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Texas Instruments CY54FCT245TLMB
- Part No.:
- CY54FCT245TLMB
- Manufacturer:
- Texas Instruments
- Package:
- 20-CLCC
- Datasheet:
-
CY54FCT245TLMB.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:1,316
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Product details
Overview
CY54FCT245TLMB from Texas Instruments is a military-grade 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data routing in high-reliability systems. It features ±1 µA Ioff support for partial-power-down operation, 48-mA sink / 12-mA source drive capability, and operates across –55°C to 125°C. It is used in avionics backplane interfaces requiring TTL-compatible level translation and controlled bus isolation.
For engineers reviewing the CY54FCT245TLMB datasheet, CY54FCT245TLMB pinout, CY54FCT245TLMB application, or CY54FCT245TLMB equivalent, key selection criteria include its LCCC-20 package, Ioff-enabled power-down safety, 7.5 ns max propagation delay (tPLH/tPHL), and compatibility with FCT/F logic families in harsh-environment designs.
Technical Context
The CY54FCT245TLMB implements dual-bus bidirectional data flow controlled by independent T/R (transmit/receive) and OE (output enable) inputs. Its edge-rate control circuitry reduces switching noise, while matched rise/fall times ensure clean signal integrity on shared buses.
It supports full TTL input/output voltage compatibility (VIH = 2 V min, VOL = 0.55 V max at 48 mA), operates at VCC = 4.5–5.5 V, and includes JESD22-certified ESD protection (2000-V HBM, 200-V MM, 1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across wide supply tolerance in military power rails. |
| Max Propagation Delay | 7.5 ns - Enables reliable 133+ MHz bus timing in synchronous backplane applications. |
| Output Sink/Source | 48 mA / 12 mA - Drives heavy capacitive loads (e.g., >100 pF traces or multiple TTL inputs) without signal degradation. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents damaging backflow current during hot-swap or staged power sequencing. |
| Operating Temp | –55°C to +125°C - Qualified for extended-range military and aerospace platforms per MIL-PRF-38535. |
| ESD Rating | 2000-V HBM - Meets stringent handling requirements for field-deployable electronics assembly. |
Pinout & Package
LCCC-20 (FK) ceramic package: 8.89 mm × 8.89 mm, 1.27 mm pitch, leadless, hermetically sealed, suitable for high-vibration and high-reliability PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Input/Output port A | Bidirectional data lane for local bus side; driven high-impedance when OE = high. |
| B0–B7 | Input/Output port B | Bidirectional data lane for remote bus side; direction set by T/R state. |
| T/R | Direction control | High = A→B transfer; Low = B→A transfer; critical for half-duplex bus arbitration. |
| OE | Output enable | High = both ports in high-Z; enables bus sharing among multiple transceivers. |
| VCC | Power supply | 5 V nominal supply; decoupling required within 10 mm due to fast edge rates. |
| GND | Ground reference | Common return for all I/O and supply currents; requires low-inductance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate control | Reduces simultaneous switching noise (SSN) by limiting dv/dt, improving signal integrity on dense backplanes. |
| Ioff partial-power-down | Allows safe insertion/removal while system remains powered; prevents latch-up or bus contention during maintenance. |
| FCT/F logic compatibility | Pin- and function-compatible with industry-standard 74FCT245 variants, enabling drop-in replacement in legacy designs. |
| Matched rise/fall times | Minimizes duty-cycle distortion on clocked data paths, preserving setup/hold margins in synchronous transfers. |
Applications
| Avionics Data Bus Interface | Secure Ground Station Backplane |
|---|---|
Use Scenario: Bidirectional data exchange between flight computer and sensor acquisition modules over MIL-STD-1553 auxiliary bus lines. IC Role / Device Role / Timing Role: Level-shifting transceiver isolating processor-side TTL logic from ruggedized bus drivers while maintaining timing alignment. Use Value: 7.5 ns max propagation delay ensures deterministic latency under worst-case temperature and voltage conditions. | Use Scenario: Interfacing encrypted comms processors with RF front-end FPGAs in hardened ground station chassis. IC Role / Device Role / Timing Role: Bus arbitrator enabling time-shared access to shared memory and DMA channels across security domains. Use Value: Ioff support allows safe hot-swap of processor cards without powering down entire backplane. |
| Tactical Vehicle Control System | Radiation-Hardened Telemetry Hub |
Use Scenario: Real-time CAN-to-TTL protocol bridging between engine control unit and dashboard display controller in armored vehicle ECUs. IC Role / Device Role / Timing Role: Direction-controlled data conduit synchronizing status updates and command acknowledgments across isolated voltage domains. Use Value: 48-mA sink current drives long harness runs with minimal voltage droop, ensuring robust signal reception. | Use Scenario: Multiplexing telemetry streams from radiation-monitoring sensors into a central FPGA-based aggregator in satellite payload subsystems. IC Role / Device Role / Timing Role: Radiation-tolerant bus buffer providing fault-isolated data path between analog front-end and digital processing chain. Use Value: –55°C to +125°C operation sustains functionality during orbital thermal cycling without derating. |
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; 3.8 ns max tPLH; VCC = 4.75–5.25 V; RoHS-compliant NiPdAu finish. | Rated for –40°C to +85°C only; intended for industrial control panels, not extended-temp deployments. | Select when cost-sensitive volume production and surface-mount assembly are priorities over military temp range. |
| SN74FCT245CTSOCT | SOIC-20; 4.1 ns max tPLH; same VCC range as CY54FCT245TLMB but lower ESD rating (1500-V HBM). | Lacks MIL-PRF-38535 qualification; not approved for flight-critical or defense prime contracts. | Choose for commercial avionics subsystems where full military screening is unnecessary but 5-V TTL compatibility is required. |
Compared with CY74FCT245TQCT and SN74FCT245CTSOCT, the CY54FCT245TLMB provides guaranteed operation at –55°C and +125°C, hermetic LCCC packaging for moisture resistance, and higher ESD robustness-making it the sole option qualified for deployed military hardware where environmental resilience is non-negotiable.
Availability
CY54FCT245TLMB is available at Aetrix Electronics and suitable for avionics data bus interfaces, secure ground station backplanes, tactical vehicle control systems, and radiation-hardened telemetry hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY54FCT245TLMB 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 delivers military-qualified 5-V TTL-compatible logic devices engineered for mission-critical systems demanding extended temperature operation, hermetic packaging, and rigorous process controls per MIL-PRF-38535.
FAQ
What is the maximum operating temperature range for CY54FCT245TLMB?
The CY54FCT245TLMB is rated for continuous operation from –55°C to +125°C, fully qualified per MIL-PRF-38535 for use in extreme-environment applications such as airborne and spaceborne electronics where thermal cycling reliability is mandatory. This range is confirmed in the device's recommended operating conditions table and absolute maximum ratings section.
Does CY54FCT245TLMB support partial-power-down mode?
Yes, CY54FCT245TLMB includes Ioff circuitry that disables outputs and limits leakage to ±1 µA when VCC = 0 V, enabling safe partial-power-down operation. This feature prevents damaging current backflow during hot-swap events or staged power sequencing-critical in modular avionics and ground station architectures.
What package type is used for CY54FCT245TLMB?
CY54FCT245TLMB uses an LCCC-20 (FK) package: an 8.89 mm × 8.89 mm leadless ceramic chip carrier with 1.27 mm pitch, hermetically sealed, and qualified for high-reliability military applications. Its dimensions, land pattern, and thermal characteristics are documented in TI's DWG #4220724/A.
How does CY54FCT245TLMB differ from CY74FCT245T variants?
CY54FCT245TLMB is the military-grade version with –55°C to +125°C operation, LCCC packaging, and MIL-PRF-38535 qualification, whereas CY74FCT245T variants are commercial-grade (–40°C to +85°C), offered in SOIC/SSOP/CDIP packages, and lack hermetic sealing or extended-temp screening. Electrical specs like drive strength and propagation delay also differ by speed grade.
Is CY54FCT245TLMB pin-compatible with standard 74FCT245 devices?
Yes, CY54FCT245TLMB is functionally and pin-compatible with industry-standard 74FCT245 transceivers-including CY74FCT245T and SN74FCT245C-supporting direct replacement in existing layouts. Its LCCC-20 footprint matches the 20-pin leadless configuration defined in JEDEC MO-047, preserving mechanical and electrical interface integrity.
CY54FCT245TLMB 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)
CY54FCT245TLMB FAQ
1.How can I place an order for CY54FCT245TLMB through Aetrix?
Please submit a Request for Quotation (RFQ) for CY54FCT245TLMB 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 CY54FCT245TLMB reliable?
The price and inventory of CY54FCT245TLMB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY54FCT245TLMB is usually 5 days.
3.What payment methods are accepted for CY54FCT245TLMB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY54FCT245TLMB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY54FCT245TLMB?
CY54FCT245TLMB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY54FCT245TLMB 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 CY54FCT245TLMB?
For technical support, including CY54FCT245TLMB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY54FCT245TLMB requirements.
6.How does Aetrix verify that CY54FCT245TLMB is sourced from the original manufacturer or authorized distributors?
All CY54FCT245TLMB 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 CY54FCT245TLMB meets industry standards.
7.What is the process for return or replacement of CY54FCT245TLMB?
All CY54FCT245TLMB units undergo pre-shipment inspection (PSI). If there is an issue with CY54FCT245TLMB, 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 CY54FCT245TLMB part is unused and in its original packaging.
Return procedure for CY54FCT245TLMB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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