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Renesas 74FCT574ATQG8
- Part No.:
- 74FCT574ATQG8
- Manufacturer:
- Renesas
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT574ATQG8.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,802
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Product details
Overview
74FCT574ATQG8 from Renesas Electronics (formerly IDT) is an octal D-type register with 3-state outputs, designed for high-speed data latching and bus interface in industrial control and embedded systems. It features TTL-compatible inputs/outputs (VOH = 3.3V typ., VOL = 0.3V typ.), ±15mA/48mA output drive, 5V supply operation, and industrial temperature range (–40°C to +85°C).
For engineers reviewing the 74FCT574ATQG8 datasheet, 74FCT574ATQG8 pinout, 74FCT574ATQG8 application, or 74FCT574ATQG8 equivalent, key selection criteria include propagation delay (≤5.2 ns), output enable/disable timing (≤5.5 ns), low input leakage (≤1 µA), and SOIC-20 package compatibility with legacy 74-series logic designs.
Technical Context
The 74FCT574ATQG8 implements eight edge-triggered D flip-flops sharing a common clock (CP) and active-low 3-state output enable (OE). Data is latched on the low-to-high transition of CP, and outputs enter high-impedance state when OE is high.
It uses advanced dual-metal CMOS technology to achieve true TTL voltage compatibility while maintaining CMOS power efficiency (ICC ≤ 1 mA typ.). The device meets JEDEC Std. 18 and supports live insertion via power-off disable outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT Fast CMOS - enables 5V TTL system interoperability without level shifters |
| Propagation Delay (tPLH/tPHL) | ≤5.2 ns at CL = 50 pF - supports >100 MHz clock domains in latch-critical paths |
| Output Drive | –15 mA IOH / +48 mA IOL - drives heavy capacitive loads or multiple TTL inputs directly |
| Supply Voltage | 5.0 V ±5% - matches standard industrial 5V rail with no regulation overhead |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including factory automation |
| Input Leakage | ≤1 µA max - ensures reliable static logic levels in low-power standby modes |
| Quiescent Current | ≤1 mA max - reduces system-level idle power in always-on control modules |
Pinout & Package
74FCT574ATQG8 is packaged in a 20-pin Small Outline IC (SOIC-20) with standard 0.3-inch body width and 0.050-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 7, 9, 10 | D0–D7 Data Inputs | Asynchronous parallel data inputs latched on CP rising edge |
| 6 | CP Clock Pulse | Edge-triggered clock; data sampled on LOW-to-HIGH transition only |
| 11 | OE Output Enable (active low) | Controls all Qx/Qx outputs simultaneously; high = high-Z, low = enabled |
| 12, 13, 14, 15, 16, 17, 18, 19 | Q0–Q7 True Outputs | 3-state buffered outputs reflecting registered D-input values when OE is low |
| 20 | VCC | Positive supply terminal (5V) |
| 10 | GND | Ground reference for logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible I/O thresholds | VIH = 2.0 V min, VIL = 0.8 V max - eliminates need for external level translation in mixed-logic systems |
| High-drive 3-state outputs | 48 mA sink capability - interfaces directly with multiple 74LS loads or LED indicators without buffers |
| Live-insertion support | Outputs disable during power-down - prevents bus contention when hot-swapping boards in backplane systems |
| Low dynamic power consumption | ICCD ≤ 0.25 mA/MHz - minimizes switching noise and thermal load in dense logic arrays |
Applications
| Industrial PLC I/O Modules | Legacy Bus Interface Adapters |
|---|---|
Use Scenario: Latching sensor status or actuator command signals in programmable logic controller racks with 5V backplanes. IC Role / Device Role / Timing Role: Octal D register synchronizing asynchronous field signals to the PLC scan cycle clock. Use Value: 5.2 ns propagation delay ensures deterministic sampling within tight 10 µs I/O update windows. | Use Scenario: Bridging modern microcontroller buses to legacy ISA or VME peripheral cards requiring 74-series timing. IC Role / Device Role / Timing Role: Bidirectional data latch buffering address/data lines between mismatched speed domains. Use Value: 48 mA IOL drives long traces and multiple TTL inputs without signal degradation. |
| Test Equipment Digital Pattern Generators | Avionics Maintenance Diagnostic Interfaces |
Use Scenario: Holding test vector patterns stable during high-speed digital stimulus delivery to UUTs. IC Role / Device Role / Timing Role: Parallel data register capturing pattern words from FPGA memory before clocked output. Use Value: Low 1 µA input leakage preserves pattern integrity during extended hold periods (>100 ms). | Use Scenario: Isolating ground-referenced diagnostic tools from aircraft avionics busses operating at varying potentials. IC Role / Device Role / Timing Role: 3-state register enabling safe connection/disconnection of maintenance ports without disrupting flight-critical buses. Use Value: Power-off disable behavior prevents bus contention during hot-plug operations per DO-160 Section 22. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F574N | Higher ICC (up to 25 mA), slower tPLH (15 ns max), no guaranteed industrial temp range | Limited to commercial temp (0°C to +70°C); unsuitable for extended ambient deployments | Select only for cost-sensitive, non-extended-temp legacy replacements where speed is not critical |
| 74AC574PC | Lower drive (–24 mA IOH), higher VIH (3.15 V min), 3.3V/5V tolerant inputs | Requires 3.3V supply or level-shifting for 5V systems; incompatible with pure 5V TTL fanout requirements | Prefer for mixed-voltage systems with 3.3V core logic; avoid when driving legacy TTL loads directly |
Compared with SN74F574N and 74AC574PC, the 74FCT574ATQG8 uniquely balances industrial temperature operation, TTL-compatible drive strength, and sub-6 ns timing-making it optimal for new designs requiring reliability across harsh environments without sacrificing speed or compatibility.
Availability
74FCT574ATQG8 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, and test equipment digital pattern generators requiring stable component supply and long-term obsolescence management.
Supply support for 74FCT574ATQG8 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.
The 74FCT574ATQG8 belongs to Renesas' legacy FCT logic family-designed specifically for drop-in replacement of 74LS/74ALS devices in industrial and military systems requiring enhanced speed, drive, and temperature resilience.
FAQ
What is the maximum clock frequency supported by the 74FCT574ATQG8?
The 74FCT574ATQG8 does not specify a maximum clock frequency in its datasheet. Instead, timing is defined by minimum pulse width (tW ≥ 5 ns) and setup/hold times (tSU = 2 ns, tH = 1.5 ns). These parameters support reliable operation up to approximately 100 MHz in typical PCB layouts with controlled trace impedance and 50 pF load.
Does the 74FCT574ATQG8 support mixed-voltage operation (e.g., 3.3V inputs with 5V supply)?
No. The 74FCT574ATQG8 is a 5V-only device. Its inputs are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V) but not 3.3V-tolerant. Applying 3.3V logic signals is acceptable since they exceed the VIH threshold; however, the device must be powered at 5.0 V ±5% and cannot operate from a 3.3V supply rail.
Is the 74FCT574ATQG8 pin-compatible with the 74LS574?
Yes. The 74FCT574ATQG8 uses the same 20-pin SOIC footprint and identical pinout as the 74LS574, including D0–D7, CP, OE, Q0–Q7, VCC, and GND assignments. This allows direct PCB replacement without layout changes, provided thermal and timing margins accommodate the faster FCT performance.
What is the meaning of "Q" and "G8" in the part number 74FCT574ATQG8?
In 74FCT574ATQG8, "Q" denotes the Quarter-size Small Outline Package (QSOP-20), and "G8" indicates green (lead-free, RoHS-compliant) finish per Renesas' ordering convention. The "AT" suffix specifies the industrial-grade temperature range (–40°C to +85°C) and FCT logic family speed grade.
Can the 74FCT574ATQG8 drive multiple 74LS inputs directly?
Yes. With IOL = +48 mA and each 74LS input drawing ~0.4 mA, the 74FCT574ATQG8 can drive up to 120 LS loads per output. In practice, trace capacitance and timing constraints typically limit fanout to 10–20 LS loads while maintaining <5 ns propagation delay and signal integrity.
74FCT574ATQG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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:
- -
- Max Propagation Delay @ V, Max CL:
- 6.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 1 mA
- Input Capacitance:
- 6 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
74FCT574ATQG8 FAQ
1.How can I place an order for 74FCT574ATQG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT574ATQG8 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 74FCT574ATQG8 reliable?
The price and inventory of 74FCT574ATQG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT574ATQG8 is usually 5 days.
3.What payment methods are accepted for 74FCT574ATQG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT574ATQG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT574ATQG8?
74FCT574ATQG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT574ATQG8 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 74FCT574ATQG8?
For technical support, including 74FCT574ATQG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT574ATQG8 requirements.
6.How does Aetrix verify that 74FCT574ATQG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT574ATQG8 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 74FCT574ATQG8 meets industry standards.
7.What is the process for return or replacement of 74FCT574ATQG8?
All 74FCT574ATQG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT574ATQG8, 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 74FCT574ATQG8 part is unused and in its original packaging.
Return procedure for 74FCT574ATQG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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