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Texas Instruments CY74FCT245DTQCT
- Part No.:
- CY74FCT245DTQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT245DTQCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,946
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Product details
Overview
CY74FCT245DTQCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data transfer between TTL-compatible systems. It features 64-mA sink / 32-mA source drive strength, 3.8-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and edge-rate control for noise reduction. It operates across –40°C to +85°C in a 20-pin QSOP package.
For engineers reviewing the CY74FCT245DTQCT datasheet, CY74FCT245DTQCT pinout, CY74FCT245DTQCT application, or CY74FCT245DTQCT equivalent, key selection criteria include bidirectional bus isolation timing, 5-V TTL logic compatibility, high-current 3-state drive capability, and industrial-temperature operation with Ioff protection.
Technical Context
The CY74FCT245DTQCT implements dual-bus bidirectional data flow controlled by independent T/R (transmit/receive) and OE (output enable) inputs. Its internal architecture supports simultaneous A→B or B→A transfer with high-impedance disable on both ports when OE is high.
It uses FCT-family silicon with edge-rate control circuitry to limit slew rate, reducing ground bounce and crosstalk. The Ioff feature actively disables outputs and blocks current backflow when VCC = 0 V, enabling safe hot-insertion and partial-power-down system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT - TTL-compatible 5-V CMOS with improved noise immunity and drive |
| Propagation Delay | 3.8 ns max (A↔B path) - enables high-speed bus arbitration in real-time control systems |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads and multiple TTL inputs without buffering |
| Ioff Support | ±1 µA max at VCC = 0 V - prevents backfeed damage during power sequencing or hot-swap events |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements |
| Operating Temp | –40°C to +85°C - qualified for automotive under-hood and industrial PLC environments |
| Voltage Range | 4.75 V to 5.25 V - tight 5-V supply tolerance ensures stable logic thresholds across line regulation |
Pinout & Package
Package: 20-pin QSOP (DBQ), 0.635-mm pitch, 7.2-mm width, 2.65-mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 | Input/output port A - connects to local microcontroller or peripheral bus |
| 11, 12, 13, 14, 15, 16, 17, 18 | B0–B7 | Input/output port B - interfaces to external memory, FPGA, or legacy TTL subsystem |
| 9 | GND | Ground reference - must be low-inductance connection to minimize switching noise |
| 10 | VCC | 5-V supply - requires local 0.1-µF ceramic decoupling adjacent to pin |
| 19 | T/R | Direction control - high = A→B, low = B→A; asynchronous, no setup/hold required |
| 20 | OE | Output enable - high = all outputs high-Z; critical for bus contention avoidance |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt, improving signal integrity on dense PCBs |
| Ioff partial-power-down | Enables safe power gating of one side of bus while other side remains active - essential for modular backplane designs |
| Matched rise/fall times | Minimizes duty-cycle distortion on clocked data buses, preserving timing margins in synchronous transfers |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - interoperates directly with legacy 5-V TTL without level-shifting |
| High-current 3-state outputs | 64-mA sink capability allows driving >10 standard TTL loads per line - eliminates need for external buffers |
Applications
| Industrial PLC Backplane Interface | Automotive ECU Diagnostic Bus |
|---|---|
Use Scenario: Isolating CPU bus from field I/O modules in programmable logic controllers using shared parallel backplane wiring. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing read/write cycles between processor and distributed I/O cards with precise direction control. Use Value: 3.8-ns propagation delay ensures deterministic response within 100-ns real-time scan cycles; Ioff prevents module hot-swap faults. | Use Scenario: Bridging microcontroller UART or parallel diagnostic interface to legacy vehicle subsystems (e.g., ABS, airbag ECUs) via standardized 5-V bus. IC Role / Device Role / Timing Role: Level- and drive-compatible bus translator enabling communication between modern MCUs and older automotive modules. Use Value: 64-mA sink current drives long harness traces and multiple ECU inputs; –40°C to +85°C rating matches under-hood thermal envelope. |
| Test Equipment Signal Routing | Legacy Memory Expansion Interface |
Use Scenario: Dynamic reconfiguration of signal paths in automated test equipment (ATE) where DUT interfaces vary per test fixture. IC Role / Device Role / Timing Role: Reversible bus switch enabling flexible routing of address/data/control lines between instrument resources and device pins. Use Value: Independent OE and T/R control allows glitch-free bus reconfiguration mid-test; edge-rate control suppresses measurement noise. | Use Scenario: Expanding external RAM or ROM on 8-bit microcontrollers (e.g., 8051 derivatives) with separate address/data multiplexing. IC Role / Device Role / Timing Role: Bidirectional data buffer isolating MCU data bus from memory chip I/O, synchronized with WR/RD strobes. Use Value: Matched rise/fall times preserve data setup/hold windows; 3-state outputs prevent bus contention during memory access arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT245TQCT | Slower 7-ns max propagation delay; same pinout, drive, and temperature range | Suitable for cost-sensitive, lower-speed bus isolation where timing margin is relaxed | Select when 3.8-ns speed is unnecessary and BOM cost optimization is prioritized |
| SN74FCT245CTSOCT | Same speed grade (4.1 ns), SOIC-20 package instead of QSOP; identical electrical specs | Preferred for through-hole prototyping or legacy board layouts requiring wider pitch | Choose for manual assembly, rework-friendly footprint, or compatibility with existing SOIC-based designs |
Compared with CY74FCT245TQCT and SN74FCT245CTSOCT, the CY74FCT245DTQCT delivers the fastest propagation (3.8 ns) in the FCT245 family and the smallest footprint (QSOP), making it optimal for space-constrained, high-speed industrial and automotive bus interfaces where timing determinism is critical.
Availability
CY74FCT245DTQCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive diagnostic interfaces, and automated test equipment requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for CY74FCT245DTQCT 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CY74FCT245DTQCT belongs to TI's FCT logic family, engineered for high-noise-immunity, high-drive 5-V bus interfacing in mission-critical industrial and automotive systems where reliability and timing precision are non-negotiable.
FAQ
What is the maximum operating frequency supported by the CY74FCT245DTQCT?
The CY74FCT245DTQCT does not specify a maximum clock frequency, as it is a combinatorial transceiver without internal clocking. Its usable data rate depends on system-level timing margins. With a 3.8-ns max propagation delay and matched rise/fall times, it reliably supports bus data rates up to 100+ MHz in well-designed PCB layouts with controlled impedance and proper termination.
Does the CY74FCT245DTQCT support mixed-voltage operation between port A and port B?
No. The CY74FCT245DTQCT is a single-supply 5-V device (VCC = 4.75–5.25 V) with TTL-compatible input thresholds. Both A and B ports operate at the same logic voltage level and cannot translate between different voltage domains. For level shifting, discrete solutions or dedicated translators like TXB0108 are required.
How does the Ioff feature function in the CY74FCT245DTQCT during power-down sequences?
The Ioff circuitry in the CY74FCT245DTQCT actively disables all output drivers when VCC = 0 V, limiting leakage current to ±1 µA regardless of input or output pin voltage (up to 4.5 V). This prevents damaging reverse current flow from live buses into a powered-down section, enabling safe hot-plug and partial-power-down architectures in modular systems.
Can the CY74FCT245DTQCT be used without pull-up or pull-down resistors on unused control inputs?
No. Per TI's recommended operating conditions, all unused inputs-including T/R and OE-must be held statically at VCC or GND. Floating control inputs risk metastability, increased ICC, or unintended output states. OE should be tied to VCC (disable) or GND (enable) via direct connection or appropriate-value resistor; T/R must be fixed to define permanent direction if bidirectional operation is not needed.
What is the thermal resistance (θJA) of the CY74FCT245DTQCT in its QSOP package?
The CY74FCT245DTQCT in the 20-pin QSOP (DBQ) package has a specified junction-to-ambient thermal resistance (θJA) of 68°C/W under JEDEC-standard PCB mounting conditions (2-layer board, 1-in² copper pad). This value assumes proper thermal land design and adequate airflow; actual θJA may improve with enhanced PCB copper area or forced convection.
CY74FCT245DTQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
CY74FCT245DTQCT FAQ
1.How can I place an order for CY74FCT245DTQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245DTQCT 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 CY74FCT245DTQCT reliable?
The price and inventory of CY74FCT245DTQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245DTQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT245DTQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245DTQCT transactions.
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4.How is shipping managed for CY74FCT245DTQCT?
CY74FCT245DTQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245DTQCT 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 CY74FCT245DTQCT?
For technical support, including CY74FCT245DTQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245DTQCT requirements.
6.How does Aetrix verify that CY74FCT245DTQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT245DTQCT 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 CY74FCT245DTQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT245DTQCT?
All CY74FCT245DTQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245DTQCT, 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 CY74FCT245DTQCT part is unused and in its original packaging.
Return procedure for CY74FCT245DTQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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