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Texas Instruments CY74FCT245DTQCTE4
- Part No.:
- CY74FCT245DTQCTE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT245DTQCTE4.pdf
- Description:
- IC TRANSCVR TRI-ST 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
CY74FCT245DTQCTE4 from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data transfer between asynchronous logic domains. It features 64-mA sink / 32-mA source drive strength, 3.8-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output voltage levels. It is used in industrial backplane interfaces requiring robust noise immunity and direction-controlled data flow.
For engineers reviewing the CY74FCT245DTQCTE4 datasheet, CY74FCT245DTQCTE4 pinout, CY74FCT245DTQCTE4 application, or CY74FCT245DTQCTE4 equivalent, key selection criteria include bidirectional bus isolation capability, 3.8 ns speed grade, QSOP-20 package thermal performance (θJA = 68°C/W), and Ioff-enabled safe power sequencing in mixed-voltage systems.
Technical Context
The CY74FCT245DTQCTE4 implements edge-rate controlled output drivers to reduce simultaneous switching noise (SSN) and improve signal integrity in high-density PCB layouts. Its T/R input selects data direction (A→B or B→A), while OE enables/disables both ports into high-impedance state - supporting hot-swap and bus-sharing configurations.
It integrates Ioff circuitry that disables outputs when VCC = 0 V, preventing reverse current flow during partial power-down. Fully specified over –40°C to +85°C, it operates at VCC = 4.75–5.25 V and maintains TTL-compatible VIH/VIL thresholds (2.0 V/0.8 V) and VOH/VOL (≥2.4 V / ≤0.55 V at IOL = 64 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit noninverting bidirectional transceiver with 3-state outputs |
| Propagation Delay | 3.8 ns max (tPLH/tPHL, A↔B), enabling 263 MHz bus operation under ideal conditions |
| Drive Strength | 64 mA sink / 32 mA source per output, sufficient for driving 50-pF loads across 15-cm traces |
| Ioff Support | Active at VCC = 0 V; limits reverse current to ±1 µA, enabling safe power sequencing in multi-rail systems |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial handling requirements without external protection |
| Supply Range | 4.75 V to 5.25 V - compatible with regulated 5-V rails and rejects ±2.5% line variation |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including factory automation controllers |
Pinout & Package
Package: 20-pin QSOP (DBQ), 0.635-mm pitch, 7.2-mm width, 2.65-mm max height, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19–20 | A0–A7 | Input/output port A - connects to local subsystem (e.g., microcontroller data bus) |
| 2–9 | B0–B7 | Input/output port B - connects to remote bus (e.g., peripheral expansion slot) |
| 10 | GND | Power ground reference - must be low-inductance connection to minimize ground bounce |
| 11 | VCC | 5-V supply - requires local 0.1-µF ceramic decoupling adjacent to pin |
| 12 | OE | Output enable (active low) - disables both A and B ports simultaneously into high-Z state |
| 13 | T/R | Transmit/receive control (active high) - determines direction: A→B when high, B→A when low |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate control | Slows output transitions to reduce EMI and crosstalk in dense routing, meeting Class B FCC emissions without added filtering |
| Matched rise/fall times | Ensures symmetrical waveform edges (<1 ns skew), minimizing duty-cycle distortion on clock-forwarding applications |
| TTL-compatible I/O | Accepts standard TTL VIH (2.0 V min) and drives VOH ≥2.4 V at 32 mA - interoperable with legacy 74LS/ALS logic |
| High noise immunity | Input hysteresis (Vhys = 0.2 V) rejects <200-mV rail noise, critical in electrically noisy PLC cabinets |
| Low ICC quiescent current | 0.1–0.2 mA typical - reduces standby power in always-on industrial gateways |
Applications
| Industrial Backplane Interface | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating CPU data bus from modular I/O carrier board in programmable logic controller chassis. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing A/B port arbitration via T/R and OE signals. Use Value: Enables hot-plug of I/O modules without disrupting main CPU bus; Ioff prevents backfeed during module insertion/removal. | Use Scenario: Extending 8-bit parallel interface from ARM Cortex-M4 MCU to external SRAM and FPGA configuration memory. IC Role / Device Role / Timing Role: Direction-controlled data path synchronizing burst reads/writes between MCU and external memory banks. Use Value: 3.8-ns propagation delay supports 263-MHz effective throughput; matched tPLH/tPHL ensures timing margin for 100-MHz bus clocks. |
| Legacy System Interfacing | Test Equipment Data Capture |
Use Scenario: Bridging modern FPGA-based controller to legacy 74LS-based instrumentation bus in calibration lab equipment. IC Role / Device Role / Timing Role: TTL-compatible transceiver translating logic levels and driving 50-pF bus capacitance with full 64-mA sink capability. Use Value: Eliminates need for discrete level-shifters; edge-rate control suppresses ringing on long ribbon cables (>30 cm). | Use Scenario: Capturing parallel digital stimulus/response waveforms in automated test fixture with real-time pattern analysis. IC Role / Device Role / Timing Role: High-speed bidirectional buffer isolating DUT data lines from acquisition logic during active sampling. Use Value: 3-state outputs allow shared bus access between multiple test instruments; 2000-V HBM ESD rating withstands repeated probe contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT245ATQCT | Same FCT family, identical pinout and AC specs, but rated for –40°C to +85°C only (no extended temp variant) | Identical use in commercial/industrial bus interfaces; lacks MIL-PRF-38535 qualification path | Select when full military screening is unnecessary and cost optimization is prioritized |
| 74ACT245SCX | ACT logic family: higher VOH (≥4.4 V), lower IOL (24 mA), no Ioff, 5.5-V absolute max VCC | Suitable for 5-V-only systems with lighter bus loading; not safe for partial-power-down sequencing | Choose only if system guarantees simultaneous VCC ramp-up/down across all rails |
Compared with SN74FCT245ATQCT and 74ACT245SCX, the CY74FCT245DTQCTE4 provides superior bus drive (64 mA sink), guaranteed Ioff behavior for power sequencing, and tighter propagation delay (3.8 ns vs. 4.6 ns), making it optimal for high-reliability industrial backplanes.
Availability
CY74FCT245DTQCTE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, legacy system interfacing, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for CY74FCT245DTQCTE4 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 CY74FCT245DTQCTE4 belongs to TI's FCT logic family, engineered for high-speed, low-noise bus interfacing in industrial control and instrumentation systems where reliability under electrical stress and thermal variation is critical.
FAQ
What is the maximum operating frequency supported by the CY74FCT245DTQCTE4?
The CY74FCT245DTQCTE4 has a maximum propagation delay of 3.8 ns (tPLH/tPHL), supporting reliable data transfer up to 263 MHz in ideal conditions. Actual achievable frequency depends on load capacitance, trace length, and termination - for 50-pF loads and proper layout, sustained 100-MHz bus operation is verified per datasheet timing margins.
Does the CY74FCT245DTQCTE4 support partial power-down operation?
Yes, the CY74FCT245DTQCTE4 includes Ioff circuitry that actively disables outputs when VCC = 0 V, limiting reverse current to ±1 µA. This allows safe insertion/removal in live backplanes and enables independent power cycling of subsystems without damaging the device or corrupting bus states.
What is the purpose of the T/R and OE pins on the CY74FCT245DTQCTE4?
The T/R (transmit/receive) pin controls data direction: high enables A→B flow, low enables B→A flow. The OE (output enable) pin, active low, places both A and B ports into high-impedance state when asserted. Together, they provide precise bus arbitration - e.g., OE = high + T/R = high isolates B-side while allowing A-side read/write.
Can the CY74FCT245DTQCTE4 interface directly with 3.3-V logic devices?
No - the CY74FCT245DTQCTE4 is a 5-V-only device (VCC = 4.75–5.25 V) with TTL-compatible inputs (VIH = 2.0 V min) but outputs VOH ≥2.4 V at 32 mA. Direct connection to 3.3-V CMOS inputs risks overvoltage damage; a level-shifter or series resistor + clamping diode network is required for safe interfacing.
Is the CY74FCT245DTQCTE4 RoHS compliant and lead-free?
Yes, the CY74FCT245DTQCTE4 is RoHS compliant with NiPdAu (NIPDAU) lead finish, per TI's Package Option Addendum. It meets JEDEC Level-2-260°C-1-year MSL rating and is supplied in tape-and-reel packaging (2500 units/reel) with Q1 pin-1 orientation.
CY74FCT245DTQCTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- -
- 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
CY74FCT245DTQCTE4 FAQ
1.How can I place an order for CY74FCT245DTQCTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245DTQCTE4 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 CY74FCT245DTQCTE4 reliable?
The price and inventory of CY74FCT245DTQCTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245DTQCTE4 is usually 5 days.
3.What payment methods are accepted for CY74FCT245DTQCTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245DTQCTE4 transactions.
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4.How is shipping managed for CY74FCT245DTQCTE4?
CY74FCT245DTQCTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245DTQCTE4 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 CY74FCT245DTQCTE4?
For technical support, including CY74FCT245DTQCTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245DTQCTE4 requirements.
6.How does Aetrix verify that CY74FCT245DTQCTE4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT245DTQCTE4 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 CY74FCT245DTQCTE4 meets industry standards.
7.What is the process for return or replacement of CY74FCT245DTQCTE4?
All CY74FCT245DTQCTE4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245DTQCTE4, 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 CY74FCT245DTQCTE4 part is unused and in its original packaging.
Return procedure for CY74FCT245DTQCTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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