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Renesas 74FCT240ATSOG
- Part No.:
- 74FCT240ATSOG
- Manufacturer:
- Renesas
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT240ATSOG.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,352
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Product details
Overview
74FCT240ATSOG from Renesas Electronics (formerly IDT) is a fast CMOS octal buffer/line driver with 3-state outputs, designed for memory and address bus driving, clock distribution, and bus-oriented transmitter/receiver applications. It features true TTL input/output compatibility (VOH = 3.3 V typ., VOL = 0.3 V typ.), high drive capability (–15 mA IOH, 64 mA IOL), and industrial temperature operation (–40°C to +85°C).
For engineers reviewing the 74FCT240ATSOG datasheet, 74FCT240ATSOG pinout, 74FCT240ATSOG application, or 74FCT240ATSOG equivalent, key selection criteria include its dual active-low 3-state enable inputs (OEA/OEB), SOIC-20 Green package, JEDEC 18 compliance, and live-insertion support via power-off disable outputs.
Technical Context
The 74FCT240ATSOG implements eight independent non-inverting buffers, each with separate input (Dx) and output (Ox) terminals, controlled by two shared active-low 3-state enables (OEA, OEB). Its dual-metal CMOS process ensures CMOS power efficiency while maintaining TTL-compatible voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and robust noise immunity (200 mV hysteresis).
Propagation delays are tightly specified: tPLH/tPHL ≤ 4.8 ns (CL = 50 pF, RL = 500 Ω), with enable/disable times (tPZH/tPZL/tPHZ/tPLZ) ≤ 6.5 ns. The device supports asynchronous control and meets MIL-STD-883 Class B for military-grade reliability when ordered in CERDIP/LCC packages - though 74FCT240ATSOG itself is the industrial SOG variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 5.0 V ±5% - fixed single-rail operation compatible with legacy 5 V TTL systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Output Drive | –15 mA IOH / +64 mA IOL - sufficient to drive multiple TTL loads or terminated transmission lines |
| Input Leakage | ≤ ±1 µA max - minimizes bus loading and signal integrity impact in high-density designs |
| Propagation Delay | ≤ 4.8 ns (tPLH/tPHL) - enables reliable operation in 100+ MHz address/data bus timing windows |
| Enable Propagation | tPZH ≤ 6.2 ns - supports fast bus arbitration and dynamic bus sharing |
| Input Capacitance | 6–10 pF - low capacitive loading preserves signal edge rates on shared buses |
Pinout & Package
74FCT240ATSOG is housed in a 20-pin Small Outline IC (SOIC) package with green (RoHS-compliant) finish, designated "SOG" in Renesas ordering nomenclature. Pin numbering follows standard SOIC top-view convention with index mark at Pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low 3-state output enable controls for two groups of four buffers each |
| 2–5, 11–14 | D0–D3, DB0–DB3 | Buffer inputs - electrically isolated per channel; no internal bus contention |
| 6–9, 15–18 | O0–O3, OB0–OB3 | Non-inverting 3-state outputs - high-impedance state prevents bus conflicts during disable |
| 10 | GND | Ground reference for all I/O and power domains |
| 20 | VCC | +5 V supply - powers logic core and output drivers; decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| True TTL input compatibility | VIH = 2.0 V min / VIL = 0.8 V max - interoperable with legacy 74LS/74ALS without level shifters |
| High sink/source drive | 64 mA IOL / –15 mA IOH - drives 10+ standard TTL loads or 50 Ω transmission lines directly |
| Live insertion support | Power-off disable outputs - prevents back-driving and bus contention during hot-swap operations |
| JEDEC 18 compliance | Fully conforms to industry-standard electrical and switching requirements for 5 V logic interfaces |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
Use Scenario: Driving multiplexed address lines between CPU and SRAM/DRAM controllers in embedded industrial controllers. IC Role / Device Role / Timing Role: Non-inverting octal buffer with 3-state control isolates address bus segments during DMA cycles. Use Value: 4.8 ns propagation delay and 64 mA drive ensure setup/hold timing margins are met across 10 cm PCB traces at 25 MHz bus rates. | Use Scenario: Distributing a master system clock to multiple peripheral ICs (UART, SPI, GPIO expanders) on a shared board. IC Role / Device Role / Timing Role: Low-skew, high-drive clock fanout buffer with independent enable control per group. Use Value: Matched tPLH/tPHL and <6.5 ns enable timing allow synchronous startup of peripherals without clock skew-induced metastability. |
| Bus-Oriented Transceiver Interface | Legacy TTL Bus Isolation |
Use Scenario: Bidirectional data bus interface between microcontroller and external FPGA-based co-processor using time-multiplexed read/write cycles. IC Role / Device Role / Timing Role: Dual-group 3-state buffer enabling direction-controlled data flow without external direction logic. Use Value: Independent OEA/OEB pins permit precise timing control of bus turn-around, minimizing dead-time overhead in burst transfers. | Use Scenario: Interfacing modern low-power MCU GPIOs to legacy 74LS-based peripheral cards in test equipment rack systems. IC Role / Device Role / Timing Role: Level-translation and drive-strengthening buffer preserving TTL logic thresholds and noise margins. Use Value: 0.3 V VOL and 3.3 V VOH (typ.) meet 74LS VIH/VIL specs while sourcing/sinking 10× more current than LS devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F240N | Lower drive (–15 mA IOH / +64 mA IOL same), but higher ICC (10 mA typical) and no live-insertion support | Not rated for industrial temp range; limited to 0°C to +70°C commercial use | Choose only for cost-sensitive, non-industrial legacy replacements where thermal margin exists |
| 74ACT240SCX | Higher speed (tPD ≤ 3.5 ns), 5 V tolerant inputs, but higher input capacitance (12 pF) and no MIL-STD-883 qualification path | Optimized for high-speed digital logic, not bus isolation or clock fanout with strict skew control | Select when sub-4 ns propagation and 5 V tolerance are mandatory, and industrial reliability is secondary |
Compared with SN74F240N and 74ACT240SCX, the 74FCT240ATSOG uniquely balances industrial temperature rating, live-insertion capability, JEDEC 18 compliance, and proven bus-driving performance - making it optimal for long-lifecycle industrial control and instrumentation designs requiring field-replaceable modules.
Availability
74FCT240ATSOG is available at Aetrix Electronics and suitable for memory subsystem buffering, clock distribution networks, and bus-oriented transceiver interfaces requiring stable component supply across extended industrial temperature ranges and multi-year production programs.
Supply support for 74FCT240ATSOG 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 74FCT240ATSOG belongs to Renesas' legacy IDT logic family, engineered specifically for high-reliability industrial and military bus interface applications requiring TTL compatibility, robust drive strength, and extended temperature operation.
FAQ
What is the operating voltage range for the 74FCT240ATSOG?
The 74FCT240ATSOG operates at a nominal VCC of 5.0 V with a tolerance of ±5%, meaning its valid supply range is 4.75 V to 5.25 V. This specification ensures compatibility with standard 5 V TTL and CMOS systems. Operation outside this range may cause functional failure or damage. The device does not support mixed-voltage or wide-VCC operation - it is strictly a 5 V logic device. All DC and switching parameters in the datasheet are characterized within this window.
Does the 74FCT240ATSOG support live insertion, and how is it implemented?
Yes, the 74FCT240ATSOG supports live insertion through its power-off disable feature: when VCC = 0 V, all outputs enter a high-impedance state regardless of input or enable conditions. This prevents back-driving of powered bus lines during hot-swap events. The behavior is inherent to the internal circuit design and requires no external circuitry. This function is explicitly verified in the datasheet's Absolute Maximum Ratings and Functional Description sections for the 74FCT240ATSOG.
What are the exact pin functions of OEA and OEB on the 74FCT240ATSOG?
OEA (Pin 1) and OEB (Pin 19) are active-low 3-state output enable inputs that independently control two groups of four buffers each. When OEA is LOW, outputs OA0–OA3 are enabled; when HIGH, they go high-impedance. Similarly, OEB enables OB0–OB3. Both must be LOW to activate all eight outputs. This grouping allows partial bus control - for example, isolating upper/lower nibbles of an address bus. The 74FCT240ATSOG datasheet confirms this split-enable architecture in the Function Table and Pin Description sections.
Is the 74FCT240ATSOG RoHS compliant, and what does 'SOG' signify in its part number?
Yes, the 74FCT240ATSOG is RoHS compliant, as confirmed by the "Green" designation in Renesas' ordering information and the "SOG" suffix, which stands for Small Outline IC with green (lead-free) finish. The "SOG" package is a 20-pin SOIC variant meeting JEDEC MS-012 standards, with 0.3 inch body width and 1.27 mm lead pitch. This marking is unambiguous in the official Renesas datasheet's Ordering Information table for the 74FCT240ATSOG.
How does the 74FCT240ATSOG differ from the military-grade 54FCT240ATLQ?
The 74FCT240ATSOG is the industrial-grade version (–40°C to +85°C), packaged in SOIC-20 (SOG), while the 54FCT240ATLQ is military-grade (–55°C to +125°C), packaged in LCC-20 (LQ). Electrically, both share identical logic function, pinout, and DC/AC specifications - but the military variant undergoes additional screening per MIL-STD-883 Class B and is DESC-listed. The 74FCT240ATSOG is not qualified to those standards. Their shared FCT240AT core ensures functional interchangeability where temperature and qualification requirements align.
74FCT240ATSOG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- 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:
- 15mA, 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
74FCT240ATSOG FAQ
1.How can I place an order for 74FCT240ATSOG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT240ATSOG 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 74FCT240ATSOG reliable?
The price and inventory of 74FCT240ATSOG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT240ATSOG is usually 5 days.
3.What payment methods are accepted for 74FCT240ATSOG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT240ATSOG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT240ATSOG?
74FCT240ATSOG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT240ATSOG 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 74FCT240ATSOG?
For technical support, including 74FCT240ATSOG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT240ATSOG requirements.
6.How does Aetrix verify that 74FCT240ATSOG is sourced from the original manufacturer or authorized distributors?
All 74FCT240ATSOG 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 74FCT240ATSOG meets industry standards.
7.What is the process for return or replacement of 74FCT240ATSOG?
All 74FCT240ATSOG units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT240ATSOG, 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 74FCT240ATSOG part is unused and in its original packaging.
Return procedure for 74FCT240ATSOG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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