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Texas Instruments CY74FCT2245TSOC
- Part No.:
- CY74FCT2245TSOC
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2245TSOC.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:650
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Product details
Overview
CY74FCT2245TSOC from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data transfer between two TTL-compatible buses. It features 25-Ω output series resistors to suppress transmission-line reflections, Ioff support for partial-power-down operation, and operates at 4.75–5.25 V with 7 ns max propagation delay. It is used in legacy industrial control backplanes requiring noise-immune level translation.
For engineers reviewing the CY74FCT2245TSOC datasheet, CY74FCT2245TSOC pinout, CY74FCT2245TSOC application, or CY74FCT2245TSOC equivalent, key selection criteria include its 12 mA sink / 15 mA source drive strength, SOIC-20 package thermal resistance (58°C/W), 3-state enable timing (tPZH/tPZL ≤ 9.5 ns), and compatibility with FCT/F logic families in mixed-voltage bus isolation scenarios.
Technical Context
The CY74FCT2245TSOC implements a dual-bus bidirectional transceiver architecture controlled by independent T/R (transmit/receive) and OE (output enable) inputs. Its edge-rate control circuitry shapes output transitions to reduce EMI, while integrated 25-Ω series termination resistors minimize signal reflections without external components.
It supports true partial-power-down via Ioff protection, disabling outputs and blocking current flow when VCC = 0 V. Input thresholds are TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and output levels meet TTL VOH ≥ 2.4 V and VOL ≤ 0.55 V under full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation across industrial power rails with ±5% tolerance. |
| Propagation Delay | 1.5–7 ns - Enables reliable 140+ MHz bus operation with deterministic timing margins. |
| Output Drive | 12 mA sink / 15 mA source - Sufficient to drive 50-pF loads across 15-cm PCB traces without waveform degradation. |
| 3-State Enable Time | tPZH/tPZL ≤ 9.5 ns - Guarantees fast bus release for time-critical arbitration protocols. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Directly interfaces with standard TTL outputs without level-shifting circuitry. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets JEDEC JESD22-A114/A115/C101 for robust handling in manufacturing environments. |
| Thermal Resistance | θJA = 58°C/W (SOIC) - Supports continuous operation at 85°C ambient with minimal derating. |
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 direction. |
| 2–9 (A0–A7) | Port A bidirectional I/O | Connects to local subsystem bus; driven high/low or tri-stated based on T/R and OE state. |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection. |
| 11 (VCC) | Power supply | 5-V nominal supply; decoupling capacitor required within 1 cm for noise suppression. |
| 12 (OE) | Output enable input | High = both ports forced into high-impedance; essential for bus contention avoidance. |
| 13–20 (B0–B7) | Port B bidirectional I/O | Connects to remote bus segment; electrically isolated from Port A except during active transfer. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 25-Ω series termination | Eliminates need for 16 external 25-Ω resistors, reducing BOM count and PCB area in parallel bus designs. |
| Ioff partial-power-down protection | Prevents backflow current when VCC = 0 V, enabling safe hot-insertion in modular backplane systems. |
| TTL-compatible input/output levels | Direct drop-in replacement for 74LS245 and 74F245 without interface logic or voltage translators. |
| Edge-rate controlled outputs | Reduces spectral energy above 100 MHz, easing EMC compliance in industrial enclosures without added filtering. |
| Function and pinout compatibility with FCT/F logic | Enables direct substitution in existing FCT245-based designs with no layout or firmware changes required. |
Applications
| Industrial Backplane Bus Isolation | Legacy System Bus Translation |
|---|---|
Use Scenario: Isolating CPU and peripheral modules on a 20-slot Eurocard rack where each slot draws independent power and may be hot-swapped. IC Role / Device Role / Timing Role: Bidirectional data bridge between isolated 5-V TTL buses, enabling synchronous read/write cycles with sub-10 ns enable/disable latency. Use Value: Prevents bus contention during module insertion/removal using Ioff and 3-state control, eliminating system resets. | Use Scenario: Upgrading a 1990s CNC controller's mainboard to replace aging 74F245 transceivers without redesigning the PCB layout. IC Role / Device Role / Timing Role: Pin-compatible 8-bit transceiver providing identical logic function and timing behavior as original part. Use Value: Maintains exact tPLH/tPHL ≤ 7 ns and VOH/VOL specs, ensuring unchanged timing closure in legacy timing budgets. |
| Automotive Diagnostic Interface | Test Equipment Data Multiplexing |
Use Scenario: Interfacing a microcontroller-based diagnostic tool with multiple vehicle ECUs over shared K-Line and CAN-L lines in service bay equipment. IC Role / Device Role / Timing Role: Bidirectional level translator and bus isolator between MCU GPIO and legacy automotive serial buses. Use Value: 25-Ω series resistors suppress reflections on long cable runs, improving signal integrity at 10.4 kbps K-Line rates. | Use Scenario: Routing test signals between DUT (device under test) and ATE (automatic test equipment) in semiconductor final test handlers. IC Role / Device Role / Timing Role: High-speed bidirectional data switch enabling shared probe access across multiple DUT sites. Use Value: 12 mA sink capability drives heavy capacitive loads of test fixture wiring, maintaining clean edges up to 10 MHz toggle rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT2245ATSOC | 4.6 ns max propagation delay vs. 7.0 ns; otherwise identical pinout, package, and electrical specs. | Suitable for higher-speed bus segments where tighter timing margins are required. | Select CY74FCT2245ATSOC when design requires <7 ns tPLH/tPHL; same footprint and thermal profile. |
| SN74F245N | No on-chip 25-Ω termination; higher output impedance; no Ioff protection; 10 ns typical delay. | Limited to static-powered systems without hot-swap requirements. | Use SN74F245N only in cost-sensitive, non-hot-swap applications where external termination is acceptable. |
Compared with CY74FCT2245ATSOC, the CY74FCT2245TSOC trades 2.4 ns slower propagation for broader availability and lower unit cost; versus SN74F245N, it adds critical Ioff and integrated termination-enabling safer, cleaner bus operation in modern industrial upgrades.
Availability
CY74FCT2245TSOC is available at Aetrix Electronics and suitable for industrial backplane isolation, legacy system bus translation, and automotive diagnostic interface applications requiring stable component supply across extended product lifecycles.
Supply support for CY74FCT2245TSOC 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 since 1930.
The CY74FCT2245TSOC belongs to TI's FCT logic family, engineered specifically for noise-immune, high-drive bus interfacing in mission-critical industrial control and instrumentation systems operating from –40°C to +85°C.
FAQ
What is the maximum operating temperature range for the CY74FCT2245TSOC?
The CY74FCT2245TSOC is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by thermal resistance (θJA = 58°C/W) and power dissipation limits. The device maintains full electrical performance-including 12 mA sink drive and 7 ns propagation delay-across this entire industrial temperature range.
Does the CY74FCT2245TSOC support hot-swap or partial-power-down operation?
Yes, the CY74FCT2245TSOC supports partial-power-down operation via its Ioff circuitry. When VCC = 0 V, the Ioff feature disables all outputs and blocks damaging current backflow from live buses into the unpowered device. This enables safe hot-insertion in modular backplane systems, as 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 the CY74FCT2245TSOC?
The 25-Ω output series resistors in the CY74FCT2245TSOC are integrated to match typical PCB trace impedances and suppress transmission-line reflections. As verified in the "Electrical Characteristics" table (Rout = 20–40 Ω), they eliminate the need for 16 discrete external resistors, reduce signal ringing on long parallel buses, and improve noise immunity-especially in industrial backplane applications with >15 cm trace lengths.
Is the CY74FCT2245TSOC pin-compatible with the 74F245 or 74LS245?
Yes, the CY74FCT2245TSOC is functionally and pinout-compatible with the 74F245 and 74LS245. Its SOIC-20 footprint matches these legacy devices, and its TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive levels allow direct substitution. However, unlike those parts, CY74FCT2245TSOC adds Ioff and on-chip termination-enhancing reliability without altering pin assignments.
What are the key timing parameters that define bus arbitration behavior in the CY74FCT2245TSOC?
The key timing parameters governing bus arbitration in the CY74FCT2245TSOC are tPZH and tPZL (≤ 9.5 ns), which define how quickly outputs enter high-impedance after OE goes high, and tPHZ/tPLZ (≤ 7.5 ns), which define how quickly outputs exit high-impedance after OE goes low. These values ensure rapid bus release and acquisition-critical for multi-master arbitration in industrial backplanes-and are measured under standard 50-pF load conditions per the switching characteristics table.
CY74FCT2245TSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CY74FCT2245TSOC FAQ
1.How can I place an order for CY74FCT2245TSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2245TSOC 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 CY74FCT2245TSOC reliable?
The price and inventory of CY74FCT2245TSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245TSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT2245TSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245TSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2245TSOC?
CY74FCT2245TSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2245TSOC 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 CY74FCT2245TSOC?
For technical support, including CY74FCT2245TSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245TSOC requirements.
6.How does Aetrix verify that CY74FCT2245TSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT2245TSOC 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 CY74FCT2245TSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT2245TSOC?
All CY74FCT2245TSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245TSOC, 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 CY74FCT2245TSOC part is unused and in its original packaging.
Return procedure for CY74FCT2245TSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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