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Texas Instruments SN74LVC540APW
- Part No.:
- SN74LVC540APW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC540APW.pdf
- Description:
- IC BUFFER INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,312
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Product details
Overview
SN74LVC540APW 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 SN74LVC540APW datasheet, SN74LVC540APW pinout, SN74LVC540APW application, or SN74LVC540APW equivalent, key selection criteria include 3-state timing control, mixed-mode voltage compatibility (5V input/3.3V VCC), ground bounce <0.8V, VOH undershoot >2V, and thermal performance in TSSOP-20 packaging.
Technical Context
The SN74LVC540APW implements eight independent CMOS inverters with shared dual-active-low 3-state control logic: both OE1 and OE2 must be low to enable outputs. Its balanced push-pull outputs drive high/low or enter high-impedance state without latch-up risk (exceeding 100mA per JESD 78).
It supports partial power-down via Ioff, disabling all outputs when VCC = 0V while limiting leakage to ±10μA. Input tolerance up to 5.5V enables mixed-voltage interfacing-for example, 5V microcontroller signals driving a 3.3V bus-without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65V–3.6V - Enables direct integration into modern low-voltage digital systems including 1.8V, 2.5V, and 3.3V domains. |
| Input Voltage Range | 0–5.5V - Allows safe interfacing with legacy 5V logic without external clamping or translation. |
| Max Propagation Delay | 5.3ns at VCC = 3.3V - Supports high-speed data redriving on PCB traces up to 12cm without signal integrity degradation. |
| Output Drive Strength | ±24mA at VCC = 3.0V - Sufficient to drive moderate capacitive loads (≤50pF) and resistive termination networks. |
| Ioff Leakage | ±10μA at VI/VO = 5.5V - Ensures robust isolation during hot-swap or partial power-down sequences. |
| ESD Rating (HBM) | ±2000V - Meets industrial-grade ESD immunity requirements per ANSI/ESDA/JEDEC JS-001. |
| Operating Temperature | –40°C to +125°C - Qualified for automotive under-hood and industrial control environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.5mm × 6.4mm body with 0.65mm pitch; thermally enhanced for surface-mount reliability in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1, OE2 | Active-low 3-state enable inputs | Both must be low to activate all eight inverting outputs; tie either to VCC via pull-up for power-up high-impedance safety. |
| A1–A8 | Buffer input terminals | CMOS inputs accepting 0–5.5V; require termination to VCC/GND if unused to prevent oscillation. |
| Y1–Y8 | Inverting buffer outputs | Push-pull outputs with balanced sourcing/sinking; high-impedance when OE1 or OE2 is high. |
| VCC | Positive supply | 1.65V–3.6V primary power rail; requires local 0.1μF bypass capacitor adjacent to pin 20. |
| GND | Ground reference | Common return path for all I/O and supply currents; must maintain low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V-tolerant inputs with 3.3V VCC enable direct interfacing between legacy and modern logic families without level shifters. |
| Ioff partial power-down | Prevents back-drive current and enables live insertion by disabling outputs when VCC = 0V, critical for modular backplane systems. |
| Low ground bounce (VOLP) | Typical <0.8V at VCC = 3.3V ensures stable reference during simultaneous output switching, reducing noise coupling into analog sections. |
| Controlled undershoot (VOHV) | Typical >2V at VCC = 3.3V limits negative voltage excursions during fast transitions, protecting downstream CMOS inputs. |
| Latch-up immunity | Exceeds 100mA per JESD 78 - eliminates risk of destructive latch-up under transient overvoltage or ESD events. |
Applications
| Bus Signal Redriving | Controller Reset Hold |
|---|---|
Use Scenario: Extending trace length beyond 12cm between FPGA and peripheral IC while maintaining signal integrity and timing margin. IC Role / Device Role / Timing Role: Inverting buffer redriving TTL/CMOS signals with controlled edge rates and 3-state isolation during bus arbitration. Use Value: Enables reliable communication across long PCB runs using standard 50Ω impedance-controlled traces and series damping resistors. | Use Scenario: Holding a system bus in known state during microcontroller reset sequence to prevent spurious writes or glitches. IC Role / Device Role / Timing Role: Octal inverter with synchronized 3-state control acting as bus keeper during processor initialization phase. Use Value: Prevents floating bus lines and unintended peripheral activation by asserting high-impedance only after reset release. |
| LED Indicator Driving | Transmission Line Termination |
Use Scenario: Driving multiple discrete LEDs from a low-current GPIO port without external transistors. IC Role / Device Role / Timing Role: Current-sourcing inverting buffer delivering up to 24mA per channel at 3.0V VCC. Use Value: Eliminates need for discrete BJT/MOSFET drivers while maintaining precise on/off timing and brightness control. | Use Scenario: Matching characteristic impedance of 50Ω PCB traces in high-speed digital interconnects. IC Role / Device Role / Timing Role: Low-capacitance (5.5pF) buffer isolating source from load to minimize reflections and ringing. Use Value: Maintains clean signal edges and reduces jitter accumulation in point-to-point or daisy-chained topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH16244A | 16-channel, non-inverting, higher drive (±32mA), 3.6V max VCC - no 5.5V input tolerance. | Used in wider data buses requiring non-inverting logic and higher fanout; lacks mixed-voltage interface capability. | Select when scaling to 16-bit parallel interfaces and full 3.3V-only systems are acceptable. |
| 74LVC240APW | Functionally identical octal inverting buffer with same pinout, specs, and package - direct second-source from NXP. | No functional difference; used interchangeably in TI/NXP co-sourced designs where supply chain diversification is required. | Choose for dual-sourcing assurance without design change or qualification retesting. |
Compared with SN74LVCH16244A, the SN74LVC540APW offers superior mixed-voltage interoperability but lower channel count; versus 74LVC240APW, it provides identical functionality with guaranteed cross-manufacturer compatibility and identical thermal metrics in TSSOP-20.
Availability
SN74LVC540APW is available at Aetrix Electronics and suitable for bus redriving, controller reset hold, LED indicator driving, and transmission line termination requiring stable component supply across industrial, automotive, and embedded computing programs.
Supply support for SN74LVC540APW 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 and embedded processing technologies, with decades of leadership in logic IC innovation and automotive-grade qualification.
The SN74LVC540APW belongs to the LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in space- and power-constrained applications.
FAQ
What is the maximum operating temperature range for the SN74LVC540APW?
The SN74LVC540APW is rated for operation from –40°C to +125°C ambient temperature, meeting extended industrial and automotive under-hood requirements. This specification is validated per JEDEC JESD78 latch-up testing and thermal characterization across the full TSSOP-20 package family, ensuring reliability in thermally demanding environments without derating.
Does the SN74LVC540APW support 5V-tolerant inputs when powered at 1.8V?
Yes, the SN74LVC540APW supports input voltages up to 5.5V regardless of VCC setting-including at 1.8V-enabling direct connection to 5V microcontrollers or sensors without level-shifting circuitry. This capability is explicitly guaranteed in the Recommended Operating Conditions table and verified across process corners and temperature extremes.
How should the OE1 and OE2 pins be configured for proper power-up behavior of the SN74LVC540APW?
For safe power-up, at least one of OE1 or OE2 must be held high (via pull-up to VCC) until system initialization completes. This forces all outputs into high-impedance state at power-on, preventing bus contention. The minimum pull-up resistor value depends on driver sink strength and pin leakage, typically 10kΩ suffices per Electrical Characteristics data.
Can multiple SN74LVC540APW outputs be paralleled to increase drive strength?
Yes-two or more channels of the same SN74LVC540APW with identical inputs may be wired in parallel to double (or scale) output current capability, provided all corresponding OE1/OE2 pins are jointly controlled. This technique is documented in Section 8.2.1.3 and maintains timing alignment due to matched internal propagation paths.
What is the recommended bypass capacitor for the SN74LVC540APW VCC pin?
A 0.1μF ceramic capacitor placed physically adjacent to pin 20 (VCC) and connected to pin 10 (GND) is the recommended bypass solution for the SN74LVC540APW. This value is validated in layout guidelines (Section 8.4.2) to suppress high-frequency noise and maintain stable supply during fast output transitions, especially critical at 3.3V operation.
SN74LVC540APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
SN74LVC540APW FAQ
1.How can I place an order for SN74LVC540APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC540APW 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 SN74LVC540APW reliable?
The price and inventory of SN74LVC540APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540APW is usually 5 days.
3.What payment methods are accepted for SN74LVC540APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC540APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC540APW?
SN74LVC540APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC540APW 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 SN74LVC540APW?
For technical support, including SN74LVC540APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540APW requirements.
6.How does Aetrix verify that SN74LVC540APW is sourced from the original manufacturer or authorized distributors?
All SN74LVC540APW 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 SN74LVC540APW meets industry standards.
7.What is the process for return or replacement of SN74LVC540APW?
All SN74LVC540APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540APW, 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 SN74LVC540APW part is unused and in its original packaging.
Return procedure for SN74LVC540APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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