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onsemi 74LVQ240SJX
- Part No.:
- 74LVQ240SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVQ240SJX.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
74LVQ240SJX from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for memory address and clock distribution in 3.3V systems. It operates from 2.0V to 3.6V, delivers ±12mA output drive, guarantees 75Ω incident-wave switching, and features 4kV ESD immunity.
For engineers reviewing the 74LVQ240SJX datasheet, pinout, applications, or equivalent options, key selection criteria include simultaneous switching noise control, dynamic threshold performance at 3.3V, guaranteed tPLH/tPHL ≤10.5ns, and EIAJ TYPE II SOP (M20D) package compatibility.
Technical Context
The 74LVQ240SJX implements dual independent 3-STATE enable logic (OE1/OE2), each controlling four inverting outputs (O0–O3 and O4–O7). Its patented EMI reduction circuitry suppresses simultaneous switching noise, and it guarantees incident-wave switching into 75Ω transmission lines across −40°C to +85°C.
It meets strict dynamic input voltage thresholds (VIHD ≤2.0V, VILD ≤0.8V at VCC = 3.3V) and exhibits low dynamic VOLP (≤0.8V) and VOLV (≥−0.8V) under load, ensuring signal integrity in high-density bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0V to 3.6V - supports single-supply 3.3V operation with 10% tolerance margin |
| Output Drive | ±12mA - sufficient to drive standard TTL loads and 75Ω transmission lines |
| tPLH / tPHL | ≤10.5ns @ VCC = 3.3V, CL = 50pF - enables high-speed address/data buffering in memory interfaces |
| ESD Immunity | ≥4kV HBM - meets industrial handling robustness requirements without external protection |
| Simultaneous Switching Noise | Guaranteed level per datasheet - allows dense PCB layout without added decoupling overhead |
| Dynamic Thresholds | VIHD ≤2.0V, VILD ≥0.8V @ VCC = 3.3V - ensures reliable logic-level recognition under fast edge rates |
| 3-STATE Leakage | ±2.5µA max - minimizes bus leakage current when outputs are disabled |
Pinout & Package
74LVQ240SJX is packaged in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Number M20D).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 10, 11, 13, 15 | I0–I7 Inputs | Inverting data inputs; each drives corresponding output with polarity inversion |
| 3, 5, 7, 9 | OE2 Enable Inputs | Active-Low group enable for outputs O0–O3; shared control for four channels |
| 12, 14, 16, 18 | OE1 Enable Inputs | Active-Low group enable for outputs O4–O7; independent control from OE2 |
| 8 | GND | Ground reference for all I/O and internal circuitry |
| 20 | VCC | Positive supply rail (2.0V–3.6V); powers all logic and output stages |
| 17, 19, 16, 15, 13, 11, 9, 7 | O0–O7 Outputs | 3-STATE inverting outputs; high-impedance when respective OE is HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Patented EMI Reduction Circuitry | Reduces radiated emissions during simultaneous output transitions, easing EMC compliance in compact layouts |
| Guaranteed 75Ω Incident-Wave Switching | Ensures clean signal launch onto controlled-impedance traces without termination resistors in point-to-point links |
| Improved Latch-Up Immunity | Withstands transient overvoltage events up to ±300mA without destructive latch-up |
| Low Dynamic Threshold Performance | Maintains consistent VIH/VIL margins across temperature and voltage, preventing metastability in clock domains |
| 4kV HBM ESD Protection | Eliminates need for external ESD diodes in board-level handling and assembly environments |
Applications
| Memory Address Buffering | High-Speed Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Inverting octal buffer with grouped 3-STATE enables, isolating memory banks during access cycles. Use Value: Simultaneous switching noise control prevents address corruption; 10.5ns propagation delay supports >50MHz bus timing. | Use Scenario: Distributing a system clock to multiple peripherals while maintaining edge integrity. IC Role / Device Role / Timing Role: Low-skew (≤1.5ns) inverting line driver with 75Ω transmission-line compatibility. Use Value: Guaranteed incident-wave switching eliminates need for series termination; EMI reduction preserves signal fidelity. |
| Bus Transceiver Interface | Industrial Control Backplane Driver |
Use Scenario: Bidirectional data bus isolation between processor and FPGA using external direction control. IC Role / Device Role / Timing Role: Octal 3-STATE inverting driver acting as unidirectional leg of a half-duplex transceiver pair. Use Value: Dual OE groups (OE1/OE2) allow staggered enable timing to prevent bus contention during direction switching. | Use Scenario: Driving long parallel control lines (e.g., I/O expansion) across a 10cm+ backplane trace. IC Role / Device Role / Timing Role: Robust 3.3V line driver with high noise immunity and latch-up resistance for harsh environments. Use Value: 4kV ESD rating and −40°C to +85°C operation ensure reliability in factory automation equipment. |
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 |
|---|---|---|---|
| 74LVC240PW,118 | Non-inverting outputs; identical VCC range and 3-STATE timing; slightly lower tPLH (8.5ns typ) | Requires logic inversion upstream or downstream to match 74LVQ240SJX's inverting behavior | Select when non-inverting polarity aligns with system-level signal flow and lower typical delay is prioritized |
| SN74LV240APWR | Same inverting function and pinout; higher ICC (20µA max vs. 4µA typ); no guaranteed 75Ω incident-wave switching | Lacks documented transmission-line drive assurance; may require external termination in high-speed routing | Select when pin compatibility and TI's long-term supply assurance outweigh guaranteed 75Ω drive capability |
Compared with 74LVC240PW,118 and SN74LV240APWR, the 74LVQ240SJX uniquely provides guaranteed 75Ω incident-wave switching and patented EMI reduction-critical for noise-sensitive, high-density 3.3V bus designs where layout space limits termination options.
Availability
74LVQ240SJX is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus interface, and industrial backplane driver applications requiring stable component supply and long-term industrial temperature support.
Supply support for 74LVQ240SJX 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
Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing systems.
The LVQ logic family-including the 74LVQ240SJX-was engineered for low-voltage, low-noise 3.3V operation with enhanced EMI control and transmission-line drive capability in space-constrained applications.
FAQ
What is the operating voltage range for the 74LVQ240SJX?
The 74LVQ240SJX operates from 2.0V to 3.6V, with full functionality and guaranteed AC/DC specifications across this range. At VCC = 3.3V ±0.3V, it achieves optimal timing performance (tPLH/tPHL ≤10.5ns) and meets all dynamic threshold and noise immunity specs. Operation below 2.0V or above 3.6V violates recommended conditions and may cause functional failure or accelerated wear.
Does the 74LVQ240SJX support true 3-STATE output control?
Yes, the 74LVQ240SJX provides two independent active-low 3-STATE enable inputs: OE1 controls outputs O4–O7, and OE2 controls O0–O3. When either OE is HIGH, its associated outputs enter high-impedance state with leakage ≤±2.5µA. This allows flexible bus partitioning and avoids contention in multi-driver systems without requiring external logic.
Is the 74LVQ240SJX pin-compatible with standard 74-series octal buffers?
No-the 74LVQ240SJX uses a proprietary pinout optimized for EIAJ TYPE II SOP (M20D), differing from JEDEC-standard SOIC packages like the 74LV240. Pin assignments for OE1/OE2 and I/O grouping are unique to the LVQ family. Direct replacement requires PCB redesign; verify against the official connection diagram before integration.
What does "guaranteed incident wave switching into 75Ω" mean for the 74LVQ240SJX?
This specification means the 74LVQ240SJX can cleanly launch signals onto 75Ω transmission lines without external series termination resistors, even under worst-case process/voltage/temperature conditions. It ensures minimal reflection and overshoot during the first edge transit, directly supporting point-to-point clock or address routing in compact PCBs where layout space is constrained.
How does the patented EMI reduction circuitry in the 74LVQ240SJX work?
The 74LVQ240SJX employs internal slew-rate control and output-stage timing skewing to reduce peak current demand during simultaneous output transitions. This lowers high-frequency spectral content and radiated emissions-verified by Fairchild's EMI testing-without degrading propagation delay. It enables denser board layouts while easing compliance with CISPR 22 Class B emission limits.
74LVQ240SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVQ
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 12mA, 12mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74LVQ240SJX FAQ
1.How can I place an order for 74LVQ240SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVQ240SJX 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 74LVQ240SJX reliable?
The price and inventory of 74LVQ240SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVQ240SJX is usually 5 days.
3.What payment methods are accepted for 74LVQ240SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVQ240SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVQ240SJX?
74LVQ240SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVQ240SJX 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 74LVQ240SJX?
For technical support, including 74LVQ240SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVQ240SJX requirements.
6.How does Aetrix verify that 74LVQ240SJX is sourced from the original manufacturer or authorized distributors?
All 74LVQ240SJX 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 74LVQ240SJX meets industry standards.
7.What is the process for return or replacement of 74LVQ240SJX?
All 74LVQ240SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVQ240SJX, 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 74LVQ240SJX part is unused and in its original packaging.
Return procedure for 74LVQ240SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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