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Texas Instruments CY74FCT240CTQCTG4
- Part No.:
- CY74FCT240CTQCTG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT240CTQCTG4.pdf
- Description:
- IC BUF INVERT 5.25V 20SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,859
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Product details
Overview
CY74FCT240CTQCTG4 from Texas Instruments is an octal noninverting 3-state buffer/line driver IC used for memory address and clock distribution, bus interfacing, and TTL-compatible signal conditioning. It features 64-mA sink / 32-mA source output drive, 4.3-ns maximum propagation delay, Ioff partial-power-down support, and edge-rate control for noise reduction.
For engineers reviewing the CY74FCT240CTQCTG4 datasheet, CY74FCT240CTQCTG4 pinout, CY74FCT240CTQCTG4 application, or CY74FCT240CTQCTG4 equivalent, key selection criteria include 3-state bus driving capability, TTL-level compatibility, industrial temperature range (–40°C to 85°C), SOIC-20 package footprint, and low-noise edge-controlled outputs.
Technical Context
The CY74FCT240CTQCTG4 implements dual independent 4-bit noninverting buffers with active-low 3-state enable inputs (OEA and OEB). Each buffer pair drives one direction of a bidirectional data path, supporting high-speed bus transceiver operation without inversion.
Its FCT-family architecture delivers TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and CMOS-like output swing (VOH = 3.3 V typ at VCC = 5 V), while edge-rate control circuitry limits di/dt to suppress simultaneous switching noise in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation across standard 5-V supply tolerances. |
| Propagation Delay | 4.3 ns max (tPLH/tPHL) - Enables reliable timing in 100+ MHz bus systems. |
| Output Drive | 64 mA sink / 32 mA source - Drives heavy capacitive loads (e.g., >10 TTL inputs or 50-pF traces). |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backflow during hot-insertion or partial power-down. |
| ESD Rating | 2000-V HBM - Meets industrial robustness requirements without external protection. |
| Operating Temp | –40°C to +85°C - Qualified for commercial and industrial ambient environments. |
| Input Compatibility | TTL, NMOS, CMOS logic levels - Interfaces directly without level-shifting components. |
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, 19 | OEA, OEB | Active-low 3-state enables - Independently disable each 4-bit buffer group. |
| 2, 4, 6, 8, 11, 13, 15, 17 | DA0–DA3, DB0–DB3 | Data inputs - Accept TTL/CMOS logic; no internal pull-ups. |
| 3, 5, 7, 9, 12, 14, 16, 18 | OA0–OA3, OB0–OB3 | Noninverting 3-state outputs - High-impedance when corresponding OE is high. |
| 10 | GND | Ground reference - Must be low-inductance connection for noise control. |
| 20 | VCC | Power supply - Requires local 0.1-µF ceramic decoupling per device. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting slew rate without sacrificing speed. |
| Ioff partial-power-down | Enables safe operation in mixed-voltage or hot-swap systems where VCC may be unpowered. |
| Matched rise/fall times | Minimizes duty-cycle distortion on clock or data signals routed through the buffer. |
| 3.3-V typical VOH | Provides margin for TTL-high detection while reducing dynamic power vs. standard 5-V FCT. |
| 200-V machine model ESD | Supports automated handling and board assembly without special static controls. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing fanout and isolation between controller and memory devices. Use Value: 64-mA sink current ensures clean signal edges into 100-pF total load; Ioff prevents backfeed when memory is powered off. | Use Scenario: Bidirectional data transfer between two isolated 8-bit microcontrollers via a common PCB trace bus. IC Role / Device Role / Timing Role: Dual 4-bit buffer enabling direction-controlled data flow with minimal propagation skew. Use Value: Matched tPLH/tPHL (≤4.3 ns) maintains data setup/hold integrity; edge-rate control suppresses crosstalk on adjacent traces. |
| Legacy System Clock Distribution | TTL-to-CMOS Interface |
Use Scenario: Distributing a 25-MHz system clock from a crystal oscillator to multiple legacy peripherals with TTL inputs. IC Role / Device Role / Timing Role: Low-skew clock driver with 3-state capability for dynamic clock gating. Use Value: 4.3-ns max delay and matched rise/fall times preserve clock jitter budget; VOH = 3.3 V meets TTL VIH min with margin. | Use Scenario: Interfacing a 5-V CMOS FPGA I/O bank to legacy 5-V TTL logic on the same board. IC Role / Device Role / Timing Role: Level-translation buffer ensuring compatible voltage thresholds without external resistors. Use Value: Direct TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V) and CMOS-like outputs eliminate need for pull-up networks or discrete translators. |
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 |
|---|---|---|---|
| SN74FCT240CTSOCT | Same FCT family, identical pinout and specs; TI rebranded part number with identical DW package and marking. | No functional difference; used interchangeably in new designs and BOM updates. | Select when sourcing from distributors listing SN74FCT240CTSOCT as active stock. |
| 74AC240SCX | Higher VOH (4.5 V min), slower delay (10 ns), no Ioff or edge-rate control; SOIC-20 but AC logic family. | Suitable only for static 5-V systems without hot-swap or noise-sensitive routing. | Choose only if legacy AC-series qualification is required and noise immunity is not critical. |
Compared with SN74FCT240CTSOCT, CY74FCT240CTQCTG4 offers identical performance and drop-in compatibility; versus 74AC240SCX, it provides superior noise control, Ioff safety, and faster timing-critical for modern industrial bus designs.
Availability
CY74FCT240CTQCTG4 is available at Aetrix Electronics and suitable for memory subsystems, industrial PLC backplanes, legacy bus interfaces, and clock distribution networks requiring stable component supply over extended production lifecycles.
Supply support for CY74FCT240CTQCTG4 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 component development.
CY74FCT240CTQCTG4 belongs to the FCT logic family, designed specifically for high-drive, low-noise, TTL-compatible buffering in mission-critical industrial and communications infrastructure.
FAQ
What is the maximum operating frequency supported by CY74FCT240CTQCTG4?
CY74FCT240CTQCTG4 does not specify a maximum clock frequency in its datasheet because it is a combinational buffer-not a registered device. Its usable frequency limit depends on propagation delay (4.3 ns max) and load capacitance. For a 50-pF load, it reliably supports data rates up to ~100 MHz in point-to-point configurations, assuming proper termination and layout.
Does CY74FCT240CTQCTG4 support hot-swap or partial-power-down operation?
Yes, CY74FCT240CTQCTG4 supports partial-power-down via its Ioff feature. When VCC = 0 V, Ioff limits current flow to ±1 µA even if input/output pins are biased to 4.5 V-enabling safe insertion into live backplanes or operation in mixed-supply systems where other devices remain powered.
What is the meaning of the "G4" suffix in CY74FCT240CTQCTG4?
The "G4" suffix in CY74FCT240CTQCTG4 indicates Green (RoHS-compliant) packaging with NiPdAu lead finish and tape-and-reel delivery (2000 units per reel) in SOIC-20 (DW) package. It is functionally identical to CY74FCT240CTQCT but reflects TI's standardized eco-labeling convention.
Can CY74FCT240CTQCTG4 drive multiple TTL inputs directly?
Yes, CY74FCT240CTQCTG4 can drive up to 10 standard TTL inputs per output due to its 64-mA sink capability and 32-mA source rating. This exceeds the 1.6-mA per TTL input requirement, providing ample margin for trace capacitance and voltage drop across PCB interconnects.
Is CY74FCT240CTQCTG4 pin-compatible with older CY74FCT240T variants?
Yes, CY74FCT240CTQCTG4 is fully pin-compatible with all CY74FCT240x variants in SOIC-20 (DW) package-including CY74FCT240T, CY74FCT240AT, and CY74FCT240CT-sharing identical pinout, footprint, and electrical interface. Only timing and drive strength differ across speed grades.
CY74FCT240CTQCTG4 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:
- Obsolete
- 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
CY74FCT240CTQCTG4 FAQ
1.How can I place an order for CY74FCT240CTQCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT240CTQCTG4 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 CY74FCT240CTQCTG4 reliable?
The price and inventory of CY74FCT240CTQCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT240CTQCTG4 is usually 5 days.
3.What payment methods are accepted for CY74FCT240CTQCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT240CTQCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT240CTQCTG4?
CY74FCT240CTQCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT240CTQCTG4 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 CY74FCT240CTQCTG4?
For technical support, including CY74FCT240CTQCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT240CTQCTG4 requirements.
6.How does Aetrix verify that CY74FCT240CTQCTG4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT240CTQCTG4 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 CY74FCT240CTQCTG4 meets industry standards.
7.What is the process for return or replacement of CY74FCT240CTQCTG4?
All CY74FCT240CTQCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT240CTQCTG4, 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 CY74FCT240CTQCTG4 part is unused and in its original packaging.
Return procedure for CY74FCT240CTQCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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