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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments CY74FCT2245TSOCT

Name: CY74FCT2245TSOCT
Brand: Texas Instruments
SKU: CY74FCT2245TSOCT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY74FCT2245TSOCT

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: CY74FCT2245TSOCT.pdf

Description:: IC TXRX NON-INVERT 5.25V 20SOIC

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Product details

Overview

CY74FCT2245TSOCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus interface applications. It features 25-Ω output series resistors, I_off partial-power-down support, 12 mA sink / 15 mA source drive, and TTL-compatible logic levels. It operates across –40°C to 85°C in SOIC-20 package and replaces CY74FCT245T in noise-sensitive bus systems.

For engineers reviewing the CY74FCT2245TSOCT datasheet, CY74FCT2245TSOCT pinout, CY74FCT2245TSOCT application, or CY74FCT2245TSOCT equivalent, key selection criteria include bidirectional bus timing (t_PLH/t_PHL ≤ 7 ns), 3-state enable/disable performance (t_PZH/t_PZL ≤ 9.5 ns), I_off protection for hot-swap scenarios, and 25-Ω on-die termination for reflection suppression on PCB traces.

Technical Context

The CY74FCT2245TSOCT implements a dual-port bidirectional buffer architecture controlled by independent T/R (transmit/receive) and OE (output enable) inputs. Its edge-rate control circuitry shapes output transitions to reduce EMI, while integrated 25-Ω series resistors dampen transmission-line reflections without external components.

It supports partial-power-down via I_off, disabling outputs when V_CC = 0 V to prevent backflow current. Input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and output drive (V_OL ≤ 0.55 V at 12 mA, V_OH ≥ 2.4 V at –15 mA) ensure full TTL compatibility and robust noise immunity in mixed-voltage systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.75 V to 5.25 V - Ensures stable operation under standard 5-V supply tolerances.
Propagation Delay	t_PLH/t_PHL ≤ 7 ns - Enables high-speed data transfer between A and B ports in bus arbitration.
Output Drive	12 mA sink / 15 mA source - Sustains logic levels driving multiple TTL loads or unterminated stubs.
On-Die Termination	25 Ω series resistance - Eliminates need for external series resistors, reducing BOM count and layout area.
I_off Current	±1 µA at V_CC = 0 V - Blocks damaging back-current during live insertion or power sequencing.
ESD Protection	2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade reliability requirements without external protection.
Operating Temperature	–40°C to +85°C - Qualified for extended industrial environments including motor control and PLC backplanes.

Pinout & Package

SOIC-20 package (DW), 7.6 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1 (T/R)	Direction control input	High = A→B data flow; Low = B→A data flow - Enables dynamic bus arbitration without external logic.
2–9 (A0–A7)	Port A bidirectional I/O	Connects to local processor or controller bus - Supports simultaneous read/write with OE and T/R coordination.
10 (GND)	Ground reference	Primary return path for all I/O and internal logic - Requires low-inductance connection to minimize ground bounce.
11 (V_CC)	Power supply	5-V nominal supply with 4.75–5.25 V range - Must be decoupled with 0.1 µF ceramic near pin 11.
12 (OE)	Output enable input	High = high-impedance state on both A and B ports - Allows shared bus contention-free release.
13–20 (B0–B7)	Port B bidirectional I/O	Connects to peripheral or memory bus - Matches A-port timing and drive strength for symmetrical bidirectional signaling.

Key Features

Feature	Design Value
Integrated 25-Ω output series resistors	Reduces PCB trace reflections without discrete resistors, cutting layout complexity and signal integrity risk.
Edge-rate controlled outputs	Slows rise/fall times just enough to suppress ringing while maintaining 7 ns propagation - no external RC tuning needed.
I_off partial-power-down protection	Prevents reverse current flow when V_CC is off, enabling safe hot-plug operation in modular backplane systems.
TTL-compatible input/output thresholds	V_IL ≤ 0.8 V and V_OH ≥ 2.4 V guarantee interoperability with legacy 74LS/74ALS and modern FCT-family logic.
3-state bus hold capability	OE-controlled high-Z on both ports allows seamless integration into multi-driver shared-bus architectures.

Applications

Industrial Backplane Bus Interface	Embedded Controller Expansion Port
Use Scenario: Interfacing a microcontroller unit (MCU) to a multi-slot industrial backplane carrying sensor and actuator data. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between MCU local bus and backplane bus under real-time arbitration. Use Value: On-die 25-Ω termination eliminates stub reflections across 15-cm backplane traces, preserving signal integrity at 20 MHz burst rates.	Use Scenario: Expanding GPIO and address/data lines from an ARM-based SoC to peripheral modules (ADC, DAC, display driver). IC Role / Device Role / Timing Role: 8-bit bidirectional buffer enabling flexible read/write access to expansion peripherals via shared address/data bus. Use Value: 7 ns propagation delay and 9.5 ns disable time allow tight timing margins in 50-MHz synchronous peripheral interfaces.
Hot-Swappable Module Interface	Noise-Sensitive Test Equipment Bus
Use Scenario: Supporting live insertion/removal of field-replaceable units (FRUs) in telecom line cards without powering down the main system. IC Role / Device Role / Timing Role: Isolation transceiver enforcing I_off-protected high-Z state during module power-off transitions. Use Value: ±1 µA I_off prevents backfeed damage to powered host logic, meeting Telcordia GR-63-CORE safety requirements.	Use Scenario: Connecting precision analog front-end ICs to digital control logic in automated test equipment (ATE) where EMI must be minimized. IC Role / Device Role / Timing Role: Low-noise bidirectional data bridge isolating sensitive analog sections from noisy digital switching domains. Use Value: Edge-rate control + 25-Ω termination reduces broadband noise emissions by >12 dB compared to standard 74F245 implementations.

Industrial Backplane Bus Interface

Embedded Controller Expansion Port

Use Scenario: Interfacing a microcontroller unit (MCU) to a multi-slot industrial backplane carrying sensor and actuator data.

IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between MCU local bus and backplane bus under real-time arbitration.

Use Value: On-die 25-Ω termination eliminates stub reflections across 15-cm backplane traces, preserving signal integrity at 20 MHz burst rates.

Use Scenario: Expanding GPIO and address/data lines from an ARM-based SoC to peripheral modules (ADC, DAC, display driver).

IC Role / Device Role / Timing Role: 8-bit bidirectional buffer enabling flexible read/write access to expansion peripherals via shared address/data bus.

Use Value: 7 ns propagation delay and 9.5 ns disable time allow tight timing margins in 50-MHz synchronous peripheral interfaces.

Hot-Swappable Module Interface

Noise-Sensitive Test Equipment Bus

Use Scenario: Supporting live insertion/removal of field-replaceable units (FRUs) in telecom line cards without powering down the main system.

IC Role / Device Role / Timing Role: Isolation transceiver enforcing I_off-protected high-Z state during module power-off transitions.

Use Value: ±1 µA I_off prevents backfeed damage to powered host logic, meeting Telcordia GR-63-CORE safety requirements.

Use Scenario: Connecting precision analog front-end ICs to digital control logic in automated test equipment (ATE) where EMI must be minimized.

IC Role / Device Role / Timing Role: Low-noise bidirectional data bridge isolating sensitive analog sections from noisy digital switching domains.

Use Value: Edge-rate control + 25-Ω termination reduces broadband noise emissions by >12 dB compared to standard 74F245 implementations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74FCT245ATSOCT	Higher speed: t_PLH/t_PHL ≤ 4.6 ns; no integrated 25-Ω resistors.	Requires external series termination for reflection control; better suited for short, well-matched traces.	Select when maximum speed is critical and board layout allows discrete termination.
74LCX245MTCX	Lower voltage: 2.0–3.6 V operation; 24 mA drive; no I_off or on-die termination.	Designed for 3.3-V mixed-signal systems; lacks hot-swap protection and reflection damping.	Select for 3.3-V domains where power efficiency outweighs noise immunity needs.

Compared with SN74FCT245ATSOCT and 74LCX245MTCX, the CY74FCT2245TSOCT uniquely combines on-die 25-Ω termination, I_off protection, and industrial temperature range in a single 5-V device-making it optimal for noise-prone, hot-pluggable, or legacy-TTL bus designs where layout simplification and robustness are prioritized over raw speed or low-voltage operation.

Availability

CY74FCT2245TSOCT is available at Aetrix Electronics and suitable for industrial backplanes, embedded controller expansion, hot-swappable modules, and noise-sensitive test equipment requiring stable component supply and long-term obsolescence management.

Supply support for CY74FCT2245TSOCT 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 CY74FCT2245TSOCT belongs to TI's FCT logic family, engineered specifically for high-noise-immunity, bus-oriented applications in industrial control and legacy-system upgrades where TTL compatibility and signal integrity are critical.

FAQ

What is the maximum clock/data rate supported by CY74FCT2245TSOCT?

The CY74FCT2245TSOCT does not operate on a clock; it is an asynchronous transceiver. Its 7 ns maximum propagation delay supports reliable data handshaking up to approximately 70 MHz in well-terminated systems. Actual usable rate depends on bus loading, trace length, and noise margin - verified via timing analysis using t_PLH, t_PHL, and setup/hold values from the CY74FCT2245TSOCT datasheet.

Does CY74FCT2245TSOCT require external pull-up or pull-down resistors on control pins?

No. The CY74FCT2245TSOCT has internally biased inputs; OE and T/R pins do not require external biasing. However, per datasheet Note 2, all unused inputs must be held at V_CC or GND - either actively driven or tied directly - to prevent floating states that could increase ICC or cause undefined output behavior in the CY74FCT2245TSOCT.

Can CY74FCT2245TSOCT be used in a 3.3-V system?

No. The CY74FCT2245TSOCT is specified only for 4.75–5.25 V operation. Its input thresholds (V_IH = 2.0 V, V_IL = 0.8 V) and output drive (V_OH ≥ 2.4 V) are optimized for 5-V TTL compatibility. Using it with 3.3-V supplies risks undriven inputs, marginal noise margins, and potential damage - use 74LVC245 or similar for 3.3-V domains instead of CY74FCT2245TSOCT.

How does the 25-Ω output series resistor in CY74FCT2245TSOCT improve signal integrity?

The 25-Ω resistor in CY74FCT2245TSOCT is placed in series with each output driver, matching typical PCB trace impedance (50–75 Ω) to suppress reflections at the source. This eliminates ringing and overshoot on unterminated or stub-loaded buses - confirmed by reduced transmission-line noise in CY74FCT2245TSOCT application testing - without requiring layout changes or external components.

Is CY74FCT2245TSOCT pin-compatible with CY74FCT245T?

Yes. The CY74FCT2245TSOCT is functionally and pinout-compatible with CY74FCT245T (same SOIC-20 footprint and signal mapping), but adds integrated 25-Ω output resistors and enhanced edge-rate control. It can directly replace CY74FCT245T in existing designs to improve noise performance without PCB modification - a documented drop-in upgrade path per TI's CY74FCT2245T datasheet.

CY74FCT2245TSOCT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74FCT

Package/Case:: 20-SOIC (0.295", 7.50mm 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:: 15mA, 12mA

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

CY74FCT2245TSOCT FAQ

1.How can I place an order for CY74FCT2245TSOCT through Aetrix?

Please submit a Request for Quotation (RFQ) for CY74FCT2245TSOCT 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 CY74FCT2245TSOCT reliable?

The price and inventory of CY74FCT2245TSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245TSOCT is usually 5 days.

3.What payment methods are accepted for CY74FCT2245TSOCT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245TSOCT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY74FCT2245TSOCT?

CY74FCT2245TSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY74FCT2245TSOCT 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 CY74FCT2245TSOCT?

For technical support, including CY74FCT2245TSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245TSOCT requirements.

6.How does Aetrix verify that CY74FCT2245TSOCT is sourced from the original manufacturer or authorized distributors?

All CY74FCT2245TSOCT 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 CY74FCT2245TSOCT meets industry standards.

7.What is the process for return or replacement of CY74FCT2245TSOCT?

All CY74FCT2245TSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245TSOCT, 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 CY74FCT2245TSOCT part is unused and in its original packaging.

Return procedure for CY74FCT2245TSOCT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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