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Texas Instruments SN74LV540ADWR
- Part No.:
- SN74LV540ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LV540ADWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,600
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Product details
Overview
SN74LV540ADWR from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in 2 V to 5.5 V systems. It features dual active-low output enables (OE1/OE2), supports mixed-mode voltage operation, provides Ioff partial-power-down protection, and delivers ≤8.5 ns propagation delay at 5 V - enabling reliable signal isolation in industrial and automotive data interfaces.
For engineers reviewing the SN74LV540ADWR datasheet, SN74LV540ADWR pinout, SN74LV540ADWR application, or SN74LV540ADWR equivalent, key selection considerations include its SOIC-20 package, 3-state control architecture with inverted outputs, guaranteed 125°C operation, ±35 mA output drive capability, and compatibility with 3.3 V/5 V mixed-voltage bus environments.
Technical Context
The SN74LV540ADWR implements eight independent inverting buffers, each controlled by a two-input AND gate with active-low OE1 and OE2 inputs: either enable high forces all eight outputs into high-impedance state. Its CMOS design ensures rail-to-rail output swing (VOL ≤ 0.55 V at 4.5 V, VOH ≥ 3.8 V) and input overvoltage tolerance up to 5.5 V regardless of VCC setting.
Thermal performance is characterized by RθJA = 79.8°C/W in the SOIC-20 (DW) package, with latch-up immunity exceeding 250 mA per JESD17. The device operates across –40°C to +125°C and meets ±2000 V HBM ESD rating, supporting robust deployment in harsh industrial and automotive infotainment signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables direct interface with 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| tpd (Max) | 8.5 ns at VCC = 5 V, CL = 15 pF - ensures timing-critical bus buffering with predictable delay margins |
| IOL / IOH | ±16 mA at VCC = 4.5 V - sufficient to drive standard TTL loads and moderate-capacitance PCB traces |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial temperature-critical applications |
| Ioff Support | Active at VCC = 0 V - prevents back-driving and current leakage during power sequencing or partial shutdown |
| ESD Rating | ±2000 V HBM - meets industrial handling and board-level ESD immunity requirements |
| Input Voltage Range | –0.5 V to 5.5 V - allows safe interfacing with higher-voltage controllers even when VCC = 2.5 V |
Pinout & Package
SN74LV540ADWR is packaged in a 20-pin SOIC (DW) with 12.80 mm × 7.50 mm body size, 1.27 mm lead pitch, and gull-wing leads compatible with standard reflow profiles (MSL Level-1, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - either high disables all eight outputs into high-Z state |
| 2–9 | A1–A8 | Inverting input terminals - drive corresponding Y outputs with logical inversion |
| 10 | GND | Ground reference for all internal circuitry and output return path |
| 11–18 | Y8–Y1 | Inverting buffered outputs - provide complementary logic states relative to A inputs |
| 20 | VCC | Primary power supply - powers all internal logic and output drivers; bypassing with 0.1 µF capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage support | Inputs tolerate up to 5.5 V while VCC operates as low as 2 V - enables seamless down-translation from 5 V controllers to 3.3 V subsystems |
| Output ground bounce (VOLP) | < 0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes during switching |
| Output VOH undershoot (VOHV) | > 2.3 V at VCC = 3.3 V - maintains clean high-level signaling integrity under transient load conditions |
| Slow edge rate control | Δt/Δv = 20 ns/V at 5 V - reduces output ringing and EMI in high-speed bus environments |
| Latch-up immunity | > 250 mA per JESD17 - ensures survivability against accidental current surges in industrial deployments |
Applications
| Industrial Bus Isolation | Automotive Infotainment Interface |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from noisy CAN/LIN transceiver control lines in factory automation PLCs. IC Role / Device Role / Timing Role: Octal inverting buffer with 3-state control acts as bidirectional signal conditioner and bus contention guard. Use Value: Prevents back-driving during power sequencing and eliminates ground bounce-induced communication errors in multi-node RS-485 networks. | Use Scenario: Driving display controller address lines in head-unit systems where main SoC runs at 3.3 V but legacy peripherals require 5 V-compatible logic levels. IC Role / Device Role / Timing Role: Voltage-tolerant octal buffer translates and isolates address/data bus signals between heterogeneous voltage domains. Use Value: Enables drop-in replacement of obsolete 74LS540 without redesigning power rails or adding discrete level shifters. |
| Patient Monitoring Signal Routing | Network Switch Control Plane |
Use Scenario: Buffering sensor multiplexer select lines in medical-grade ECG monitors where signal integrity and low EMI are critical. IC Role / Device Role / Timing Role: Low-noise inverting driver with controlled edge rates routes timing-critical analog front-end configuration signals. Use Value: Reduces switching-induced artifacts in sensitive biopotential measurements by limiting dV/dt and suppressing output overshoot. | Use Scenario: Managing LED status indicators and reset signal distribution across multiple ASICs in enterprise Ethernet switches. IC Role / Device Role / Timing Role: High-reliability 3-state buffer isolates control plane logic from hot-swap events and firmware updates. Use Value: Ioff functionality prevents leakage currents during partial power-down, maintaining system stability during firmware upgrades or module insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC540APW | Lower VCC range (1.65–3.6 V); faster tpd (5.2 ns @ 3.3 V); no 5 V tolerance on inputs | Restricted to 3.3 V-only systems; unsuitable for mixed 5 V/3.3 V interfaces | Select only if full 5 V input tolerance is unnecessary and lower propagation delay is prioritized |
| 74ACT540SC | Higher drive (±24 mA @ 5 V); 5 V-only operation; no Ioff or mixed-voltage support | Requires dedicated 5 V rail; lacks partial-power-down capability for modern low-power designs | Prefer for legacy 5 V-only boards where TI's LV family compatibility is not required |
Compared with SN74LVC540APW and 74ACT540SC, the SN74LV540ADWR uniquely balances wide voltage operation (2–5.5 V), 5.5 V input tolerance, Ioff protection, and industrial temperature range - making it the only option qualified for mixed-domain automotive and industrial control applications requiring robust power sequencing.
Availability
SN74LV540ADWR is available at Aetrix Electronics and suitable for industrial bus isolation, automotive infotainment interface, patient monitoring signal routing, and network switch control plane applications requiring stable component supply and long-term lifecycle support.
Supply support for SN74LV540ADWR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74LV540ADWR belongs to TI's LV logic family, engineered for low-voltage operation with mixed-signal compatibility and robustness in electrically noisy, thermally demanding environments.
FAQ
What is the maximum operating temperature for SN74LV540ADWR?
The SN74LV540ADWR is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated per TI's recommended operating conditions and thermal metrics (RθJA = 79.8°C/W for SOIC-20), confirming suitability for under-hood automotive and industrial control applications where thermal stress is significant. The SN74LV540ADWR maintains full electrical performance across this range without derating.
Does SN74LV540ADWR support 5 V input signals when powered at 3.3 V?
Yes, the SN74LV540ADWR supports input voltages up to 5.5 V regardless of VCC level - a feature explicitly documented in Section 6.3 (Recommended Operating Conditions) and Section 8.3 (Feature Description). When VCC = 3.3 V, the SN74LV540ADWR safely accepts 5 V logic inputs without damage or clamping, enabling reliable down-translation in mixed-voltage systems without external level shifters.
How does the dual output enable (OE1/OE2) logic work on SN74LV540ADWR?
The SN74LV540ADWR uses a two-input AND gate structure for 3-state control: both OE1 and OE2 must be low to enable outputs; if either is high, all eight Y outputs enter high-impedance state. This architecture is confirmed in the functional block diagram (Section 8.2) and function table (Table 8-1). The SN74LV540ADWR thus supports flexible bus arbitration - for example, OE1 can serve as global enable while OE2 connects to a local peripheral select signal.
What is the output drive strength of SN74LV540ADWR at 3.3 V supply?
At VCC = 3.3 V, the SN74LV540ADWR delivers ±8 mA output current (IOL/IOH) while maintaining VOL ≤ 0.44 V and VOH ≥ 2.48 V, as specified in Table 6.5 Electrical Characteristics. This drive level is sufficient for standard 50 Ω transmission lines and typical CMOS/TTL fan-out requirements. The SN74LV540ADWR's controlled edge rates further ensure signal integrity without excessive ringing at this drive strength.
Is SN74LV540ADWR pin-compatible with older 74LS540 devices?
No, the SN74LV540ADWR is not pin-compatible with 74LS540. While both are octal inverting buffers in 20-pin packages, the SN74LV540ADWR uses SOIC-20 (DW) with different pin assignments: OE1 is on Pin 1 and OE2 on Pin 19, whereas 74LS540 places the single OE on Pin 13. Additionally, the SN74LV540ADWR has inverted outputs (A→Y inversion), unlike the non-inverting 74LS540. Direct replacement requires PCB layout revision and logic polarity verification.
SN74LV540ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LV540ADWR FAQ
1.How can I place an order for SN74LV540ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV540ADWR 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 SN74LV540ADWR reliable?
The price and inventory of SN74LV540ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV540ADWR is usually 5 days.
3.What payment methods are accepted for SN74LV540ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV540ADWR transactions.
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4.How is shipping managed for SN74LV540ADWR?
SN74LV540ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV540ADWR 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 SN74LV540ADWR?
For technical support, including SN74LV540ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV540ADWR requirements.
6.How does Aetrix verify that SN74LV540ADWR is sourced from the original manufacturer or authorized distributors?
All SN74LV540ADWR 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 SN74LV540ADWR meets industry standards.
7.What is the process for return or replacement of SN74LV540ADWR?
All SN74LV540ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV540ADWR, 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 SN74LV540ADWR part is unused and in its original packaging.
Return procedure for SN74LV540ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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