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Texas Instruments SN74LVC540APWR
- Part No.:
- SN74LVC540APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC540APWR.pdf
- Description:
- IC BUFFER INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,232
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Product details
Overview
SN74LVC540APWR 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-enabling use in hot-swap backplane buffers and mixed-voltage I/O isolation.
For engineers reviewing the SN74LVC540APWR datasheet, SN74LVC540APWR pinout, SN74LVC540APWR application, or SN74LVC540APWR equivalent, key selection criteria include its flow-through TSSOP-20 pinout, balanced CMOS 3-state drive capability (±24mA at 3V), ground bounce <0.8V, and compatibility with 5V input signals while operating from a 3.3V supply.
Technical Context
The SN74LVC540APWR implements eight independent inverting logic gates (Yn = NOT An) with shared dual-output-enable control: both OE1 and OE2 must be low to activate all outputs. Its 3-state outputs are fully compatible with mixed-mode operation-accepting 5.5V inputs while VCC is as low as 1.65V-making it suitable for voltage-level translation between legacy 5V peripherals and modern 3.3V controllers.
It integrates partial power-down (Ioff) circuitry that disables all outputs when VCC = 0V, limiting leakage to ±10μA, and meets JESD78 latch-up immunity >100mA. The device uses standard CMOS inputs with 4pF typical input capacitance and supports fast edge rates without oscillation when input transitions meet specified slew requirements.
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 logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5V - Allows safe interfacing with 5V TTL or legacy microcontrollers without external clamping. |
| Max Propagation Delay | 5.3ns at VCC = 3.3V - Supports reliable operation in high-speed digital buses up to ~100MHz clock-equivalent timing. |
| Output Drive Strength | ±24mA at VCC = 3V - Sufficient to drive 50Ω transmission lines or multiple CMOS loads without external buffering. |
| Ioff Leakage | ±10μA at VI/VO = 5.5V - Ensures robust isolation during partial power-down, critical for hot-plug PCIe or modular backplane designs. |
| 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 extended-temperature automotive and industrial control applications. |
Pinout & Package
Packaged in a 20-pin TSSOP (PW), the SN74LVC540APWR measures 6.5mm × 6.4mm with a 0.65mm pitch and exposed thermal pad (not electrically connected). This compact, surface-mount package supports automated assembly and offers improved thermal performance over SOIC variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1, OE2 | Active-low output enable inputs | Both must be low to enable all eight inverted outputs; high on either forces all Y1–Y8 into high-impedance state. |
| A1–A8 | Buffer input terminals | Correspond one-to-one with Y1–Y8; each accepts 0–5.5V logic signals regardless of VCC level. |
| Y1–Y8 | Inverting 3-state outputs | Each provides true inversion (Yn = NOT An) with CMOS-compatible VOH/VOL and ±24mA drive capability. |
| VCC | Positive supply | Single 1.65–3.6V rail powers all logic and output stages; no separate I/O voltage required. |
| GND | Ground reference | Common return path for supply and signal currents; decoupling capacitor must connect directly here. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V-tolerant inputs enable seamless interfacing between 5V peripherals and 3.3V system-on-chip controllers without external level translators. |
| Flow-through pinout | Input A1–A8 and output Y1–Y8 are arranged linearly (A1/Y1 adjacent, A2/Y2 adjacent, etc.), minimizing PCB trace crossovers and simplifying layout in dense bus routing. |
| Ioff partial power-down | Outputs automatically enter high-Z when VCC = 0V, preventing back-driving and enabling safe live insertion into powered-backplane systems. |
| Balanced CMOS 3-state outputs | Symmetric sink/source capability (±24mA) ensures clean signal edges into capacitive or resistive loads, reducing need for external termination. |
| Low ground bounce | Typical VOLP < 0.8V at VCC = 3.3V minimizes noise coupling into shared ground planes-critical for mixed-signal PCBs with ADCs or precision analog sections. |
Applications
| Bus Isolation in Industrial PLCs | Hot-Swappable Module Interface |
|---|---|
Use Scenario: Isolating field I/O modules from a central 3.3V controller in programmable logic controllers where modules may be inserted or removed under power. IC Role / Device Role / Timing Role: SN74LVC540APWR acts as a direction-controlled, 3-state bus buffer-passing sensor data from 5V input modules to the controller while blocking reverse current during module removal. Use Value: Ioff protection prevents back-driving of the powered controller bus; 5.5V input tolerance eliminates need for discrete clamping diodes on each channel. | Use Scenario: Enabling hot-swap capability in modular test equipment where daughterboards with different supply voltages plug into a common backplane. IC Role / Device Role / Timing Role: SN74LVC540APWR serves as a voltage-translating redriver between 5V FPGA I/O banks and 3.3V host processor interfaces, with OE1/OE2 synchronized to insertion detection logic. Use Value: Dual OE control allows precise sequencing-outputs disabled before physical connection, then enabled only after stable power and communication handshake. |
| Transmission Line Redriving | Controller Reset Hold Circuit |
Use Scenario: Driving long PCB traces (>12 cm) between a microcontroller and remote display or sensor node where signal integrity degrades due to capacitive loading. IC Role / Device Role / Timing Role: SN74LVC540APWR functions as a low-skew, high-drive redriver-reconditioning digital control signals (e.g., SPI clock, chip select) before transmission across lossy interconnects. Use Value: 5.3ns tpd and ±24mA drive ensure clean edges at receiver end; flow-through pinout simplifies matched-length trace routing for differential-like timing alignment. | Use Scenario: Holding peripheral enable lines in a known state during microcontroller reset to prevent spurious activation of motors, relays, or displays. IC Role / Device Role / Timing Role: SN74LVC540APWR operates as a controlled inverter-its outputs held high-Z until reset completes, then driven low to assert peripheral reset or enable signals. Use Value: Active-low OE pins allow simple RC-based reset synchronization; 3-state behavior guarantees no contention during 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 |
|---|---|---|---|
| SN74LVC240APWR | Same functionality and pinout; identical electrical specs; differs only in internal logic labeling (240 vs 540 family naming). | No functional difference-TI documents SN74LVC240A and SN74LVC540A as functionally interchangeable with identical timing and drive. | Select SN74LVC240APWR if preferred in BOMs referencing "240" nomenclature; no design change required. |
| 74LVC540AD,212 (Nexperia) | SO20 package only; same 1.65–3.6V VCC range and 5.5V input tolerance; slightly higher max tpd (6.0ns @ 3.3V). | Valid for board space-constrained designs where TSSOP is not required; lower thermal resistance in SO20 may benefit high-duty-cycle applications. | Choose 74LVC540AD,212 for cost-sensitive, non-TSSOP designs; verify layout clearance for SOIC footprint. |
Compared with SN74LVC540APWR, SN74LVC240APWR offers identical performance in the same TSSOP-20 package, while 74LVC540AD,212 provides a drop-in SOIC alternative with marginally relaxed timing-making the TI part optimal for space-constrained, high-speed 3.3V bus redriving where thermal pad and fine-pitch assembly are acceptable.
Availability
SN74LVC540APWR is available at Aetrix Electronics and suitable for industrial automation, embedded test equipment, and modular computing systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for SN74LVC540APWR 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 and broad portfolio support for industrial, automotive, and communications markets.
The SN74LVC540APWR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered specifically for low-voltage, high-speed digital interfacing in mixed-signal systems where voltage translation, bus isolation, and 3-state control are essential.
FAQ
What is the maximum clock frequency supported by SN74LVC540APWR?
The SN74LVC540APWR does not operate on a clock; it is an asynchronous buffer. Its 5.3ns maximum propagation delay at 3.3V implies reliable operation with digital signals having rise/fall times faster than ~10ns and periods exceeding ~11ns-supporting data rates up to approximately 90Mbps in NRZ signaling. Actual usable frequency depends on load capacitance and PCB trace characteristics.
Can SN74LVC540APWR safely interface a 5V microcontroller GPIO with a 3.3V FPGA?
Yes. The SN74LVC540APWR accepts input voltages up to 5.5V while operating from a 3.3V VCC, making it ideal for unidirectional 5V-to-3.3V level translation. Its outputs swing rail-to-rail (0V to 3.3V), meeting FPGA input thresholds. Ensure OE1 and OE2 are controlled by the 3.3V domain to avoid floating enables.
Does SN74LVC540APWR require external pull-up resistors on OE1 and OE2?
Not strictly required-but recommended for power-up safety. During power ramp-up, OE1 and OE2 float high, placing outputs in high-Z. To guarantee defined state, tie OE1 and OE2 to VCC via 10kΩ pull-ups. This ensures outputs remain disabled until firmware actively drives them low, preventing bus contention at startup.
How does the Ioff feature of SN74LVC540APWR protect during hot-swap events?
When VCC drops to 0V during hot-swap, the Ioff circuitry disables all outputs regardless of OE1/OE2 state, limiting leakage to ±10μA. This prevents the SN74LVC540APWR from back-driving powered downstream circuits or drawing excessive current from adjacent modules-meeting JESD78 latch-up immunity and enabling compliant hot-plug architectures.
Is SN74LVC540APWR pin-compatible with older 74LS540 devices?
No. SN74LVC540APWR uses a flow-through TSSOP-20 pinout (A1–A8 left side, Y1–Y8 right side), whereas 74LS540 uses a traditional dual-in-line or SOIC layout with interleaved inputs/outputs. Physical replacement requires PCB redesign. Electrical compatibility also differs: LS540 is 5V-only, TTL-input, and lacks Ioff or 5.5V tolerance.
SN74LVC540APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74LVC540APWR FAQ
1.How can I place an order for SN74LVC540APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC540APWR 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 SN74LVC540APWR reliable?
The price and inventory of SN74LVC540APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540APWR is usually 5 days.
3.What payment methods are accepted for SN74LVC540APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC540APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC540APWR?
SN74LVC540APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC540APWR 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 SN74LVC540APWR?
For technical support, including SN74LVC540APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540APWR requirements.
6.How does Aetrix verify that SN74LVC540APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC540APWR 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 SN74LVC540APWR meets industry standards.
7.What is the process for return or replacement of SN74LVC540APWR?
All SN74LVC540APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540APWR, 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 SN74LVC540APWR part is unused and in its original packaging.
Return procedure for SN74LVC540APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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