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Renesas 74FCT2245ATQG8
- Part No.:
- 74FCT2245ATQG8
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT2245ATQG8.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,506
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Product details
Overview
74FCT2245ATQG8 from Renesas Electronics is a FAST CMOS octal bidirectional transceiver with industrial temperature range (–40°C to +85°C), 5V supply, ±15mA output drive, and true TTL input/output compatibility (VOH = 2.4V min at –15mA, VOL = 0.5V max at 12mA). It enables asynchronous two-way data bus communication in embedded control systems.
For engineers reviewing the 74FCT2245ATQG8 datasheet, 74FCT2245ATQG8 pinout, 74FCT2245ATQG8 application, or 74FCT2245ATQG8 equivalent, key selection criteria include direction control via T/R input, high-impedance tri-state operation via active-low OE, balanced drive with current-limiting resistors, and SOIC/QSOP package compatibility for legacy bus interface designs.
Technical Context
The 74FCT2245ATQG8 implements an asynchronous bidirectional data path between two 8-bit buses using dual-metal CMOS technology. Direction is controlled by the T/R input: logic HIGH enables A→B transmission, logic LOW enables B→A reception. Output enable (OE) is active-low and places both A and B ports in high-Z when asserted.
It features resistor-limited outputs (–15mA IOH, 12mA IOL), low ground bounce, controlled fall times, and meets JEDEC Standard 18. The device is a plug-in replacement for 74FCT245T, with identical pinout and function but improved noise immunity and drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0V ±5% - fixed single-rail operation compatible with legacy TTL/CMOS systems |
| Propagation Delay | 1.5–4.6 ns (A↔B) - supports high-speed bus handshaking up to ~200 MHz effective toggle rate |
| Output Drive | –15mA IOH / 12mA IOL - sufficient to drive 50Ω terminated lines or multiple TTL inputs without external buffers |
| Input Levels | VIH = 2.0V min, VIL = 0.8V max - ensures robust logic recognition across voltage margins and noise |
| Leakage Current | ≤1 μA (max) - minimizes standby power and prevents unintended bus loading during high-Z states |
| Operating Temp | –40°C to +85°C - qualified for industrial control, motor drives, and factory automation environments |
Pinout & Package
74FCT2245ATQG8 is packaged in a 20-pin QSOP (Quarter-size Small Outline Package) with 0.65 mm pitch, RoHS-compliant and green-processed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 1) | Active-low output enable | Disables both A and B ports into high-impedance state; critical for bus arbitration and multi-master systems |
| T/R (Pin 2) | Transmit/Receive direction control | HIGH = A→B data flow; LOW = B→A data flow; asynchronous, no clock required |
| A0–A7 (Pins 3–4, 7–10) | Side-A bidirectional I/O | Connects to local processor/data bus; driven or sensed depending on T/R state |
| B0–B7 (Pins 12–19) | Side-B bidirectional I/O | Connects to peripheral or expansion bus; electrically isolated from A side except during active transfer |
| VCC (Pin 20) | Power supply | 5V rail with decoupling required near pin; powers internal logic and output drivers |
| GND (Pin 11) | Ground reference | Common return for all I/O and supply currents; must be low-inductance connection to minimize switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-limited outputs | Integrated current-limiting resistors reduce ground bounce and eliminate need for external series termination |
| TTL-compatible I/O | Guaranteed VOH ≥2.4V at –15mA and VOL ≤0.5V at 12mA - interoperable with standard 5V TTL logic families |
| Low leakage | ≤1 μA max input/output leakage - preserves bus integrity during high-Z states and reduces static power |
| JEDEC Std 18 compliance | Fully compliant with industry-standard timing, voltage, and drive requirements for 5V bus transceivers |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Expansion |
|---|---|
Use Scenario: Connecting a 5V microcontroller bus to modular I/O cards in a programmable logic controller rack. IC Role / Device Role / Timing Role: Bidirectional level- and protocol-transparent data bridge between CPU and field I/O modules. Use Value: Enables hot-swappable card insertion with OE-controlled isolation and T/R-directed data routing without added glue logic. | Use Scenario: Extending address/data bus of an 8051 or Z80-based embedded system to external memory or peripherals. IC Role / Device Role / Timing Role: Asynchronous bus transceiver managing data flow direction between CPU and external SRAM or UART. Use Value: Delivers sub-5ns propagation delay and 12mA drive to meet tight timing budgets while supporting multiple load fanout. |
| Automated Test Equipment (ATE) Signal Routing | Industrial Display Controller Interface |
Use Scenario: Routing digital test patterns between pattern generator and DUT in boundary-scan or functional test fixtures. IC Role / Device Role / Timing Role: Reconfigurable bidirectional signal path controlled by test sequencer GPIOs (OE and T/R). Use Value: High-Z isolation during test setup prevents back-driving; resistor-limited outputs suppress reflections on long fixture traces. | Use Scenario: Interfacing a graphics controller ASIC to a parallel LCD module with separate command/data lanes. IC Role / Device Role / Timing Role: Direction-switched data conduit for 8-bit parallel video or command bus with precise timing alignment. Use Value: Matches 5V display timing specs and provides clean edge transitions without overshoot due to controlled output fall times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT2245CTQG8 | Same function and pinout; C-grade (0°C to +70°C) instead of A-grade (–40°C to +85°C) | Limited to commercial-temperature environments; not suitable for industrial enclosures or outdoor equipment | Select only if ambient operating temperature remains within 0–70°C and cost sensitivity outweighs thermal margin |
| SN74LVC245APWR | 3.3V-only supply (1.65–3.6V), lower drive (±24mA), different voltage thresholds (VIH = 2.0V min at 3.3V) | Requires level-shifting when interfacing with 5V buses; incompatible without translation circuitry | Choose only for new 3.3V-only designs where power efficiency and smaller footprint outweigh legacy 5V compatibility |
Compared with 74FCT2245CTQG8 and SN74LVC245APWR, the 74FCT2245ATQG8 uniquely delivers industrial-temperature operation, 5V TTL compatibility, and resistor-limited drive in a drop-in-replacement QSOP package-making it the sole option for retrofitting or maintaining legacy 5V industrial bus architectures.
Availability
74FCT2245ATQG8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus expansion, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for 74FCT2245ATQG8 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 IDT FCT family-including the 74FCT2245ATQG8-is designed specifically for robust, low-noise 5V bus interfacing in industrial control and legacy system upgrades, emphasizing pin compatibility, JEDEC compliance, and thermal reliability.
FAQ
What is the operating voltage range for the 74FCT2245ATQG8?
The 74FCT2245ATQG8 operates at a nominal VCC of 5.0V ±5%, meaning its valid supply range is 4.75V to 5.25V. It is not rated for 3.3V or mixed-voltage operation. This fixed 5V requirement ensures compatibility with legacy TTL systems and guarantees specified drive strength, timing, and noise margins per JEDEC Standard 18.
Does the 74FCT2245ATQG8 support hot-swap or live-insertion on a powered bus?
The 74FCT2245ATQG8 supports hot-swap operation when OE is held HIGH (disabled) during insertion, placing both A and B ports in high-Z. Its absolute maximum terminal voltage rating (–0.5V to VCC+0.5V) and ≤1μA leakage ensure safe biasing before activation. However, T/R and OE must be controlled by system logic after insertion to avoid bus contention.
How does the 74FCT2245ATQG8 differ from the 74FCT245T series?
The 74FCT2245ATQG8 is a direct plug-in replacement for the 74FCT245T series, sharing identical pinout, function, and timing. Key improvements include enhanced output drive (–15mA/12mA vs. –12mA/12mA), tighter propagation delay (4.6ns max vs. 5.0ns), and integrated current-limiting resistors that reduce ground bounce and eliminate external termination needs.
Can the 74FCT2245ATQG8 interface directly with 3.3V logic devices?
No, the 74FCT2245ATQG8 is a 5V-only device with TTL-compatible input thresholds (VIH = 2.0V min) and 5V output swing. While 3.3V logic outputs may meet its VIH threshold, its 5V outputs exceed the absolute maximum input voltage (typically 3.6V) of most 3.3V devices and will cause damage without level-shifting circuitry such as resistive dividers or dedicated translators.
What package type is used for the 74FCT2245ATQG8 and is it RoHS-compliant?
74FCT2245ATQG8 uses a 20-pin QSOP (Quarter-size Small Outline Package) with 0.65 mm lead pitch. Per the ordering information in the datasheet, the "QG" suffix denotes green (halogen-free, lead-free) processing, and the device complies with RoHS Directive 2011/65/EU and REACH regulations.
74FCT2245ATQG8 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
74FCT2245ATQG8 FAQ
1.How can I place an order for 74FCT2245ATQG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT2245ATQG8 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 74FCT2245ATQG8 reliable?
The price and inventory of 74FCT2245ATQG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT2245ATQG8 is usually 5 days.
3.What payment methods are accepted for 74FCT2245ATQG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT2245ATQG8 transactions.
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4.How is shipping managed for 74FCT2245ATQG8?
74FCT2245ATQG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT2245ATQG8 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 74FCT2245ATQG8?
For technical support, including 74FCT2245ATQG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT2245ATQG8 requirements.
6.How does Aetrix verify that 74FCT2245ATQG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT2245ATQG8 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 74FCT2245ATQG8 meets industry standards.
7.What is the process for return or replacement of 74FCT2245ATQG8?
All 74FCT2245ATQG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT2245ATQG8, 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 74FCT2245ATQG8 part is unused and in its original packaging.
Return procedure for 74FCT2245ATQG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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