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Texas Instruments 74FCT2240CTSOCTE4
- Part No.:
- 74FCT2240CTSOCTE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT2240CTSOCTE4.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
74FCT2240CTSOCTE4 from Texas Instruments is an octal 3-state buffer/line driver with integrated 25-Ω output series resistors, designed for memory address driving, clock distribution, and bus transceiver applications in TTL- and CMOS-compatible systems. It operates at 4.75–5.25 V, delivers ±15 mA drive strength, supports partial-power-down via Ioff, and achieves 4.1 ns typical propagation delay.
For engineers reviewing the 74FCT2240CTSOCTE4 datasheet, 74FCT2240CTSOCTE4 pinout, 74FCT2240CTSOCTE4 application, or 74FCT2240CTSOCTE4 equivalent, key selection criteria include its 25-Ω on-die termination for reflection suppression, Ioff-enabled partial power-down capability, TTL-compatible input thresholds, and SOIC-20 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
This device implements dual independent 4-bit noninverting buffers, each controlled by separate 3-state enable inputs (OEA and OEB). Its edge-rate control circuitry limits slew rate to reduce simultaneous switching noise, while internal 25-Ω series resistors per output eliminate need for external termination on PCB traces.
The Ioff feature actively disables outputs when VCC = 0 V, blocking reverse current flow during hot-insertion or partial system power-down. Input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output levels (VOH = 2.4 V min at –15 mA, VOL = 0.55 V max at 12 mA) ensure robust interoperability with TTL, NMOS, and CMOS logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation across industrial rail tolerances without external regulation. |
| Propagation Delay | 4.1 ns max (tPLH/tPHL) - Enables high-speed bus timing in 25-MHz+ synchronous systems. |
| Output Drive | –15 mA source / +12 mA sink - Sufficient to drive 50-pF loads with <1 ns rise/fall time under controlled edge rates. |
| On-Die Termination | 25 Ω series resistance per output - Reduces signal reflections on transmission lines without discrete resistors or layout overhead. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backfeed current during partial power-down, protecting powered subsystems. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial handling and board-level ESD immunity requirements. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial environments without derating. |
Pinout & Package
74FCT2240CTSOCTE4 is housed in a 20-pin SOIC (DW) package with 0.300-inch body width, JEDEC MS-013 compliant footprint, and RoHS-compliant CU NIPDAU lead finish. Thermal resistance θJA = 58°C/W enables operation up to 85°C ambient at full load without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs A (DA0–DA3) & B (DB0–DB3) | Two independent 4-bit input banks accepting TTL/CMOS logic levels; no internal pull-ups or pull-downs. |
| 9 | GND | Ground reference for all I/O and internal circuitry; must be low-impedance connection. |
| 10, 19 | Output Enables (OEA, OEB) | Active-low enables controlling respective 4-bit output groups; high-impedance state when asserted high. |
| 11, 12, 13, 14, 15, 16, 17, 18 | Outputs A (OA0–OA3) & B (OB0–OB3) | Noninverting buffered outputs with integrated 25-Ω series termination; drive capability ±15 mA. |
| 20 | VCC | Primary power supply; decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω Output Resistors | Eliminates need for eight external series termination resistors, reducing BOM count and PCB area in high-speed routing. |
| Ioff Partial-Power-Down Support | Enables safe insertion/removal in live backplanes or multi-rail systems by disabling outputs when VCC is unpowered. |
| TTL-Compatible Input Thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V allow direct interface with legacy TTL without level-shifting components. |
| Edge-Rate Controlled Outputs | Controlled slew rate minimizes crosstalk and ground bounce in dense PCB layouts with multiple switching outputs. |
| High-Noise Immunity | Input hysteresis (Vhys = 0.2 V) rejects transient noise on control and data lines in electrically noisy environments. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/Flash in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address outputs from capacitive bus load; provides 25-Ω matched termination to suppress reflections on 4-inch traces. Use Value: Eliminates external termination resistors and reduces signal integrity validation effort while maintaining <1 ns timing margin at 20 MHz. | Use Scenario: Bidirectional data buffering between two isolated 8-bit peripheral buses in factory automation I/O modules. IC Role / Device Role / Timing Role: Dual 4-bit 3-state line driver enabling direction-controlled data transfer; OEA/OEB pins synchronized to bus arbitration logic. Use Value: Supports hot-swap capability via Ioff, preventing bus contention during module replacement without system reset. |
| Clock Distribution Network | Legacy System Interface Adapter |
Use Scenario: Fan-out of 5-MHz system clock to multiple FPGA configuration ICs and CPLD JTAG controllers. IC Role / Device Role / Timing Role: Low-skew clock buffer with matched output impedance; each OA/OB pair driven by dedicated enable for selective gating. Use Value: 4.1 ns max tPLH ensures sub-cycle skew across eight loads, meeting setup/hold timing for 25-MHz-configured devices. | Use Scenario: Interfacing modern 3.3-V microcontrollers to legacy 5-V TTL peripherals (e.g., UARTs, display drivers) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Level-tolerant buffer translating logic states without external biasing; accepts 3.3-V inputs while sourcing 5-V-compatible outputs. Use Value: VOH ≥ 2.4 V at –15 mA meets TTL VIH minimum, enabling drop-in replacement of obsolete 74LS240 without redesign. |
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 |
|---|---|---|---|
| SN74FCT2240CTSOCT | Same die, identical electrical specs, TI-marked top-side marking "FCT2240C"; differs only in tape-and-reel packaging (2000 pcs vs. E4's 2000 pcs). | No functional difference; both rated for –40°C to +85°C, same SOIC-20 DW package and RoHS compliance. | Select SN74FCT2240CTSOCT if standard TI branding and documentation traceability are required over distributor-specific E4 suffix. |
| 74AC240N | Higher drive (±24 mA), faster speed (3.5 ns), but no on-die 25-Ω resistors or Ioff; CMOS input thresholds (VIH = 3.15 V) incompatible with TTL. | Suitable for new 3.3-V designs with tight timing budgets, but requires external termination and cannot support partial-power-down. | Choose 74AC240N only when higher speed and drive outweigh loss of integrated termination and Ioff functionality. |
Compared with SN74FCT2240CTSOCT, 74FCT2240CTSOCTE4 offers identical performance and reliability but with distributor-specific reel packaging and traceability; versus 74AC240N, it trades raw speed for critical industrial features-on-die termination, Ioff, and TTL compatibility-enabling robust legacy interface design without layout or firmware changes.
Availability
74FCT2240CTSOCTE4 is available at Aetrix Electronics and suitable for memory address buffering, industrial bus transceivers, clock distribution networks, and legacy system interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74FCT2240CTSOCTE4 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74FCT family was engineered for high-speed, low-noise, TTL-compatible logic interfacing in industrial control and computing infrastructure, emphasizing signal integrity, power efficiency, and system-level robustness.
FAQ
What is the maximum operating frequency supported by the 74FCT2240CTSOCTE4?
The 74FCT2240CTSOCTE4 does not specify a maximum clock frequency in its datasheet because it is a combinational buffer-not a clocked device. However, its 4.1 ns maximum propagation delay enables reliable operation in systems with signal edges repeating up to approximately 25 MHz (based on 1/(2 × tPD)), assuming proper PCB layout and load capacitance ≤50 pF per output.
Does the 74FCT2240CTSOCTE4 support hot-swap or partial-power-down operation?
Yes, the 74FCT2240CTSOCTE4 supports partial-power-down via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs, limiting reverse current to ±1 µA even if input or output pins are driven to 4.5 V. This allows safe insertion into live backplanes or operation in multi-rail systems where this device may be unpowered while adjacent circuits remain active.
Can the 74FCT2240CTSOCTE4 drive standard 50-Ω transmission lines directly?
No-the 74FCT2240CTSOCTE4 integrates 25-Ω series resistors per output, optimized for driving unterminated PCB traces with characteristic impedance near 50 Ω in series-terminated configurations. For true 50-Ω source termination, an additional 25-Ω external resistor is required; the internal 25-Ω resistor alone yields 25-Ω source impedance, not 50 Ω.
What is the purpose of the dual output-enable inputs (OEA and OEB) on the 74FCT2240CTSOCTE4?
The 74FCT2240CTSOCTE4 features two independent active-low output-enable inputs-OEA controls OA0–OA3, and OEB controls OB0–OB3-allowing selective 4-bit group enable/disable. This enables flexible bus partitioning, such as gating address high-byte vs. low-byte, or separating control and data paths in multi-function interfaces without requiring additional logic gates.
Is the 74FCT2240CTSOCTE4 pin-compatible with older 74LS240 devices?
The 74FCT2240CTSOCTE4 is functionally compatible with 74LS240 but not pin-compatible: 74LS240 uses a different pinout (e.g., OE* on pin 1, GND on pin 10), whereas 74FCT2240CTSOCTE4 places GND on pin 9 and has dual enables (OEA/OEB) on pins 10 and 19. Board redesign is required for replacement, though logic behavior and voltage compatibility simplify migration.
74FCT2240CTSOCTE4 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:
- 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:
- 15mA, 12mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74FCT2240CTSOCTE4 FAQ
1.How can I place an order for 74FCT2240CTSOCTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT2240CTSOCTE4 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 74FCT2240CTSOCTE4 reliable?
The price and inventory of 74FCT2240CTSOCTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT2240CTSOCTE4 is usually 5 days.
3.What payment methods are accepted for 74FCT2240CTSOCTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT2240CTSOCTE4 transactions.
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4.How is shipping managed for 74FCT2240CTSOCTE4?
74FCT2240CTSOCTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT2240CTSOCTE4 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 74FCT2240CTSOCTE4?
For technical support, including 74FCT2240CTSOCTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT2240CTSOCTE4 requirements.
6.How does Aetrix verify that 74FCT2240CTSOCTE4 is sourced from the original manufacturer or authorized distributors?
All 74FCT2240CTSOCTE4 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 74FCT2240CTSOCTE4 meets industry standards.
7.What is the process for return or replacement of 74FCT2240CTSOCTE4?
All 74FCT2240CTSOCTE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT2240CTSOCTE4, 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 74FCT2240CTSOCTE4 part is unused and in its original packaging.
Return procedure for 74FCT2240CTSOCTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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