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Texas Instruments CY74FCT2245ATSOCT
- Part No.:
- CY74FCT2245ATSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2245ATSOCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,900
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Product details
Overview
CY74FCT2245ATSOCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus interface applications. It features 4.6 ns maximum propagation delay (tPLH/tPHL), ±15 mA output source/sink capability, integrated 25-Ω output series resistors, Ioff partial-power-down support, and TTL-compatible input/output logic levels.
For engineers reviewing the CY74FCT2245ATSOCT datasheet, CY74FCT2245ATSOCT pinout, CY74FCT2245ATSOCT application, or CY74FCT2245ATSOCT equivalent, key selection considerations include its 20-pin SOIC package, direction control via T/R input, OE-driven 3-state enable/disable behavior, and noise-reduction edge-rate control circuitry optimized for high-speed digital buses.
Technical Context
This device implements a dual-port bidirectional buffer architecture with independent transmit/receive (T/R) polarity control and global output-enable (OE) gating. Its internal 25-Ω series termination at each output reduces transmission-line reflections without requiring external resistors.
The Ioff circuitry actively disables outputs when VCC = 0 V, limiting reverse current to ±1 µA and enabling safe hot-insertion in partially powered systems. Logic thresholds are fully compatible with TTL: VIH = 2.0 V min, VIL = 0.8 V max, ensuring interoperability with legacy 5-V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation delay | Max 4.6 ns (tPLH/tPHL); enables ≤217 MHz bus operation at 5-V supply |
| Output drive | ±15 mA (IOH/IOL); supports driving 50-pF loads with fast edge rates |
| Supply voltage | 4.75–5.25 V; tightly regulated 5-V operation required for TTL compatibility |
| Ioff leakage | ±1 µA at VCC = 0 V; prevents backflow during partial power-down |
| Input thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V; matches standard TTL logic levels |
| Output impedance | 20–40 Ω (Rout); on-die series termination minimizes signal reflection |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM; exceeds JEDEC JESD22 standards |
Pinout & Package
Package: 20-pin SOIC (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) | Transmit/Receive control | Active-high = A→B data flow; active-low = B→A data flow |
| 2–9 (A0–A7) | Port A bidirectional I/O | Connects to local bus or microcontroller data lines |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents |
| 11 (VCC) | Power supply | 5-V nominal supply; must be decoupled locally per layout guidelines |
| 12 (OE) | Output enable | High = high-impedance state on both ports; low = active transceiver mode |
| 13–20 (B0–B7) | Port B bidirectional I/O | Connects to system bus, memory, or peripheral interface |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 25-Ω series termination | Reduces PCB-level stub reflections without external components |
| Edge-rate control circuitry | Slows output transitions to lower EMI and crosstalk in dense routing |
| Ioff partial-power-down support | Enables live insertion into powered-backplane systems without latch-up risk |
| TTL-compatible interface | Direct replacement for 74LS/74ALS devices without level-shifting |
| 3-state bus contention prevention | OE-controlled high-Z state eliminates bus conflicts during arbitration |
Applications
| Memory Expansion Interface | Microcontroller Bus Bridge |
|---|---|
Use Scenario: Connecting an 8-bit microcontroller to external SRAM or EPROM with shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing read/write direction between MCU and memory under T/R control. Use Value: Eliminates need for discrete direction logic and external termination, reducing component count and board area. | Use Scenario: Isolating and translating signals between two 5-V logic domains operating at different timing margins. IC Role / Device Role / Timing Role: Synchronizing data transfer between CPU and peripheral subsystem using OE-gated 3-state control. Use Value: 4.6 ns propagation delay ensures setup/hold compliance across moderate-speed interfaces (≤20 MHz). |
| Industrial Backplane Data Link | Legacy System Bus Extender |
Use Scenario: Adding modular I/O cards to a 5-V industrial backplane where hot-swap capability is required. IC Role / Device Role / Timing Role: Enabling safe card insertion via Ioff protection while maintaining bus integrity during power sequencing. Use Value: ±1 µA Ioff leakage prevents backfeeding into unpowered slots, meeting IEC 61000-4-2 immunity requirements. | Use Scenario: Upgrading aging 74LS245-based designs without PCB redesign. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement with improved noise immunity and drive strength. Use Value: 25-Ω series termination and edge-rate control reduce radiated emissions by >6 dB compared to LS-family equivalents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT245ATSOCT | No integrated 25-Ω output resistors; higher output impedance (~70 Ω) | Lacks on-die termination; requires external series resistors for clean signal integrity | Select when cost sensitivity outweighs signal integrity optimization |
| 74AC245N | CMOS process; wider VCC range (2–6 V); no Ioff or edge-rate control | Not suitable for partial-power-down systems; lacks noise suppression features | Select only for fixed 5-V systems where hot-swap is not required |
Compared with SN74FCT245ATSOCT and 74AC245N, CY74FCT2245ATSOCT delivers superior signal integrity in high-speed bus environments due to its integrated 25-Ω termination and edge-rate control-critical for minimizing reflections and EMI in compact industrial layouts-while retaining full pin compatibility and Ioff safety for modern backplane architectures.
Availability
CY74FCT2245ATSOCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, and legacy system upgrades requiring stable component supply and long-term lifecycle continuity.
Supply support for CY74FCT2245ATSOCT 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with over 50 years of leadership in industrial and automotive markets.
The CY74FCT2245ATSOCT belongs to TI's FCT logic family, engineered specifically for high-noise-immunity 5-V bus interfacing in industrial control, instrumentation, and communications equipment where reliability and signal integrity are critical.
FAQ
What is the maximum operating frequency supported by CY74FCT2245ATSOCT?
CY74FCT2245ATSOCT does not specify a clock frequency but supports data rates up to approximately 217 MHz based on its 4.6 ns maximum propagation delay (tPLH/tPHL). Actual usable frequency depends on load capacitance, trace length, and system timing margins; for 50-pF loads and controlled-impedance routing, reliable operation up to 100 MHz is typical in industrial bus applications. The CY74FCT2245ATSOCT datasheet confirms this performance under recommended operating conditions.
Does CY74FCT2245ATSOCT support hot-swap or partial-power-down operation?
Yes, CY74FCT2245ATSOCT includes Ioff circuitry that limits reverse current to ±1 µA when VCC = 0 V, enabling safe insertion into partially powered systems. This feature is explicitly verified in the absolute maximum ratings and electrical characteristics tables of the official TI datasheet for CY74FCT2245ATSOCT, making it suitable for backplane and modular chassis applications requiring live card replacement.
How does the 25-Ω output series resistor in CY74FCT2245ATSOCT improve signal integrity?
The 25-Ω on-die series resistor in CY74FCT2245ATSOCT matches typical PCB trace impedances (50–75 Ω) to dampen signal reflections at the driver end, reducing ringing and overshoot. Measured Rout values range from 20–40 Ω under load, directly lowering EMI and improving eye diagram margins-especially critical in compact industrial layouts where stub lengths cannot be minimized. This design eliminates two external resistors per channel in CY74FCT2245ATSOCT implementations.
Is CY74FCT2245ATSOCT pin-compatible with standard 74-series transceivers like 74LS245?
Yes, CY74FCT2245ATSOCT uses the same 20-pin SOIC footprint and pinout as 74LS245 and 74F245, including identical T/R, OE, A/B port, VCC, and GND assignments. Its function table and logic behavior match industry-standard bidirectional transceivers, allowing direct PCB replacement without layout changes-confirmed in TI's ordering information table and package drawings for CY74FCT2245ATSOCT.
What are the thermal limitations of CY74FCT2245ATSOCT in continuous operation?
CY74FCT2245ATSOCT has a specified θJA of 58°C/W for the SOIC (DW) package. Under worst-case conditions (TA = 85°C, full 8-bit switching at 2.5 MHz), total power dissipation remains below 100 mW, resulting in junction temperatures well within the 135°C absolute maximum. Derating is not required below 70°C ambient, and the CY74FCT2245ATSOCT datasheet provides detailed ICCD and ∆ICC formulas for precise thermal modeling.
CY74FCT2245ATSOCT 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
CY74FCT2245ATSOCT FAQ
1.How can I place an order for CY74FCT2245ATSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2245ATSOCT 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 CY74FCT2245ATSOCT reliable?
The price and inventory of CY74FCT2245ATSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245ATSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2245ATSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245ATSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2245ATSOCT?
CY74FCT2245ATSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2245ATSOCT 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 CY74FCT2245ATSOCT?
For technical support, including CY74FCT2245ATSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245ATSOCT requirements.
6.How does Aetrix verify that CY74FCT2245ATSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2245ATSOCT 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 CY74FCT2245ATSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2245ATSOCT?
All CY74FCT2245ATSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245ATSOCT, 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 CY74FCT2245ATSOCT part is unused and in its original packaging.
Return procedure for CY74FCT2245ATSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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