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Renesas 74FCT3245QG
- Part No.:
- 74FCT3245QG
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT3245QG.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,792
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Product details
Overview
74FCT3245QG from Renesas Electronics (formerly IDT) is a 3.3V CMOS octal bidirectional transceiver with industrial temperature range (–40°C to +85°C), 7 ns max propagation delay, ±60 mA output drive, and QSOP-20 green package. It enables asynchronous bus communication between two 8-bit data paths using DIR and OE control pins, commonly used in backplane interface and memory expansion systems.
For engineers reviewing the 74FCT3245QG datasheet, 74FCT3245QG pinout, 74FCT3245QG application, or 74FCT3245QG equivalent, key selection criteria include bidirectional flow control timing, rail-to-rail output swing for noise margin, 3.3V supply tolerance (2.7–3.6V), low static power (0.4 µW typ), and industrial-grade ESD robustness (>2000 V HBM).
Technical Context
The 74FCT3245QG implements dual-bus bidirectional data transfer via a single direction-control (DIR) input and active-low output-enable (OE) input that overrides DIR to place both A- and B-side I/Os in high-impedance state. All inputs feature hysteresis (150 mV typ) to enhance noise immunity in noisy industrial environments.
It integrates series current-limiting resistors on outputs to suppress ground bounce and undershoot, enabling clean signal edges without external termination. The device operates across full industrial voltage (2.7–3.6 V) and temperature (–40°C to +85°C) ranges, with guaranteed switching performance up to 7 ns propagation delay at 3.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports wide 3.3 V system tolerance and brown-out resilience |
| Propagation Delay | 7 ns max (A↔B) - ensures sub-140 MHz asynchronous bus timing margin |
| Output Drive | ±60 mA - drives standard TTL loads and short PCB traces without buffers |
| Input Hysteresis | 150 mV - improves noise rejection on shared control lines in electrically noisy systems |
| Static ICC | 0.4 µW typ - enables ultra-low-power standby in always-on industrial controllers |
| ESD Rating | >2000 V HBM - meets MIL-STD-883 Class 3A for handling and board-level reliability |
| Operating Temp | –40°C to +85°C - qualified for industrial automation, motor drives, and outdoor equipment |
Pinout & Package
74FCT3245QG is packaged in a 20-pin Quarter-size Small Outline Package (QSOP), green RoHS-compliant, with 0.65 mm pitch and 7.2 mm × 5.3 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Asserted LOW disables all A/B I/Os into high-Z; overrides DIR for safe bus isolation |
| 2 (DIR) | Direction Control | LOW = B→A data flow; HIGH = A→B; only active when OE = LOW |
| 3–10 (A1–A8) | Side-A I/O Ports | Bidirectional 3.3 V CMOS terminals; internally terminated with series resistors |
| 11 (GND) | Ground Reference | Primary return path for logic and output current; decoupling required within 5 mm |
| 12–19 (B1–B8) | Side-B I/O Ports | Matched impedance and timing to A-side; supports symmetrical bus loading |
| 20 (VCC) | Power Supply | 3.3 V supply input; requires local 100 nF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | VOH ≥ VCC–0.2 V, VOL ≤ 0.2 V - maximizes noise margin in mixed-voltage systems |
| Integrated series output resistors | Reduces ground bounce and overshoot - eliminates need for discrete 22–33 Ω series terminators |
| Hysteresis on all inputs | 150 mV typical - prevents chatter on slow-rising control signals (e.g., reset, enable from microcontrollers) |
| Low dynamic power consumption | ICCD = 60 µA/MHz - enables high-speed toggling without thermal derating in dense layouts |
| Industrial-grade ESD protection | 2000 V HBM, 200 V MM - sustains repeated handling and field-level ESD events |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Isolating and translating data between CPU local bus and peripheral expansion slot in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing 8-bit parallel address/data handshaking with DIR-controlled flow direction. Use Value: Enables hot-swap-capable bus arbitration using OE-driven high-Z isolation and 7 ns propagation delay for cycle-accurate timing. | Use Scenario: Extending SRAM or Flash memory width in embedded instrumentation with separate address and data buses. IC Role / Device Role / Timing Role: Octal bidirectional buffer synchronizing read/write transfers between memory controller and external memory banks. Use Value: Rail-to-rail outputs ensure full logic swing across long traces; hysteresis prevents metastability during memory access strobes. |
| Motor Drive Control Panel | Modular I/O Module Interconnect |
Use Scenario: Interfacing FPGA-based motion sequencer with isolated analog/digital I/O modules over ribbon-cable backplane. IC Role / Device Role / Timing Role: Direction-controlled data bridge between FPGA GPIO bank and modular sensor/actuator interface ASICs. Use Value: ±60 mA drive strength reliably clocks status registers across 15 cm cables; industrial temp rating matches drive enclosure ambient. | Use Scenario: Enabling plug-and-play module interconnection in factory automation racks with hot-swappable I/O cards. IC Role / Device Role / Timing Role: Bus-isolation transceiver providing OE-gated bidirectional data exchange between master controller and slave modules. Use Value: OE override allows safe insertion/removal without bus contention; QSOP-20 footprint fits tight 1U rack spacing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower drive (±24 mA), 1.65–3.6 V VCC, no integrated series resistors | Requires external termination for clean edges on >10 cm traces; suited for low-power portable designs | Select when lower static power (1 µA max ICC) and wider voltage range outweigh need for built-in signal integrity features |
| 74ALVC245MTCX | Same 3.3 V range, ±24 mA drive, no hysteresis, TSSOP-20 package | Lacks input hysteresis and series resistors - more sensitive to noise and requires careful layout | Prefer for cost-sensitive consumer applications where industrial ESD/noise immunity is not required |
Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74FCT3245QG delivers higher drive strength, built-in signal integrity features (series resistors, hysteresis), and superior industrial ESD rating - making it optimal for ruggedized, high-reliability bus bridging where layout margin is constrained.
Availability
74FCT3245QG is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and motor drive control panels requiring stable component supply across extended lifecycle programs.
Supply support for 74FCT3245QG 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 connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 74FCT3245QG belongs to Renesas' legacy IDT logic family, engineered for high-speed, low-noise bidirectional bus interfacing in industrial control and communications equipment with strict reliability and timing requirements.
FAQ
What is the maximum operating frequency supported by the 74FCT3245QG?
The 74FCT3245QG does not specify a clock frequency since it is an asynchronous transceiver. Its 7 ns maximum propagation delay supports reliable operation in systems with data valid windows exceeding 14 ns, enabling effective use in 70+ MHz bus cycles when combined with appropriate setup/hold margins. Timing is governed by signal edge rates and load conditions-not a fixed clock domain.
Does the 74FCT3245QG support mixed-voltage operation between 3.3 V and 5 V buses?
No, the 74FCT3245QG is a 3.3 V-only device with absolute maximum input voltage of VCC+0.5 V (≤3.85 V at 3.3 V supply). Direct connection to 5 V buses risks permanent damage. For 3.3 V ↔ 5 V translation, a dedicated level-shifter such as the TXB0108 or SN74AVC4T245 must be used upstream of the 74FCT3245QG.
Can the 74FCT3245QG be used with OE and DIR tied permanently to logic levels?
Yes - OE can be hard-wired LOW for always-enabled operation, and DIR can be fixed HIGH or LOW to enforce unidirectional flow (A→B or B→A). However, doing so forfeits dynamic bus direction control and isolation capability. For applications requiring runtime reconfiguration or hot-plug safety, OE and DIR must remain actively driven.
What is the purpose of the series current-limiting resistors inside the 74FCT3245QG?
The internal series resistors in the 74FCT3245QG dampen output edge rates to reduce ground bounce, overshoot, and EMI - particularly critical in multi-load bus environments. They eliminate the need for discrete 22–33 Ω series terminators on each line, simplifying layout and reducing BOM count while maintaining signal integrity on traces up to ~10 cm.
Is the 74FCT3245QG pin-compatible with the 74FCT3245A variant?
Yes - the 74FCT3245QG and 74FCT3245AQG (or 74FCT3245A) share identical pinout, electrical specifications, and functional behavior. The "A" suffix denotes an improved version with tighter timing (e.g., 4.6 ns max tPLH vs. 7 ns), but both are mechanically and logically interchangeable in QSOP-20. System timing margins should be verified against the slower 74FCT3245QG spec if mixing variants.
74FCT3245QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 24mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
74FCT3245QG FAQ
1.How can I place an order for 74FCT3245QG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT3245QG 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 74FCT3245QG reliable?
The price and inventory of 74FCT3245QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT3245QG is usually 5 days.
3.What payment methods are accepted for 74FCT3245QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT3245QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT3245QG?
74FCT3245QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT3245QG 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 74FCT3245QG?
For technical support, including 74FCT3245QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT3245QG requirements.
6.How does Aetrix verify that 74FCT3245QG is sourced from the original manufacturer or authorized distributors?
All 74FCT3245QG 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 74FCT3245QG meets industry standards.
7.What is the process for return or replacement of 74FCT3245QG?
All 74FCT3245QG units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT3245QG, 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 74FCT3245QG part is unused and in its original packaging.
Return procedure for 74FCT3245QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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