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Texas Instruments CY74FCT245TSOC
- Part No.:
- CY74FCT245TSOC
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT245TSOC.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,487
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Product details
Overview
CY74FCT245TSOC from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data transfer between two TTL-compatible buses. It features 64-mA sink / 32-mA source drive strength, 7 ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and edge-rate control for noise reduction. Used in industrial backplane interfaces and legacy system bus isolation.
For engineers reviewing the CY74FCT245TSOC datasheet, CY74FCT245TSOC pinout, CY74FCT245TSOC application, or CY74FCT245TSOC equivalent, key selection criteria include bidirectional direction control via T/R input, OE-gated 3-state output disable, SOIC-20 package compatibility, and 4.5 V to 5.5 V supply operation with TTL-level I/O.
Technical Context
The CY74FCT245TSOC implements dual-bus bidirectional buffering using a single transmit/receive (T/R) control line to determine data flow direction (A→B or B→A), while output enable (OE) independently places both A and B ports into high-impedance state. Its FCT logic family ensures function, pinout, and drive compatibility with industry-standard FCT and F-series transceivers.
It integrates edge-rate control circuitry to reduce switching noise and ESD protection exceeding JESD22 standards (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 - critical for hot-swap and mixed-voltage system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT - fully TTL-input/output compatible with 5 V supply, no level-shifting required |
| Propagation Delay | 7 ns max (tPLH/tPHL at VCC = 5 V) - supports 100+ MHz bus timing in short-trace applications |
| Drive Strength | 64 mA sink / 32 mA source per output - drives heavy capacitive loads and multiple TTL inputs |
| Ioff Support | Active at VCC = 0 V - enables safe partial-power-down without bus contention or latch-up risk |
| Supply Voltage | 4.5 V to 5.5 V - operates across full industrial 5 V rail tolerance with margin for ripple |
| ESD Rating | 2000-V HBM - exceeds JEDEC JESD22-A114A, suitable for handling in non-ESD-controlled environments |
| Operating Temp | –40°C to +85°C - qualified for industrial ambient conditions without derating |
Pinout & Package
Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19–20 | A0–A7 | Input/output port A - connects to local bus or microcontroller data lines |
| 2–9 | B0–B7 | Input/output port B - connects to remote bus, peripheral, or memory subsystem |
| 10 | GND | Ground reference - must be low-impedance connection to minimize ground bounce |
| 11 | VCC | 5 V power supply - requires local 0.1 µF ceramic decoupling adjacent to pin |
| 12 | OE | Output enable (active low) - asserts high-impedance on both A and B ports when high |
| 13 | T/R | Transmit/receive control (active high) - selects A→B (high) or B→A (low) data flow |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus interface | Single T/R pin controls real-time direction reversal without external logic or timing constraints |
| Edge-rate controlled outputs | Slower rise/fall times reduce simultaneous switching noise (SSN) and EMI in dense PCB layouts |
| Matched tPLH/tPHL | Ensures symmetrical timing margins for both directions - simplifies timing analysis in full-duplex links |
| 3-state output disable | OE-driven high-Z state isolates both ports simultaneously - prevents bus conflicts during reset or standby |
| Partial-power-down Ioff | Blocks current flow when VCC = 0 V - enables live insertion/removal in modular backplane systems |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Interfacing a modern controller module to an older ISA or VME bus segment with strict voltage and timing requirements. IC Role / Device Role / Timing Role: Bidirectional level-consistent buffer that translates control/data signals while maintaining TTL-compatible VOH/VOL and propagation delay. Use Value: Eliminates need for discrete level shifters or glue logic; preserves signal integrity across long traces with edge-rate control. | Use Scenario: Isolating CPU address/data bus from expansion slot peripherals to prevent loading and contention during hot-plug events. IC Role / Device Role / Timing Role: Directionally controllable transceiver enabling dynamic bus ownership handoff under software control. Use Value: Ioff support allows safe power cycling of peripheral modules without disrupting main CPU bus operation. |
| Microcontroller Peripheral Expansion | Test Equipment Signal Routing |
Use Scenario: Extending GPIO count of an MCU by connecting parallel peripherals (e.g., LCD, keypad, ADC) via shared data bus. IC Role / Device Role / Timing Role: 3-state-enabled bidirectional data path allowing MCU to read from or write to peripherals using same pins. Use Value: Reduces MCU pin count requirement; 64-mA drive supports direct LED or relay driver interfacing without buffers. | Use Scenario: Reconfigurable signal routing matrix in automated test equipment where DUT I/O must be dynamically connected to measurement instruments. IC Role / Device Role / Timing Role: Electrically isolated bidirectional switch enabling instrument-to-DUT or DUT-to-DUT communication paths. Use Value: OE and T/R pins allow deterministic path setup/teardown in <10 ns - critical for synchronized test sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT245CTSOCT | Same SOIC-20 package, but 4.1 ns max propagation delay and 48-mA/12-mA drive (CY54FCT245T speed grade) | Lower drive and faster timing - suited for lower-capacitance, high-speed interconnects where fanout is limited | Select when reduced propagation delay is prioritized over drive strength and noise immunity |
| 74ACT245SCX | ACT family, 5 V only, 7.5 ns max tPLH, 24 mA/24 mA drive, no Ioff, no edge-rate control | Lacks Ioff and edge-rate features - unsuitable for partial-power-down or noise-sensitive environments | Choose only in cost-sensitive, static-power applications where full system power cycling is guaranteed |
Compared with SN74FCT245CTSOCT and 74ACT245SCX, CY74FCT245TSOC delivers higher drive capability and integrated Ioff/edge-rate features essential for robust industrial bus interfacing - making it the preferred choice where reliability under mixed-power conditions and EMI control are mandatory.
Availability
CY74FCT245TSOC is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, and microcontroller peripheral expansion requiring stable component supply and long-term lifecycle support.
Supply support for CY74FCT245TSOC 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 with emphasis on reliability, longevity, and industrial-grade qualification.
The CY74FCT245TSOC belongs to TI's FCT logic family, engineered for robust 5 V bus interfacing in industrial, telecom, and computing infrastructure where noise immunity, power-down safety, and TTL compatibility are critical.
FAQ
What is the maximum propagation delay of the CY74FCT245TSOC at 5 V?
The CY74FCT245TSOC has a maximum propagation delay (tPLH/tPHL) of 7 ns when operating at VCC = 5 V and TA = 25°C, as specified in the switching characteristics table for the CY74FCT245T speed grade. This value applies across the full industrial temperature range (–40°C to +85°C) with appropriate derating per datasheet guidelines.
Does the CY74FCT245TSOC support partial power-down operation?
Yes, the CY74FCT245TSOC supports partial power-down via its Ioff circuitry. When VCC = 0 V, the Ioff feature disables all outputs and limits leakage current to ±1 µA even if bus voltages up to 4.5 V are present - preventing damaging backflow current and enabling safe hot-swap in modular systems.
What is the output drive capability of the CY74FCT245TSOC?
The CY74FCT245TSOC provides 64-mA sink current and 32-mA source current per output at VCC = 5 V. This drive strength allows direct interfacing with multiple TTL loads or moderate capacitive buses without external buffers, distinguishing it from lower-drive variants like the CY54FCT245T (48-mA/12-mA).
Is the CY74FCT245TSOC pin-compatible with other FCT245 devices?
Yes, the CY74FCT245TSOC is functionally and physically pin-compatible with all CY74FCT245x variants in SOIC-20 (DW) packaging, including CY74FCT245ATSOCT and CY74FCT245CTSOC. Pin assignments, electrical behavior, and thermal characteristics match across this package group - enabling drop-in replacement within the same speed and drive grade.
What package type and RoHS status does the CY74FCT245TSOC use?
The CY74FCT245TSOC uses a SOIC-20 (DW) package with 1.27 mm pitch, 7.5 mm × 12.8 mm footprint, and 2.65 mm max height. It is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating (unlimited floor life), verified per TI's official packaging addendum dated July 2026.
CY74FCT245TSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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-SOIC
CY74FCT245TSOC FAQ
1.How can I place an order for CY74FCT245TSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245TSOC 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 CY74FCT245TSOC reliable?
The price and inventory of CY74FCT245TSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245TSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT245TSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245TSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT245TSOC?
CY74FCT245TSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245TSOC 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 CY74FCT245TSOC?
For technical support, including CY74FCT245TSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245TSOC requirements.
6.How does Aetrix verify that CY74FCT245TSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT245TSOC 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 CY74FCT245TSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT245TSOC?
All CY74FCT245TSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245TSOC, 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 CY74FCT245TSOC part is unused and in its original packaging.
Return procedure for CY74FCT245TSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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