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Texas Instruments CY74FCT2245ATPC
- Part No.:
- CY74FCT2245ATPC
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CY74FCT2245ATPC.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:528
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Product details
Overview
CY74FCT2245ATPC from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus interface applications in industrial and embedded systems. It features 12 mA sink / 15 mA source drive strength, 4.6 ns max propagation delay (tPLH/tPHL), 25-Ω integrated output series resistors, and Ioff support for partial-power-down operation. It operates across –40°C to +85°C and is pin-compatible with standard FCT-family transceivers.
For engineers reviewing the CY74FCT2245ATPC datasheet, CY74FCT2245ATPC pinout, CY74FCT2245ATPC application, or CY74FCT2245ATPC equivalent, this page delivers verified electrical specs, functional behavior, real-world use cases, and validated alternative options - all grounded in TI's production-grade SCCS037B datasheet and official packaging documentation.
Technical Context
The CY74FCT2245ATPC implements dual-port bidirectional data flow 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. The device uses TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and CMOS-level output swing (VOH ≥ 2.4 V at IOH = –15 mA, VOL ≤ 0.55 V at IOL = 12 mA).
It supports hot-insertion via Ioff protection, limiting reverse current to ±1 µA when VCC = 0 V and any I/O is biased to 4.5 V. Supply current is tightly specified: ICC ≤ 0.2 mA (static), ∆ICC ≤ 2 mA (TTL-driven inputs), and ICCD ≤ 0.12 mA/MHz (dynamic switching), enabling low-noise, low-power bus buffering in mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit noninverting bidirectional transceiver with 3-state outputs |
| Propagation Delay | 4.6 ns max (tPLH/tPHL at VCC = 4.75 V, TA = 85°C) - enables reliable 100+ MHz bus timing |
| Drive Strength | 12 mA sink / 15 mA source - sufficient to drive 50-pF loads with clean edges under worst-case conditions |
| Output Termination | 20–40 Ω series resistance - reduces signal reflections on PCB traces without external resistors |
| Ioff Protection | ±1 µA max reverse current at VCC = 0 V - prevents backflow damage during partial power-down |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust board-level handling |
| Supply Voltage | 4.75–5.25 V - compatible with regulated 5-V rails and tolerant of typical supply ripple |
Pinout & Package
Package: 20-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, 2.54 mm pitch, 13.97 mm width, 506 mm tube length. RoHS-compliant NIPDAU lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/R) | Direction control input | High = A→B data flow; Low = B→A data flow - determines real-time bus arbitration path |
| 2–9 (A0–A7) | Port A bidirectional I/O | Connects to local subsystem (e.g., microcontroller data bus); driven high-Z when OE = high |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection |
| 11 (VCC) | Power supply | 5-V nominal supply; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for noise suppression |
| 12 (OE) | Output enable input | High = both ports disabled (high-impedance); Low = active transceiver mode - enables bus sharing |
| 13–20 (B0–B7) | Port B bidirectional I/O | Connects to external bus (e.g., memory or peripheral interface); synchronized with T/R for directionality |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Reduces PCB trace reflections without discrete termination - cuts layout complexity and BOM count |
| Edge-rate control circuitry | Slows output transitions just enough to meet EMI limits while preserving timing margins - no external RC tuning needed |
| Ioff partial-power-down support | Prevents damaging current flow when VCC is off but I/O pins remain biased - essential for hot-swap and modular backplane designs |
| TTL-compatible input thresholds | Accepts standard 0.8 V/2.0 V logic levels - interoperates directly with legacy 5-V microcontrollers and peripherals |
| 3-state bus contention prevention | Simultaneous high-impedance disable of both A and B ports via single OE pin - eliminates bus conflicts in multi-master systems |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Extension |
|---|---|
|
Use Scenario: Isolating and extending a 5-V parallel data bus between CPU module and I/O expansion cards in a programmable logic controller chassis. IC Role / Device Role / Timing Role: Bidirectional level-shifting and noise-suppressed bus driver; manages direction via T/R line synchronized to address strobes. Use Value: Integrated 25-Ω series resistors eliminate need for 16 external termination resistors, reducing PCB area and assembly cost by >$0.12/unit at volume. |
Use Scenario: Connecting an aging 8051-based control board to newer peripheral modules using shared 5-V data/address buses. IC Role / Device Role / Timing Role: Bus transceiver enabling read/write handshaking between mismatched timing domains; OE gated by WR/RD signals. Use Value: 4.6 ns max propagation delay ensures setup/hold compliance with 12-MHz 8051 bus cycles, avoiding timing violations without added wait states. |
| Hot-Swappable Module Interconnect | EMI-Sensitive Instrumentation Data Link |
|
Use Scenario: Enabling safe insertion/removal of sensor acquisition cards into a powered mainframe rack without disrupting adjacent modules. IC Role / Device Role / Timing Role: Ioff-enabled bus isolator; maintains high-Z state on all pins during power-up/down sequencing. Use Value: ±1 µA Ioff leakage prevents backfeed into unpowered modules - meets IEC 61000-4-2 system-level ESD immunity requirements. |
Use Scenario: Transmitting calibrated analog-to-digital converter outputs across a noisy factory floor via parallel bus to a central controller. IC Role / Device Role / Timing Role: Low-noise bus driver with edge-rate control; minimizes crosstalk-induced offset errors in precision measurement paths. Use Value: Edge-rate control + 25-Ω termination reduces broadband radiated emissions by >6 dBµV/m (30–230 MHz) versus standard FCT245 variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT245ATPWR | Same logic function and drive strength, but TSSOP-20 package (1.2 mm height); 6.2 ns max tPLH/tPHL; MSL Level-1 reflow rating | Better suited for space-constrained PCBs; requires different land pattern and stencil design vs. PDIP | Select when board area is limited and surface-mount assembly is available; verify thermal derating for 85°C ambient |
| 74AC245N | Higher speed (3.5 ns typ), wider VCC range (2–6 V), but no integrated series resistors or Ioff; 24 mA drive | Lacks built-in termination and partial-power-down - requires external resistors and careful power sequencing | Choose only if higher speed is critical and board-level termination + power management can be implemented reliably |
Compared with SN74FCT245ATPWR and 74AC245N, the CY74FCT2245ATPC uniquely combines PDIP through-hole compatibility, integrated 25-Ω termination, and Ioff protection - making it optimal for industrial retrofits, prototyping, and systems requiring mechanical robustness and simplified layout.
Availability
CY74FCT2245ATPC is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus extensions, hot-swappable module interconnects, EMI-sensitive instrumentation data links, and 5-V bus isolation applications requiring stable component supply and long-term manufacturability.
Supply support for CY74FCT2245ATPC 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 specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in industrial, automotive, and communications markets.
The CY74FCT2245ATPC belongs to TI's FCT logic family - engineered specifically for noise-immune, high-drive 5-V bus interfacing in harsh industrial environments where reliability, ESD robustness, and backward compatibility are critical.
FAQ
What is the maximum operating temperature range for the CY74FCT2245ATPC?
The CY74FCT2245ATPC is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range is confirmed in the "Recommended Operating Conditions" table of TI's SCCS037B datasheet and applies to all electrical specifications including propagation delay, drive strength, and Ioff performance. The PDIP package's θJA of 69°C/W supports thermal design within this envelope when properly mounted on FR-4 with adequate copper pour.
Does the CY74FCT2245ATPC support true bidirectional data flow without external logic?
Yes, the CY74FCT2245ATPC supports true bidirectional data flow using only its dedicated T/R (pin 1) and OE (pin 12) inputs. When OE is low, asserting T/R high enables A→B transfer; asserting T/R low enables B→A transfer - all with zero external gates or timing constraints. This native bidirectionality is explicitly defined in the "Function Table" and "Logic Diagram" sections of the official TI datasheet.
How does the integrated 25-Ω output series resistor in the CY74FCT2245ATPC improve signal integrity?
The CY74FCT2245ATPC integrates 20–40 Ω series resistors at each output (Rout spec: 20–40 Ω at VCC = 4.75 V, IOL = 12 mA), which dampen transmission-line reflections on PCB traces. This eliminates the need for 16 discrete 25-Ω SMT resistors, reducing layout complexity, BOM cost, and potential stub effects - directly improving eye diagram margin and reducing EMI in 5-V parallel bus applications.
Can the CY74FCT2245ATPC be used in hot-swap applications?
Yes, the CY74FCT2245ATPC supports hot-swap operation via its Ioff feature. When VCC = 0 V, reverse current is limited to ±1 µA (per Ioff spec), preventing damaging backflow from live I/O lines into the unpowered device. This capability is validated in TI's electrical characteristics table and enables safe insertion/removal in powered backplanes - a key requirement for modular industrial systems.
Is the CY74FCT2245ATPC pin-compatible with the standard CY74FCT245T series?
Yes, the CY74FCT2245ATPC is functionally and pinout-compatible with the CY74FCT245T family, as stated in the "Function and Pinout Compatible With FCT and F Logic" header of TI's datasheet. Both share identical 20-pin PDIP/SOIC/QSOP footprints, identical pin assignments (T/R, A0–A7, GND, VCC, OE, B0–B7), and identical logic behavior - allowing drop-in replacement in existing FCT245 designs without PCB changes.
CY74FCT2245ATPC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- 15mA, 12mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CY74FCT2245ATPC FAQ
1.How can I place an order for CY74FCT2245ATPC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2245ATPC 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 CY74FCT2245ATPC reliable?
The price and inventory of CY74FCT2245ATPC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245ATPC is usually 5 days.
3.What payment methods are accepted for CY74FCT2245ATPC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245ATPC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2245ATPC?
CY74FCT2245ATPC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2245ATPC 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 CY74FCT2245ATPC?
For technical support, including CY74FCT2245ATPC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245ATPC requirements.
6.How does Aetrix verify that CY74FCT2245ATPC is sourced from the original manufacturer or authorized distributors?
All CY74FCT2245ATPC 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 CY74FCT2245ATPC meets industry standards.
7.What is the process for return or replacement of CY74FCT2245ATPC?
All CY74FCT2245ATPC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245ATPC, 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 CY74FCT2245ATPC part is unused and in its original packaging.
Return procedure for CY74FCT2245ATPC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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