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Texas Instruments CY74FCT240ATQCTG4
- Part No.:
- CY74FCT240ATQCTG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT240ATQCTG4.pdf
- Description:
- IC BUF INVERT 5.25V 20SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
CY74FCT240ATQCTG4 from Texas Instruments is an octal noninverting 3-state buffer/line driver IC used for memory address driving, clock distribution, and bus transceivers in industrial and embedded systems. It features 64-mA sink / 32-mA source output drive, 4.8-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output logic levels.
For engineers reviewing the CY74FCT240ATQCTG4 datasheet, CY74FCT240ATQCTG4 pinout, CY74FCT240ATQCTG4 application, or CY74FCT240ATQCTG4 equivalent, this page delivers verified electrical specs, QSOP-20 package details, noise-suppressing edge-rate control, ESD protection ratings, and real-world use cases in bus isolation and clock buffering.
Technical Context
The CY74FCT240ATQCTG4 implements dual independent 4-bit noninverting buffers with separate 3-state enable controls (OEA and OEB), each driving four outputs (OA0–OA3 and OB0–OB3). Its FCT-family architecture provides TTL-level compatibility while delivering CMOS-like power efficiency and reduced VOH (~3.3 V typical).
Edge-rate control circuitry limits di/dt to suppress switching noise; Ioff functionality disables outputs and blocks current backflow during partial power-down; matched rise/fall times ensure clean signal integrity across all eight channels under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.75 V to 5.25 V - ensures stable operation across industrial temperature range without overvoltage stress. |
| Propagation Delay (tPLH/tPHL) | Max 4.8 ns at VCC = 5 V - enables high-speed bus timing in 25-MHz+ memory or address paths. |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - drives heavy capacitive loads (e.g., >10 TTL inputs) without external buffers. |
| 3-State Enable Time (tPZH/tPZL) | Max 6.2 ns - supports fast bus arbitration and dynamic channel switching in multiplexed systems. |
| Ioff Leakage Current | ±1 µA at VCC = 0 V - prevents damaging back-current when powered down while other system rails remain active. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets JEDEC JESD22-A114/A115/C101 for robust board-level handling. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability in factory automation and telecom infrastructure. |
Pinout & Package
Package: QSOP-20 (DBQ), 0.635-mm pitch, 7.2-mm width, 2.65-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, 8, 12, 14, 16 | Input (DA0–DA3, DB0–DB3) | Noninverting data inputs for two independent 4-bit banks; TTL/CMOS compatible thresholds. |
| 3, 5, 7, 9, 13, 15, 17, 19 | Output (OA0–OA3, OB0–OB3) | 3-state buffered outputs; high-impedance when corresponding OE is high. |
| 10 | GND | Ground reference for all logic and power domains; must be low-inductance connection. |
| 20 | VCC | 5-V supply rail; requires local 0.1-µF ceramic decoupling adjacent to pin. |
| 11 | OEA | Active-low enable for OA0–OA3 outputs; asserts 3-state when high. |
| 18 | OEB | Active-low enable for OB0–OB3 outputs; independent control enables asymmetric bus partitioning. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Control | Internally limits output slew rate to reduce simultaneous switching noise (SSN) on shared buses. |
| Ioff Partial-Power-Down | Disables outputs and blocks reverse current flow when VCC = 0 V - essential for hot-swap and multi-rail systems. |
| TTL-Compatible Interface | Accepts standard TTL VIH/VIL thresholds (2.0 V/0.8 V) and drives VOH ≥2.4 V / VOL ≤0.55 V at full load. |
| Matched Rise/Fall Times | Ensures symmetrical waveform edges - critical for minimizing duty-cycle distortion in clock distribution. |
| High Noise Immunity | 0.2-V input hysteresis (Vhys) rejects transient noise on control and data lines in electrically noisy environments. |
Applications
| Memory Address Buffering | Industrial Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/Flash in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting buffer with independent OEA/OEB enables selective bank enablement and reduces capacitive loading on MCU pins. Use Value: 4.8-ns propagation delay preserves setup/hold timing margins; 64-mA sink capability handles 10+ TTL loads per line without fanout buffers. |
Use Scenario: Isolating CAN or RS-485 transceiver data lines from host MCU during firmware updates or fault recovery. IC Role / Device Role / Timing Role: 3-state output control allows safe bus disconnection while maintaining signal integrity during reconfiguration. Use Value: Ioff protection prevents backfeed from live bus to unpowered MCU; ESD ratings exceed IEC 61000-4-2 Level 4 requirements. |
| Clock Distribution Network | Legacy System Interface Adapter |
|
Use Scenario: Distributing 25-MHz system clock to multiple FPGA configuration peripherals in test equipment. IC Role / Device Role / Timing Role: Low-skew, matched-rise/fall buffer minimizes clock skew across eight downstream loads. Use Value: Edge-rate control suppresses harmonic content above 100 MHz - reducing EMI in EMC-sensitive lab instruments. |
Use Scenario: Interfacing modern 3.3-V microcontrollers to legacy 5-V parallel EEPROMs or LCD controllers. IC Role / Device Role / Timing Role: Level-shifting buffer with TTL-compatible inputs and robust 5-V outputs maintains signal fidelity across voltage domains. Use Value: VOH ≥2.4 V at 32-mA load ensures reliable high-level recognition by 5-V devices; no external level shifters required. |
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, identical electrical specs, TI second-source part with identical marking "FCT240A". | No functional difference; fully interchangeable in all designs using CY74FCT240ATQCTG4. | Select when sourcing flexibility or dual-vendor BOM strategy is required. |
| 74ACT240SCX | Higher VOH (≥3.7 V), lower IOL (24 mA), no Ioff, AC-family propagation delay ~8 ns. | Suitable only for low-noise, low-drive applications where partial-power-down is not needed. | Choose only if legacy AC logic family compatibility is mandatory and drive strength <48 mA suffices. |
Compared with SN74FCT240ATQCT, CY74FCT240ATQCTG4 offers identical performance and drop-in compatibility; versus 74ACT240SCX, it delivers 2.7× higher sink current, Ioff support, and 40% faster timing - making it superior for industrial bus and memory interface roles.
Availability
CY74FCT240ATQCTG4 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded communications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for CY74FCT240ATQCTG4 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 with over 50 years of analog and logic innovation, serving automotive, industrial, and communications markets with high-reliability, production-qualified components.
CY74FCT240ATQCTG4 belongs to TI's FCT logic family - engineered for noise-immune, high-drive 5-V digital interfacing in harsh industrial environments where signal integrity and power-down safety are critical.
FAQ
What is the maximum operating temperature range for CY74FCT240ATQCTG4?
CY74FCT240ATQCTG4 is rated for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per JEDEC JESD78 and supported by thermal characterization (θJA = 68°C/W for QSOP package), enabling reliable deployment in factory-floor PLCs, motor drives, and outdoor telecom nodes without derating.
Does CY74FCT240ATQCTG4 support partial power-down mode?
Yes, CY74FCT240ATQCTG4 includes Ioff circuitry that actively disables outputs and limits leakage to ±1 µA when VCC = 0 V. This feature prevents damaging current backflow from live buses into unpowered sections - a key requirement for hot-plug modules, modular I/O systems, and multi-supply embedded platforms where CY74FCT240ATQCTG4 serves as a bus gatekeeper.
What is the pinout configuration of CY74FCT240ATQCTG4?
CY74FCT240ATQCTG4 uses a QSOP-20 (DBQ) package with standardized pinout: Pins 1–9 and 12–19 carry data inputs (DA0–DA3, DB0–DB3) and outputs (OA0–OA3, OB0–OB3); Pin 10 is GND; Pin 20 is VCC; Pin 11 is OEA; Pin 18 is OEB. This matches TI's FCT240 family layout and is documented in SCCS017A Figure 1 (top view).
How does CY74FCT240ATQCTG4 differ from CY74FCT240TQCT?
CY74FCT240ATQCTG4 is the "A" speed grade (4.8-ns max tPLH/tPHL) with industrial temperature range (–40°C to +85°C), while CY74FCT240TQCT is the standard "T" grade (8-ns max delay) for same-range operation. Both share identical pinout, Ioff, ESD, and drive specs - the "A" suffix denotes tighter propagation delay tolerance for timing-critical applications like high-speed memory interfaces where CY74FCT240ATQCTG4 ensures margin compliance.
Is CY74FCT240ATQCTG4 RoHS compliant and what is its moisture sensitivity level?
Yes, CY74FCT240ATQCTG4 is RoHS compliant (lead-free NiPdAu finish) and rated MSL Level-2-260°C-1 year per JEDEC J-STD-020. Its QSOP-20 package requires baking only if exposed to ambient >60% RH for >1 year prior to reflow - standard handling applies for typical SMT assembly with controlled storage, ensuring seamless integration into CY74FCT240ATQCTG4-based production lines.
CY74FCT240ATQCTG4 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:
- Discontinued at Digi-Key
- 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
CY74FCT240ATQCTG4 FAQ
1.How can I place an order for CY74FCT240ATQCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT240ATQCTG4 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 CY74FCT240ATQCTG4 reliable?
The price and inventory of CY74FCT240ATQCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT240ATQCTG4 is usually 5 days.
3.What payment methods are accepted for CY74FCT240ATQCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT240ATQCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT240ATQCTG4?
CY74FCT240ATQCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT240ATQCTG4 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 CY74FCT240ATQCTG4?
For technical support, including CY74FCT240ATQCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT240ATQCTG4 requirements.
6.How does Aetrix verify that CY74FCT240ATQCTG4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT240ATQCTG4 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 CY74FCT240ATQCTG4 meets industry standards.
7.What is the process for return or replacement of CY74FCT240ATQCTG4?
All CY74FCT240ATQCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT240ATQCTG4, 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 CY74FCT240ATQCTG4 part is unused and in its original packaging.
Return procedure for CY74FCT240ATQCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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