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Texas Instruments CD74HCT574QPWRQ1
- Part No.:
- CD74HCT574QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD74HCT574QPWRQ1.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
CD74HCT574QPWRQ1 from Texas Instruments is an automotive-qualified octal D-type flip-flop with 3-state outputs, 5 V supply operation (4.5–5.5 V), 15 ns typical propagation delay at 5 V/15 pF, and bus-line driving capability for up to 15 LSTTL loads. It functions as a synchronous data latch in digital control buses, automotive body control modules, and industrial I/O expansion systems.
For engineers reviewing the CD74HCT574QPWRQ1 datasheet, CD74HCT574QPWRQ1 pinout, CD74HCT574QPWRQ1 application, or CD74HCT574QPWRQ1 equivalent, key selection criteria include its −40°C to 125°C automotive temperature range, edge-triggered clock input, independent 3-state output enable, and TTL/CMOS input compatibility with VIH ≥ 2 V and VIL ≤ 0.8 V.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock transition, with asynchronous 3-state output control via a dedicated OE pin. Each flip-flop features buffered inputs and rail-to-rail CMOS-compatible output swing under 5 V supply.
It supports bus-oriented architectures through high-impedance outputs when OE is high, enabling multi-drop data bus sharing without contention. Propagation delay matching (tpd = 15 ns typ) and balanced transition times ensure deterministic timing in synchronous control paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across automotive battery voltage fluctuations. |
| Propagation Delay (tpd) | 15 ns at VCC = 5 V, CL = 15 pF - Enables reliable 60 MHz maximum clock operation in timing-critical control logic. |
| Input Voltage Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V - Guarantees direct interface with legacy LSTTL logic without level shifting. |
| Output Drive Strength | ±25 mA per output - Supports driving 15 LSTTL loads or moderate PCB trace capacitance. |
| Operating Temperature | −40°C to +125°C - Qualified for under-hood and powertrain control applications per AEC-Q100. |
| 3-State Enable Delay (ten) | 12 ns at VCC = 5 V, CL = 15 pF - Allows fast bus arbitration and rapid output release during multiplexed data transfers. |
| Power Dissipation Capacitance | Cpd = 47 pF - Enables accurate dynamic power estimation in high-frequency digital subsystems. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm footprint, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low control: drives all Q outputs to high-impedance when high; independent of clock/register state. |
| 2–9 (D0–D7) | Data Inputs | Asynchronous parallel data inputs synchronized to rising CP edge; buffered for noise immunity. |
| 10 (GND) | Ground Reference | Primary return path for logic and output current; must be low-impedance for signal integrity. |
| 11 (VCC) | Supply Voltage | 5 V nominal power rail; decoupling required within 1 cm for transient suppression. |
| 12–19 (Q0–Q7) | 3-State Outputs | Registered outputs enabled only when OE is low; high-impedance otherwise for bus sharing. |
| 20 (CP) | Clock Input | Rising-edge sensitive; latches Dn values into Qn on low-to-high transition; Schmitt-triggered for slow-edge tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | AEC-Q100 Grade 1 qualified (−40°C to +125°C), supporting safety-critical vehicle subsystems. |
| Bus-Line Driving | 15 LSTTL load drive capability enables direct connection to legacy bus structures without buffers. |
| Input Compatibility | Direct LSTTL and CMOS logic level compatibility eliminates need for external level translators. |
| Low Power Consumption | ICC = 8 µA typical at 25°C - reduces quiescent power in always-on automotive modules. |
| Control Independence | OE function operates independently of clock and register state, allowing real-time bus isolation. |
Applications
| Automotive Body Control Unit | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Latching sensor status (door open/closed, seatbelt fastened) and actuator commands (window lift, mirror fold) in centralized BCM microcontroller interfaces. IC Role / Device Role / Timing Role: Synchronous data register providing glitch-free, edge-aligned capture of parallel status signals before MCU readback. Use Value: Enables deterministic sampling of noisy automotive switch inputs while maintaining bus isolation during MCU interrupt servicing. | Use Scenario: Extending discrete I/O count of programmable logic controllers via parallel backplane interfaces to remote I/O modules. IC Role / Device Role / Timing Role: Octal latch buffering field-side digital inputs and synchronizing them to the PLC's internal clock domain. Use Value: Provides robust 15-LSTTL-load drive strength and 3-state control to prevent bus contention across multiple I/O cards. |
| Automotive Instrument Cluster | Automotive HVAC Control Module |
Use Scenario: Capturing button press states and LED driver enable signals in digital dashboards with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Edge-triggered register holding user input data until polled by cluster MCU, with OE used for display update synchronization. Use Value: Delivers 15 ns propagation delay and −40°C to +125°C operation for responsive, fail-safe human-machine interface timing. | Use Scenario: Managing blower motor speed select lines, mode actuator positions, and temperature sensor digitization enable signals in climate control ECUs. IC Role / Device Role / Timing Role: Parallel data latch isolating MCU GPIOs from high-noise HVAC power stages using 3-state outputs. Use Value: Prevents back-driving and ground bounce during simultaneous actuator switching via independent OE-controlled bus release. |
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 |
|---|---|---|---|
| SN74HCT574QPWRQ1 | Identical electrical specs and pinout; TI part number variant with same TSSOP-20 packaging and automotive qualification. | No functional difference; identical use cases and qualification scope. | Select based on distributor stock availability and traceability requirements. |
| MC74HCT574ADTR2G | Onsemi variant: same logic function, 3-state outputs, and 5 V operation but rated −55°C to +125°C; different thermal resistance (θJA = 75°C/W). | Broadened cold-temperature support suits extreme-environment military or off-road vehicles where −55°C startup is required. | Prefer MC74HCT574ADTR2G only if extended low-temp operation is mandatory and layout allows for higher thermal impedance. |
Compared with CD74HCT574QPWRQ1, SN74HCT574QPWRQ1 offers identical performance and drop-in compatibility, while MC74HCT574ADTR2G trades minor thermal derating for extended low-temperature capability-making it suitable only when −55°C operation is explicitly required.
Availability
CD74HCT574QPWRQ1 is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC I/O expansion, and HVAC control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT574QPWRQ1 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 innovation in high-reliability IC design.
The CD74HCT574QPWRQ1 belongs to TI's HCT logic family, engineered specifically for automotive and industrial applications demanding robust noise immunity, wide temperature operation, and seamless TTL/CMOS interoperability.
FAQ
What is the maximum clock frequency supported by the CD74HCT574QPWRQ1?
The CD74HCT574QPWRQ1 supports a maximum clock frequency of 30 MHz at TA = 25°C and 20 MHz across its full −40°C to +125°C operating range, as specified in the timing requirements table. This limit ensures setup/hold time compliance and stable register operation under worst-case voltage and temperature conditions. The CD74HCT574QPWRQ1 achieves this using optimized internal gate delays and balanced rise/fall times.
Does the CD74HCT574QPWRQ1 require external pull-up resistors on its outputs?
No, the CD74HCT574QPWRQ1 does not require external pull-up resistors on its Q0–Q7 outputs because it features active push-pull (totem-pole) outputs in the enabled state and true high-impedance (Hi-Z) 3-state behavior when OE is high. Pull-ups would interfere with bus-driving capability and violate the specified VOH/VOL levels. The CD74HCT574QPWRQ1 is designed for direct connection to LSTTL loads or shared data buses.
How does the CD74HCT574QPWRQ1 handle floating inputs, and what is the recommended practice?
All unused inputs of the CD74HCT574QPWRQ1-including D0–D7, CP, and OE-must be tied to either VCC or GND to prevent undefined logic states, increased ICC, or oscillation. TI's application report SCBA004 explicitly mandates this for CMOS-based HCT devices. Leaving inputs floating violates the CD74HCT574QPWRQ1's recommended operating conditions and may cause erratic behavior in automotive environments with EMI exposure.
Is the CD74HCT574QPWRQ1 pin-compatible with standard 74HCT574 variants from other manufacturers?
Yes, the CD74HCT574QPWRQ1 uses the industry-standard TSSOP-20 pinout defined in JEDEC MO-153 and matches the pin assignments of non-automotive 74HCT574 devices (e.g., CD74HCT574M96). Its pin mapping-OE, D0–D7, GND, VCC, Q0–Q7, CP-is identical across qualified and catalog versions, enabling mechanical and electrical compatibility in existing layouts where automotive qualification is added later.
What is the significance of the "Q1" suffix in CD74HCT574QPWRQ1?
The "Q1" suffix in CD74HCT574QPWRQ1 denotes Texas Instruments' automotive qualification per AEC-Q100 Grade 1 standards, including enhanced reliability testing, extended temperature operation (−40°C to +125°C), and controlled manufacturing flow. This distinguishes it from commercial-grade variants like CD74HCT574PWR and confirms that the CD74HCT574QPWRQ1 meets automotive quality and longevity requirements for production vehicle applications.
CD74HCT574QPWRQ1 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:
- Obsolete
- 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
CD74HCT574QPWRQ1 FAQ
1.How can I place an order for CD74HCT574QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT574QPWRQ1 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 CD74HCT574QPWRQ1 reliable?
The price and inventory of CD74HCT574QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT574QPWRQ1 is usually 5 days.
3.What payment methods are accepted for CD74HCT574QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT574QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT574QPWRQ1?
CD74HCT574QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT574QPWRQ1 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 CD74HCT574QPWRQ1?
For technical support, including CD74HCT574QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT574QPWRQ1 requirements.
6.How does Aetrix verify that CD74HCT574QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All CD74HCT574QPWRQ1 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 CD74HCT574QPWRQ1 meets industry standards.
7.What is the process for return or replacement of CD74HCT574QPWRQ1?
All CD74HCT574QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT574QPWRQ1, 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 CD74HCT574QPWRQ1 part is unused and in its original packaging.
Return procedure for CD74HCT574QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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