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Texas Instruments CD74HCT574M96G4
- Part No.:
- CD74HCT574M96G4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT574M96G4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,139
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Product details
Overview
CD74HCT574M96G4 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-hold data latching and microcontroller peripheral interfacing.
For engineers reviewing the CD74HCT574M96G4 datasheet, CD74HCT574M96G4 pinout, CD74HCT574M96G4 application, or CD74HCT574M96G4 equivalent, key selection criteria include its HCT-level input compatibility (VIL ≤ 0.8 V, VIH ≥ 2.0 V), 20-pin SOIC package, 3-state output enable independence from register operation, and verified performance across extended temperature ranges.
Technical Context
The CD74HCT574M96G4 implements eight edge-triggered D flip-flops sharing a common clock (CP) and output enable (OE) control. Data is latched on the LOW-to-HIGH transition of CP; OE asserts high-impedance state independently of clock activity. Its HCT logic family ensures direct interface with legacy TTL systems while maintaining CMOS power efficiency.
Input buffering isolates internal circuitry from signal integrity issues, and balanced propagation/transition times minimize skew in synchronous bus applications. The device's 3-state outputs support bidirectional bus architectures without external isolation components, enabling clean signal routing in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V) with CMOS power efficiency |
| Supply Voltage | 4.5–5.5 V - matches standard 5-V system rails and avoids level-shifting in mixed-voltage designs |
| Propagation Delay | 15 ns typical (VCC = 5 V, CL = 15 pF) - enables reliable operation up to 60 MHz clock frequency in buffered bus paths |
| Output Drive | 15 LSTTL loads - sufficient for driving multiple downstream logic devices or short PCB traces without fanout buffers |
| Operating Temperature | –55°C to +125°C - qualified for industrial, automotive under-hood, and aerospace environments |
| Input Leakage | ±1 μA max (VCC = 5.5 V) - negligible current draw simplifies biasing and reduces static power in always-on subsystems |
| Quiescent Current | 160 μA max (–55°C to +125°C) - ultra-low standby power supports energy-sensitive embedded control nodes |
Pinout & Package
CD74HCT574M96G4 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 compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP) | Clock input | Positive-edge triggered - latches all eight D inputs simultaneously on rising edge; requires clean, monotonic transitions |
| 2–9 (D0–D7) | Data inputs | Asynchronous parallel inputs - drive internal D-flip-flop stages; buffered to reject noise and reduce loading |
| 10 (GND) | Ground reference | Primary return path for logic and output currents; must be low-impedance and decoupled near VCC |
| 11–18 (Q0–Q7) | 3-state outputs | Driven only when OE = LOW; high-impedance when OE = HIGH - enables shared-bus arbitration |
| 19 (OE) | Output enable | Active-LOW control - independent of clock; allows output gating without affecting stored register state |
| 20 (VCC) | Power supply | 4.5–5.5 V nominal - requires local 0.1-μF ceramic bypass capacitor to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Common 3-state output enable | Single OE pin controls all eight outputs - simplifies bus arbitration logic and reduces control signal routing |
| Direct LSTTL input compatibility | VIL ≤ 0.8 V / VIH ≥ 2.0 V - eliminates need for level shifters when interfacing with legacy 5-V TTL peripherals |
| Bus line driving capability | 15 LSTTL load rating - supports direct connection to multiple downstream gates or microcontroller I/O ports |
| Wide temperature range | –55°C to +125°C operation - validated for use in harsh environments including industrial motor controls and automotive ECUs |
| Low dynamic power dissipation | CPD = 47 pF (VCC = 5 V) - reduces switching power in high-frequency data capture applications |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status (door open/closed, seatbelt fastened) before transmission to main ECU over CAN or LIN. IC Role / Device Role / Timing Role: Octal D-flip-flop synchronizes asynchronous mechanical switch inputs to the system clock domain and presents stable data via 3-state outputs to shared diagnostic bus. Use Value: Eliminates contact bounce artifacts and provides deterministic timing alignment - critical for fault detection latency compliance per ISO 26262 ASIL-B requirements. | Use Scenario: Capturing and holding real-time analog-to-digital converter (ADC) results from engine temperature, pressure, and airflow sensors. IC Role / Device Role / Timing Role: Edge-triggered latch captures ADC output words on system clock edge; 3-state outputs allow multiplexed readout by microcontroller without bus contention. Use Value: Enables precise time-stamped sampling across multiple channels using single ADC resource - improves thermal management resolution without increasing BOM count. |
| Test Equipment Digital Pattern Generator | Legacy System Bus Interface Adapter |
Use Scenario: Generating repeatable digital stimulus waveforms for IC functional validation in ATE systems. IC Role / Device Role / Timing Role: Stores pattern data from FPGA memory and releases it synchronously onto parallel test bus lines under clock and OE control. Use Value: Provides deterministic, jitter-free waveform edges with sub-20 ns timing accuracy - essential for setup/hold margin verification of high-speed DUTs. | Use Scenario: Bridging modern microcontrollers to legacy 8-bit parallel peripherals (e.g., dot-matrix displays, EPROM programmers). IC Role / Device Role / Timing Role: Acts as bi-directional data latch between mismatched voltage domains (e.g., 3.3-V MCU and 5-V display controller), leveraging HCT input thresholds and 3-state isolation. Use Value: Avoids discrete level translators and reduces board area - accelerates retrofit integration while maintaining signal integrity on long ribbon cables. |
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, identical pinout, PDIP-20 package (25.4 mm × 6.35 mm); higher RθJA (84.6°C/W) vs. SOIC (109.1°C/W) | Preferred for prototyping or through-hole assembly; less suitable for thermally constrained high-density boards | Select when manual soldering, breadboarding, or legacy board rework is required |
| CD74HCT574PWR | Same electrical specs, TSSOP-20 package (6.5 mm × 4.4 mm); smaller footprint and lower profile than SOIC | Better suited for space-constrained portable or automotive modules where height clearance is limited | Choose for miniaturized designs requiring 40% smaller PCB area and improved thermal performance (RθJA = 131.8°C/W) |
Compared with SN74HCT574N and CD74HCT574PWR, CD74HCT574M96G4 offers optimal balance of thermal robustness (SOIC RθJA = 109.1°C/W), surface-mount reliability, and broad industry availability - making it the default choice for production-grade industrial controllers and automotive body electronics.
Availability
CD74HCT574M96G4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HCT574M96G4 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The CD74HCT574M96G4 belongs to TI's legacy HC/HCT logic portfolio, designed specifically for robust, pin-compatible replacement of obsolete TTL latches in high-reliability systems where timing predictability and wide-temperature operation are mandatory.
FAQ
What is the maximum clock frequency supported by the CD74HCT574M96G4?
The CD74HCT574M96G4 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. This specification is derived from measured tW (clock pulse width) and tSU/tH (setup/hold) timing margins in TI's official SCHS183E datasheet.
Does the CD74HCT574M96G4 require external pull-up resistors on its outputs?
No, the CD74HCT574M96G4 does not require external pull-up resistors on its Q0–Q7 outputs because they are actively driven push-pull outputs in the LOW or HIGH state, and enter true high-impedance (Hi-Z) when OE is HIGH. Pull-ups would interfere with defined logic levels and increase static power - TI's datasheet specifies no such requirement and confirms CMOS-compatible output structure.
How does the CD74HCT574M96G4 differ from the CD74HC574M96 in practical design?
The CD74HCT574M96G4 uses HCT logic with TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V), while CD74HC574M96 uses HC logic (VIL ≤ 1.35 V, VIH ≥ 3.15 V at VCC = 4.5 V). This makes CD74HCT574M96G4 directly interoperable with legacy 5-V TTL outputs without level shifting, whereas CD74HC574M96 requires stricter input voltage compliance - a critical distinction in mixed-technology systems.
Can the CD74HCT574M96G4 be used with a 3.3-V microcontroller interface?
The CD74HCT574M96G4 is not recommended for direct 3.3-V microcontroller interface because its VIH minimum is 2.0 V (TTL-compatible), but its VCC must be 4.5–5.5 V - meaning it cannot operate at 3.3 V. Driving its inputs from a 3.3-V MCU may violate VIH margin; level translation or use of 3.3-V–tolerant variants (e.g., SN74LVC574A) is required for safe interoperability.
What is the purpose of the separate OE (output enable) pin on the CD74HCT574M96G4?
The OE pin on the CD74HCT574M96G4 provides independent control of the 3-state outputs - allowing Q0–Q7 to enter high-impedance mode regardless of clock or stored data state. This enables safe sharing of data buses among multiple devices, prevents bus contention during read/write cycles, and supports hot-swap or dynamic reconfiguration without disrupting internal register contents.
CD74HCT574M96G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
CD74HCT574M96G4 FAQ
1.How can I place an order for CD74HCT574M96G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT574M96G4 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 CD74HCT574M96G4 reliable?
The price and inventory of CD74HCT574M96G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT574M96G4 is usually 5 days.
3.What payment methods are accepted for CD74HCT574M96G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT574M96G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT574M96G4?
CD74HCT574M96G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT574M96G4 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 CD74HCT574M96G4?
For technical support, including CD74HCT574M96G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT574M96G4 requirements.
6.How does Aetrix verify that CD74HCT574M96G4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT574M96G4 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 CD74HCT574M96G4 meets industry standards.
7.What is the process for return or replacement of CD74HCT574M96G4?
All CD74HCT574M96G4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT574M96G4, 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 CD74HCT574M96G4 part is unused and in its original packaging.
Return procedure for CD74HCT574M96G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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