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Texas Instruments CY74FCT2245SOCT
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- Part No.:
- CY74FCT2245SOCT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CY74FCT2245SOCT.pdf
- Description:
- BUS TRANSCEIVER, FCT SERIES, 1 F
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
CY74FCT2245SOCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, 25-Ω output series resistors, Ioff partial-power-down support, and TTL-compatible logic levels. It operates at 4.75–5.25 V, delivers ±12 mA/±15 mA drive, and targets bus interface applications in industrial control backplanes and legacy data-path upgrades.
For engineers reviewing the CY74FCT2245SOCT datasheet, CY74FCT2245SOCT pinout, CY74FCT2245SOCT application, or CY74FCT2245SOCT equivalent, key selection factors include its 4.1 ns propagation delay (CY74FCT2245CT variant), 25-Ω integrated output termination, Ioff protection for hot-swap scenarios, and SOIC-20 package compatibility with legacy FCT-family layouts.
Technical Context
This device implements a dual-bus bidirectional transceiver architecture controlled by independent T/R (transmit/receive) and OE (output enable) inputs. The T/R signal determines data flow direction (A→B on high, B→A on low), while OE forces both ports into high-impedance state when asserted high.
It integrates edge-rate control circuitry and 25-Ω series output resistors to suppress transmission-line reflections, enabling direct replacement of CY74FCT245T in noise-sensitive systems. Ioff functionality disables outputs during power-down, preventing backflow current when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation across industrial-grade 5 V rails with ±5% tolerance. |
| Propagation Delay | 1.5–4.1 ns - Enables high-speed bus arbitration in sub-5 ns timing-critical data paths. |
| Output Drive | 12 mA sink / 15 mA source - Supports driving 50 Ω transmission lines and TTL loads without external buffers. |
| Output Termination | 25 Ω series resistor - Reduces signal reflections on PCB traces, eliminating need for discrete series resistors. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents damaging back-current during partial power-down or hot-insertion sequences. |
| ESD Protection | 2000-V HBM - Meets JEDEC JESD22-A114A for robust handling in manufacturing and field service. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial ambient conditions without derating. |
Pinout & Package
Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height per JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/R) | Direction Control Input | Active-high enables A→B data flow; active-low enables B→A - defines real-time bus arbitration polarity. |
| 2–9 (A0–A7) | Port A Bidirectional I/O | Noninverting data path pins tied to local bus segment; high-impedance when OE = high or VCC = 0. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; must be low-inductance connection for noise immunity. |
| 11 (VCC) | Power Supply | 5 V supply input with bypass capacitor requirement; powers internal logic and output drivers. |
| 12 (OE) | Output Enable Input | Active-high disables both A and B ports simultaneously - critical for bus contention avoidance. |
| 13–20 (B0–B7) | Port B Bidirectional I/O | Noninverting data path pins tied to remote bus segment; functionally identical to A-side with direction set by T/R. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω Output Series Resistors | Eliminates need for 16 external termination resistors in point-to-point or stubbed bus topologies. |
| Ioff Partial-Power-Down Protection | Prevents reverse current flow when VCC is unpowered, enabling safe insertion into live backplanes. |
| TTL-Compatible Input/Output Levels | Accepts standard TTL VIH/VIL thresholds and drives TTL loads directly - no level-shifting required. |
| Edge-Rate Controlled Outputs | Reduces simultaneous switching noise (SSN) and EMI emissions without sacrificing speed. |
| Function & Pinout Compatibility with FCT Family | Direct drop-in replacement for CY74FCT245T and other FCT2245 variants in existing PCB layouts. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing microcontroller peripherals to a multi-slot industrial backplane with daisy-chained 5 V buses. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing read/write handshaking between CPU and expansion cards via shared address/data bus. Use Value: 25-Ω series termination minimizes reflection-induced setup/hold violations on 15 cm trace runs; Ioff allows hot-swap of modules without system reset. | Use Scenario: Upgrading aging test equipment with obsolete 74ACT245-based data paths to reduce component count and improve noise margin. IC Role / Device Role / Timing Role: Pin-compatible replacement for CY74FCT245T in existing SOIC-20 footprints, preserving layout while adding integrated termination. Use Value: 4.1 ns propagation delay meets original timing budgets; TTL-compatible I/O eliminates redesign of upstream driver stages. |
| Automated Test Equipment (ATE) Signal Routing | Programmable Logic Controller (PLC) I/O Expansion |
Use Scenario: Multiplexing digital stimulus/response signals between FPGA-based pattern generators and DUT sockets in high-density ATE racks. IC Role / Device Role / Timing Role: Direction-controlled bus switch isolating test head channels from controller bus during parallel test execution. Use Value: 12 mA sink capability drives terminated 50 Ω coaxial cables; edge-rate control reduces crosstalk between adjacent channels operating at 25 MHz. | Use Scenario: Adding isolated digital I/O modules to modular PLC chassis where field wiring connects to local bus segments. IC Role / Device Role / Timing Role: Level-translating and noise-suppressing transceiver between CPU bus and opto-isolated I/O daughterboards. Use Value: –40°C to +85°C rating ensures reliability in cabinet-mounted environments; 2000-V HBM ESD withstands factory handling and field maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT245ATSOCT | Same SOIC-20 package, but lacks integrated 25-Ω output resistors and edge-rate control. | Requires external series termination resistors; higher SSN in dense routing. | Select only if cost sensitivity outweighs noise performance and board space constraints. |
| 74LVC245APWRE4 | 3.3 V only (1.65–3.6 V), 20-pin TSSOP, lower drive (24 mA sink), no Ioff. | Not suitable for 5 V legacy systems; requires level-shifting for mixed-voltage designs. | Choose only for new 3.3 V designs prioritizing low static power over 5 V interoperability. |
Compared with SN74FCT245ATSOCT and 74LVC245APWRE4, CY74FCT2245SOCT uniquely combines 5 V operation, integrated 25-Ω termination, Ioff, and FCT-family pin compatibility - making it the sole option for noise-critical, hot-swap-capable 5 V bus upgrades without layout change.
Availability
CY74FCT2245SOCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CY74FCT2245SOCT 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 industrial-grade product development.
CY74FCT2245SOCT belongs to the 74FCT logic family, engineered for high-speed, low-noise 5 V bus interfacing in industrial automation, test equipment, and communications infrastructure.
FAQ
What is the maximum propagation delay specification for CY74FCT2245SOCT at 5 V?
The CY74FCT2245SOCT has a maximum propagation delay of 4.1 ns (tPLH/tPHL) under recommended operating conditions (VCC = 4.75–5.25 V, TA = –40°C to +85°C). This value applies to the 'C' speed grade variant, which CY74FCT2245SOCT implements per TI's ordering nomenclature and datasheet SCCS037B revision November 2001.
Does CY74FCT2245SOCT support hot-swap operation?
Yes, CY74FCT2245SOCT supports hot-swap operation via its Ioff circuitry, which limits current to ±1 µA when VCC = 0 V and any I/O pin is biased to 4.5 V. This prevents damaging back-current flow during insertion into a live 5 V backplane - a key feature confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
What is the purpose of the 25-Ω output series resistors in CY74FCT2245SOCT?
The 25-Ω output series resistors in CY74FCT2245SOCT are integrated to dampen transmission-line reflections on PCB traces, reducing ringing and overshoot that cause timing violations. As stated in the datasheet description, this feature allows CY74FCT2245SOCT to replace CY74FCT245T without adding external termination components - directly improving signal integrity in bus-oriented applications.
Is CY74FCT2245SOCT pin-compatible with CY74FCT245T?
Yes, CY74FCT2245SOCT is functionally and pinout-compatible with CY74FCT245T, as explicitly stated in the datasheet's "Function and Pinout Compatible With FCT and F Logic" header and confirmed by identical SOIC-20 pin assignments (T/R, A0–A7, GND, VCC, OE, B0–B7). This enables drop-in replacement in existing designs without PCB modification.
What logic levels does CY74FCT2245SOCT accept and drive?
CY74FCT2245SOCT fully accepts and drives standard TTL logic levels: VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min), VOL ≤ 0.55 V (max at IOL = 12 mA), and VOH ≥ 2.4 V (min at IOH = –15 mA). These values are specified in the Recommended Operating Conditions and Electrical Characteristics sections of the TI datasheet SCCS037B.
CY74FCT2245SOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CY74FCT2245SOCT FAQ
1.How can I place an order for CY74FCT2245SOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2245SOCT 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 CY74FCT2245SOCT reliable?
The price and inventory of CY74FCT2245SOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245SOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2245SOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245SOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2245SOCT?
CY74FCT2245SOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2245SOCT 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 CY74FCT2245SOCT?
For technical support, including CY74FCT2245SOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245SOCT requirements.
6.How does Aetrix verify that CY74FCT2245SOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2245SOCT 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 CY74FCT2245SOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2245SOCT?
All CY74FCT2245SOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245SOCT, 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 CY74FCT2245SOCT part is unused and in its original packaging.
Return procedure for CY74FCT2245SOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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