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Texas Instruments CY74FCT240ATSOCT
- Part No.:
- CY74FCT240ATSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT240ATSOCT.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:380
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Product details
Overview
CY74FCT240ATSOCT from Texas Instruments is an octal noninverting 3-state buffer/line driver IC used for memory address driving, clock distribution, and bus transceiver applications. 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 CY74FCT240ATSOCT datasheet, CY74FCT240ATSOCT pinout, CY74FCT240ATSOCT application, or CY74FCT240ATSOCT equivalent, this page delivers verified electrical specs, SOIC-20 package details, noise-suppressing edge-rate control, and direct alternatives for bus interface design in industrial and embedded systems.
Technical Context
The CY74FCT240ATSOCT implements dual independent 4-bit noninverting buffers with active-low 3-state enable inputs (OEA, OEB). Each buffer pair drives one direction of an 8-bit bidirectional bus, with matched rise/fall times and edge-rate control circuitry to minimize switching noise.
It operates across –40°C to +85°C with VCC = 4.75–5.25 V, supports Ioff (≤±1 µA at VCC = 0 V), and meets JESD22 ESD ratings: 2000-V HBM, 200-V MM, 1000-V CDM - enabling safe hot-insertion and partial-power-down system architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.75–5.25 V - Ensures stable operation under industrial rail tolerances without external regulation. |
| Propagation Delay (tPLH/tPHL) | 1.5–8 ns - Enables high-speed bus buffering up to ~125 MHz clock domains with timing margin. |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - Drives heavy capacitive loads (e.g., >10 TTL units) without external buffers. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backflow current during partial power-down, protecting powered sections of mixed-voltage buses. |
| Input Threshold (VIH/VIL) | 2.0 V / 0.8 V - Fully compatible with standard TTL logic, eliminating level-shifting components. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets MIL-STD-883 Class 3001 requirements for ruggedized board-level reliability. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial environments including factory automation and telecom infrastructure. |
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 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low 3-state enable inputs - Simultaneously disable all eight outputs to high-impedance state for bus arbitration. |
| 2, 4, 6, 8, 11, 13, 15, 17 | DA0–DA3, DB0–DB3 | Data inputs - Accept TTL/NMOS/CMOS logic levels directly; no pull-ups required. |
| 3, 5, 7, 9, 12, 14, 16, 18 | OA0–OA3, OB0–OB3 | Noninverting buffered outputs - Provide low-impedance drive with controlled edge rates to reduce crosstalk. |
| 10 | GND | Ground reference - Dedicated ground pin minimizes ground bounce in high-speed switching. |
| 20 | VCC | Power supply - Single 5-V rail powers both input and output stages; decoupling recommended per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate control | Slows output transitions to suppress simultaneous switching noise (SSN) on shared PCB traces and power rails. |
| Ioff partial-power-down | Enables safe insertion/removal in live backplanes by disabling outputs when VCC = 0 V, preventing current backflow. |
| TTL-compatible I/O | Accepts and drives standard TTL voltage thresholds (VIH = 2.0 V, VOL = 0.55 V @ 64 mA), eliminating interface logic. |
| Matched tPLH/tPHL | Rise and fall times balanced within ±10% - critical for maintaining data eye integrity in synchronous bus timing. |
| High noise immunity | Input hysteresis (Vhys = 0.2 V) rejects transient noise on control lines like OEA/OEB in electrically noisy environments. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/ROM devices in a shared-memory architecture. IC Role / Device Role / Timing Role: Noninverting buffer isolating MCU address pins from bus capacitance; enables fanout to >8 devices with deterministic timing. Use Value: Eliminates address skew via matched propagation delays and prevents signal degradation using 64-mA drive capability. |
Use Scenario: Distributing a 25-MHz system clock to FPGA configuration logic, ADC sampling engine, and peripheral controllers. IC Role / Device Role / Timing Role: Low-skew clock driver with edge-rate control to minimize jitter accumulation across branches. Use Value: Maintains <100-ps inter-channel skew and reduces EMI emissions by limiting dV/dt on clock traces. |
| Bus Transceiver Interface | Industrial I/O Expansion |
Use Scenario: Bidirectional data transfer between a PLC CPU and modular I/O racks over a 24-V tolerant RS-485 backplane. IC Role / Device Role / Timing Role: Direction-controlled 3-state buffer enabling half-duplex data flow on shared D0–D7 lines. Use Value: Ioff support allows hot-swap of I/O modules without disrupting CPU power domain or inducing latch-up. |
Use Scenario: Isolating field-side digital inputs (limit switches, sensors) from a 3.3-V microcontroller in motor control cabinets. IC Role / Device Role / Timing Role: Level-shifting buffer translating 5-V industrial logic to MCU GPIO while suppressing EFT bursts. Use Value: 2000-V HBM ESD rating withstands repetitive electrostatic discharges common in factory-floor maintenance. |
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 |
|---|---|---|---|
| SN74FCT240ATPWR | Same FCT family, identical pinout and DC specs; 4.3-ns max tPLH (faster grade), SOIC-20 tape-and-reel. | Better suited for timing-critical clock distribution where sub-5-ns delay is mandatory. | Select when propagation delay budget is ≤4.5 ns and volume procurement favors TI's standard PWR suffix. |
| 74ACT240SCX | ACT logic family: higher ICC (1.2 mA typical), 5.5-V absolute max VCC, no Ioff, 24-mA IOL. | Lacks partial-power-down support; unsuitable for hot-plug or mixed-rail systems requiring Ioff. | Choose only for legacy ACT-based designs where Ioff and ESD robustness are not required. |
Compared with SN74FCT240ATPWR and 74ACT240SCX, the CY74FCT240ATSOCT offers optimal balance of industrial temperature range, Ioff safety, and noise-suppressed edge rates - making it preferred for bus arbitration in programmable logic controllers and embedded instrumentation.
Availability
CY74FCT240ATSOCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and industrial I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT240ATSOCT 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 validation.
The CY74FCT240ATSOCT belongs to the FCT logic family designed specifically for high-noise industrial and telecom environments, emphasizing robustness, bus compatibility, and partial-power-down safety.
FAQ
What is the maximum operating temperature for CY74FCT240ATSOCT?
The CY74FCT240ATSOCT is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per JEDEC JESD47 stress testing and supports deployment in industrial control panels, outdoor base stations, and factory automation equipment without derating.
Does CY74FCT240ATSOCT support hot-swap functionality?
Yes, CY74FCT240ATSOCT supports hot-swap via its Ioff feature: when VCC = 0 V, leakage current is limited to ±1 µA, preventing damaging backflow into powered system sections. This enables safe insertion/removal in live backplanes and modular I/O systems.
What is the output drive strength of CY74FCT240ATSOCT at 5 V supply?
At VCC = 4.75–5.25 V, CY74FCT240ATSOCT delivers 64-mA sink current (IOL) and 32-mA source current (IOH) per output. These values are guaranteed across temperature and ensure reliable driving of 10+ TTL loads or 50-pF transmission lines.
Is CY74FCT240ATSOCT pin-compatible with older 74FCT240 variants?
Yes, CY74FCT240ATSOCT uses the industry-standard SOIC-20 (DW) footprint and matches the pinout of CY74FCT240T, CY74FCT240CT, and SN74FCT240 series. No PCB redesign is needed when upgrading to the 'A' speed grade.
What ESD protection level does CY74FCT240ATSOCT meet?
CY74FCT240ATSOCT exceeds JESD22 standards: 2000-V Human-Body Model (HBM), 200-V Machine Model (MM), and 1000-V Charged-Device Model (CDM). These ratings are production-tested and ensure resilience against handling and system-level ESD events.
CY74FCT240ATSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
CY74FCT240ATSOCT FAQ
1.How can I place an order for CY74FCT240ATSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT240ATSOCT 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 CY74FCT240ATSOCT reliable?
The price and inventory of CY74FCT240ATSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT240ATSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT240ATSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT240ATSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT240ATSOCT?
CY74FCT240ATSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT240ATSOCT 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 CY74FCT240ATSOCT?
For technical support, including CY74FCT240ATSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT240ATSOCT requirements.
6.How does Aetrix verify that CY74FCT240ATSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT240ATSOCT 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 CY74FCT240ATSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT240ATSOCT?
All CY74FCT240ATSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT240ATSOCT, 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 CY74FCT240ATSOCT part is unused and in its original packaging.
Return procedure for CY74FCT240ATSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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