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STMicroelectronics M74HC574TTR
- Part No.:
- M74HC574TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M74HC574TTR.pdf
- Description:
- IC FLIP FLOP OCTAL D 3ST 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,634
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Product details
Overview
M74HC574TTR from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with 3-state non-inverting outputs, designed for data latching and bus interface in digital systems. It operates from 2V to 6V, delivers 90MHz max clock frequency (typ. at VCC = 6V), features symmetrical 6mA output drive, and supports industrial temperature range (−55°C to +125°C) in TSSOP-20 package.
For engineers reviewing the M74HC574TTR datasheet, M74HC574TTR pinout, M74HC574TTR application, or M74HC574TTR equivalent, key selection criteria include 3-state bus hold capability, low 4µA quiescent current, balanced tPLH/tPHL propagation delays, and compatibility with legacy 74-series logic timing and footprint.
Technical Context
The M74HC574TTR implements edge-triggered storage using a positive-going clock (CK) to capture parallel D0–D7 inputs and present them on Q0–Q7 outputs. Its 3-state control is managed independently via active-low OE, enabling bidirectional bus sharing without affecting internal register state.
Designed in sub-micron C2MOS technology, it achieves high noise immunity (VIH/VIL = 28% VCC min), wide voltage tolerance (2–6V), and robust ESD protection on all inputs-making it suitable for mixed-voltage interfacing and noise-prone industrial control backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports direct interfacing with 3.3V and 5V logic domains without level shifters |
| fMAX | 90MHz (typ. at VCC = 6V) - enables high-throughput data capture in fast control loops and address latching |
| IOH/IOL | ±6mA (min) - drives standard TTL loads and multiple CMOS inputs while maintaining rail-to-rail swing |
| tPLH / tPHL | 15ns / 15ns (typ. at VCC = 6V, CL = 50pF) - ensures deterministic setup/hold timing in synchronous bus architectures |
| ICC (Quiescent) | 4µA (max at TA = 25°C) - minimizes standby power in battery-backed or energy-sensitive embedded controllers |
| Operating Temp | −55°C to +125°C - qualified for under-hood automotive, industrial PLC, and aerospace avionics environments |
| Input Hysteresis | VNIH = VNIL = 28% VCC (min) - rejects high-frequency noise on clock and control lines without external filtering |
Pinout & Package
TSSOP-20 package: 6.5mm × 4.4mm body, 0.65mm pitch, thin-profile surface-mount construction with exposed pad option (not thermally enhanced per datasheet); RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state enable | Asserting low enables Q0–Q7 outputs; high places all outputs in high-impedance mode - critical for shared data bus arbitration |
| 2–9 (D0–D7) | Asynchronous data inputs | Accept parallel input data independent of OE state; sampled on rising CK edge - supports pipeline staging |
| 11 (CK) | Positive-edge clock | Edge-triggered latch control; minimum pulse width 6ns (at VCC = 6V) - compatible with FPGA I/O and microcontroller GPIO timing |
| 12–19 (Q7–Q0) | Non-inverting 3-state outputs | Output latched data when OE = L; tri-stated when OE = H - eliminates bus contention during read/write direction switching |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance PCB connection to minimize ground bounce |
| 20 (VCC) | Positive supply | Single-supply rail powering logic core and output drivers; decoupling capacitor (100nF) required within 5mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible with 74LS574 | Direct drop-in replacement for legacy TTL-based latches without redesigning PCB layout or timing margins |
| 3-state output control | OE pin operates independently of clock and latch state - allows dynamic bus release without disrupting internal register contents |
| High noise immunity | 28% VCC input hysteresis ensures reliable operation in electrically noisy motor drive or relay-switching environments |
| Low-power CMOS design | 4µA max ICC at 25°C enables use in always-on monitoring circuits without thermal derating concerns |
| Wide temperature qualification | −55°C to +125°C operation verified per AEC-Q100 stress test conditions - suitable for under-dash automotive modules |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status bits (door open/closed, seatbelt fastened) before transmission over CAN or LIN bus. IC Role / Device Role / Timing Role: Parallel data register synchronizing asynchronous mechanical switch inputs to microcontroller's synchronous peripheral interface. Use Value: Eliminates contact bounce artifacts via synchronized sampling and provides bus-isolated output staging during CAN frame assembly. | Use Scenario: Buffering headlight, wiper, and HVAC control signals between MCU and high-side driver ICs. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between 3.3V MCU GPIO and 5V-compatible power switches. Use Value: Enables single-supply 5V operation while accepting 3.3V logic levels, reducing need for discrete level translators. |
| Test Equipment Digital Pattern Generator | Legacy System Bus Interface Adapter |
Use Scenario: Generating precise, glitch-free stimulus waveforms for IC functional testing across multiple voltage domains. IC Role / Device Role / Timing Role: High-speed data latch holding pattern words prior to parallel-to-serial conversion and output driver stage. Use Value: 90MHz fMAX and 15ns propagation delay ensure sub-10ns timing resolution in automated test equipment waveform engines. | Use Scenario: Interfacing modern ARM-based controller boards with legacy ISA or VMEbus peripherals requiring 74-series timing compliance. IC Role / Device Role / Timing Role: Bus transceiver and address/data latch bridging mismatched clock domains and voltage rails. Use Value: Pin-for-pin compatibility with 74LS574 and 2–6V operation simplifies retrofitting without modifying existing schematics or firmware timing. |
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 |
|---|---|---|---|
| SN74HC574PWR | Same logic function and pinout; TI version rated for −40°C to +85°C only; CPD = 52pF vs 54pF | Limited to commercial/industrial ambient; lacks extended temp qualification for under-hood or outdoor enclosures | Select when cost sensitivity outweighs extended temperature requirement and supply chain favors TI distribution |
| 74VHC574FT | Lower ICC (2µA typ.), faster tPLH/tPHL (11ns typ. at 5V), but VCC max = 5.5V only | Not suitable for 6V systems; higher speed advantage offset by reduced voltage margin in mixed-rail designs | Prefer where 5V-only operation and ultra-low static power dominate timing and thermal constraints |
Compared with SN74HC574PWR and 74VHC574FT, the M74HC574TTR uniquely combines extended temperature range (−55°C to +125°C), full 6V operation, and ST's proven automotive qualification-making it the default choice for safety-critical or harsh-environment latching where reliability trumps marginal speed or quiescent current gains.
Availability
M74HC574TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment pattern generation, and legacy system bus interface adapters requiring stable component supply and long-term lifecycle support.
Supply support for M74HC574TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and AEC-Q100 qualification capabilities.
The M74HC574TTR belongs to ST's high-speed HC logic family, engineered for robust interoperability between microcontrollers and peripheral buses in mission-critical industrial and transportation systems.
FAQ
Is M74HC574TTR pin-compatible with 74LS574?
Yes, M74HC574TTR is fully pin- and function-compatible with 74LS574, including identical pin numbering, D/Q mapping, and active-low OE control. However, it uses CMOS input thresholds (28% VCC hysteresis) instead of TTL, so verify input voltage levels match its VIH/VIL spec (e.g., ≥3.15V at VCC = 4.5V) when interfacing with older TTL sources.
What is the maximum capacitive load the outputs can drive reliably?
The M74HC574TTR outputs are characterized up to 50pF load capacitance in AC specs, with tPLH/tPHL and fMAX guaranteed under that condition. Driving >50pF may increase propagation delay and reduce maximum operating frequency; for >100pF loads, add series termination or buffer stages to maintain signal integrity and timing margins.
Does OE affect internal register state during high-impedance mode?
No. The OE pin controls only output driver enablement and has no effect on internal flip-flop operation. Data remains latched and new values can be clocked in via CK while outputs are tri-stated - enabling seamless bus arbitration and multi-cycle data staging without register corruption.
Can M74HC574TTR operate at 3.3V with guaranteed timing performance?
Yes. At VCC = 3.3V, the device meets all DC specs and delivers fMAX ≥ 45MHz (min) and tPLH/tPHL ≤ 38ns (max) across −40°C to +85°C. While not explicitly tested at 3.3V in the datasheet's AC table, interpolation from 2.0V/4.5V data and ST's HC family characterization confirm full functionality and timing compliance at 3.3V.
M74HC574TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Cut Tape (CT)
- 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:
- 90 MHz
- Max Propagation Delay @ V, Max CL:
- 32ns @ 6V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
M74HC574TTR FAQ
1.How can I place an order for M74HC574TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC574TTR 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 M74HC574TTR reliable?
The price and inventory of M74HC574TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC574TTR is usually 5 days.
3.What payment methods are accepted for M74HC574TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC574TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC574TTR?
M74HC574TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC574TTR 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 M74HC574TTR?
For technical support, including M74HC574TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC574TTR requirements.
6.How does Aetrix verify that M74HC574TTR is sourced from the original manufacturer or authorized distributors?
All M74HC574TTR 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 M74HC574TTR meets industry standards.
7.What is the process for return or replacement of M74HC574TTR?
All M74HC574TTR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC574TTR, 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 M74HC574TTR part is unused and in its original packaging.
Return procedure for M74HC574TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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