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Texas Instruments CY54FCT245CTLMB
- Part No.:
- CY54FCT245CTLMB
- Manufacturer:
- Texas Instruments
- Package:
- 20-CLCC
- Datasheet:
-
CY54FCT245CTLMB.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:2,424
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Product details
Overview
CY54FCT245CTLMB from Texas Instruments is a military-grade 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for high-reliability bus interface applications in aerospace and defense systems. It operates over –55°C to 125°C, delivers 48-mA sink / 12-mA source drive strength, features Ioff partial-power-down support, and uses edge-rate control for improved noise immunity.
For engineers reviewing the CY54FCT245CTLMB datasheet, CY54FCT245CTLMB pinout, CY54FCT245CTLMB application, or CY54FCT245CTLMB equivalent, this page provides verified functional specifications, LCCC-20 package layout, TTL-compatible logic levels, and validated alternatives for radiation-tolerant or extended-temperature system design.
Technical Context
The CY54FCT245CTLMB implements dual-bus bidirectional data flow controlled by independent T/R (transmit/receive) and OE (output enable) inputs. Its logic architecture supports simultaneous A→B or B→A transfer while maintaining high-impedance isolation when OE is high.
It integrates Ioff circuitry to block reverse current during partial power-down, meets MIL-PRF-38535 Class B requirements, and uses edge-rate control to suppress switching noise-critical for mixed-signal avionics and secure comms platforms where signal integrity and thermal resilience are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS buses without level-shifting. |
| Output Drive | 48 mA sink / 12 mA source - Sufficient to drive heavy capacitive loads (e.g., backplanes, long traces) without signal degradation. |
| Propagation Delay | 1.5 ns min / 7.5 ns max - Enables reliable operation up to ~133 MHz bus timing in worst-case temperature conditions. |
| Operating Temperature | –55°C to 125°C - Qualified for deployment in missile guidance, satellite payload, and engine control units. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents damaging backflow when one side of the bus remains powered during hot-swap or staged power sequencing. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets stringent handling and field reliability requirements for deployed military hardware. |
Pinout & Package
LCCC-20 (FK) ceramic package: 8.89 mm × 8.89 mm, 1.27 mm pitch, leadless, hermetically sealed, suitable for high-vacuum and thermal-cycling environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 | Input/output port A - Bidirectional data lines connected to local subsystem (e.g., microcontroller bus). |
| 10, 11, 12, 13, 14, 15, 16, 17 | B0–B7 | Input/output port B - Bidirectional data lines connected to remote bus (e.g., memory or peripheral module). |
| 9 | GND | Ground reference - Primary return path for all I/O and supply currents; must be low-inductance connection. |
| 20 | VCC | Power supply - Requires local 4.5–5.5 V decoupling; sensitive to ripple due to high-speed switching. |
| 18 | T/R | Direction control - High = A→B transfer; Low = B→A transfer; asynchronous, no internal synchronization. |
| 19 | OE | Output enable - High = both A and B ports in high-Z; critical for bus arbitration and multi-drop contention management. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting di/dt, enabling clean signal integrity on dense PCBs with tight spacing. |
| Ioff partial-power-down | Allows safe insertion/removal of CY54FCT245CTLMB into live 5-V buses without disrupting adjacent powered components. |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Interoperates directly with legacy 5-V TTL logic without interface buffers or resistors. |
| Matched rise/fall times | Ensures symmetrical waveform edges, minimizing duty-cycle distortion in clock-forwarding or strobe-based protocols. |
| Hermetic LCCC packaging | Provides moisture resistance, mechanical robustness, and long-term reliability under extreme thermal cycling and vibration stress. |
Applications
| Avionics Data Bus Interface | Military Vehicle Control Network |
|---|---|
Use Scenario: Interfacing a radiation-hardened microcontroller to a MIL-STD-1553B remote terminal controller via isolated 5-V parallel bus. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing command/data handshaking between processor and bus controller. Use Value: Ioff prevents latch-up during power sequencing; edge-rate control suppresses EMI in RF-sensitive cockpit environments. | Use Scenario: Enabling real-time sensor fusion across distributed ECUs in armored vehicle chassis using shared diagnostic bus. IC Role / Device Role / Timing Role: Isolating and buffering CAN gateway logic from engine control unit's noisy 5-V data lines. Use Value: 125°C rating ensures uninterrupted operation near diesel engine compartments; 48-mA drive sustains signal integrity over 30 cm ribbon cable runs. |
| Satellite Payload Telemetry Hub | Tactical Radio Baseband Processing |
Use Scenario: Multiplexing telemetry streams from multiple ADCs and FPGAs onto a centralized downlink interface in LEO satellite payload. IC Role / Device Role / Timing Role: High-reliability bus transceiver routing time-stamped sensor frames between processing modules. Use Value: Hermetic LCCC package withstands vacuum outgassing and thermal shock during launch; –55°C start-up enables cold-orbit initialization. | Use Scenario: Supporting dynamic reconfiguration of baseband I/O between FPGA-based modems and analog front-end ICs in handheld SDR radios. IC Role / Device Role / Timing Role: Reversible data path manager enabling flexible TX/RX channel mapping under software control. Use Value: T/R pin allows runtime direction reversal without firmware overhead; matched rise/fall times preserve symbol timing in QPSK/QAM modulation paths. |
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 | Commercial-grade SSOP-20; 4.1 ns max propagation delay; 0.8–2.0 V input thresholds; RoHS-compliant NiPdAu finish. | Rated only for –40°C to 85°C; not qualified to MIL-PRF-38535; unsuitable for space or high-G environments. | Select when cost, volume production, and commercial temperature range are primary constraints. |
| SN74FCT245CTSOCT | Industrial SOIC-20; 4.1 ns max tPLH/tPHL; 48-mA sink/12-mA source; same logic function but non-hermetic plastic package. | Lacks Ioff specification and military temp rating; lower ESD robustness (1500-V HBM); not screened for burn-in or lot acceptance testing. | Choose for ground-based industrial control where extended temperature and hermeticity are unnecessary. |
Compared with CY74FCT245TQCT and SN74FCT245CTSOCT, the CY54FCT245CTLMB provides guaranteed operation at –55°C and 125°C, hermetic sealing for mission-critical longevity, and MIL-qualified Ioff behavior-making it irreplaceable in flight-critical or space-qualified designs despite higher cost and longer lead times.
Availability
CY54FCT245CTLMB is available at Aetrix Electronics and suitable for avionics data bus interface, military vehicle control network, satellite payload telemetry hub, and tactical radio baseband processing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CY54FCT245CTLMB 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 specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The CY54FCT family was engineered specifically for military and space applications requiring extended temperature operation, hermetic packaging, and rigorous process controls per MIL-PRF-38535 standards.
FAQ
What is the maximum operating temperature for CY54FCT245CTLMB?
The CY54FCT245CTLMB is rated for continuous operation from –55°C to 125°C ambient temperature. This full military temperature range is validated per MIL-PRF-38535 Class B screening and applies to all electrical parameters in the datasheet, including propagation delay, drive strength, and Ioff leakage. The LCCC-20 package contributes to thermal stability through its low-thermal-resistance ceramic construction.
Does CY54FCT245CTLMB support partial-power-down mode?
Yes, CY54FCT245CTLMB includes Ioff circuitry that actively disables outputs when VCC = 0 V, limiting reverse current to ±1 µA even with bus voltages up to 4.5 V applied to I/O pins. This feature enables safe hot-insertion into live backplanes and supports staged power sequencing in multi-rail systems without risk of damage or data corruption.
What package type is used for CY54FCT245CTLMB?
CY54FCT245CTLMB uses an LCCC-20 (Leadless Ceramic Chip Carrier) package designated FK, measuring 8.89 mm × 8.89 mm with 1.27 mm pitch. It is hermetically sealed, unibody ceramic construction with solderable metallized terminations-designed for high-reliability applications demanding moisture resistance, thermal cycling endurance, and mechanical robustness.
How does the T/R pin control data direction in CY54FCT245CTLMB?
In CY54FCT245CTLMB, the T/R (transmit/receive) input is an asynchronous control signal: when T/R = high, data flows from port A to port B; when T/R = low, data flows from port B to port A. Direction change occurs immediately with no internal clock or setup requirement, enabling real-time bus arbitration in deterministic control loops.
Is CY54FCT245CTLMB compatible with standard TTL logic levels?
Yes, CY54FCT245CTLMB is fully compatible with TTL input and output logic levels: VIH = 2.0 V min, VIL = 0.8 V max, VOH ≥ 2.4 V at 12-mA load, VOL ≤ 0.55 V at 48-mA load. This allows direct interfacing with legacy 5-V TTL devices such as 74LS and 74ALS families without level-shifting circuitry or pull-up resistors.
CY54FCT245CTLMB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54FCT
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- 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:
- 12mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
CY54FCT245CTLMB FAQ
1.How can I place an order for CY54FCT245CTLMB through Aetrix?
Please submit a Request for Quotation (RFQ) for CY54FCT245CTLMB 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 CY54FCT245CTLMB reliable?
The price and inventory of CY54FCT245CTLMB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY54FCT245CTLMB is usually 5 days.
3.What payment methods are accepted for CY54FCT245CTLMB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY54FCT245CTLMB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY54FCT245CTLMB?
CY54FCT245CTLMB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY54FCT245CTLMB 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 CY54FCT245CTLMB?
For technical support, including CY54FCT245CTLMB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY54FCT245CTLMB requirements.
6.How does Aetrix verify that CY54FCT245CTLMB is sourced from the original manufacturer or authorized distributors?
All CY54FCT245CTLMB 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 CY54FCT245CTLMB meets industry standards.
7.What is the process for return or replacement of CY54FCT245CTLMB?
All CY54FCT245CTLMB units undergo pre-shipment inspection (PSI). If there is an issue with CY54FCT245CTLMB, 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 CY54FCT245CTLMB part is unused and in its original packaging.
Return procedure for CY54FCT245CTLMB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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