = 4.5 V, confirming full timing compliance for heavier capacitive loads typical in backplane or long-trace automotive wiring harnesses.
Is CD74HCT574QPWRG4Q1 pin-compatible with standard 74HCT574 variants?
Yes, CD74HCT574QPWRG4Q1 uses the industry-standard 20-pin TSSOP (PW) footprint and identical pinout to non-automotive 74HCT574 devices in the same package, including TI's catalog CD74HCT574PWR. No PCB layout changes are needed when upgrading to the Q1-qualified version.
What is the absolute maximum supply voltage rating for CD74HCT574QPWRG4Q1?
The absolute maximum supply voltage for CD74HCT574QPWRG4Q1 is 7 V, as specified in the Absolute Maximum Ratings table. Operation above 5.5 V - even briefly - risks permanent damage and violates the recommended operating conditions; automotive power supply filtering must ensure VCC stays within 4.5–5.5 V during transients.
CD74HCT574QPWRG4Q1 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
CD74HCT574QPWRG4Q1 FAQ
1.How can I place an order for CD74HCT574QPWRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT574QPWRG4Q1 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 CD74HCT574QPWRG4Q1 reliable?
The price and inventory of CD74HCT574QPWRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT574QPWRG4Q1 is usually 5 days.
3.What payment methods are accepted for CD74HCT574QPWRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT574QPWRG4Q1 transactions.
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4.How is shipping managed for CD74HCT574QPWRG4Q1?
CD74HCT574QPWRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT574QPWRG4Q1 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 CD74HCT574QPWRG4Q1?
For technical support, including CD74HCT574QPWRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT574QPWRG4Q1 requirements.
6.How does Aetrix verify that CD74HCT574QPWRG4Q1 is sourced from the original manufacturer or authorized distributors?
All CD74HCT574QPWRG4Q1 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 CD74HCT574QPWRG4Q1 meets industry standards.
7.What is the process for return or replacement of CD74HCT574QPWRG4Q1?
All CD74HCT574QPWRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT574QPWRG4Q1, 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 CD74HCT574QPWRG4Q1 part is unused and in its original packaging.
Return procedure for CD74HCT574QPWRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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