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

Texas Instruments CY74FCT2245CTSOCT

Name: CY74FCT2245CTSOCT
Brand: Texas Instruments
SKU: CY74FCT2245CTSOCT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY74FCT2245CTSOCT

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: CY74FCT2245CTSOCT.pdf

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

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Product details

Overview

CY74FCT2245CTSOCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data transfer between TTL- and CMOS-compatible systems. It features 25-Ω output series resistors, I_off partial-power-down support, 4.1 ns max propagation delay (t_PLH/t_PHL), ±15 mA output drive, and operates from 4.75 V to 5.25 V over –40°C to +85°C.

For engineers reviewing the CY74FCT2245CTSOCT datasheet, CY74FCT2245CTSOCT pinout, CY74FCT2245CTSOCT application, or CY74FCT2245CTSOCT equivalent, key selection criteria include bidirectional bus isolation, low-noise edge-rate control, I_off-enabled system power sequencing, and SOIC-20 compatibility in high-density PCB layouts.

Technical Context

The CY74FCT2245CTSOCT implements a dual-port, direction-controlled transceiver architecture with independent T/R (transmit/receive) and OE (output enable) logic inputs. Its internal 25-Ω series termination at each output reduces transmission-line reflections without external resistors, while edge-rate control circuitry limits dV/dt to suppress crosstalk and ground bounce.

I_off protection activates when V_CC = 0 V, limiting reverse current to ±1 µA per I/O terminal - enabling safe hot-insertion and partial-power-down operation. The device maintains full TTL input threshold compatibility (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and drives 50-pF loads with guaranteed VOL ≤ 0.55 V at 12 mA sink and VOH ≥ 2.4 V at –15 mA source.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	Max 4.1 ns (A↔B path); enables sub-250-MHz bus timing in synchronous systems.
Output Drive	12 mA sink / 15 mA source; sufficient to drive multiple TTL inputs or 50-Ω transmission lines.
Supply Voltage	4.75–5.25 V; tightly regulated 5-V rail requirement ensures noise margin and compatibility with legacy TTL buses.
I_off Current	±1 µA at V_CC = 0 V; prevents backflow during power sequencing or hot-swap events.
ESD Protection	2000-V HBM, 200-V MM, 1000-V CDM; exceeds JEDEC JESD22 standards for board-level robustness.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V; fully interoperable with standard TTL logic families without level shifting.
Termination	25-Ω on-chip series resistor per output; eliminates need for discrete termination, reducing BOM count and layout area.

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.

Pin/Terminal	Circuit Role	Design Meaning
1 (T/R)	Direction control input	High = A→B data flow; low = B→A; determines real-time bus arbitration path.
2–9 (A0–A7)	Port A bidirectional I/O	Connects to local bus or microcontroller side; supports TTL/CMOS voltage levels.
10 (GND)	Ground reference	Primary return path for all I/O and supply currents; must be low-inductance connection.
11 (V_CC)	Power supply	5-V nominal supply; requires local 0.1-µF ceramic decoupling adjacent to pin.
12 (OE)	Output enable input	High = high-impedance state on both ports; essential for bus contention avoidance.
13–20 (B0–B7)	Port B bidirectional I/O	Connects to peripheral or memory bus side; electrically identical to Port A.

Key Features

Feature	Design Value
On-die 25-Ω series termination	Reduces signal reflections on PCB traces up to 15 cm without external components.
I_off partial-power-down protection	Enables safe operation when V_CC is unpowered while other system rails remain active.
Edge-rate controlled outputs	Guarantees dV/dt < 3 V/ns to minimize simultaneous switching noise (SSN) in dense layouts.
TTL-compatible input thresholds	Accepts standard 0.8 V/2.0 V logic levels - no level translators needed for 5-V TTL interfaces.
3-state bus hold-off via OE	Single-pin disable of all 16 I/Os prevents bus contention during reset or configuration phases.

Applications

PCI Bus Isolation	Microcontroller Peripheral Interface
Use Scenario: Isolating legacy PCI add-in cards from host bridge logic during hot-plug or power sequencing. IC Role / Device Role / Timing Role: Bidirectional data buffer with direction control synchronized to PCI FRAME# and IRDY# signals. Use Value: Eliminates external termination resistors and supports I_off-based safe insertion while maintaining 4.1 ns timing compliance.	Use Scenario: Interfacing an 8-bit microcontroller GPIO port to external SRAM or flash memory with shared address/data bus. IC Role / Device Role / Timing Role: Directional bus transceiver controlled by WR#/RD# and address strobe to separate read/write paths. Use Value: 12 mA sink capability drives memory control lines directly; 25-Ω termination ensures clean edges on 10-cm traces.
Industrial Backplane Communication	Test Equipment Signal Routing
Use Scenario: Buffering parallel control signals across modular rack-mounted I/O modules with independent power domains. IC Role / Device Role / Timing Role: Hot-swap-capable bus translator enabling module insertion/removal without system reset. Use Value: I_off limits backfeed to < ±1 µA when module V_CC is off; SOIC-20 footprint fits constrained backplane spacing.	Use Scenario: Reconfigurable signal routing in automated test equipment (ATE) where DUT interface voltages vary between 3.3 V and 5 V. IC Role / Device Role / Timing Role: Level-agnostic bidirectional switch enabling shared test head resources across mixed-voltage DUTs. Use Value: TTL-compatible inputs accept 3.3 V logic highs; 5-V supply ensures 2.4 V VOH margin into 50-Ω loads.

PCI Bus Isolation

Microcontroller Peripheral Interface

Use Scenario: Isolating legacy PCI add-in cards from host bridge logic during hot-plug or power sequencing.

IC Role / Device Role / Timing Role: Bidirectional data buffer with direction control synchronized to PCI FRAME# and IRDY# signals.

Use Value: Eliminates external termination resistors and supports I_off-based safe insertion while maintaining 4.1 ns timing compliance.

Use Scenario: Interfacing an 8-bit microcontroller GPIO port to external SRAM or flash memory with shared address/data bus.

IC Role / Device Role / Timing Role: Directional bus transceiver controlled by WR#/RD# and address strobe to separate read/write paths.

Use Value: 12 mA sink capability drives memory control lines directly; 25-Ω termination ensures clean edges on 10-cm traces.

Industrial Backplane Communication

Test Equipment Signal Routing

Use Scenario: Buffering parallel control signals across modular rack-mounted I/O modules with independent power domains.

IC Role / Device Role / Timing Role: Hot-swap-capable bus translator enabling module insertion/removal without system reset.

Use Value: I_off limits backfeed to < ±1 µA when module V_CC is off; SOIC-20 footprint fits constrained backplane spacing.

Use Scenario: Reconfigurable signal routing in automated test equipment (ATE) where DUT interface voltages vary between 3.3 V and 5 V.

IC Role / Device Role / Timing Role: Level-agnostic bidirectional switch enabling shared test head resources across mixed-voltage DUTs.

Use Value: TTL-compatible inputs accept 3.3 V logic highs; 5-V supply ensures 2.4 V VOH margin into 50-Ω loads.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74FCT245CTSOCT	No integrated 25-Ω output termination; higher edge rates increase reflection risk on long traces.	Suitable only when external termination is acceptable and board space allows discrete resistors.	Select if cost sensitivity outweighs layout simplification and noise reduction benefits.
74LVC245APW,215	3.3-V only operation; 1.65–3.6-V supply range; lower drive (24 mA sink at 3.3 V), no I_off.	Requires level translation for 5-V systems; not suitable for partial-power-down or mixed-voltage backplanes.	Choose only for new 3.3-V designs where ultra-low static power (< 10 µA ICC) is critical.

Compared with SN74FCT245CTSOCT and 74LVC245APW,215, the CY74FCT2245CTSOCT uniquely combines on-die termination, I_off, and 5-V TTL compatibility - making it the only option that eliminates external components while supporting hot-swap and legacy bus integration in a single SOIC-20 package.

Availability

CY74FCT2245CTSOCT is available at Aetrix Electronics and suitable for industrial backplane communication, microcontroller peripheral interfacing, and PCI bus isolation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT2245CTSOCT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The CY74FCT2245CTSOCT belongs to TI's FCT logic family, engineered specifically for noise-immune, high-speed 5-V bus interfacing in mission-critical industrial and telecom infrastructure where signal integrity and power sequencing reliability are mandatory.

FAQ

What is the maximum operating temperature range for the CY74FCT2245CTSOCT?

The CY74FCT2245CTSOCT is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's recommended operating conditions and supported by thermal impedance data (θ_JA = 58°C/W for SOIC package), ensuring reliable performance in enclosed enclosures or high-ambient environments without derating.

Does the CY74FCT2245CTSOCT support hot-swap functionality?

Yes, the CY74FCT2245CTSOCT supports hot-swap via its I_off circuitry. When V_CC = 0 V, reverse current is limited to ±1 µA per I/O terminal, preventing damaging backflow from live buses into the unpowered device - a key requirement for modular systems requiring field-replaceable units.

How does the 25-Ω output series resistance in the CY74FCT2245CTSOCT improve signal integrity?

The 25-Ω on-die series resistor in the CY74FCT2245CTSOCT matches typical PCB trace impedances (40–70 Ω) to dampen reflections at the driver end. This eliminates ringing and overshoot on traces up to ~15 cm, reducing EMI and improving timing margins without adding discrete components or consuming board area.

Can the CY74FCT2245CTSOCT replace the CY74FCT245T in an existing design?

Yes - the CY74FCT2245CTSOCT is functionally and pinout-compatible with the CY74FCT245T, but adds integrated 25-Ω output termination and improved noise characteristics. No PCB changes are required; the replacement improves signal integrity and reduces component count by eliminating eight external 25-Ω resistors.

What are the absolute maximum ratings for V_CC and input voltage on the CY74FCT2245CTSOCT?

The CY74FCT2245CTSOCT 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 tolerance beyond normal operation, though recommended operating conditions specify 4.75–5.25 V for V_CC and 0–5.25 V for inputs.

CY74FCT2245CTSOCT 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

CY74FCT2245CTSOCT FAQ

1.How can I place an order for CY74FCT2245CTSOCT through Aetrix?

Please submit a Request for Quotation (RFQ) for CY74FCT2245CTSOCT 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 CY74FCT2245CTSOCT reliable?

The price and inventory of CY74FCT2245CTSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245CTSOCT is usually 5 days.

3.What payment methods are accepted for CY74FCT2245CTSOCT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245CTSOCT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY74FCT2245CTSOCT?

CY74FCT2245CTSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY74FCT2245CTSOCT 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 CY74FCT2245CTSOCT?

For technical support, including CY74FCT2245CTSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245CTSOCT requirements.

6.How does Aetrix verify that CY74FCT2245CTSOCT is sourced from the original manufacturer or authorized distributors?

All CY74FCT2245CTSOCT 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 CY74FCT2245CTSOCT meets industry standards.

7.What is the process for return or replacement of CY74FCT2245CTSOCT?

All CY74FCT2245CTSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245CTSOCT, 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 CY74FCT2245CTSOCT part is unused and in its original packaging.

Return procedure for CY74FCT2245CTSOCT:

1.Submit a request within 90 days.

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

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