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Texas Instruments SN74LVC540ADWG4
- Part No.:
- SN74LVC540ADWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC540ADWG4.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,721
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Product details
Overview
SN74LVC540ADWG4 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 SN74LVC540ADWG4 datasheet, SN74LVC540ADWG4 pinout, SN74LVC540ADWG4 application, or SN74LVC540ADWG4 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 thermal metrics for TSSOP-20 packaging.
Technical Context
The SN74LVC540ADWG4 implements eight independent inverting buffers sharing two synchronized active-low output enable inputs (OE1 and OE2), both of which must be low to activate all outputs. 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.
It employs balanced CMOS 3-state outputs capable of sourcing/sinking ±24mA at 3V, with Ioff circuitry ensuring high-impedance isolation during power-down. The device meets JESD78 latch-up immunity (>100mA) and supports controlled signal integrity via low ground bounce (VOLP < 0.8V) and undershoot suppression (VOHV > 2V) at 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65V to 3.6V - Enables operation across LVC-family voltage domains including 1.8V, 2.5V, and 3.3V systems. |
| Input Voltage Tolerance | Up to 5.5V - Allows direct connection to 5V logic without level-shifting, critical for mixed-mode bus interfacing. |
| Max Propagation Delay | 5.3ns at VCC = 3.3V - Supports high-speed data redriving on PCB traces up to 12cm without signal degradation. |
| Output Drive Strength | ±24mA at VCC = 3V - Sufficient to drive 50pF loads and moderate transmission lines while maintaining VOL ≤ 0.55V and VOH ≥ 2.2V. |
| Ioff Current | ±10μA at VI/VO = 5.5V - Ensures safe live insertion and partial power-down by disabling output current flow when VCC = 0V. |
| ESD Rating (HBM) | ±2000V - Meets industrial-grade ESD robustness per ANSI/ESDA/JEDEC JS-001 for reliable handling and board assembly. |
| Operating Temperature | –40°C to +125°C - Qualified for extended industrial and automotive under-hood environments. |
Pinout & Package
SN74LVC540ADWG4 is packaged in a 20-pin TSSOP (PW) with 0.65mm pitch, body size 6.5mm × 4.4mm, and overall footprint 6.5mm × 6.4mm. This RoHS-compliant surface-mount package supports automated assembly and offers thermal resistance RθJA = 120.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1, OE2 | Active-low 3-state enable inputs | Both must be low to enable all eight inverting outputs; tie either to VCC via pull-up for power-up high-impedance safety. |
| A1–A8 | Buffer input terminals | Eight independent logic inputs; each drives corresponding inverted output Y1–Y8 when enabled. |
| Y1–Y8 | Inverting 3-state outputs | Provide true complement of A1–A8 signals; enter high-Z state when OE1 or OE2 is high - prevents bus contention. |
| VCC | Positive supply | Supplies core logic and output drivers; requires local 0.1μF bypass capacitor placed adjacent to pin 20. |
| GND | Ground reference | Common return path for all inputs, outputs, and supply current; must be low-impedance with unbroken ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V-tolerant inputs allow seamless interfacing between 5V peripherals and 3.3V controllers without external level shifters. |
| Low ground bounce (VOLP) | Typical <0.8V at VCC = 3.3V ensures stable logic LOW levels during simultaneous output switching, reducing noise coupling. |
| Controlled VOH undershoot (VOHV) | Typical >2V at VCC = 3.3V maintains valid HIGH-level margins during fast edge transitions, improving receiver margin. |
| Ioff partial power-down | Prevents back-drive current and enables hot-plug capability by disabling outputs when VCC = 0V - essential for modular systems. |
| 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 low-current microcontroller GPIO bank. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control acts as current-sinking driver; OE pins coordinate LED on/off sequencing. Use Value: Delivers ±24mA per channel at 3.3V to directly illuminate LEDs without external transistors, reducing BOM count and layout area. | Use Scenario: Reconditioning degraded clock or data signals traversing long PCB traces (>8 cm) between FPGA and peripheral ICs. IC Role / Device Role / Timing Role: Redriver restoring edge rate and voltage swing; 5.3ns tpd preserves timing budget in synchronous interfaces. Use Value: Compensates for capacitive loading up to 50pF while maintaining VOL ≤ 0.55V and VOH ≥ 2.2V - extends reliable trace length beyond microcontroller drive limits. |
| Transmission Line Driving | Controller Reset Hold |
Use Scenario: Driving unterminated or lightly terminated 50Ω PCB traces in point-to-point digital links. IC Role / Device Role / Timing Role: Impedance-matched buffer providing clean edge transitions; source termination supported via series damping resistor. Use Value: Low ground bounce and controlled undershoot minimize reflections and jitter, enabling reliable operation at >50MHz data rates on 12cm traces. | Use Scenario: Holding system bus lines in known state during processor reset or firmware update cycles. IC Role / Device Role / Timing Role: 3-state buffer isolating downstream logic; OE pins synchronized to reset assertion to force high-Z bus state. Use Value: Prevents spurious writes or reads during reset by decoupling bus segments - eliminates need for external bus keepers or pull resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APWRE4 | Same functional logic (octal inverting 3-state), but uses single OE pin instead of dual OE1/OE2; identical TSSOP-20 package and electrical specs. | Lacks independent dual-enable control; unsuitable where staggered or redundant enable signaling is required. | Select when simplified enable architecture suffices and board layout rework for pinout change is acceptable. |
| 74LVC541ADGVRE4 | Non-inverting octal buffer with dual OE; otherwise matches supply range, speed (5.3ns), and Ioff. Pinout differs (Y1–Y8 on opposite side). | Delivers true (non-inverted) output logic - required where signal polarity must be preserved across the buffer stage. | Choose when system logic demands non-inverted buffering and dual-OE control; verify PCB layout compatibility with TVSOP-20 footprint. |
Compared with SN74LVC540ADWG4, SN74LVC240APWRE4 simplifies enable control at the cost of functional flexibility, while 74LVC541ADGVRE4 preserves signal polarity but requires layout adaptation - both serve distinct design constraints rather than drop-in replacements.
Availability
SN74LVC540ADWG4 is available at Aetrix Electronics and suitable for industrial automation interfaces, embedded controller bus expansion, and automotive infotainment signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVC540ADWG4 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 leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability interface ICs.
The SN74LVC540ADWG4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed bus interfacing in mixed-voltage systems - targeting industrial control, communications infrastructure, and automotive subsystems.
FAQ
What is the function of OE1 and OE2 on the SN74LVC540ADWG4?
OE1 and OE2 are active-low output enable inputs that jointly control all eight inverting buffers. Both pins must be driven low to activate outputs Y1–Y8; if either is high, all outputs enter high-impedance state. This dual-enable architecture provides redundancy and noise immunity - for example, tying OE1 to system reset and OE2 to software control allows fail-safe bus isolation. The SN74LVC540ADWG4 datasheet confirms this behavior in Table 7-1 (Function Table) and Section 7.1.
Can SN74LVC540ADWG4 interface 5V logic with a 3.3V microcontroller?
Yes - the SN74LVC540ADWG4 accepts input voltages up to 5.5V while operating from a 3.3V supply, enabling direct connection to 5V peripherals without level shifters. Its inputs are 5V-tolerant across the full recommended operating range (1.65V–3.6V VCC), and its outputs swing rail-to-rail (0V to VCC) with 5.5V-tolerant 3-state off-state. This mixed-mode capability is explicitly verified in Section 5.3 (Recommended Operating Conditions) and Feature 6 of the datasheet.
What is the maximum capacitive load SN74LVC540ADWG4 can drive while meeting specifications?
The SN74LVC540ADWG4 is characterized to drive loads ≤50pF while maintaining all AC and DC specifications, including propagation delay (tpd ≤5.3ns), VOL ≤0.55V, and VOH ≥2.2V at VCC = 3V. Exceeding 50pF increases rise/fall times and may violate timing margins or cause ringing - guidance is provided in Section 8.2.1.1 and Figure 8-2 (simulated signal integrity). For heavier loads, consider adding series damping resistors or using multiple parallel channels of the SN74LVC540ADWG4.
Does SN74LVC540ADWG4 support hot-swap or live-insertion applications?
Yes - the SN74LVC540ADWG4 incorporates Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current and protecting powered circuitry during hot-plug events. Ioff leakage is specified at ±10μA (Section 5.5), and the feature is validated per JEDEC JESD78 latch-up testing (>100mA). This makes the SN74LVC540ADWG4 suitable for modular backplane designs and field-replaceable units where cards are inserted into live backplanes.
What decoupling capacitor value is recommended for SN74LVC540ADWG4?
A 0.1μF ceramic capacitor is recommended for local VCC–GND decoupling on the SN74LVC540ADWG4, placed physically adjacent to pin 20 (VCC) and pin 10 (GND) with minimal trace length. TI's Layout Guidelines (Section 8.4.1) specify this value to suppress high-frequency noise and stabilize supply during fast output transitions. For enhanced broadband filtering, a parallel 1μF capacitor may be added - but the 0.1μF unit remains mandatory and must be the closest to the device.
SN74LVC540ADWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74LVC540ADWG4 FAQ
1.How can I place an order for SN74LVC540ADWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC540ADWG4 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 SN74LVC540ADWG4 reliable?
The price and inventory of SN74LVC540ADWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540ADWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC540ADWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC540ADWG4 transactions.
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4.How is shipping managed for SN74LVC540ADWG4?
SN74LVC540ADWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC540ADWG4 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 SN74LVC540ADWG4?
For technical support, including SN74LVC540ADWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540ADWG4 requirements.
6.How does Aetrix verify that SN74LVC540ADWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC540ADWG4 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 SN74LVC540ADWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC540ADWG4?
All SN74LVC540ADWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540ADWG4, 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 SN74LVC540ADWG4 part is unused and in its original packaging.
Return procedure for SN74LVC540ADWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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