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Renesas 74FCT2245CTQG8
- Part No.:
- 74FCT2245CTQG8
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT2245CTQG8.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,093
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Product details
Overview
74FCT2245CTQG8 from Renesas Electronics is a fast CMOS octal bidirectional transceiver with true TTL input/output compatibility, ±15mA output drive (IOH/ IOL), 4.1ns max propagation delay (A↔B), and industrial temperature range (–40°C to +85°C). It enables asynchronous two-way data bus communication in memory expansion, bus isolation, and level-shifting applications.
For engineers reviewing the 74FCT2245CTQG8 datasheet, 74FCT2245CTQG8 pinout, 74FCT2245CTQG8 application, or 74FCT2245CTQG8 equivalent, key selection criteria include bidirectional direction control via T/R, high-impedance enable/disable via OE, balanced current-limiting outputs for reduced ground bounce, and QSOP-20 green package compliance.
Technical Context
The 74FCT2245CTQG8 implements an advanced dual-metal CMOS process to achieve TTL-compatible voltage thresholds (VIH = 2.0V min, VIL = 0.8V max) while maintaining CMOS power efficiency (ICC ≤ 1mA typical). Its direction logic is fully asynchronous: T/R = HIGH enables A→B flow; T/R = LOW enables B→A flow.
Output enable (OE) is active-low and independently disables both A and B ports into high-Z state. The device integrates on-die current-limiting resistors to deliver –15mA IOH and 12mA IOL under VCC = 5.0V, minimizing undershoot and eliminating need for external series termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0V ±5% - fixed single-rail operation; no internal regulation or wide-VCC support |
| Propagation Delay | 4.1ns max (74FCT2245CT) - ensures sub-5ns timing margin for 100MHz+ bus handshaking |
| Output Drive | –15mA IOH / 12mA IOL - sufficient to drive 50Ω transmission lines or multiple TTL loads without buffers |
| Input Leakage | ≤ ±1μA max - prevents signal integrity degradation in high-impedance bus hold or floating-bus scenarios |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control, automation, and instrumentation |
| Capacitance | CIN ≤ 10pF, COUT ≤ 12pF - low loading supports >100MHz edge rates without excessive slew distortion |
Pinout & Package
74FCT2245CTQG8 is housed in a 20-pin QSOP (Quarter-size Small Outline Package) with 0.65mm pitch, RoHS-compliant "Green" finish, and standard JEDEC MO-137AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Active-low output enable | Drives both A and B ports into high-Z when HIGH; critical for bus arbitration and hot-swap isolation |
| T/R | Direction control input | HIGH = A→B data flow; LOW = B→A flow; asynchronous, no setup/hold required relative to data |
| A0–A7 | Side-A I/O terminals | Bidirectional ports with 3-state capability; share same pins for input and output depending on T/R state |
| B0–B7 | Side-B I/O terminals | Mirror-side I/Os; electrically identical to A-side but isolated by internal transceiver architecture |
| VCC, GND | Power supply pins | Single 5V rail; decoupling required within 1cm due to fast edge rates and simultaneous switching noise sensitivity |
Key Features
| Feature | Design Value |
|---|---|
| Current-limiting resistor outputs | Reduces ground bounce and overshoot by controlling di/dt; eliminates need for external series termination resistors |
| TTL-compatible I/O thresholds | VIH ≥ 2.0V and VIL ≤ 0.8V ensure interoperability with legacy 5V TTL and LVTTL systems without level shifters |
| Low quiescent current | ICC ≤ 1mA max at VCC = 5.0V enables use in power-constrained industrial modules with minimal standby draw |
| Industrial temperature rating | Validated operation from –40°C to +85°C supports deployment in motor drives, PLCs, and outdoor telecom infrastructure |
Applications
| Memory Expansion Interface | Microcontroller Bus Isolation |
|---|---|
Use Scenario: Connecting an 8-bit microcontroller data bus to external SRAM or EPROM with separate address/data multiplexing. IC Role / Device Role / Timing Role: Bidirectional data path controller that toggles direction synchronously with RD/WR strobes via T/R, enabling shared bus topology. Use Value: Eliminates need for discrete directional buffers and reduces PCB layer count by consolidating A/B bus routing in compact QSOP-20. | Use Scenario: Isolating a main system bus from a peripheral subsystem (e.g., sensor hub or display driver) during firmware updates or fault recovery. IC Role / Device Role / Timing Role: High-Z gatekeeper controlled by OE, preventing back-driving or contention when subsystem is powered down or reset. Use Value: Enables safe hot-plug operation and prevents latch-up events caused by voltage mismatches between powered/unpowered domains. |
| Legacy TTL-to-CMOS Translation | Industrial Backplane Data Link |
Use Scenario: Interfacing 5V TTL logic (e.g., 74LS series) with modern 5V CMOS controllers lacking native TTL input thresholds. IC Role / Device Role / Timing Role: Level-adaptive transceiver providing guaranteed VIH/VIL margins and drive strength matching TTL fan-out requirements. Use Value: Achieves drop-in compatibility without redesigning existing schematics or adding discrete bias networks. | Use Scenario: Transmitting parallel status or configuration data across a ruggedized 200mm backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Low-noise, current-controlled bus driver minimizing simultaneous switching output (SSO) noise on shared ground planes. Use Value: Meets EN 61000-4-2/4-4 immunity targets by limiting edge-induced ground bounce below 150mV peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Higher ICC (up to 35mA), no current-limiting resistors, slower tPLH (6ns max), DIP-20 only | Limited to through-hole prototyping; unsuitable for high-density QSOP layouts or low-noise industrial designs | Select only for legacy repair or breadboard validation where pin spacing >2.54mm is acceptable |
| 74LVC245APW | 3.3V-only supply, ±24mA drive, 3.5ns tPD, TSSOP-20, no TTL input compatibility | Requires level-shifting for 5V systems; incompatible with direct 5V TTL interface without external circuitry | Prefer for new 3.3V-only designs prioritizing speed and lower power; not a functional substitute in mixed-voltage environments |
Compared with SN74F245N and 74LVC245APW, the 74FCT2245CTQG8 uniquely delivers 5V TTL compatibility, integrated current limiting, QSOP-20 packaging, and industrial temperature support in a single device-making it the only option for robust, drop-in replacement of FCT245T in legacy 5V bus architectures.
Availability
74FCT2245CTQG8 is available at Aetrix Electronics and suitable for memory expansion interfaces, microcontroller bus isolation, and industrial backplane data links requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for 74FCT2245CTQG8 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 specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT applications.
The IDT FCT logic family-including the 74FCT2245CTQG8-is engineered for high-speed, low-noise 5V bus interfacing in industrial control and legacy system upgrades, emphasizing TTL compatibility, EMI resilience, and long-lifecycle support.
FAQ
What is the maximum operating frequency supported by the 74FCT2245CTQG8?
The 74FCT2245CTQG8 does not specify a clock frequency since it is an asynchronous transceiver. Its 4.1ns maximum propagation delay (tPLH/tPHL) supports reliable data handshaking up to approximately 120MHz for edge-aligned protocols. Actual usable frequency depends on system-level timing margins, load capacitance, and PCB trace length-verified per application using the test conditions in the Renesas datasheet (CL = 50pF, RL = 500Ω).
Does the 74FCT2245CTQG8 support hot-swap or live-insertion?
The 74FCT2245CTQG8 supports hot-swap operation when OE is held HIGH (disabled) during insertion, preventing bus contention. Its inputs tolerate –0.5V to VCC+0.5V, and outputs feature current-limiting resistors that suppress surge currents. However, full hot-swap robustness requires external protection (e.g., series resistors or TVS diodes) as the device lacks built-in hot-swap controllers or slew-rate limiting beyond its inherent current-limited outputs.
Can the 74FCT2245CTQG8 be used with 3.3V logic systems?
The 74FCT2245CTQG8 is specified only for 5.0V ±5% operation and is not 3.3V-tolerant. Its VIH minimum is 2.0V, which may appear compatible with 3.3V logic, but VOH/VOL specs assume VCC = 5V, and driving 3.3V inputs risks overvoltage damage. For 3.3V systems, Renesas recommends the 74LVC245APW instead. Using the 74FCT2245CTQG8 in 3.3V applications violates absolute maximum ratings and voids reliability guarantees.
What is the function of the T/R and OE pins on the 74FCT2245CTQG8?
The T/R (Transmit/Receive) pin controls data direction: HIGH enables A→B flow; LOW enables B→A flow. OE (Output Enable) is active-low and overrides T/R-when HIGH, both A and B ports enter high-impedance state regardless of T/R state. This dual-control architecture allows independent bus arbitration (via OE) and dynamic direction switching (via T/R), essential for half-duplex protocols like memory read/write cycles.
Is the 74FCT2245CTQG8 pin-compatible with the 74FCT245T series?
Yes-the 74FCT2245CTQG8 is a plug-in replacement for the 74FCT245T series per Renesas documentation. Both share identical pinout (QSOP-20), electrical behavior, and functional block diagram. The "2245" variant adds improved current-limiting and reduced ground bounce versus the original "245", but maintains full backward compatibility in layout, firmware, and timing-critical designs requiring no PCB changes.
74FCT2245CTQG8 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
- 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:
- 15mA, 12mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
74FCT2245CTQG8 FAQ
1.How can I place an order for 74FCT2245CTQG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT2245CTQG8 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 74FCT2245CTQG8 reliable?
The price and inventory of 74FCT2245CTQG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT2245CTQG8 is usually 5 days.
3.What payment methods are accepted for 74FCT2245CTQG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT2245CTQG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT2245CTQG8?
74FCT2245CTQG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT2245CTQG8 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 74FCT2245CTQG8?
For technical support, including 74FCT2245CTQG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT2245CTQG8 requirements.
6.How does Aetrix verify that 74FCT2245CTQG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT2245CTQG8 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 74FCT2245CTQG8 meets industry standards.
7.What is the process for return or replacement of 74FCT2245CTQG8?
All 74FCT2245CTQG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT2245CTQG8, 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 74FCT2245CTQG8 part is unused and in its original packaging.
Return procedure for 74FCT2245CTQG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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