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onsemi 74LVT240WMX
- Part No.:
- 74LVT240WMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT240WMX.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
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Product details
Overview
74LVT240WMX 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 interfacing to 5V TTL buses. It operates from 2.7V to 3.6V VCC, delivers ±32mA/±64mA drive strength, and features live insertion/extraction support with power-up/down high-impedance behavior.
For engineers reviewing the 74LVT240WMX datasheet, pinout, applications, or equivalent options, key selection criteria include its 20-pin SOIC package, bus-hold–free input architecture (distinguishing it from LVTH variants), 3.8ns max propagation delay at 3.3V, and compatibility with legacy 74-series 240 logic functions in mixed-voltage board designs.
Technical Context
The 74LVT240WMX implements eight independent inverting buffers, each with dual 3-STATE enable inputs (OE1/OE2) controlling four outputs per group. Its BiCMOS process enables TTL-level interface capability while maintaining low static current - ICCZ = 0.19mA when outputs are disabled.
It supports hot-plug operation via glitch-free bus loading during power transitions and meets ESD robustness requirements of >2000V (HBM), >200V (MM), and >1000V (CDM). Input voltage tolerance extends to 5.5V, allowing safe interfacing with 5V signal sources without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Specifies valid supply rail for guaranteed logic operation and output drive compliance |
| IOH/IOL | –32mA / +64mA - Sustained output sourcing/sinking capability into 500Ω loads at VCC = 3.3V |
| tPLH/tPHL | Max 3.8ns / 4.0ns - Propagation delay from input to enabled output under CL = 50pF, RL = 500Ω load |
| VIH/VIL | 2.0V / 0.8V - Valid TTL-compatible input thresholds enabling direct connection to 5V logic families |
| ICCZ | 0.19mA - Quiescent supply current when all outputs are in 3-STATE, critical for low-power standby modes |
| CIN/COUT | 3pF / 6pF - Low input/output capacitance minimizing signal integrity degradation on high-speed buses |
| Operating Temp | –40°C to +85°C - Industrial-grade thermal range supporting deployment in embedded control and telecom infrastructure |
Pinout & Package
74LVT240WMX is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide package (M20B), with standard pin pitch of 1.27mm and body width of 7.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enable inputs controlling outputs O0–O3 (OE1) and O4–O7 (OE2) |
| 2–9 | I0–I7 | Inverting data inputs; no bus-hold circuitry - external pull-ups required if left unconnected |
| 11–18 | O0–O7 | Inverting 3-STATE outputs; capable of –32mA sourcing and +64mA sinking |
| 10 | GND | Ground reference for all internal circuitry and output drivers |
| 20 | VCC | Primary 3.3V supply input; tolerant to 5.5V transient input voltages on I/O pins |
Key Features
| Feature | Design Value |
|---|---|
| Inverting octal buffering | Provides eight matched, phase-inverted signal paths ideal for address/data bus inversion and fanout expansion |
| TTL-compatible 5V input interface | Accepts 0–5.5V input signals directly without level translation, simplifying mixed-voltage system integration |
| Live insertion/extraction support | Enables hot-swap capability in backplane and modular systems without disrupting bus operation |
| Glitch-free power sequencing | Outputs enter high-impedance state during VCC ramp-up/down, preventing bus contention during power transitions |
| Low dynamic power consumption | Typical ICC = 5mA when all outputs driven LOW at 3.6V, reducing thermal load in dense PCB layouts |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving parallel address lines from a 3.3V microcontroller to multiple 5V SRAM or Flash devices on the same bus. IC Role / Device Role / Timing Role: Inverting octal buffer translating and strengthening address signals while maintaining timing alignment across eight lines. Use Value: Eliminates need for discrete level shifters and reduces board space versus individual gate solutions, with skew <1.0ns between outputs. |
Use Scenario: Distributing a single system clock to multiple 5V peripherals (e.g., UARTs, timers) from a 3.3V FPGA or ASIC. IC Role / Device Role / Timing Role: Low-skew, high-drive clock driver ensuring simultaneous edge delivery across eight destinations. Use Value: Maintains signal integrity with 6pF output capacitance and 4.0ns max tPHL, minimizing jitter accumulation in synchronous systems. |
| Bus Transceiver Interface | Legacy System Upgrade |
Use Scenario: Bidirectional data bus isolation between a modern 3.3V processor and legacy 5V ISA or VME peripheral cards. IC Role / Device Role / Timing Role: Direction-controlled line driver/receiver providing controlled impedance and drive strength matching older bus standards. Use Value: Supports live insertion and handles 5V-tolerant inputs, enabling field-upgradeable backplane modules without redesign. |
Use Scenario: Replacing obsolete 74F240 or 74AS240 in industrial PLC I/O modules requiring extended temperature operation. IC Role / Device Role / Timing Role: Pin-compatible functional replacement delivering identical inverting buffer behavior with lower power and wider VCC margin. Use Value: Reduces supply current by >60% versus 74F240 while maintaining 3.8ns propagation delay and full –40°C to +85°C operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH240WMX | Includes bus-hold inputs; eliminates need for external pull-ups on unused inputs | Better suited for systems with floating or intermittently driven inputs; higher II(HOLD) leakage current | Select 74LVTH240WMX only if bus-hold functionality is required; otherwise 74LVT240WMX offers lower input leakage (±1µA vs ±75µA) |
| SN74LVC240APWR | CMOS-based; lower ICCZ (0.1µA), but reduced drive (–24mA/+24mA); no 5V-tolerant inputs | Requires level-shifting for 5V interfaces; suitable only in pure 3.3V domains with strict power budgets | Choose SN74LVC240APWR for ultra-low quiescent power in 3.3V-only systems; avoid where 5V signal compatibility is needed |
Compared with 74LVTH240WMX and SN74LVC240APWR, the 74LVT240WMX uniquely balances 5V-tolerant input capability, robust ±32mA/±64mA drive, and absence of bus-hold circuitry - making it optimal for deterministic, externally controlled bus environments where input states are always actively driven.
Availability
74LVT240WMX is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, bus transceiver interfaces, and legacy system upgrades requiring stable component supply and long-term industrial availability.
Supply support for 74LVT240WMX 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 mixed-signal ICs, power management, and logic devices before its acquisition by ON Semiconductor in 2016.
The 74LVT240WMX belongs to Fairchild's LVT (Low-Voltage TTL) logic family, engineered for high-speed 3.3V operation with backward compatibility to 5V TTL systems in computing, industrial control, and communications infrastructure.
FAQ
What is the function of OE1 and OE2 on the 74LVT240WMX?
The 74LVT240WMX uses OE1 and OE2 as active-low 3-STATE enable inputs: OE1 controls outputs O0–O3, and OE2 controls O4–O7. When either enable is HIGH, its associated four outputs enter high-impedance state; both must be LOW for full octal output activation. This allows independent group control for partial bus driving or multiplexed addressing schemes.
Does the 74LVT240WMX have bus-hold circuitry on its inputs?
No, the 74LVT240WMX does not include bus-hold circuitry - that feature is exclusive to the 74LVTH240 variant. Inputs I0–I7 on the 74LVT240WMX require external pull-up or pull-down resistors if left unconnected to prevent floating states and potential noise-induced switching.
Can the 74LVT240WMX safely interface with 5V logic signals?
Yes, the 74LVT240WMX supports 5V-tolerant inputs: VI can range from 0V to 5.5V regardless of VCC (2.7–3.6V), enabling direct connection to 5V TTL outputs without level shifters. Its outputs swing rail-to-rail within the 3.3V domain but maintain sufficient noise margin for 5V receivers.
What is the maximum output drive capability of the 74LVT240WMX?
The 74LVT240WMX delivers –32mA sourcing current (IOH) and +64mA sinking current (IOL) per output at VCC = 3.3V, meeting or exceeding standard TTL drive requirements. This allows direct driving of multiple 5V TTL inputs or termination-resistor-loaded buses without additional buffers.
Is the 74LVT240WMX suitable for hot-swap applications?
Yes, the 74LVT240WMX supports live insertion/extraction due to its power-up/down high-impedance behavior: outputs automatically enter 3-STATE during VCC ramp-up or ramp-down, preventing bus contention or signal glitches when modules are inserted or removed under power.
74LVT240WMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LVT240WMX FAQ
1.How can I place an order for 74LVT240WMX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT240WMX 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 74LVT240WMX reliable?
The price and inventory of 74LVT240WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT240WMX is usually 5 days.
3.What payment methods are accepted for 74LVT240WMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT240WMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT240WMX?
74LVT240WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT240WMX 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 74LVT240WMX?
For technical support, including 74LVT240WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT240WMX requirements.
6.How does Aetrix verify that 74LVT240WMX is sourced from the original manufacturer or authorized distributors?
All 74LVT240WMX 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 74LVT240WMX meets industry standards.
7.What is the process for return or replacement of 74LVT240WMX?
All 74LVT240WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT240WMX, 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 74LVT240WMX part is unused and in its original packaging.
Return procedure for 74LVT240WMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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