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Texas Instruments CY74FCT240ATSOC
- Part No.:
- CY74FCT240ATSOC
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT240ATSOC.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,545
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Product details
Overview
CY74FCT240ATSOC from Texas Instruments is an octal noninverting 3-state buffer/line driver IC used for memory address driving, clock distribution, and bus-oriented data transmission. It features 64-mA sink / 32-mA source output drive, 4.8-ns maximum propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output voltage levels.
For engineers reviewing the CY74FCT240ATSOC datasheet, CY74FCT240ATSOC pinout, CY74FCT240ATSOC application, or CY74FCT240ATSOC equivalent, key selection criteria include 3-state bus isolation capability, industrial temperature range (–40°C to +85°C), SOIC-20 package thermal performance (θJA = 58°C/W), and compatibility with legacy FCT logic families.
Technical Context
The CY74FCT240ATSOC implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), enabling selective bus partitioning. Its edge-rate control circuitry reduces switching noise while maintaining matched rise/fall times and full TTL-level interoperability.
It supports partial-power-down via Ioff, which disables outputs and limits reverse current to ±1 µA when VCC = 0 V. Absolute maximum ratings include –0.5 V to 7 V on all I/O pins and supply, ensuring robustness against overvoltage transients in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.75 V to 5.25 V - ensures stable operation across industrial-grade power rails with ±2.5% tolerance. |
| Propagation Delay (tPLH/tPHL) | Max 8 ns - enables reliable timing in high-speed address/data buses up to ~125 MHz system clock domains. |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - drives heavy capacitive loads (e.g., >10 TTL inputs or long PCB traces) without external buffering. |
| 3-State Enable Time (tPZH/tPZL) | Max 10 ns - provides fast bus arbitration and clean signal isolation during dynamic bus sharing. |
| Ioff Current | ±1 µA at VCC = 0 V - prevents backflow damage when hot-plugging or sequencing power in multi-rail systems. |
| Input Thresholds (VIH/VIL) | 2.0 V min VIH / 0.8 V max VIL - guarantees unambiguous TTL-level recognition without level-shifting components. |
| Operating Temperature | –40°C to +85°C - qualified for 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 (OEA) | Output Enable A | Active-low enable for first 4-channel buffer group (OA0–OA3); asserts 3-state when high. |
| 2 (DA0) | Data Input A0 | Noninverting input for OA0 output; directly interfaces TTL/NMOS/CMOS logic without pull-ups. |
| 3 (OA0) | Output A0 | Noninverting buffered output with 64-mA sink capability; electrically isolated when OEA or OEB high. |
| 4 (DA1) | Data Input A1 | Noninverting input for OA1; shares same enable domain as DA0–DA3 under OEA control. |
| 5 (OA1) | Output A1 | Noninverting output with matched rise/fall times; supports noise-sensitive clock distribution. |
| 6 (DA2) | Data Input A2 | Input for third buffer in A-group; compatible with 0.8 V/2.0 V TTL thresholds. |
| 7 (OA2) | Output A2 | High-drive output supporting memory address lines with low VOL (0.3 V typical at 64 mA). |
| 8 (DA3) | Data Input A3 | Final input of A-group; enables compact 4-bit parallel interface design. |
| 9 (OA3) | Output A3 | Terminating output of A-group; fully specified for simultaneous switching noise (SSN) mitigation. |
| 10 (GND) | Ground | Primary reference for all I/O and internal logic; requires low-impedance PCB plane connection. |
| 11 (VCC) | Power Supply | +5 V nominal supply; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin. |
| 12 (OEB) | Output Enable B | Active-low enable for second 4-channel group (OB0–OB3); independent of OEA for flexible bus segmentation. |
| 13 (OA0) | Output B0 | Noninverting output for DB0 input; identical electrical specs to OA0 but controlled by OEB. |
| 14 (DB0) | Data Input B0 | Input for OB0; allows bidirectional bus configuration when paired with complementary drivers. |
| 15 (OA1) | Output B1 | Second output of B-group; supports differential signaling pairs when combined with adjacent channels. |
| 16 (DB1) | Data Input B1 | Input for OB1; enables synchronous 8-bit latch-free data forwarding. |
| 17 (OA2) | Output B2 | Third B-group output; characterized for ESD robustness (2000-V HBM, 200-V MM, 1000-V CDM). |
| 18 (DB2) | Data Input B2 | Input for OB2; supports hot-swap initialization sequences via Ioff-enabled isolation. |
| 19 (OA3) | Output B3 | Final B-group output; matches A-group timing (tPLH/tPHL ≤ 8 ns) for skew-critical applications. |
| 20 (DB3) | Data Input B3 | Input for OB3; completes full 8-bit dual-bank architecture with independent enable control. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate control | Reduces simultaneous switching noise (SSN) by limiting dV/dt without sacrificing propagation speed. |
| Ioff partial-power-down | Enables safe operation during power sequencing or standby modes with <±1 µA leakage at VCC = 0 V. |
| TTL-compatible I/O | Accepts standard TTL VIH (≥2.0 V) and VIL (≤0.8 V); drives VOH ≥2.4 V and VOL ≤0.55 V at full load. |
| Matched rise/fall times | Ensures minimal duty-cycle distortion in clock distribution paths and reduces harmonic emissions. |
| 3-state bus isolation | Dual independent enables (OEA/OEB) allow dynamic partitioning of 8-bit data/address buses without contention. |
Applications
| Memory Address Driving | Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address bus in microcontroller-based industrial PLC with multiple peripheral chips. IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address outputs from high-capacitance bus traces and multiple decoder inputs. Use Value: 64-mA sink drive maintains signal integrity across 15 cm PCB traces loaded with 8× TTL inputs; 4.8-ns delay ensures setup/hold compliance at 25-MHz bus clocks. |
Use Scenario: Distributing a 10-MHz system clock to four synchronous peripherals in a test instrumentation rack. IC Role / Device Role / Timing Role: Low-skew fanout buffer providing matched rise/fall edges to minimize jitter accumulation across branches. Use Value: Edge-rate control cuts radiated emissions by >6 dBµV/m vs. standard FCT; matched tPLH/tPHL (≤8 ns) keeps inter-channel skew below 1 ns. |
| Bus-Oriented Transceivers | Industrial I/O Expansion |
|
Use Scenario: Bidirectional data bus interface between FPGA and legacy ISA-compatible peripheral card in embedded controller. IC Role / Device Role / Timing Role: Dual 4-bit 3-state buffer enabling direction-controlled data flow with hardware-selectable enable groups (OEA/OEB). Use Value: Independent OEA/OEB allows FPGA to assert one group while holding the other in high-Z, preventing bus contention during read/write transitions. |
Use Scenario: Expanding digital I/O count in a DIN-rail mounted HVAC controller using discrete sensors and relays. IC Role / Device Role / Timing Role: Level-shifter-free interface between 5-V MCU GPIO and 5-V industrial sensors/actuators with 200-pF cable capacitance. Use Value: Ioff protection permits safe hot-swap of field modules; 0.55-V max VOL ensures reliable low-level detection even with 100-mA relay coil inductance kickback. |
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 logic function, SOIC-20 package, but rated for –40°C to +85°C with 4.8-ns max tPLH/tPHL; identical Ioff and drive specs. | No functional difference; pinout and timing match CY74FCT240ATSOC exactly. | Select when requiring TI's newer packaging (tape-and-reel, MSL-1) or extended traceability documentation. |
| 74ACT240SC | Advanced CMOS variant with 5-V supply, 8-mA IOH/24-mA IOL, 7.5-ns max propagation delay, and no Ioff support. | Lacks partial-power-down capability; unsuitable for hot-swap or multi-rail sequencing applications. | Choose only for cost-sensitive designs where Ioff is unnecessary and lower drive (24-mA sink) suffices. |
Compared with SN74FCT240ATPWR, CY74FCT240ATSOC offers identical timing and drive but differs in reel packaging format (tube vs. tape-and-reel) and marking; versus 74ACT240SC, it delivers 2.7× higher sink current and critical Ioff protection for industrial power management.
Availability
CY74FCT240ATSOC is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT240ATSOC 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 experience.
The CY74FCT240ATSOC belongs to TI's FCT logic family, designed specifically for high-drive, low-noise, TTL-compatible interfacing in mission-critical industrial and communications equipment.
FAQ
What is the maximum operating temperature range for CY74FCT240ATSOC?
CY74FCT240ATSOC is rated for continuous operation from –40°C to +85°C ambient temperature, making it suitable for industrial environments such as factory floor controllers, outdoor telecom cabinets, and transportation electronics where thermal cycling is common. This range is validated per JEDEC JESD22-A104 and confirmed in the official TI datasheet SCCS017A revision October 2001.
Does CY74FCT240ATSOC support partial-power-down functionality?
Yes, CY74FCT240ATSOC includes Ioff circuitry that actively disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature protects the device during power sequencing or hot-swap events in multi-supply systems. The Ioff specification is explicitly verified in the "Electrical Characteristics" table of the CY74FCT240T datasheet (SCCS017A, page 5).
What is the propagation delay of CY74FCT240ATSOC under typical conditions?
CY74FCT240ATSOC has a maximum propagation delay (tPLH/tPHL) of 8 ns at VCC = 4.75 V to 5.25 V and TA = –40°C to +85°C, as specified in the "Switching Characteristics" table (page 7, CY74FCT240AT row). Typical delay is 4.8 ns, enabling reliable use in 25-MHz address/data buses with margin for trace delays and loading.
Is CY74FCT240ATSOC pin-compatible with older FCT-series buffers?
Yes, CY74FCT240ATSOC is functionally, electrically, and physically pin-compatible with CY74FCT240T and CY54FCT240T variants in SOIC-20 packages. The pinout matches the standard 20-pin SOIC layout shown in the "CY74FCT240T . . . Q OR SO PACKAGE (TOP VIEW)" diagram (page 1), and the datasheet confirms "Function, Pinout, and Drive Compatible With FCT and F Logic".
What package type and dimensions does CY74FCT240ATSOC use?
CY74FCT240ATSOC uses a SOIC-20 package (TI drawing DW), measuring 7.5 mm × 12.8 mm with 1.27 mm lead pitch and 2.65 mm maximum height. It features NiPdAu lead finish, RoHS compliance, and MSL Level-1 rating (unlimited reflow). Full mechanical details are in TI's DW0020A package outline document dated May 2016.
CY74FCT240ATSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
CY74FCT240ATSOC FAQ
1.How can I place an order for CY74FCT240ATSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT240ATSOC 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 CY74FCT240ATSOC reliable?
The price and inventory of CY74FCT240ATSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT240ATSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT240ATSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT240ATSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT240ATSOC?
CY74FCT240ATSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT240ATSOC 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 CY74FCT240ATSOC?
For technical support, including CY74FCT240ATSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT240ATSOC requirements.
6.How does Aetrix verify that CY74FCT240ATSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT240ATSOC 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 CY74FCT240ATSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT240ATSOC?
All CY74FCT240ATSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT240ATSOC, 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 CY74FCT240ATSOC part is unused and in its original packaging.
Return procedure for CY74FCT240ATSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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