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Texas Instruments CY74FCT245TQCT
- Part No.:
- CY74FCT245TQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT245TQCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
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Product details
Overview
CY74FCT245TQCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data routing between TTL-compatible logic domains. It supports 64-mA sink / 32-mA source drive, operates at 5 V (4.75–5.25 V), delivers 7 ns max propagation delay, and features Ioff partial-power-down protection for hot-swap applications.
For engineers reviewing the CY74FCT245TQCT datasheet, CY74FCT245TQCT pinout, CY74FCT245TQCT application, or CY74FCT245TQCT equivalent, key selection criteria include bidirectional bus isolation capability, 3-state control timing (tPZH/tPHZ ≤ 9.5 ns), QSOP-20 thermal performance (θJA = 68°C/W), and compatibility with legacy FCT/F logic families.
Technical Context
The CY74FCT245TQCT implements dual 3-state control via independent OE (output enable) and T/R (transmit/receive) inputs, enabling direction-selectable data flow between A and B ports. Its edge-rate control circuitry reduces switching noise while maintaining matched rise/fall times under load.
It fully complies with TTL input thresholds (VIH = 2 V, VIL = 0.8 V) and provides robust ESD protection (2000-V HBM, 200-V MM, 1000-V CDM). The Ioff feature disables outputs when VCC = 0 V, preventing backflow current during partial power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit noninverting bidirectional transceiver with 3-state outputs |
| Supply Voltage | 4.75–5.25 V - ensures stable operation across industrial-grade 5-V rails |
| Output Drive | 64 mA sink / 32 mA source - sufficient to drive multiple TTL loads or stubbed buses |
| Propagation Delay | 1.5–7 ns (A↔B) - enables high-speed bus arbitration in 25-MHz+ systems |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow during hot-insertion or power sequencing |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets JEDEC JESD22-A114/A115/C101 for board-level reliability |
| Operating Temp | –40°C to +85°C - qualified for commercial/industrial ambient environments |
Pinout & Package
Package: QSOP-20 (DBQ), 0.15 mm pitch, 6.5 mm × 9.0 mm body, 2.65 mm max height, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 inputs/outputs | Port A side of bidirectional data path; connected to local subsystem bus |
| 11, 12, 13, 14, 15, 16, 17, 18 | B0–B7 inputs/outputs | Port B side of bidirectional data path; connected to external or upstream bus |
| 9 | GND | Ground reference for all I/O and internal logic |
| 20 | VCC | 5-V supply input; decoupling capacitor required within 1 cm |
| 10 | T/R | Transmit/Receive control: high = A→B, low = B→A |
| 19 | OE | Output Enable: low = active, high = 3-state (high-impedance) |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) without sacrificing speed - critical for dense PCB layouts |
| Matched rise/fall times | Minimizes duty cycle distortion on clocked or data-strobe signals routed through the device |
| FCT/F logic compatibility | Pin- and function-compatible with CY54FCT245T and standard FCT-family transceivers |
| TTL-level I/O interface | Accepts and drives standard TTL voltage thresholds - eliminates need for level-shifting components |
| Low ICC quiescent current | 0.1–0.2 mA typical - reduces static power in always-on bus isolation stages |
Applications
| Industrial PLC Backplane Interface | Automotive Diagnostic Gateway |
|---|---|
Use Scenario: Isolating CPU-side control logic from field I/O modules across a 20-pin ribbon cable backplane. IC Role / Device Role / Timing Role: Bidirectional data buffer managing read/write cycles between microcontroller and isolated I/O expanders. Use Value: 64-mA drive strength maintains signal integrity over 30-cm traces; Ioff prevents fault current during module hot-swap. | Use Scenario: Bridging UART-based diagnostic commands between vehicle ECU and external OBD-II tool via CAN-to-serial translation layer. IC Role / Device Role / Timing Role: Level-translating and isolating serial data paths between 5-V microcontroller peripherals and legacy diagnostic hardware. Use Value: TTL-compatible thresholds ensure interoperability with older automotive test equipment; 7-ns delay preserves baud-rate timing margins. |
| Legacy System Bus Extender | Embedded Test Fixture Interface |
Use Scenario: Extending a 16-bit ISA-style bus across two PCBs in a modular instrumentation chassis. IC Role / Device Role / Timing Role: Direction-controlled bus repeater enabling synchronous data transfer between master and slave cards. Use Value: Dual 3-state control (OE + T/R) allows precise handshaking; edge-rate control suppresses crosstalk in parallel bus routing. | Use Scenario: Providing programmable signal routing between FPGA-based pattern generator and DUT pins during production test. IC Role / Device Role / Timing Role: Reconfigurable I/O buffer enabling dynamic assignment of stimulus/response channels. Use Value: 3-state outputs allow safe sharing of test nodes; 2000-V HBM rating withstands handling ESD in manufacturing environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT245TSOCT | SOIC-20 package (DW), θJA = 58°C/W, tube packaging (2000 pcs/reel), same electrical specs | Better thermal dissipation; suited for through-hole prototyping or lower-volume production | Select when manual assembly, thermal headroom >10°C, or SOIC footprint is already standardized |
| SN74FCT245CTQCT | Same QSOP-20 package but FCT-C speed grade (4.1 ns max tPLH), 48-mA/12-mA drive | Lower drive strength; optimized for lower-noise, lower-power bus segments | Select when driving fewer loads or prioritizing EMI reduction over maximum fanout |
Compared with CY74FCT245TSOCT and SN74FCT245CTQCT, the CY74FCT245TQCT offers the highest output drive (64/32 mA) in the QSOP-20 form factor, making it optimal for high-fanout, noise-sensitive, or hot-swap-capable bus interfaces where thermal constraints permit θJA = 68°C/W.
Availability
CY74FCT245TQCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive diagnostic gateways, and legacy system bus extenders requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CY74FCT245TQCT 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 connectivity solutions for industrial, automotive, and communications markets.
The CY74FCT245TQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible bus interfacing in mission-critical industrial and automotive control systems.
FAQ
What is the maximum operating temperature range for CY74FCT245TQCT?
The CY74FCT245TQCT is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and applies to the QSOP-20 (DBQ) package variant. Thermal derating is not required within this span, and the device maintains full electrical specifications across the entire range.
Does CY74FCT245TQCT support partial-power-down mode?
Yes, CY74FCT245TQCT supports partial-power-down mode via its Ioff circuitry. When VCC = 0 V, Ioff limits output leakage to ±1 µA even with up to 4.5 V applied at I/O pins, preventing damaging backflow current during hot-swap or staggered power sequencing - a key requirement in modular industrial systems.
What are the key timing parameters for CY74FCT245TQCT directional control?
CY74FCT245TQCT specifies tPZH/tPZL ≤ 9.5 ns (OE/T/R → A/B output disable) and tPHZ/tPLZ ≤ 7.5 ns (OE/T/R → A/B output enable). These values ensure reliable bus arbitration in systems with tight setup/hold windows, such as those using 25-MHz clocked handshaking protocols.
Is CY74FCT245TQCT pin-compatible with CY54FCT245T?
Yes, CY74FCT245TQCT is functionally and pin-compatible with CY54FCT245T in identical packages. Both share identical pinout, logic behavior, and DC characteristics. However, CY54FCT245T is specified for –55°C to +125°C and uses different packaging (CDIP/LCCC), so direct substitution requires verifying temperature and package fit.
What is the meaning of "FCT245" marking on CY74FCT245TQCT top-side?
The top-side marking "FCT245" on CY74FCT245TQCT is the standardized TI part identifier for the base function - an 8-bit FCT-family bidirectional transceiver. It confirms device identity per TI's marking convention and matches ordering information in the official package addendum for CY74FCT245TQCTG4.B.
CY74FCT245TQCT 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:
- Active
- 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
CY74FCT245TQCT FAQ
1.How can I place an order for CY74FCT245TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245TQCT 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 CY74FCT245TQCT reliable?
The price and inventory of CY74FCT245TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT245TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT245TQCT?
CY74FCT245TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245TQCT 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 CY74FCT245TQCT?
For technical support, including CY74FCT245TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245TQCT requirements.
6.How does Aetrix verify that CY74FCT245TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT245TQCT 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 CY74FCT245TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT245TQCT?
All CY74FCT245TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245TQCT, 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 CY74FCT245TQCT part is unused and in its original packaging.
Return procedure for CY74FCT245TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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