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Texas Instruments CY74FCT240CTSOC
- Part No.:
- CY74FCT240CTSOC
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT240CTSOC.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
CY74FCT240CTSOC 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 features 64-mA sink / 32-mA source output drive, 4.3-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output logic levels.
For engineers reviewing the CY74FCT240CTSOC datasheet, CY74FCT240CTSOC pinout, CY74FCT240CTSOC application, or CY74FCT240CTSOC equivalent, key selection considerations include its SOIC-20 package, 4.75–5.25 V supply range, 3-state enable control (OEA/OEB), edge-rate controlled outputs for noise reduction, and compatibility with legacy FCT logic families.
Technical Context
The CY74FCT240CTSOC implements dual 4-bit noninverting buffer sections, each with independent 3-state enable inputs (OEA and OEB). Its output structure uses edge-rate control circuitry to limit slew rate, reducing simultaneous switching noise in high-density digital systems.
It supports partial-power-down operation via Ioff, which disables outputs and limits reverse current flow when VCC = 0 V. Input thresholds are TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and outputs drive standard TTL loads while maintaining CMOS-level quiescent current (ICC ≤ 0.2 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation across industrial-grade voltage tolerance without external regulation. |
| Propagation Delay | 4.3 ns max (tPLH/tPHL) - Enables reliable timing in 100+ MHz bus systems with margin. |
| Output Drive | 64 mA sink / 32 mA source - Directly drives 10+ TTL loads or stub-loaded transmission lines. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backfeed damage during hot-swap or power sequencing. |
| ESD Protection | 2000-V HBM - Meets JEDEC JESD22-A114A for robust handling in manufacturing environments. |
| Operating Temp | –40°C to +85°C - Qualified for commercial/industrial ambient conditions without derating. |
| Input Compatibility | TTL-level thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - Interoperates with legacy 5-V logic without level shifters. |
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 enable inputs - Independently control output groups A (pins 2–9) and B (pins 12–19). |
| 2, 4, 6, 8 | DA0–DA3 | Noninverting data inputs for Group A - Connect to upstream address/control lines. |
| 3, 5, 7, 9 | OA0–OA3 | Group A buffered outputs - Drive downstream buses or memory address lines. |
| 12, 14, 16, 18 | DB0–DB3 | Noninverting data inputs for Group B - Support dual-bus or mirrored signal paths. |
| 13, 15, 17, 20 | OB0–OB3 | Group B buffered outputs - Provide isolated, noise-controlled output drive. |
| 10 | GND | Ground reference - Must be low-inductance connection to minimize ground bounce. |
| 20 | VCC | Power supply - Requires local 0.1 µF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt - critical for EMI-sensitive board layouts. |
| Ioff partial-power-down | Enables safe insertion/removal in live backplanes or multi-rail systems without latch-up risk. |
| Matched rise/fall times | Ensures symmetrical waveform edges - minimizes duty cycle distortion in clock distribution paths. |
| TTL/CMOS/NMOS interoperability | Eliminates need for external level-shifting components in mixed-logic designs. |
| Function & pinout compatibility | Drop-in replacement for CY74FCT240T and CY54FCT240T - preserves existing PCB layout and firmware. |
Applications
| Memory Address Driving | Clock Distribution |
|---|---|
Use Scenario: Driving 20-bit address bus to SRAM or EPROM in embedded microcontroller systems. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control enables bidirectional bus sharing and reduces capacitive loading on MCU pins. Use Value: 64-mA sink capability ensures fast, clean transitions across 100+ pF trace capacitance; 4.3-ns delay maintains setup/hold margins at 25-MHz bus rates. | Use Scenario: Distributing a master system clock to multiple peripheral ICs with matched skew. IC Role / Device Role / Timing Role: Low-skew, edge-controlled buffer isolates clock source from load variations and prevents reflection-induced jitter. Use Value: Matched rise/fall times (<1 ns mismatch) and 4.3-ns tPLH/tPHL guarantee <0.5-ns inter-output skew across all eight outputs. |
| Bus Transceiver Interface | Legacy Logic System Upgrade |
Use Scenario: Isolating and driving a shared data bus between microprocessor and peripheral ASIC in industrial PLC modules. IC Role / Device Role / Timing Role: Dual 4-bit sections (OEA/OEB) allow independent control of high/low byte lanes during read/write cycles. Use Value: Independent 3-state enables time-multiplexed bus arbitration; Ioff protects peripherals during CPU reset sequences. | Use Scenario: Replacing obsolete 74LS240 in avionics maintenance spares with pin-compatible, lower-power alternative. IC Role / Device Role / Timing Role: Drop-in functional and pinout replacement for LS/TTL systems requiring higher drive and noise immunity. Use Value: 32-mA source / 64-mA sink exceeds LS240 (8-mA/16-mA), enabling longer trace runs; edge-rate control meets DO-160E radiated emissions requirements. |
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 |
|---|---|---|---|
| CY74FCT240ATSOC | Slower 4.8-ns max propagation delay; same drive, Ioff, and pinout. | Suitable for cost-optimized designs where 100-MHz timing margin is relaxed. | Select when system clock frequency ≤ 80 MHz and thermal budget allows slightly higher ICCD. |
| SN74FCT240CTSO | Same speed (4.3 ns), identical SOIC-20 package, but TI-branded marking and different top-side code (FCT240C vs FCT240C). | Direct second-source for CY74FCT240CTSOC in TI-centric BOMs. | Choose for supply chain diversification while retaining full electrical and mechanical equivalence. |
Compared with CY74FCT240ATSOC, the CY74FCT240CTSOC delivers tighter timing for high-speed bus interfaces; versus SN74FCT240CTSO, it offers identical performance with Cypress-specific traceability and qualification history for legacy aerospace programs.
Availability
CY74FCT240CTSOC is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, and industrial bus interface applications requiring stable component supply across extended product lifecycles.
Supply support for CY74FCT240CTSOC 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 high-reliability component development.
The CY74FCT240CTSOC belongs to the FCT logic family, designed specifically for high-speed, low-noise, TTL-compatible digital interfacing in industrial, communications, and computing infrastructure.
FAQ
What is the maximum operating temperature range for CY74FCT240CTSOC?
The CY74FCT240CTSOC is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per the recommended operating conditions table in the TI datasheet SCCS017A, and applies to both SOIC (DW) and QSOP (DBQ) package variants of the CY74FCT240CT series.
Does CY74FCT240CTSOC support partial-power-down mode?
Yes, CY74FCT240CTSOC supports partial-power-down mode via its Ioff feature. When VCC = 0 V, the outputs are disabled and Ioff leakage is limited to ±1 µA, preventing damaging current backflow from powered downstream circuits into the unpowered IC - essential for hot-swap and multi-rail system designs.
What is the output drive strength of CY74FCT240CTSOC?
CY74FCT240CTSOC provides 64-mA maximum sink current and 32-mA maximum source current per output, measured at VCC = 4.75 V and specified over the full operating temperature range. This drive strength allows direct interfacing with up to 10 standard TTL loads or termination-matched transmission lines.
Is CY74FCT240CTSOC pin-compatible with older FCT family devices?
Yes, CY74FCT240CTSOC is functionally and pinout-compatible with CY74FCT240T and CY54FCT240T, including identical SOIC-20 pin assignments, logic diagram, and enable control (OEA/OEB). The "C" suffix denotes the 4.3-ns speed grade, but mechanical and electrical interface remains unchanged.
What package type and dimensions does CY74FCT240CTSOC use?
CY74FCT240CTSOC uses the SOIC-20 (DW) package: 7.5 mm × 12.8 mm body size, 2.65 mm maximum height, 1.27 mm lead pitch, and RoHS-compliant NiPdAu lead finish. Its MSL rating is Level-1 (unlimited floor life), and it ships in tubes of 25 units or tape-and-reel (CY74FCT240CTSOCT) with 2000 units per reel.
CY74FCT240CTSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-SOIC
CY74FCT240CTSOC FAQ
1.How can I place an order for CY74FCT240CTSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT240CTSOC 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 CY74FCT240CTSOC reliable?
The price and inventory of CY74FCT240CTSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT240CTSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT240CTSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT240CTSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT240CTSOC?
CY74FCT240CTSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT240CTSOC 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 CY74FCT240CTSOC?
For technical support, including CY74FCT240CTSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT240CTSOC requirements.
6.How does Aetrix verify that CY74FCT240CTSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT240CTSOC 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 CY74FCT240CTSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT240CTSOC?
All CY74FCT240CTSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT240CTSOC, 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 CY74FCT240CTSOC part is unused and in its original packaging.
Return procedure for CY74FCT240CTSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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