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

Texas Instruments CY74FCT2245CTSOC

Name: CY74FCT2245CTSOC
Brand: Texas Instruments
SKU: CY74FCT2245CTSOC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY74FCT2245CTSOC

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: CY74FCT2245CTSOC.pdf

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

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Product details

Overview

CY74FCT2245CTSOC from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented TTL/CMOS interfacing. It features 4.1 ns maximum propagation delay, 25-Ω integrated output series resistors, I_off partial-power-down support, ±1 µA I_off current at V_CC = 0 V, and operates across –40°C to +85°C. It enables robust data transfer between A and B buses in industrial control backplanes.

For engineers reviewing the CY74FCT2245CTSOC datasheet, CY74FCT2245CTSOC pinout, CY74FCT2245CTSOC application, or CY74FCT2245CTSOC equivalent, key selection criteria include bidirectional bus timing (t_PLH/t_PHL ≤ 4.1 ns), 3-state enable/disable performance (t_PZH/t_PHZ ≤ 5.8 ns), I_off-enabled system power sequencing, and SOIC-20 package compatibility with legacy FCT logic layouts.

Technical Context

The CY74FCT2245CTSOC implements a dual-rail bidirectional buffer architecture controlled by independent T/R (transmit/receive) and OE (output-enable) inputs. Its edge-rate control circuitry and on-die 20–40 Ω series termination resistors suppress transmission-line reflections without external components.

It supports mixed-voltage interfacing via TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and CMOS-level output swing (V_OH ≥ 2.4 V at I_OH = –15 mA, V_OL ≤ 0.55 V at I_OL = 12 mA), while its I_off protection blocks reverse current flow during partial power-down states.

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 rails with ±5% tolerance.
Propagation Delay (t_PLH/t_PHL)	≤ 4.1 ns - Enables high-speed bidirectional bus communication up to ~240 MHz effective data rate.
Output Drive	12 mA sink / 15 mA source - Sufficient to drive 50-pF loads with clean edges and minimal overshoot.
I_off Current	±1 µA at V_CC = 0 V - Prevents damaging backflow when powered down in hot-swap or multi-rail systems.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - Guarantees interoperability with standard TTL and CMOS logic families.
ESD Protection	2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade ESD robustness requirements per JESD22.
Package Thermal Impedance (θ_JA)	58°C/W - Supports continuous operation at full load in ambient temperatures up to +85°C without forced cooling.

Pinout & Package

SOIC-20 package (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 (260°C peak reflow).

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 controller or microprocessor bus - TTL/CMOS compatible with 12 mA sink capability.
10 (GND)	Ground reference	Primary return path for all I/O and supply currents - Requires low-inductance connection to minimize ground bounce.
11 (V_CC)	Power supply	+5 V supply rail - Must be decoupled with ≥0.1 µF ceramic capacitor near pin 11.
12 (OE)	Output-enable control	High = high-impedance state on both ports - Allows shared-bus contention-free operation.
13–20 (B0–B7)	Port B bidirectional I/O	Connects to peripheral or memory bus - Matches A-port electrical specs for symmetrical bidirectional signaling.

Key Features

Feature	Design Value
Integrated 25-Ω series output resistors	Reduces signal reflections on PCB traces >10 cm, eliminating need for discrete termination resistors.
Edge-rate control circuitry	Slows output transitions just enough to meet FCC Class B radiated emissions limits without sacrificing speed.
I_off partial-power-down protection	Enables safe insertion/removal in live backplanes and prevents latch-up during V_CC ramp-up/down sequences.
TTL-compatible input thresholds	Accepts standard 0.8 V/2.0 V logic levels - simplifies interface with legacy microcontrollers and ASICs.
3-state output isolation	Ensures <10 µA leakage in disabled state - critical for multi-drop bus integrity and low standby power.

Applications

Industrial PLC Backplane	Automotive Body Control Module
Use Scenario: Bidirectional data exchange between main CPU and distributed I/O modules over 15-cm routed traces. IC Role / Device Role / Timing Role: Bus transceiver isolating CPU address/data bus from field-side peripherals while maintaining signal integrity. Use Value: On-die 25-Ω resistors eliminate 16 external terminators; 4.1 ns delay ensures setup/hold compliance at 20-MHz bus clock.	Use Scenario: Interfacing infotainment head unit with door module controllers via shared CAN-adjacent diagnostic bus. IC Role / Device Role / Timing Role: Voltage-level translator and bus driver enabling 5-V MCU to communicate with 3.3-V sensor nodes. Use Value: I_off protection prevents backfeed during ignition cycling; TTL-compatible inputs accept direct connection to legacy MCU GPIOs.
Test Equipment Digital I/O Card	Medical Imaging Data Link
Use Scenario: Reconfigurable digital stimulus/response channel supporting multiple DUT interfaces on a single PCB. IC Role / Device Role / Timing Role: Programmable direction transceiver allowing same connector pins to serve as input or output based on test sequence. Use Value: T/R and OE pins enable software-controlled bus reversal; 12 mA drive supports driving long cables into 50-Ω scope inputs.	Use Scenario: High-reliability data handoff between FPGA-based image processor and ADC/DAC subsystem in portable ultrasound. IC Role / Device Role / Timing Role: Isolation buffer preventing noise coupling between analog and digital domains while preserving timing accuracy. Use Value: 58°C/W θ_JA allows continuous operation in sealed enclosures; ESD ratings exceed IEC 61000-4-2 Level 4 requirements.

Industrial PLC Backplane

Automotive Body Control Module

Use Scenario: Bidirectional data exchange between main CPU and distributed I/O modules over 15-cm routed traces.

IC Role / Device Role / Timing Role: Bus transceiver isolating CPU address/data bus from field-side peripherals while maintaining signal integrity.

Use Value: On-die 25-Ω resistors eliminate 16 external terminators; 4.1 ns delay ensures setup/hold compliance at 20-MHz bus clock.

Use Scenario: Interfacing infotainment head unit with door module controllers via shared CAN-adjacent diagnostic bus.

IC Role / Device Role / Timing Role: Voltage-level translator and bus driver enabling 5-V MCU to communicate with 3.3-V sensor nodes.

Use Value: I_off protection prevents backfeed during ignition cycling; TTL-compatible inputs accept direct connection to legacy MCU GPIOs.

Test Equipment Digital I/O Card

Medical Imaging Data Link

Use Scenario: Reconfigurable digital stimulus/response channel supporting multiple DUT interfaces on a single PCB.

IC Role / Device Role / Timing Role: Programmable direction transceiver allowing same connector pins to serve as input or output based on test sequence.

Use Value: T/R and OE pins enable software-controlled bus reversal; 12 mA drive supports driving long cables into 50-Ω scope inputs.

Use Scenario: High-reliability data handoff between FPGA-based image processor and ADC/DAC subsystem in portable ultrasound.

IC Role / Device Role / Timing Role: Isolation buffer preventing noise coupling between analog and digital domains while preserving timing accuracy.

Use Value: 58°C/W θ_JA allows continuous operation in sealed enclosures; ESD ratings exceed IEC 61000-4-2 Level 4 requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74FCT245CTSOCT	Same FCT family, identical pinout and function but lacks integrated 25-Ω series resistors; 4.6 ns max t_PLH.	Requires external termination for reflection control; suitable where board space permits discrete resistors.	Select when cost sensitivity outweighs layout simplification; verify trace impedance matching externally.
74LVC245APW	3.3-V only operation (1.65–3.6 V), 3.5 ns max t_PLH, no I_off; TSSOP-20 package.	Not compatible with 5-V systems; requires level-shifting for mixed-voltage designs.	Choose only for new 3.3-V-only designs prioritizing speed and lower static power over voltage flexibility.

Compared with SN74FCT245CTSOCT and 74LVC245APW, the CY74FCT2245CTSOC uniquely combines 5-V operation, integrated termination, I_off protection, and sub-4.2 ns timing-making it optimal for retrofitting legacy industrial backplanes without layout changes.

Availability

CY74FCT2245CTSOC is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical imaging data links requiring stable component supply and long-term obsolescence management.

Supply support for CY74FCT2245CTSOC 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 with emphasis on reliability, longevity, and industrial-grade qualification.

The CY74FCT2245CTSOC belongs to TI's FCT logic family, engineered specifically for noise-immune, high-speed bus interfacing in harsh environments where signal integrity and power sequencing robustness are critical.

FAQ

What is the maximum operating temperature range for the CY74FCT2245CTSOC?

The CY74FCT2245CTSOC is rated for operation from –40°C to +85°C ambient temperature. This range is validated per JEDEC JESD78 and supported by thermal characterization showing θ_JA = 58°C/W in SOIC-20 package. The device maintains full electrical specifications-including 4.1 ns propagation delay and 12 mA output drive-across this entire range.

Does the CY74FCT2245CTSOC support hot-swap or partial-power-down operation?

Yes, the CY74FCT2245CTSOC supports partial-power-down operation via its I_off circuitry. When V_CC = 0 V, I_off limits reverse current to ±1 µA even with up to 4.5 V applied at I/O pins. This feature protects the device and upstream circuitry during live insertion or asymmetric power sequencing-common in modular industrial backplanes where CY74FCT2245CTSOC is deployed.

What is the purpose of the 25-Ω output series resistors in the CY74FCT2245CTSOC?

The 25-Ω output series resistors in the CY74FCT2245CTSOC are integrated to dampen transmission-line reflections on PCB traces longer than ~10 cm. They reduce ringing and overshoot without requiring external components, directly improving signal integrity in bus-oriented applications such as industrial control backplanes where CY74FCT2245CTSOC serves as the primary data bridge.

Can the CY74FCT2245CTSOC replace the CY74FCT245T in an existing design?

Yes-the CY74FCT2245CTSOC is functionally and pinout-compatible with the CY74FCT245T and explicitly stated in its datasheet as a drop-in replacement. Both share identical SOIC-20 pin mapping, T/R and OE control logic, and TTL/CMOS interface levels. The CY74FCT2245CTSOC adds integrated 25-Ω resistors and tighter 4.1 ns timing, enhancing noise immunity without requiring PCB modifications.

What are the absolute maximum ratings for V_CC and input voltage on the CY74FCT2245CTSOC?

The CY74FCT2245CTSOC has an absolute maximum V_CC rating of –0.5 V to +7 V and DC input voltage range of –0.5 V to +7 V. These ratings allow safe handling during assembly and transient overvoltage events, though recommended operating conditions specify V_CC = 4.75–5.25 V and input voltages bounded by GND and V_CC. Exceeding absolute maxima may cause permanent damage.

CY74FCT2245CTSOC Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74FCT

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

Packaging:: Tube

Product Status:: Obsolete

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

CY74FCT2245CTSOC FAQ

1.How can I place an order for CY74FCT2245CTSOC through Aetrix?

Please submit a Request for Quotation (RFQ) for CY74FCT2245CTSOC 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 CY74FCT2245CTSOC reliable?

The price and inventory of CY74FCT2245CTSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245CTSOC is usually 5 days.

3.What payment methods are accepted for CY74FCT2245CTSOC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245CTSOC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY74FCT2245CTSOC?

CY74FCT2245CTSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY74FCT2245CTSOC 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 CY74FCT2245CTSOC?

For technical support, including CY74FCT2245CTSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245CTSOC requirements.

6.How does Aetrix verify that CY74FCT2245CTSOC is sourced from the original manufacturer or authorized distributors?

All CY74FCT2245CTSOC 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 CY74FCT2245CTSOC meets industry standards.

7.What is the process for return or replacement of CY74FCT2245CTSOC?

All CY74FCT2245CTSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245CTSOC, 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 CY74FCT2245CTSOC part is unused and in its original packaging.

Return procedure for CY74FCT2245CTSOC:

1.Submit a request within 90 days.

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

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