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onsemi 74LVX240SJ
- Part No.:
- 74LVX240SJ
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVX240SJ.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,074
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Product details
Overview
74LVX240SJ from Fairchild Semiconductor is a low-voltage octal inverting buffer/line driver with dual 3-STATE outputs, designed for memory address and clock distribution in mixed-voltage systems. It operates from 2.0V to 3.6V, tolerates 5.5V inputs, and delivers ±4mA output drive at 3.3V with propagation delays as low as 4.3ns (CL = 15pF). It is used in 3.3V bus interface applications interfacing 5V logic.
For engineers reviewing the 74LVX240SJ datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage translation capability (0–5.5V into 2.0–3.6V supply), simultaneous switching noise performance, 3-STATE timing (tPZL/tPLZ ≤ 13.0ns), and EIAJ TYPE II SOP-20 package compatibility.
Technical Context
The 74LVX240SJ implements two independent 4-bit inverting buffer groups (I0–I3/O0–O3 and I4–I7/O4–O7), each controlled by separate 3-STATE enable inputs OE1 (pins 12,14,16,18) and OE2 (pins 3,5,7,9). Its input structure supports 5V-tolerant CMOS inputs while operating from a 3.3V supply, enabling direct interfacing between 5V legacy peripherals and 3.3V logic domains.
It features guaranteed dynamic noise immunity (VOLP = 0.8V, VOLV = −0.8V at CL = 50pF, VCC = 3.3V), simultaneous switching noise limits, and matched propagation delays across channels (tOSLH/tOSHL ≤ 1.5ns), making it suitable for high-density address/data bus driving where skew and crosstalk control are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0V to 3.6V - Enables operation in standard 3.3V systems with margin for supply variation |
| Input Voltage Range | 0V to 5.5V - Allows direct connection to 5V TTL/CMOS without level-shifting circuitry |
| tPLH / tPHL | 4.3ns / 6.8ns (typ, CL = 15pF, VCC = 3.3V) - Supports >100MHz bus toggle rates in short traces |
| tPZL / tPLZ | 9.7ns / 11.4ns (max, CL = 50pF, VCC = 3.3V) - Ensures clean 3-STATE enable/disable timing for bus arbitration |
| IOH / IOL | −4mA / +4mA (VCC = 3.3V) - Drives standard 50pF loads with 0.44V VOL under full load |
| VIH / VIL | 2.4V / 0.8V (min/max, VCC = 3.6V) - Compatible with both 3.3V CMOS and 5V TTL logic thresholds |
| ICC Quiescent | 40.0µA (max, VCC = 3.6V) - Supports ultra-low static power in battery-backed or standby modes |
Pinout & Package
74LVX240SJ is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Number M20D), with standard pin pitch of 0.65mm and body dimensions 12.8mm × 5.3mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | GND | Ground reference for all I/O and internal logic; must be low-impedance connection |
| 20, 10 | VCC | Primary power supply (2.0–3.6V); requires local 0.1µF decoupling |
| 12, 14, 16, 18 | OE1 | Active-Low enable for outputs O0–O3; controls group 1 3-STATE behavior |
| 3, 5, 7, 9 | OE2 | Active-Low enable for outputs O4–O7; independent control of group 2 |
| 2, 4, 6, 8 | I0–I3 | Inverting input signals for first buffer group; 5.5V-tolerant CMOS inputs |
| 11, 13, 15, 17 | I4–I7 | Inverting input signals for second buffer group; identical electrical specs to I0–I3 |
| 18, 16, 14, 12 | O0–O3 | Inverted, 3-STATE outputs driven by I0–I3 when OE1 = LOW |
| 9, 7, 5, 3 | O4–O7 | Inverted, 3-STATE outputs driven by I4–I7 when OE2 = LOW |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant Inputs | Supports direct interface to 5V logic without external level shifters or resistors |
| Dual Independent 3-STATE Control | OE1 and OE2 allow selective disabling of two 4-bit output groups for flexible bus partitioning |
| Low Dynamic Switching Noise | Guaranteed VOLP/VOLV (±0.8V) ensures signal integrity in dense PCB layouts |
| Matched Propagation Skew | ≤1.5ns output-to-output skew enables synchronous multi-bit data/address transmission |
| Ultra-Low ICC | 40µA max quiescent current reduces system-level power budget impact in idle states |
Applications
| Memory Address Buffering | PCI/ISA Bus Interface |
|---|---|
Use Scenario: Driving 3.3V microcontroller address bus to 5V SRAM or EPROM chips. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation and fanout amplification with 3-STATE isolation during bus release. Use Value: Eliminates need for discrete level shifters; 4.3ns propagation delay maintains timing margins in 25MHz address cycles. | Use Scenario: Interfacing 3.3V embedded controller to legacy 5V PCI or ISA peripheral slots. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control per group for address/data separation. Use Value: Dual OE pins enable precise timing control over bus segments; 5.5V input tolerance prevents latch-up on 5V bus lines. |
| Low-Power Clock Distribution | Mixed-Voltage Microcontroller Peripherals |
Use Scenario: Distributing 3.3V clock signals to multiple 5V-tolerant peripherals with minimal skew. IC Role / Device Role / Timing Role: Inverting clock buffer with matched tPLH/tPHL and low tOSLH skew for phase-aligned fanout. Use Value: 1.5ns max output skew preserves clock edge alignment across 8 outputs, reducing jitter accumulation. | Use Scenario: Connecting 3.3V MCU GPIOs to 5V sensors, displays, or EEPROMs with shared bus lines. IC Role / Device Role / Timing Role: Level-translating I/O expander buffer with independent 3-STATE control for bidirectional data flow. Use Value: Enables safe 5V peripheral communication without damaging 3.3V I/O pins; 0.44V VOL ensures robust LOW detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer with 3-STATE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC240PW | Operates at 1.65–3.6V; lower VIH (1.4V min at VCC = 2.7V); no 5.5V input tolerance | Requires external level shifting for 5V inputs; better suited for pure 3.3V/2.5V systems | Select when system uses only 3.3V or lower supplies and 5V interface is unnecessary |
| SN74LV240ADW | TI part; 2.0–5.5V VCC range; 5.5V-tolerant inputs; slightly higher tPLH (5.5ns typ) | Compatible with wider supply range but lacks guaranteed dynamic noise specs of LVX series | Choose when broader VCC flexibility is needed and simultaneous switching noise is less critical |
Compared with 74LVX240SJ, the 74LVC240PW offers lower voltage operation but sacrifices 5V input tolerance, while the SN74LV240ADW extends supply range to 5.5V but omits specified dynamic noise limits-making 74LVX240SJ optimal for noise-sensitive 3.3V bus interfaces requiring guaranteed 5V-tolerant inputs.
Availability
74LVX240SJ is available at Aetrix Electronics and suitable for memory address buffering, PCI/ISA bus interface, and low-power clock distribution requiring stable component supply and long-term industrial availability.
Supply support for 74LVX240SJ 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 semiconductor company specializing in analog and power ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and embedded systems.
The 74LVX240SJ belongs to the LVX low-voltage logic family, engineered for mixed-signal interfacing between 3.3V and 5V domains with emphasis on noise immunity, low power, and board density in space-constrained designs.
FAQ
What is the maximum input voltage rating for the 74LVX240SJ?
The 74LVX240SJ supports DC input voltages up to 5.5V across the full operating temperature range (−40°C to +85°C), independent of VCC. This 5V-tolerant input capability allows direct connection to 5V logic families without external protection or level-shifting components, as confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the Fairchild datasheet DS011609.
Does the 74LVX240SJ support true 3.3V-only operation?
Yes, the 74LVX240SJ is fully specified for operation at VCC = 3.3V ±0.3V. All AC and DC parameters-including propagation delay (4.3ns typ), output drive (±4mA), and noise immunity (VOLP = 0.8V)-are guaranteed at this voltage. Its 2.0V to 3.6V supply range makes it compatible with standard 3.3V systems while retaining margin for rail droop or variation.
How are the 3-STATE outputs controlled on the 74LVX240SJ?
The 74LVX240SJ uses two independent active-low enable inputs: OE1 (pins 12,14,16,18) controls outputs O0–O3, and OE2 (pins 3,5,7,9) controls outputs O4–O7. When an OE pin is LOW, its corresponding four outputs are enabled and inverted; when HIGH, those outputs enter high-impedance state. This dual-enable architecture enables selective bus segmentation and avoids contention in multi-master environments.
What package type is used for the 74LVX240SJ?
The 74LVX240SJ is packaged in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Number M20D). It has a 0.65mm lead pitch, body size of 12.8mm × 5.3mm, and is lead-free and RoHS-compliant per Fairchild's manufacturing specifications in DS011609.
Is the 74LVX240SJ suitable for use in automotive applications?
The 74LVX240SJ is rated for operation from −40°C to +85°C and meets industrial-grade reliability standards, but it is not AEC-Q100 qualified. While it may function in non-safety-critical automotive subsystems (e.g., infotainment or body control), Fairchild's Life Support Policy explicitly excludes authorization for use in safety-critical automotive systems without written approval. For automotive designs, consult ON Semiconductor's current AEC-Q100-qualified equivalents.
74LVX240SJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVX
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 4mA, 4mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74LVX240SJ FAQ
1.How can I place an order for 74LVX240SJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVX240SJ 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 74LVX240SJ reliable?
The price and inventory of 74LVX240SJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX240SJ is usually 5 days.
3.What payment methods are accepted for 74LVX240SJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX240SJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVX240SJ?
74LVX240SJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVX240SJ 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 74LVX240SJ?
For technical support, including 74LVX240SJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX240SJ requirements.
6.How does Aetrix verify that 74LVX240SJ is sourced from the original manufacturer or authorized distributors?
All 74LVX240SJ 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 74LVX240SJ meets industry standards.
7.What is the process for return or replacement of 74LVX240SJ?
All 74LVX240SJ units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX240SJ, 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 74LVX240SJ part is unused and in its original packaging.
Return procedure for 74LVX240SJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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