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STMicroelectronics 74ACT574TTR
- Part No.:
- 74ACT574TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT574TTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,721
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Product details
Overview
74ACT574TTR from STMicroelectronics is an octal D-type flip-flop with 3-state non-inverting outputs, clocked on the LOW-to-HIGH edge, operating at 4.5–5.5 V, delivering tPLH/tPHL ≤ 11 ns (typ.), and supporting 24 mA output drive. It serves as a high-speed data latch and bus interface in synchronous digital systems such as address/data buffers in microprocessor peripherals.
For engineers reviewing the 74ACT574TTR datasheet, 74ACT574TTR pinout, 74ACT574TTR application, or 74ACT574TTR equivalent, key selection criteria include 3-state output timing control, TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), propagation delay symmetry, 50 Ω transmission line drive capability, and latch-up immunity for mixed-logic interfacing.
Technical Context
The 74ACT574TTR implements eight independent D-type latches triggered by the rising edge of CK, with asynchronous 3-state control via active-low OE. Its C2MOS sub-micron process enables symmetrical |IOH| = |IOL| ≥ 24 mA and balanced tPLH ≅ tPHL propagation delays.
All inputs and outputs feature 2 kV ESD protection, and the device maintains internal state retention during OE-high (high-impedance) operation-allowing concurrent data capture and bus release without pipeline stalls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS logic rails and noise margin stability |
| fMAX | 270 MHz (typ.) - supports high-throughput data sampling in fast control loops and memory interfaces |
| tPLH / tPHL | ≤ 11 ns (max @ VCC=5.0 V) - guarantees deterministic setup/hold timing in 100+ MHz synchronous designs |
| IOL / IOH | ≥ 24 mA (min) - drives 50 Ω transmission lines directly without external buffers |
| VIH / VIL | 2.0 V (min) / 0.8 V (max) - ensures reliable interfacing with legacy TTL outputs |
| ICC (Quiescent) | 4 µA (max @ TA=25°C) - enables low-static-power operation in always-on control logic |
Pinout & Package
TSSOP-20 package: 6.4 mm × 6.5 mm body, 0.65 mm pitch, 1.1 mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - decouples outputs from bus while preserving internal latch state |
| 2–9 | D0–D7 | Data inputs - sampled on CK rising edge; TTL-compatible thresholds ensure robust signal acquisition |
| 11 | CK | Clock input - edge-triggered (LOW-to-HIGH); minimum pulse width 3.0 ns supports >100 MHz operation |
| 12–19 | Q0–Q7 | Non-inverting 3-state outputs - high-drive (24 mA) and low-impedance (≈15 Ω) for clean signal integrity |
| 10 | GND | Ground reference - dedicated return path minimizes switching noise coupling into logic threshold |
| 20 | VCC | Positive supply - operates across full 4.5–5.5 V range with stable VIH/VIL over temperature |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | OE-independent internal latch operation allows data capture and bus release in same cycle |
| Transmission Line Drive | Guaranteed 50 Ω line driving eliminates need for external series termination resistors |
| Latch-Up Immunity | Enhanced C2MOS process provides robust immunity against parasitic SCR activation |
| ESD Protection | 2 kV HBM on all pins - reduces risk of field failure during board handling and assembly |
Applications
| Microprocessor Address Latching | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Holding multiplexed address bus signals during memory access cycles in 80C51 or Z80-based controllers. IC Role / Device Role / Timing Role: Edge-triggered D-latch synchronizing address valid window to CPU clock edge. Use Value: Eliminates external glue logic by providing precise, low-skew address hold with 3-state isolation during data phase. | Use Scenario: Buffering and isolating digital I/O modules in modular PLC backplanes with shared data buses. IC Role / Device Role / Timing Role: Bus interface register enabling hot-swap-safe module insertion and removal. Use Value: OE-controlled high-impedance outputs prevent bus contention during module reconfiguration or fault conditions. |
| Test Equipment Pattern Generation | Automotive Body Control Unit |
Use Scenario: Generating synchronized stimulus patterns for digital IC functional testing using programmable logic sources. IC Role / Device Role / Timing Role: High-speed parallel data register feeding pattern sequencer outputs. Use Value: 270 MHz fMAX and 11 ns propagation support sub-4 ns timing resolution in ATE applications. | Use Scenario: Isolating sensor input conditioning circuits from CAN/LIN bus transceivers in centralized body domain controllers. IC Role / Device Role / Timing Role: Level-shifting and bus-gating interface between 5 V analog front-end and digital subsystems. Use Value: TTL-compatible inputs accept direct connection to legacy sensor comparators; 3-state outputs prevent cross-talk during sleep mode. |
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 |
|---|---|---|---|
| SN74ACT574PWR | Same AC/DC specs; TSSOP-20 package with identical pinout and thermal profile | No functional difference; TI version qualified to different AEC-Q200 stress test subsets | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation |
| 74LCX574MTCX | Lower VCC range (2.0–3.6 V); 3.3 V optimized; tPLH/tPHL ≈ 5.5 ns (faster at 3.3 V) | Not suitable for 5 V systems; requires level translation when interfacing with TTL | Prefer for new 3.3 V designs where lower power and speed outweigh 5 V compatibility needs |
Compared with SN74ACT574PWR, 74ACT574TTR offers identical electrical behavior but distinct traceability and manufacturing origin; versus 74LCX574MTCX, it trades higher voltage operation and TTL interoperability for reduced speed and 3.3 V exclusivity.
Availability
74ACT574TTR is available at Aetrix Electronics and suitable for microprocessor address latching, industrial PLC I/O expansion, test equipment pattern generation, and automotive body control unit designs requiring stable component supply across extended temperature ranges (–55°C to +125°C).
Supply support for 74ACT574TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer applications.
The 74ACT family targets high-speed, low-power 5 V logic interfacing-specifically engineered to bridge TTL, NMOS, and advanced CMOS systems with robust noise immunity and bus-driving capability.
FAQ
What is the maximum clock frequency supported by the 74ACT574TTR?
The 74ACT574TTR supports a maximum clock frequency of 270 MHz (typical) at VCC = 5.0 V and TA = 25°C, with guaranteed minimum operation up to 85 MHz across the full industrial temperature range (–55°C to +125°C), as confirmed by AC electrical characterization under CL = 50 pF and RL = 500 Ω conditions.
Does the 74ACT574TTR retain data when OE is high?
Yes-the 74ACT574TTR retains its internal latch state regardless of OE logic level. When OE is high, outputs enter high-impedance mode, but clocked data updates continue normally at D inputs on each CK rising edge, enabling seamless bus arbitration and pipelined operation.
Can the 74ACT574TTR drive a 50 Ω transmission line directly?
Yes-it is explicitly characterized for 50 Ω transmission line driving capability per output, with symmetrical |IOH| = |IOL| ≥ 24 mA (min) ensuring clean edge integrity without external series termination, validated across VCC = 4.5–5.5 V and temperature extremes.
Is the 74ACT574TTR pin-compatible with standard 74LS574 devices?
Yes-it is pin- and function-compatible with the 74-series 574 family, including 74LS574 and 74HC574, sharing identical TSSOP-20 pinout, D/Q/OE/CK/GND/VCC assignments, and truth table behavior, though with improved speed, drive strength, and noise margins.
74ACT574TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74ACT
- 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:
- 270 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74ACT574TTR FAQ
1.How can I place an order for 74ACT574TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT574TTR 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 74ACT574TTR reliable?
The price and inventory of 74ACT574TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT574TTR is usually 5 days.
3.What payment methods are accepted for 74ACT574TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT574TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT574TTR?
74ACT574TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT574TTR 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 74ACT574TTR?
For technical support, including 74ACT574TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT574TTR requirements.
6.How does Aetrix verify that 74ACT574TTR is sourced from the original manufacturer or authorized distributors?
All 74ACT574TTR 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 74ACT574TTR meets industry standards.
7.What is the process for return or replacement of 74ACT574TTR?
All 74ACT574TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT574TTR, 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 74ACT574TTR part is unused and in its original packaging.
Return procedure for 74ACT574TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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