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Texas Instruments CY74FCT245ATPC
- Part No.:
- CY74FCT245ATPC
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CY74FCT245ATPC.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:412
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Product details
Overview
CY74FCT245ATPC from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data routing between two TTL/CMOS-compatible buses. It features 64-mA sink / 32-mA source drive strength, 4.6-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and edge-rate control for noise reduction. Used in industrial control backplanes and legacy system bus isolation.
For engineers reviewing the CY74FCT245ATPC datasheet, CY74FCT245ATPC pinout, CY74FCT245ATPC application, or CY74FCT245ATPC equivalent, key selection criteria include its 20-pin PDIP package, –40°C to +85°C operating range, 4.5–5.5-V supply compatibility, and direction-control (T/R) plus output-enable (OE) logic interface.
Technical Context
The CY74FCT245ATPC implements dual-bus bidirectional data flow via a single transmit/receive (T/R) control input: low enables B→A transfer, high enables A→B transfer. Output enable (OE) independently places both A and B ports into high-impedance state when asserted high.
Its FCT-family architecture delivers TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) and CMOS-level VOH (≥2.4 V at IOH = –32 mA) with matched rise/fall times. Ioff circuitry limits reverse current to ±1 µA when VCC = 0 V, enabling safe hot-insertion and partial-power-down operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit noninverting bidirectional transceiver with 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS systems |
| Propagation Delay | Max 4.6 ns (tPLH/tPHL) - supports high-speed bus timing up to ~200 MHz data rate |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads and multiple TTL inputs |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications |
| Ioff Current | ±1 µA at VCC = 0 V - prevents backflow during power sequencing or hot-swap |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets JEDEC JESD22-A114/A115/C101 |
Pinout & Package
Package: 20-pin plastic dual in-line package (PDIP-N), 0.300-inch body width, through-hole mounting. RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-high control: high disables both A and B ports (3-state) |
| 2–9 (A0–A7) | Port A Data Inputs/Outputs | Bidirectional I/O pins connected to local bus or subsystem |
| 10 (GND) | Ground | Reference return for all signals and power |
| 11 (VCC) | Power Supply | +5 V supply rail; decoupling required near pin |
| 12–19 (B0–B7) | Port B Data Inputs/Outputs | Bidirectional I/O pins connected to remote bus or peripheral |
| 20 (T/R) | Transmit/Receive Control | Active-high: high enables A→B data flow; low enables B→A flow |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) and EMI in dense PCB layouts |
| Ioff partial-power-down | Enables safe operation during power sequencing without external isolation |
| TTL/CMOS mixed-voltage interface | Accepts TTL input levels while driving CMOS-compatible VOH/VOL |
| Matched rise/fall times | Minimizes skew across 8-bit data paths for clean parallel bus timing |
| High noise immunity | Input hysteresis (Vhys = 0.2 V) rejects transient coupling on shared buses |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Isolating CPU address/data bus from expansion slot peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow direction under microcontroller control. Use Value: Enables deterministic bus arbitration with 4.6-ns propagation delay and Ioff protection during module hot-swap. |
Use Scenario: Interfacing ISA-bus peripherals to modern FPGA-based controller cards in retro-computing upgrades. IC Role / Device Role / Timing Role: 8-bit bus buffer providing direction control and 3-state isolation between mismatched voltage domains. Use Value: Maintains signal integrity across long traces using edge-rate control and 64-mA drive for legacy TTL loads. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
Use Scenario: Dynamic reconfiguration of DUT signal paths in boundary-scan test systems with shared JTAG and data lines. IC Role / Device Role / Timing Role: Reconfigurable bus transceiver enabling multiplexed access to multiple device pins via T/R and OE. Use Value: Eliminates need for mechanical relays; 3-state outputs prevent bus contention during path switching. |
Use Scenario: Controlling parallel I/O lines between test sequencer and fixture-mounted sensors/actuators in production line testers. IC Role / Device Role / Timing Role: Robust bus driver handling noisy factory-floor environments with ESD-hardened I/O. Use Value: Survives repeated electrostatic discharge events (2000-V HBM) without latch-up or parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT245CTSOCT | SOIC-20 package, 4.1-ns max propagation delay, same drive strength and Ioff spec | Suitable for surface-mount PCBs requiring higher density and automated assembly | Select when board space or reflow compatibility is prioritized over through-hole serviceability |
| SN74FCT245ATPWR | TSSOP-20 package, identical electrical specs, RoHS-compliant NiPdAu finish | Preferred for compact portable instrumentation where thermal resistance (θJA = 68°C/W) matters | Choose for new designs targeting fine-pitch SMT processes and lower profile footprint |
Compared with CY74FCT245CTSOCT and SN74FCT245ATPWR, the CY74FCT245ATPC offers identical logic functionality and drive capability but provides through-hole mechanical robustness and simplified hand-soldering-critical for prototyping, repair, and low-volume industrial control panels.
Availability
CY74FCT245ATPC is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, test equipment signal routing, and automated test fixture control requiring stable component supply across extended product lifecycles.
Supply support for CY74FCT245ATPC 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 decades of heritage in high-reliability industrial and military-grade components.
The CY74FCT245ATPC belongs to TI's FCT logic family, engineered for noise-immune, high-drive bus interfacing in mission-critical industrial and aerospace systems where timing predictability and power sequencing safety are essential.
FAQ
What is the maximum clock/data rate supported by CY74FCT245ATPC?
The CY74FCT245ATPC has a maximum propagation delay of 4.6 ns (tPLH/tPHL), supporting reliable data transfer up to approximately 200 MHz in well-terminated, low-skew bus configurations. Its matched rise/fall times and edge-rate control ensure clean signal edges critical for synchronous bus protocols.
Does CY74FCT245ATPC support hot-swap or partial-power-down operation?
Yes, CY74FCT245ATPC incorporates Ioff circuitry that limits reverse current to ±1 µA when VCC = 0 V. This allows safe insertion/removal while other system rails remain active, making it suitable for modular backplanes and field-replaceable units where power sequencing must be managed independently.
Can CY74FCT245ATPC interface between 3.3-V and 5-V logic domains?
No - CY74FCT245ATPC is a 5-V-only device (VCC = 4.5–5.5 V) with TTL-compatible inputs and CMOS-level outputs. It does not tolerate 3.3-V supply or input voltages beyond absolute maximum ratings (–0.5 V to 7 V). For mixed-voltage translation, use dedicated level-shifters like TXB0108 or SN74AVCH series instead of CY74FCT245ATPC.
What is the function of the T/R and OE pins on CY74FCT245ATPC?
On CY74FCT245ATPC, T/R (pin 20) controls data direction: high enables A→B transfer, low enables B→A transfer. OE (pin 1) is active-high output enable - when high, both A and B ports enter high-impedance state, effectively disconnecting the device from both buses regardless of T/R state.
Is CY74FCT245ATPC pin-compatible with older 74LS245 or 74ALS245 devices?
Yes - CY74FCT245ATPC uses the industry-standard 20-pin DIP pinout matching 74LS245 and 74ALS245, including identical A/B port assignments, T/R, OE, VCC, and GND locations. However, it offers superior drive strength (64/32 mA vs. 24/15 mA), faster speed, and Ioff protection not present in LS/ALS families.
CY74FCT245ATPC 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CY74FCT245ATPC FAQ
1.How can I place an order for CY74FCT245ATPC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245ATPC 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 CY74FCT245ATPC reliable?
The price and inventory of CY74FCT245ATPC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245ATPC is usually 5 days.
3.What payment methods are accepted for CY74FCT245ATPC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245ATPC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT245ATPC?
CY74FCT245ATPC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245ATPC 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 CY74FCT245ATPC?
For technical support, including CY74FCT245ATPC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245ATPC requirements.
6.How does Aetrix verify that CY74FCT245ATPC is sourced from the original manufacturer or authorized distributors?
All CY74FCT245ATPC 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 CY74FCT245ATPC meets industry standards.
7.What is the process for return or replacement of CY74FCT245ATPC?
All CY74FCT245ATPC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245ATPC, 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 CY74FCT245ATPC part is unused and in its original packaging.
Return procedure for CY74FCT245ATPC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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