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Texas Instruments CY74FCT240TQCT
- Part No.:
- CY74FCT240TQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT240TQCT.pdf
- Description:
- IC BUF INVERT 5.25V 20SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
CY74FCT240TQCT from Texas Instruments is an octal 3-state noninverting buffer/line driver IC used for memory address driving, clock distribution, and bus transceiver applications. It delivers 64-mA sink / 32-mA source output drive, 8 ns max propagation delay (tPLH/tPHL), operates at 4.75–5.25 V, and supports partial-power-down via Ioff.
For engineers reviewing the CY74FCT240TQCT datasheet, CY74FCT240TQCT pinout, CY74FCT240TQCT application, or CY74FCT240TQCT equivalent, key selection criteria include 3-state bus isolation capability, TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), low-noise edge-rate control, and QSOP-20 packaging with −40°C to +85°C industrial temperature range.
Technical Context
The CY74FCT240TQCT implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), each gating four outputs. Its FCT-family architecture provides TTL-level compatibility while reducing power versus bipolar equivalents.
Edge-rate control circuitry limits dV/dt to suppress switching noise; Ioff protection disables outputs and limits reverse current when VCC = 0 V; matched rise/fall times ensure clean signal integrity in high-speed bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation across industrial rail tolerances without external regulation. |
| Output Sink Current | 64 mA per pin - Drives heavy capacitive loads (e.g., >10 TTL inputs) without signal degradation. |
| Output Source Current | 32 mA per pin - Sustains logic-high levels under significant fanout conditions. |
| Propagation Delay | ≤8 ns (tPLH/tPHL) - Enables reliable timing in 125-MHz bus systems with margin. |
| 3-State Enable Time | tPZH/tPZL ≤10 ns - Supports fast bus arbitration and dynamic line sharing. |
| Ioff Leakage | ±1 µA at VCC = 0 V - Prevents backfeed damage during hot-swap or partial-power-down sequences. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - Guarantees interoperability with standard TTL, CMOS, and NMOS logic families. |
Pinout & Package
Package: QSOP-20 (DBQ), 0.635 mm pitch, 7.2 mm × 5.3 mm body, 1.75 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 13, 15, 17, 19 | Input (DA0–DA3, DB0–DB3) | Data inputs for two independent 4-bit channels; TTL-compatible thresholds allow direct connection to legacy logic. |
| 3, 5, 7, 9, 14, 16, 18, 20 | Output (OA0–OA3, OB0–OB3) | Noninverting buffered outputs with 3-state control; capable of driving 50-pF loads at full speed. |
| 10 | GND | Ground reference for all I/O and internal logic; requires low-inductance PCB connection for noise immunity. |
| 20 | VCC | 5-V supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable switching. |
| 11 | OEA | Active-low enable for OA0–OA3 outputs; asserts 3-state when high, enables pass-through when low. |
| 12 | OEB | Active-low enable for OB0–OB3 outputs; allows independent control of two 4-bit data paths. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces EMI and crosstalk in dense PCB layouts by limiting slew rate without compromising propagation delay. |
| Ioff partial-power-down support | Enables safe insertion/removal in live backplanes and modular systems where VCC may be unpowered while other rails remain active. |
| TTL/CMOS/NMOS interoperability | Eliminates level-shifting components in mixed-technology systems, lowering BOM count and layout complexity. |
| Matched rise/fall times | Maintains symmetrical waveform edges, minimizing duty-cycle distortion in clock distribution networks. |
| ESD robustness | 2000-V HBM, 200-V MM, 1000-V CDM ratings exceed JEDEC standards for industrial handling and assembly. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with independent 3-state control isolates address latches during bus contention or standby. Use Value: 64-mA sink strength ensures full-rail voltage swing across 15-cm traces loaded with 30 pF, maintaining setup/hold margins at 20-MHz access rates. | Use Scenario: Bidirectional data routing between an FPGA and legacy parallel peripheral (e.g., printer port or ISA-style interface). IC Role / Device Role / Timing Role: Dual-channel 3-state line driver/receiver enabling direction-controlled data flow without external direction logic. Use Value: Independent OEA/OEB pins allow simultaneous enable of one channel for transmit while holding the other in high-Z for receive arbitration. |
| Clock Distribution Hub | Legacy System Signal Conditioning |
Use Scenario: Fanout of a 5-MHz system clock to six synchronous peripherals with matched skew. IC Role / Device Role / Timing Role: Low-skew, noninverting buffer delivering identical edge timing to all eight outputs. Use Value: Matched tPLH/tPHL (≤8 ns) and rise/fall symmetry limit inter-output skew to <1 ns, preserving clock phase integrity. | Use Scenario: Interfacing modern 3.3-V microcontrollers with legacy 5-V TTL peripherals (e.g., UART modems, LED displays). IC Role / Device Role / Timing Role: Level-tolerant buffer translating logic states while providing drive strength and noise immunity. Use Value: VIH/VIL thresholds (2.0 V / 0.8 V) accept 3.3-V logic highs as valid, and 64-mA drive overcomes TTL input loading without pull-ups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT240ATQCT | Same pinout, 4.8 ns max propagation delay (vs. 8 ns), higher speed grade; identical Ioff, drive, and voltage specs. | Suitable for timing-critical buses requiring <10 ns delay budget; not needed for general-purpose buffering. | Select SN74FCT240ATQCT only if system timing analysis confirms need for sub-5-ns propagation. |
| 74ACT240SCX | 5-V ACT family; 24-mA source / 24-mA sink (vs. 32/64 mA); no Ioff; 10.5 ns max delay; same QSOP-20 package. | Lacks partial-power-down protection; lower drive limits use in low-fanout or low-capacitance applications only. | Choose 74ACT240SCX only when Ioff is unnecessary and drive requirements are ≤24 mA per pin. |
Compared with SN74FCT240ATQCT and 74ACT240SCX, CY74FCT240TQCT offers optimal balance of industrial temperature range, robust 3-state isolation, high drive capability, and Ioff safety-making it preferred for bus-holding, hot-swap, and mixed-voltage legacy interfacing where reliability outweighs marginal speed gains.
Availability
CY74FCT240TQCT is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, clock distribution networks, and legacy system upgrades requiring stable component supply and long-term lifecycle support.
Supply support for CY74FCT240TQCT 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.
The CY74FCT240TQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible buffering in mission-critical industrial, telecom, and computing infrastructure.
FAQ
What is the maximum operating temperature range for CY74FCT240TQCT?
CY74FCT240TQCT is rated for −40°C to +85°C ambient operation, validated across its full electrical specification range including 64-mA output drive and 8 ns propagation delay. This industrial temperature grade supports deployment in factory automation controllers, outdoor communications equipment, and motor drive I/O modules without derating.
Does CY74FCT240TQCT support partial-power-down operation?
Yes, CY74FCT240TQCT includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature enables safe integration into hot-pluggable backplanes and modular systems where CY74FCT240TQCT may be powered down while adjacent logic remains active.
What package type and dimensions does CY74FCT240TQCT use?
CY74FCT240TQCT uses a QSOP-20 (DBQ) package: 7.2 mm × 5.3 mm body, 1.75 mm max height, 0.635 mm lead pitch. It is RoHS-compliant with NiPdAu lead finish and MSL Level-2-260°C-1 year, compatible with standard reflow profiles and automated SMT assembly.
How does CY74FCT240TQCT differ from CY54FCT240T in output drive capability?
CY74FCT240TQCT provides 64-mA sink / 32-mA source drive, whereas CY54FCT240T delivers 48-mA sink / 12-mA source. This 33% higher sink and 167% higher source capability makes CY74FCT240TQCT suitable for heavier bus loads, longer traces, or higher fanout without external buffers.
Can CY74FCT240TQCT directly interface with 3.3-V microcontrollers?
Yes - CY74FCT240TQCT accepts 3.3-V logic-high inputs as valid (VIH = 2.0 V min), and its 5-V supply ensures full-rail output swing. When driven by 3.3-V GPIO, CY74FCT240TQCT functions as a robust level translator and driver, eliminating need for discrete level shifters in mixed-voltage systems.
CY74FCT240TQCT 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:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
CY74FCT240TQCT FAQ
1.How can I place an order for CY74FCT240TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT240TQCT 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 CY74FCT240TQCT reliable?
The price and inventory of CY74FCT240TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT240TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT240TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT240TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT240TQCT?
CY74FCT240TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT240TQCT 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 CY74FCT240TQCT?
For technical support, including CY74FCT240TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT240TQCT requirements.
6.How does Aetrix verify that CY74FCT240TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT240TQCT 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 CY74FCT240TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT240TQCT?
All CY74FCT240TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT240TQCT, 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 CY74FCT240TQCT part is unused and in its original packaging.
Return procedure for CY74FCT240TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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