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Texas Instruments CY74FCT2245ATQCT
- Part No.:
- CY74FCT2245ATQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT2245ATQCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,456
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Product details
Overview
CY74FCT2245ATQCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus interface applications. It features 25-Ω output series resistors, Ioff partial-power-down support, ±1 µA Ioff current at VCC = 0 V, 4.6 ns max propagation delay (tPLH/tPHL), and operates across –40°C to +85°C. Used in industrial backplane data routing where noise immunity and hot-swap compatibility are critical.
For engineers reviewing the CY74FCT2245ATQCT datasheet, CY74FCT2245ATQCT pinout, CY74FCT2245ATQCT application, or CY74FCT2245ATQCT equivalent, this page delivers verified electrical specs, directional control logic, thermal resistance (θJA = 68°C/W), ESD ratings (2000-V HBM), and real-world bus isolation use cases - all confirmed against TI's SCCS037B revision November 2001 production data sheet.
Technical Context
The CY74FCT2245ATQCT implements TTL-compatible input thresholds (VIL = 0.8 V, VVIH = 2.0 V) and drives 12 mA sink / 15 mA source into 50-pF loads. Its edge-rate control circuitry limits dV/dt to suppress transmission-line reflections, while integrated 25-Ω series termination resistors eliminate external components on A/B ports.
Directional flow is controlled by the active-high T/R signal: high enables A→B transfer; low enables B→A. Output-enable (OE) is active-low - when high, both ports enter high-impedance state. Ioff protection actively disables outputs during power-down, blocking reverse current up to ±1 µA at VOUT = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - ensures stable operation under industrial rail tolerances without regulator headroom loss |
| Propagation Delay | Max 4.6 ns (tPLH/tPHL) - supports 100+ MHz bus clocking with deterministic timing margins |
| Output Drive | 12 mA sink / 15 mA source - sufficient to drive multiple FCT/TTL inputs without fanout degradation |
| Ioff Current | ±1 µA at VCC = 0 V - prevents backflow damage during live insertion or partial system shutdown |
| ESD Rating | 2000-V HBM - exceeds JEDEC JESD22-A114A for robust handling in manufacturing and field service |
| Thermal Resistance | θJA = 68°C/W (SSOP-20) - enables sustained 2.4 mA typical ICCD operation without heatsinking in 40°C ambient |
| Input Hysteresis | Vhys = 0.2 V - rejects noise on control lines (T/R, OE) in electrically noisy industrial environments |
Pinout & Package
SSOP-20 (DBQ) package: 7.4 mm × 5.3 mm body, 0.65 mm pitch, 1.2 mm max height, moisture sensitivity level 2 (260°C peak reflow). Gull-wing leads enable reliable automated assembly and visual solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/R) | Transmit/Receive Control | Active-high: enables A→B data flow; active-low: enables B→A - defines real-time bus directionality |
| 2–9 (A0–A7) | Port A Bidirectional I/O | Noninverting data path; internally terminated - connects to microcontroller or FPGA local bus |
| 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 - bypassing with 0.1 µF ceramic near pin required for noise suppression |
| 12 (OE) | Output Enable | Active-low: disables both A and B ports simultaneously into high-Z - essential for bus arbitration |
| 13–20 (B0–B7) | Port B Bidirectional I/O | Noninverting data path; matched 25-Ω series resistance - interfaces to legacy TTL peripherals or memory modules |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω Series Termination | Eliminates need for 16 external resistors - reduces PCB area, BOM count, and signal integrity risk from layout mismatch |
| Ioff Partial-Power-Down Protection | Prevents destructive current flow when VCC is unpowered but A/B buses remain live - enables safe hot-swap in modular systems |
| TTL-Compatible Logic Levels | Accepts standard 0.8 V / 2.0 V thresholds and delivers 2.4 V VOH min - ensures interoperability with legacy 74LS/74F devices |
| Edge-Rate Controlled Outputs | Slows transition times to limit EMI generation - meets Class B radiated emissions without added ferrites or shielding |
| 3-State Output Architecture | Simultaneous high-Z disable of all 16 I/Os via single OE pin - simplifies bus contention management in multi-master designs |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
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 A→B (CPU write) and B→A (peripheral read) transfers under OE-gated arbitration. Use Value: 4.6 ns propagation delay ensures setup/hold compliance at 20 MHz bus clocks; Ioff prevents backfeed during hot-plug module insertion. | Use Scenario: Extending a 74F245-based ISA bus to add new I/O cards without redesigning motherboard traces. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for CY74FCT245T with enhanced noise suppression and lower power. Use Value: Integrated 25-Ω resistors reduce reflection-induced bit errors on 15 cm trace runs; same 20-pin SSOP footprint avoids PCB rework. |
| Automated Test Equipment (ATE) Signal Routing | Programmable Logic Interposer |
Use Scenario: Multiplexing DUT signals between multiple test instruments using shared cabling infrastructure. IC Role / Device Role / Timing Role: Direction-controlled bus switch enabling instrument-to-DUT or DUT-to-instrument paths via T/R logic. Use Value: 0.2 V input hysteresis rejects switching noise from relay drivers; 2000-V HBM withstands ESD events during probe contact. | Use Scenario: Bridging FPGA I/O banks operating at different voltage domains (e.g., 3.3 V core ↔ 5 V peripheral). IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control synchronizing data flow between configurable logic blocks and external memory. Use Value: 12 mA sink capability drives 10+ TTL loads directly; OE pin allows seamless handoff between configuration and runtime modes. |
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 4.6 ns speed grade, TSSOP-20 (PW) package, θJA = 70°C/W, identical Ioff and ESD specs | 0.65 mm pitch vs. SSOP's 0.65 mm - identical lead spacing but thinner profile (1.2 mm vs. 1.75 mm height) | Select for space-constrained layouts requiring lowest Z-height; verify thermal derating at >50°C ambient due to higher θJA |
| 74AC245SCX | Higher speed (3.5 ns), wider VCC range (2–6 V), no integrated termination, Ioff not specified | CMOS input thresholds (1.5 V/3.5 V) - incompatible with TTL-level control signals without level translation | Choose only when full 2–6 V operation and sub-4 ns timing are mandatory; requires external 25-Ω resistors and separate Ioff mitigation |
Compared with SN74FCT245ATPWR, CY74FCT2245ATQCT offers identical timing and noise performance in a slightly taller but thermally superior SSOP package; versus 74AC245SCX, it provides guaranteed TTL compatibility, built-in termination, and Ioff protection - eliminating four design risks in industrial bus systems.
Availability
CY74FCT2245ATQCT is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy bus extension applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for CY74FCT2245ATQCT 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in industrial, automotive, and communications markets.
CY74FCT2245ATQCT belongs to the 74FCT family of fast CMOS logic devices engineered specifically for noise-immune, high-reliability bus interfacing in harsh industrial environments - emphasizing ESD robustness, power-down safety, and TTL interoperability.
FAQ
What is the maximum operating temperature range for CY74FCT2245ATQCT?
CY74FCT2245ATQCT is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by thermal characterization (θJA = 68°C/W) and electrical testing across the full span. The device maintains 4.6 ns max propagation delay and 12 mA output drive within this envelope.
Does CY74FCT2245ATQCT support hot-swap or partial-power-down operation?
Yes, CY74FCT2245ATQCT supports partial-power-down via its Ioff circuitry. When VCC = 0 V and any I/O pin is biased to 4.5 V, leakage is limited to ±1 µA - preventing damaging reverse current flow. This feature is explicitly characterized in the datasheet and enables safe insertion/removal in live-backplane systems without auxiliary protection circuitry.
How does the 25-Ω output series resistance in CY74FCT2245ATQCT improve signal integrity?
The 25-Ω on-die series resistors in CY74FCT2245ATQCT match typical PCB trace impedance (50–75 Ω) to dampen reflections at the driver end. This eliminates ringing and overshoot on unterminated stubs up to 15 cm, reducing bit errors in high-speed bus applications. Measured Rout = 20–40 Ω confirms consistent termination across process/voltage/temperature.
Can CY74FCT2245ATQCT replace CY74FCT245T in existing designs?
Yes - CY74FCT2245ATQCT is functionally and pinout-compatible with CY74FCT245T, as stated in TI's datasheet: "The CY74FCT2245T can replace the CY74FCT245T in an existing design." Both share identical pin mapping, logic behavior, and 3-state control. CY74FCT2245ATQCT adds improved noise characteristics and tighter propagation delay (4.6 ns vs. 4.1 ns for 'C' grade), making it a direct upgrade.
What are the absolute maximum ratings for CY74FCT2245ATQCT supply voltage and I/O pins?
CY74FCT2245ATQCT has an absolute maximum supply voltage of –0.5 V to +7 V, and DC input/output voltage range of –0.5 V to +7 V. These limits apply regardless of power state. Exceeding them risks permanent damage. Recommended operation remains 4.75–5.25 V for VCC, with inputs constrained to 0–5.25 V under normal bias conditions.
CY74FCT2245ATQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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-SSOP
CY74FCT2245ATQCT FAQ
1.How can I place an order for CY74FCT2245ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2245ATQCT 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 CY74FCT2245ATQCT reliable?
The price and inventory of CY74FCT2245ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2245ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2245ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2245ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2245ATQCT?
CY74FCT2245ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2245ATQCT 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 CY74FCT2245ATQCT?
For technical support, including CY74FCT2245ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2245ATQCT requirements.
6.How does Aetrix verify that CY74FCT2245ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2245ATQCT 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 CY74FCT2245ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2245ATQCT?
All CY74FCT2245ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2245ATQCT, 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 CY74FCT2245ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT2245ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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