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Texas Instruments CD74FCT240M
- Part No.:
- CD74FCT240M
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74FCT240M.pdf
- Description:
- IC BUFF/LINE DRVR OCT 3-ST 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,918
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Product details
Overview
CD74FCT240M from Texas Instruments is a BiCMOS octal buffer/line driver with 3-state inverted outputs, designed for TTL-compatible bus interface applications. It features 64-mA sink current per output, 3.7-V output voltage swing limitation, and controlled edge rates to suppress EMI. The device operates across 4.75 V to 5.25 V at 0°C to 70°C and uses dual active-low OE controls for two independent 4-bit channels.
For engineers reviewing the CD74FCT240M datasheet, CD74FCT240M pinout, CD74FCT240M application, or CD74FCT240M equivalent, key selection criteria include its BiCMOS low-power/high-drive architecture, 3-state isolation during power sequencing, and compatibility with 5-V TTL logic families in high-noise industrial backplanes and memory address buffers.
Technical Context
The CD74FCT240M implements a hybrid bipolar-CMOS output stage that clamps high-level output to ~3.7 V (two diode drops below VCC), reducing VCC bounce, ground bounce, and EMI during simultaneous switching. Its input-to-output propagation delay is 1.5–8 ns, with enable/disable times of 1.5–10 ns, enabling use in fast synchronous bus systems.
Each of the two 4-bit sections has an independent active-low output-enable (OE) input; when OE is high, outputs enter high-impedance state regardless of input state. Input/Output isolation from VCC and buffered inputs ensure robust noise immunity and stable operation during power-up/down transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures compatibility with standard 5-V TTL supply rails and tolerance against rail droop. |
| IOL per Output | 64 mA - Supports driving heavy capacitive loads or multiple TTL inputs without signal degradation. |
| VOH / VOL | 2.4 V min / 0.55 V max at IOL = 64 mA - Guarantees valid TTL logic levels under full load conditions. |
| tpd (A→Y) | 1.5 ns min / 8 ns max - Enables reliable timing in 100+ MHz bus environments with margin. |
| Output Swing Limit | 0 V to 3.7 V - Reduces power-bus ringing and electromagnetic interference in dense PCB layouts. |
| Operating Temp | 0°C to 70°C - Qualified for commercial-grade embedded control and instrumentation applications. |
| Input Clamp Voltage | –1.2 V - Protects inputs from negative transients up to –1.2 V without damage. |
Pinout & Package
CD74FCT240M is housed in a 20-pin plastic small-outline (SOIC) package (M suffix), with 1.27-mm pitch and JEDEC MS-013 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 and Channel 2; must be pulled high via resistor for safe power-up high-Z state. |
| 2, 4, 6, 8 | 1A1–1A4 | Inverted data inputs for first 4-bit channel; buffered for noise immunity and drive strength. |
| 3, 5, 7, 9 | 2Y1–2Y4 | Inverted outputs for second 4-bit channel; 3-state capable with 64-mA sink capability. |
| 11–14, 16–18 | 1Y1–1Y4, 2A1–2A4 | Inverted outputs (Ch1) and inputs (Ch2); pin-symmetric layout supports bidirectional bus routing. |
| 10 | GND | Ground reference for all I/O and internal circuitry; requires low-inductance connection to minimize bounce. |
| 20 | VCC | 5-V supply input; decoupling capacitor required within 1 cm to suppress transient current spikes. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Stage | Combines bipolar speed and CMOS efficiency to deliver 64-mA sink current while limiting VOH to 3.7 V for EMI reduction. |
| Controlled Edge Rates | Slower than pure CMOS but faster than standard TTL - balances switching speed and radiated emissions in shared bus environments. |
| SCR Latch-Up Resistance | Qualified per JEDEC JESD78 - ensures immunity to latch-up events under overvoltage or ESD stress in industrial settings. |
| Input/Output Isolation from VCC | Prevents feedthrough during VCC ramp-up/down - eliminates spurious outputs during power sequencing without external hold circuits. |
Applications
| Memory Address Buffering | Microprocessor Bus Interface |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Octal inverting buffer with 3-state control isolates address bus segments during DMA cycles or peripheral access. Use Value: 64-mA sink current ensures clean signal integrity across long traces; 3.7-V swing minimizes crosstalk-induced glitches in parallel address buses. | Use Scenario: Interfacing a 5-V microprocessor's data/address bus to peripheral ICs with varying input thresholds. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer providing TTL-compatible drive strength and controlled slew for timing-critical bus cycles. Use Value: Propagation delay ≤8 ns meets setup/hold timing budgets for 12-MHz bus clocks; dual OE enables selective channel gating. |
| Industrial Backplane Driver | Legacy System Bus Extender |
Use Scenario: Driving signals across noisy 100-mm backplane traces in programmable logic controllers or test equipment. IC Role / Device Role / Timing Role: Noise-immune line driver with buffered inputs and output voltage swing limiting to suppress ground bounce. Use Value: 3.7-V VOH reduces dV/dt-induced EMI; SCR latch-up resistance prevents failure in electrically harsh factory environments. | Use Scenario: Replacing obsolete 74LS240 in legacy computer systems requiring drop-in 5-V TTL compatibility. IC Role / Device Role / Timing Role: Pin-compatible octal inverting buffer with enhanced drive strength and lower quiescent power than LS family. Use Value: 8 mA ICC max vs. 20+ mA for LS240 - extends system-level power budget while maintaining identical pinout and logic function. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F240N | FET-TTL process; 35-mA sink, higher ICC (25 mA), no output swing limiting | Lacks EMI suppression features; suitable only where lower drive and higher power are acceptable | Use when cost is primary constraint and EMI is not critical; verify layout for increased ground bounce. |
| 74ACT240SC | Advanced CMOS; 24-mA sink, full-rail VOH (VCC), faster tpd (3.5 ns typ) | Higher VOH increases EMI risk; lacks BiCMOS EMI mitigation and latch-up immunity | Select for speed-critical designs with tight timing margins; add external filtering if used in noisy environments. |
Compared with SN74F240N and 74ACT240SC, the CD74FCT240M uniquely combines 64-mA drive, 3.7-V swing limiting, and SCR latch-up resistance - making it optimal for industrial bus drivers where reliability, noise immunity, and load capacity are jointly prioritized.
Availability
CD74FCT240M is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus interfacing, and industrial backplane driver applications requiring stable component supply and long-term obsolescence management.
Supply support for CD74FCT240M 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 decades of experience in high-reliability industrial and automotive IC design.
The CD74FCT240M belongs to TI's FCT logic family - engineered for 5-V TTL-compatible systems needing low-power BiCMOS performance, EMI control, and robust operation in electrically noisy environments.
FAQ
What is the maximum output sink current specification for CD74FCT240M?
The CD74FCT240M is rated for 64 mA per output pin under recommended operating conditions (VCC = 4.75 V to 5.25 V, TA = 0°C to 70°C). This value is confirmed in the "Recommended Operating Conditions" table of the SCBS729 datasheet and verified by electrical characteristics testing at IOL = 64 mA with VOL ≤ 0.55 V. The absolute maximum rating allows up to 70 mA, but sustained operation above 64 mA may exceed thermal limits in the M-package.
Does CD74FCT240M support true 5-V rail-to-rail output swing?
No, the CD74FCT240M does not provide rail-to-rail output swing. Its BiCMOS output stage limits VOH to approximately 3.7 V (two diode drops below VCC) to reduce power-bus ringing and EMI. At VCC = 5 V, VOH is guaranteed ≥2.4 V under load (IOH = –15 mA), and the 3.7-V ceiling is a deliberate design feature-not a limitation-for noise-sensitive applications.
How should the OE pins of CD74FCT240M be handled during power-up?
To ensure high-impedance outputs during power-up, both OE pins (pins 1 and 19) must be tied to VCC through pullup resistors. The minimum resistor value is determined by the driver's current-sinking capability; TI recommends ≥4.7 kΩ for typical use. This prevents unintended output activation before system initialization completes, avoiding bus contention in multi-driver configurations.
Is CD74FCT240M compatible with 3.3-V logic inputs?
No, CD74FCT240M is not designed for direct 3.3-V logic input interfacing. Its VIH threshold is specified at 2.0 V minimum (with VCC = 4.75 V), but the input structure is optimized for 5-V TTL levels. Applying 3.3-V signals risks marginal recognition of logic-high states and violates recommended operating conditions. A level-shifter or 5-V tolerant interface buffer is required for mixed-voltage systems.
What thermal performance can be expected from the CD74FCT240M in SOIC (M) package?
The CD74FCT240M in the plastic small-outline (M) package has a junction-to-ambient thermal impedance (θJA) of 58°C/W, as specified in the Absolute Maximum Ratings table. Under worst-case conditions (ICC = 80 µA, IOL = 64 mA on all eight outputs), power dissipation remains below 150 mW - resulting in <10°C junction rise above ambient. This enables reliable operation without heatsinking in standard commercial PCB layouts.
CD74FCT240M 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:
- Inverter
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74FCT240M FAQ
1.How can I place an order for CD74FCT240M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT240M 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 CD74FCT240M reliable?
The price and inventory of CD74FCT240M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT240M is usually 5 days.
3.What payment methods are accepted for CD74FCT240M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT240M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT240M?
CD74FCT240M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT240M 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 CD74FCT240M?
For technical support, including CD74FCT240M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT240M requirements.
6.How does Aetrix verify that CD74FCT240M is sourced from the original manufacturer or authorized distributors?
All CD74FCT240M 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 CD74FCT240M meets industry standards.
7.What is the process for return or replacement of CD74FCT240M?
All CD74FCT240M units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT240M, 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 CD74FCT240M part is unused and in its original packaging.
Return procedure for CD74FCT240M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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