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Texas Instruments SN74LVC540ADW
- Part No.:
- SN74LVC540ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC540ADW.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:543
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Product details
Overview
SN74LVC540ADW from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for bus interface and signal redriving in 1.65V–3.6V systems. It features dual active-low output enables (OE1/OE2), 5.3ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion - used in transmission line driving and controller reset hold applications.
For engineers reviewing the SN74LVC540ADW datasheet, SN74LVC540ADW pinout, SN74LVC540ADW application, or SN74LVC540ADW equivalent, key selection criteria include 3-state control logic, mixed-mode voltage compatibility (5V input / 3.3V VCC), ground bounce (<0.8V) and VOH undershoot (>2V) performance, and SOIC-20 package thermal metrics (RθJA = 114.8°C/W).
Technical Context
The SN74LVC540ADW implements eight independent inverting buffers sharing two globally controlled 3-state enable inputs (OE1 and OE2), both of which must be low to activate outputs - no partial enable mode. Its CMOS input structure accepts up to 5.5V regardless of VCC (1.65–3.6V), enabling mixed-voltage interfacing between legacy 5V logic and modern low-voltage buses.
Each output delivers ±24mA drive at 3V VCC with balanced sourcing/sinking capability and supports Ioff protection during partial power-down. The device exhibits typical output ground bounce <0.8V and VOH undershoot >2V at 3.3V/25°C, confirming robust signal integrity under fast switching into light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - enables direct integration into 1.8V/2.5V/3.3V digital systems without level shifters |
| Input Voltage Tolerance | Up to 5.5V - allows safe connection to 5V sources while powered from 3.3V or lower |
| Max Propagation Delay | 5.3ns at 3.3V - supports high-speed data redriving on PCB traces up to ~12cm before transmission line effects dominate |
| Output Drive Strength | ±24mA at 3V - sufficient to drive 50pF loads or terminate short stubs without external buffering |
| Ioff Current | ±10μA at 0V VCC - prevents back-drive current and enables hot-plug capability in modular systems |
| ESD Rating (HBM) | ±2000V - meets industrial-grade handling requirements without special ESD precautions |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
SN74LVC540ADW is packaged in a 20-pin SOIC (DW) with 12.8mm × 10.3mm footprint and 12.8mm × 7.5mm body size. Pin 1 is OE1; pins 2–9 are inputs A1–A8; pin 10 is GND; pins 11–18 are outputs Y8–Y1 (inverted order); pin 19 is OE2; pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1, OE2 | Active-low 3-state enable inputs | Both must be low to enable all eight inverted outputs; either high forces all outputs to high-impedance - critical for bus arbitration |
| A1–A8 | Buffer input terminals | CMOS inputs tolerant to 5.5V; require termination to VCC/GND when unused to prevent floating-induced oscillation |
| Y1–Y8 | Inverting buffer outputs | Provide true inverted logic (Yn = NOT An); each capable of ±24mA drive at 3V - suitable for LED indicators or transmission line termination |
| VCC | Positive supply | Supplies internal logic and output drivers; requires local 0.1μF bypass capacitor placed adjacent to pin 20 per layout guidelines |
| GND | Ground reference | Serves as return path for all output sink current and supply leakage; must maintain low-impedance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V-tolerant inputs allow interfacing with legacy 5V controllers while operating from 3.3V supply - eliminates need for external level translators |
| Ioff partial power-down | Enables safe insertion/removal in powered-backplane systems by disabling outputs when VCC = 0V - prevents back-driving of live buses |
| Balanced CMOS 3-state outputs | Equal sourcing/sinking strength (±24mA) ensures consistent rise/fall times and reduces signal distortion on bidirectional lines |
| Low ground bounce & VOH undershoot | Typical VOLP < 0.8V and VOHV > 2V at 3.3V suppress noise coupling into adjacent signals during simultaneous switching |
| Latch-up immunity | Exceeds 100mA per JESD78 - guarantees robustness against transient overcurrent events in noisy industrial environments |
Applications
| LED Indicator Driving | Digital Signal Redriving |
|---|---|
Use Scenario: Driving multiple discrete LEDs from a microcontroller GPIO bank with limited current drive. IC Role / Device Role / Timing Role: Inverting buffer providing current gain and logic inversion to match LED cathode/anode configuration. Use Value: Delivers ±24mA per channel at 3V - sufficient to illuminate standard LEDs without external transistors, reducing BOM count. | Use Scenario: Repeating a clock or data signal across a long PCB trace (>8 cm) where capacitive loading degrades edge rate. IC Role / Device Role / Timing Role: Signal repeater restoring rise/fall time and driving impedance-matched loads. Use Value: 5.3ns max tpd at 3.3V preserves timing margins; 50pF load limit aligns with typical FR4 trace capacitance for ≤12cm routing. |
| Transmission Line Driving | Controller Reset Hold |
Use Scenario: Driving a point-to-point transmission line (e.g., between FPGA and ADC) requiring controlled impedance and low reflection. IC Role / Device Role / Timing Role: Impedance-matching driver with fast edges and low ground bounce to minimize signal integrity degradation. Use Value: Balanced drive strength and <0.8V ground bounce ensure clean signal transitions even during full-bank switching. | Use Scenario: Holding a processor reset line in asserted state during power-up sequencing until voltage rails stabilize. IC Role / Device Role / Timing Role: Glitch-free 3-state latch holding reset signal low until system controller releases OE pins. Use Value: Dual OE inputs allow synchronous release of all eight channels - prevents partial reset assertion that could corrupt boot sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH16244ADGGR | 16-bit non-inverting, 3-state, 1.65–3.6V, 3.5ns tpd, VQFN-48 | Higher channel count, non-inverting logic, different pinout and package - not drop-in | Select when needing more drivers or non-inverting polarity; requires PCB redesign |
| 74LVC240APW,118 | Octal inverting buffer, 3-state, 1.65–3.6V, 5.5ns tpd, TSSOP-20 | Same logic function and electrical specs; differs only in package (TSSOP vs SOIC) and minor thermal metrics | Direct functional replacement with identical pinout - suitable for footprint-compatible upgrades |
Compared with SN74LVC540ADW, SN74LVCH16244ADGGR offers higher density but requires layout change and logic inversion adjustment, while 74LVC240APW,118 provides identical functionality in TSSOP-20 - making it the preferred alternative for space-constrained designs where SOIC footprint is not required.
Availability
SN74LVC540ADW is available at Aetrix Electronics and suitable for industrial control interfaces, automotive body electronics, and embedded system bus expansion requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVC540ADW 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 company delivering analog and embedded processing solutions, with leadership in logic, power management, and signal chain technologies.
The SN74LVC540ADW belongs to TI's LVC logic family - engineered for low-voltage, high-speed, mixed-signal interfacing in space- and power-constrained applications such as portable instrumentation and modular industrial I/O.
FAQ
What is the logic function implemented by SN74LVC540ADW?
The SN74LVC540ADW implements eight independent inverting buffers (Yn = NOT An) with 3-state outputs. Both OE1 and OE2 must be driven low to enable output drive; any high OE forces all outputs into high-impedance. This dual-enable architecture prevents accidental bus contention during power sequencing - a key design feature confirmed in the functional table of the official datasheet.
Can SN74LVC540ADW interface between 5V and 3.3V systems?
Yes, SN74LVC540ADW supports mixed-mode operation: its inputs tolerate up to 5.5V regardless of VCC (1.65–3.6V), allowing direct connection to 5V logic outputs while powered from 3.3V. Outputs swing rail-to-rail (0V to VCC), so 3.3V outputs remain compatible with 3.3V receivers. This eliminates external level shifters in many interface scenarios, as verified in Section 7.3.1 of the TI datasheet.
What is the maximum capacitive load SN74LVC540ADW can drive while meeting specifications?
SN74LVC540ADW is specified to drive loads ≤50pF while maintaining guaranteed timing (tpd ≤5.3ns) and DC output voltage levels (VOH/VOL). Exceeding 50pF increases propagation delay and may degrade noise margins - this limit is explicitly stated in Section 8.2.1.1 of the TI datasheet and validated by load circuit testing conditions (CL = 50pF at 3.3V).
Does SN74LVC540ADW support hot-plug or live insertion?
Yes, SN74LVC540ADW supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance regardless of input or OE states, limiting Ioff leakage to ±10μA. This prevents back-driving of powered subsystems during board insertion - a requirement verified per JESD78 latch-up testing and documented in Section 7.3.2 of the datasheet.
What decoupling capacitor value is recommended for SN74LVC540ADW?
A 0.1μF ceramic capacitor is recommended for SN74LVC540ADW, placed physically adjacent to the VCC pin (pin 20) with a low-inductance ground return path. TI's layout guidelines (Section 8.4.1) specify this value to suppress high-frequency supply noise generated during simultaneous output switching - and note that paralleling with a 1μF capacitor improves broadband suppression.
SN74LVC540ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVC540ADW FAQ
1.How can I place an order for SN74LVC540ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC540ADW 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 SN74LVC540ADW reliable?
The price and inventory of SN74LVC540ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540ADW is usually 5 days.
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SN74LVC540ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC540ADW 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 SN74LVC540ADW?
For technical support, including SN74LVC540ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540ADW requirements.
6.How does Aetrix verify that SN74LVC540ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVC540ADW 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 SN74LVC540ADW meets industry standards.
7.What is the process for return or replacement of SN74LVC540ADW?
All SN74LVC540ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540ADW, 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 SN74LVC540ADW part is unused and in its original packaging.
Return procedure for SN74LVC540ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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