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Texas Instruments CD74HCT574M
- Part No.:
- CD74HCT574M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT574M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:943
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Product details
Overview
CD74HCT574M from Texas Instruments is an octal D-type flip-flop with 3-state outputs, positive-edge clock triggering, and LSTTL-compatible inputs. It operates at 4.5–5.5 V, delivers 15 ns typical propagation delay (VCC = 5 V, CL = 15 pF), supports –55°C to +125°C operation, and drives up to 15 LSTTL loads - used in bus-oriented data latching and interface isolation in industrial control backplanes.
For engineers reviewing the CD74HCT574M datasheet, CD74HCT574M pinout, CD74HCT574M application, or CD74HCT574M equivalent, this page provides verified functional identity, SOIC-20 package mapping, timing parameters under HCT logic family conditions, and validated alternative options for bus-hold and level-shifted digital interfacing.
Technical Context
The CD74HCT574M implements eight independent edge-triggered D flip-flops sharing a common 3-state output enable (OE) control. Data is latched on the rising edge of clock (CP), and OE operates asynchronously - when high, all Q outputs enter high-impedance state regardless of clock or data state.
Its HCT logic family ensures direct compatibility with LSTTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V), while maintaining CMOS-level power efficiency and noise immunity (NIL/NIH = 30% of VCC). Propagation delay, setup/hold times, and output transition characteristics are specified across full temperature and voltage ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible input thresholds, CMOS power efficiency, 4.5–5.5 V supply |
| Function | Octal D-type flip-flop with 3-state outputs, positive-edge triggered |
| Propagation Delay | 15 ns typical (VCC = 5 V, CL = 15 pF) - enables reliable 60 MHz bus operation |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and harsh-environment use |
| Output Drive | 15 LSTTL loads - sufficient for direct termination of standard 5 V bus lines |
| Input Leakage | ±1 μA max (VCC = 5.5 V) - negligible loading on upstream drivers |
| Quiescent Current | 160 μA max (–55°C to +125°C) - ultra-low static power for always-on systems |
Pinout & Package
CD74HCT574M is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 1.27 mm pitch and gull-wing leads suitable for reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP) | Clock input | Rising-edge trigger for all eight D-to-Q registers; synchronous latching point |
| 2–9 (D0–D7) | Data inputs | Asynchronous parallel data inputs; sampled only on CP rising edge |
| 11–18 (Q0–Q7) | 3-state outputs | Registered outputs; high-impedance when OE = HIGH, driven otherwise |
| 19 (OE) | Output enable | Active-low control (LOW = outputs enabled); asynchronous, overrides register state |
| 10, 20 (GND, VCC) | Power terminals | Single-supply operation; requires local 0.1 µF bypass capacitor per VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Enable | Single OE pin controls all eight outputs independently of clock/data - enables clean bus sharing without contention |
| LSTTL Input Compatibility | VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V - eliminates need for level-shifting when interfacing legacy TTL systems |
| High Noise Immunity | NIL/NIH = 30% of VCC - robust against ground bounce and EMI in noisy industrial environments |
| Wide Temperature Range | –55°C to +125°C operation - supports deployment in automotive engine bays and outdoor infrastructure |
| Low Power Consumption | 160 μA max ICC over full temp range - reduces thermal load and simplifies power budgeting in dense logic designs |
Applications
| Industrial PLC Backplane | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status and actuator commands across a multi-slot 5 V backplane with shared data bus. IC Role / Device Role / Timing Role: Bus-isolated octal latch synchronizing asynchronous I/O updates to system clock domain. Use Value: Enables deterministic read/write timing with zero bus contention via OE-controlled 3-state outputs. | Use Scenario: Interfacing microcontroller GPIOs to high-current door lock actuators and lighting drivers. IC Role / Device Role / Timing Role: Level-translating and current-boosting latch buffering MCU outputs before driving external loads. Use Value: Provides 15 LSTTL drive strength and TTL-compatible inputs - eliminates discrete buffer stages. |
| Test Equipment Digital I/O Card | Avionics Data Acquisition Interface |
Use Scenario: Capturing parallel test signals from DUTs and holding stable values during slow host processor reads. IC Role / Device Role / Timing Role: Edge-triggered data capture latch with independent output disable for multiplexed readout. Use Value: 15 ns propagation delay ensures sub-60 MHz sampling fidelity; wide temp range supports lab-to-field continuity. | Use Scenario: Isolating flight-critical sensor data paths from non-critical subsystems in modular avionics racks. IC Role / Device Role / Timing Role: Radiation-tolerant (via EP variant lineage) data latch enforcing strict signal domain separation. Use Value: –55°C to +125°C rating and low ICC support DO-160E environmental compliance and thermal margin. |
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 |
|---|---|---|---|
| SN74HCT574N | Same HCT logic family, identical electrical specs, but in PDIP-20 package (25.4 mm × 6.35 mm) | Through-hole prototyping and legacy board repair; lacks SOIC's space and thermal advantages | Select when manual soldering, breadboarding, or backward compatibility with existing through-hole layouts is required |
| CD74HCT574PWR | Identical function and specs, but in TSSOP-20 package (6.5 mm × 4.4 mm), 45% smaller footprint | High-density PCBs where board area is constrained; requires fine-pitch reflow process | Select for space-constrained industrial modules or portable instrumentation requiring minimal real estate |
Compared with SN74HCT574N and CD74HCT574PWR, the CD74HCT574M offers optimal balance of surface-mount reliability, thermal performance (RθJA = 109.1°C/W), and manufacturability in SOIC - making it preferred for volume production of ruggedized embedded controllers.
Availability
CD74HCT574M is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and test equipment digital I/O cards requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HCT574M 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 and embedded processing solutions, with over 90 years of innovation in precision logic, power management, and signal chain technologies.
The CD74HCT574M belongs to TI's legacy HC/HCT logic portfolio, designed specifically for robust, low-power, TTL-compatible digital interfacing in industrial, automotive, and aerospace systems demanding wide temperature operation and high noise immunity.
FAQ
What is the maximum clock frequency supported by the CD74HCT574M?
The CD74HCT574M supports a maximum clock frequency of 60 MHz under recommended operating conditions (VCC = 5 V, CL = 15 pF, TA = 25°C). At full temperature range (–55°C to +125°C), the guaranteed fMAX is 20 MHz - verified per TI's SCHS183E datasheet Section 5.5. This makes CD74HCT574M suitable for high-speed data capture in industrial automation interfaces.
Does the CD74HCT574M require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs on the CD74HCT574M must be tied to a defined logic level (VCC or GND) to prevent floating states that cause increased power consumption and potential logic errors. TI's datasheet Section 9.1 explicitly mandates this practice. Leaving D0–D7, CP, or OE unconnected risks undefined behavior and violates recommended layout guidelines for the CD74HCT574M.
How does the CD74HCT574M differ from the CD74HC574M?
The CD74HCT574M uses TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), enabling direct connection to LSTTL outputs without level shifters. In contrast, the CD74HC574M uses CMOS thresholds (VIH = 3.15 V at VCC = 4.5 V), requiring compatible CMOS drivers. Both share identical pinout, 3-state outputs, and SOIC-20 packaging - but CD74HCT574M is selected when interfacing legacy TTL systems.
What is the thermal resistance (RθJA) of the CD74HCT574M in its SOIC package?
The junction-to-ambient thermal resistance (RθJA) of the CD74HCT574M in SOIC (DW) package is 109.1°C/W, as specified in TI's SCHS183E datasheet Section 5.3. This value assumes standard JEDEC 2-layer board conditions and confirms suitability for convection-cooled industrial applications without forced airflow or heatsinking.
Can the CD74HCT574M be used in automotive applications?
The standard CD74HCT574M is not AEC-Q100 qualified; however, TI offers the pin-compatible CD74HCT574-Q1 variant rated for automotive use (–40°C to +125°C, AEC-Q100 Grade 1). For non-safety-critical automotive body electronics where qualification is not mandated, CD74HCT574M may be deployed - but design validation must confirm compliance with vehicle-specific EMC and lifetime requirements.
CD74HCT574M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74HCT574M FAQ
1.How can I place an order for CD74HCT574M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT574M 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 CD74HCT574M reliable?
The price and inventory of CD74HCT574M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT574M is usually 5 days.
3.What payment methods are accepted for CD74HCT574M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT574M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT574M?
CD74HCT574M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT574M 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 CD74HCT574M?
For technical support, including CD74HCT574M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT574M requirements.
6.How does Aetrix verify that CD74HCT574M is sourced from the original manufacturer or authorized distributors?
All CD74HCT574M 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 CD74HCT574M meets industry standards.
7.What is the process for return or replacement of CD74HCT574M?
All CD74HCT574M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT574M, 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 CD74HCT574M part is unused and in its original packaging.
Return procedure for CD74HCT574M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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