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Texas Instruments SN74LVC540ADB
- Part No.:
- SN74LVC540ADB
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVC540ADB.pdf
- Description:
- INVERTER 8-INPUT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:27,160
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Product details
Overview
SN74LVC540ADB from onsemi is an inverting octal buffer with 3-state outputs, designed for 1.2 V to 3.6 V operation and featuring 5 V–tolerant inputs/outputs. It delivers ±24 mA output drive, supports live insertion/withdrawal, and operates across −40 °C to +125 °C - ideal for memory address driving and TTL-level bus transceiver applications.
For engineers reviewing the SN74LVC540ADB datasheet, SN74LVC540ADB pinout, SN74LVC540ADB application, or SN74LVC540ADB equivalent, key selection criteria include flow-through pinout architecture, IOFF protection at VCC = 0 V, near-zero static ICC (≤10 µA), 5.5 V VIH tolerance, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC540ADB implements dual independent output-enable control (OE1, OE2) that places all eight outputs into high-impedance when asserted HIGH. Its inverting logic function maps D0–D7 to O0–O7 with complementary polarity, enabling bus isolation and signal inversion in a single device.
It features IOFF circuitry ensuring high-impedance outputs during power-down (VCC = 0 V), critical for hot-swap systems. The 5 V–tolerant I/O allows direct interfacing with legacy 5 V TTL logic without level shifters while maintaining low-voltage core operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.2 V to 3.6 V - enables direct integration into modern low-power 1.8 V/2.5 V/3.3 V systems |
| Input Voltage Tolerance | −0.5 V to 5.5 V - permits safe connection to 5 V drivers without external clamping |
| Output Drive | ±24 mA - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| Propagation Delay | 5.3 ns max at VCC = 3.0–3.6 V - supports >100 MHz bus toggle rates |
| Static Supply Current | ≤10 µA - minimizes quiescent power in battery-backed or always-on subsystems |
| Operating Temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial control environments |
| IOFF Leakage | ±10 µA max at VCC = 0 V - prevents back-powering of powered-down rails during hot insertion |
Pinout & Package
TSSOP-20 (Case 948E) package with 0.65 mm pitch, 4.4 mm width, and 6.5 mm length - optimized for automated assembly and space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-LOW enable inputs - both must be LOW to activate outputs; HIGH disables all outputs to high-Z |
| 2–9 | D0–D7 | Inverting data inputs - each drives corresponding inverted output (e.g., D0 → O0) |
| 11–18 | O0–O7 | 3-state inverting outputs - high-impedance when either OE1 or OE2 is HIGH |
| 10 | GND | Ground reference - decoupling capacitor placement critical for noise immunity |
| 20 | VCC | Power supply - requires local 100 nF ceramic bypass between VCC and GND |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input and output pins arranged on opposite sides (D0–D7 on left, O0–O7 on right) - simplifies PCB routing and reduces crosstalk |
| 5 V–tolerant I/O | VIH up to 5.5 V with VCC as low as 1.2 V - eliminates need for external level translators in mixed-voltage systems |
| IOFF protection | Outputs remain high-impedance even when VCC = 0 V - enables safe hot-plug operation in modular backplanes |
| Low dynamic power | CPD = 14.4 pF at VCC = 3.0–3.6 V - reduces switching power by >40% vs. older LVT logic families |
| ESD robustness | HBM > 2000 V - improves manufacturing yield and field reliability in handling-sensitive environments |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address bus from low-voltage microcontroller to SRAM or Flash memory operating at 3.3 V. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation and fanout amplification while isolating controller from bus capacitance. Use Value: Enables reliable 100+ MHz address strobing with <5.3 ns propagation delay and 24 mA drive per line - eliminating timing margin loss from trace loading. | Use Scenario: Isolating PLC CPU module from field I/O expansion racks using shared TTL-compatible control bus. IC Role / Device Role / Timing Role: Bidirectional bus driver with 3-state control, allowing master/slave arbitration and fault containment. Use Value: Dual OE inputs permit independent enable/disable of two 4-bit segments - supporting flexible bus partitioning and hot-swap diagnostics without system reset. |
| Hot-Swappable Module Interface | Low-Power Sensor Hub Aggregation |
Use Scenario: Backplane interface for removable compute modules where power sequencing is uncontrolled during insertion. IC Role / Device Role / Timing Role: Signal conditioner enforcing high-Z state during VCC ramp-up/down via IOFF circuitry. Use Value: Prevents back-driving of powered rails and latch-up risk - validated to withstand 250 mA latch-up current per JEDEC JESD78. | Use Scenario: Aggregating 8 analog sensor outputs (via ADCs) into a low-power MCU with 1.8 V I/O domain. IC Role / Device Role / Timing Role: Voltage-tolerant buffer isolating 3.3 V sensor interface from 1.8 V processor bus. Use Value: Operates at 1.8 V VCC while accepting 3.3 V inputs - reducing system BOM by removing discrete level shifters and saving >150 µW per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APW | TSSOP-20, identical electrical specs but non-flow-through pinout (inputs/outputs interleaved) | Requires longer PCB traces and increased crosstalk risk due to input/output adjacency | Prefer SN74LVC540ADB when layout density and signal integrity are prioritized |
| 74LVC541ADB | Non-inverting octal buffer with same pinout, VCC range, and drive strength | Used where signal polarity preservation is required (e.g., address mirroring, not inversion) | Select SN74LVC540ADB only when inverting logic is explicitly needed in the signal path |
Compared with SN74LVC240APW and 74LVC541ADB, the SN74LVC540ADB uniquely combines flow-through pinout, inverting logic, and 5 V tolerance - making it optimal for high-speed, space-constrained bus buffering where polarity inversion is acceptable or required.
Availability
SN74LVC540ADB is available at Aetrix Electronics and suitable for memory address driving, industrial bus transceivers, hot-swappable module interfaces, and low-power sensor hub aggregation requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVC540ADB 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The SN74LVC540ADB belongs to the LVC logic family - engineered for low-voltage operation with 5 V tolerance, targeting high-speed, low-power digital interface applications in mixed-voltage systems.
FAQ
What is the maximum supply voltage for SN74LVC540ADB?
The absolute maximum DC supply voltage for SN74LVC540ADB is +6.5 V, but recommended operation is limited to 1.2 V to 3.6 V. Exceeding 3.6 V may cause parametric degradation or reliability issues. The device's 5 V–tolerant inputs allow interfacing with 5 V signals even when VCC is as low as 1.2 V - a key feature of the SN74LVC540ADB design.
Does SN74LVC540ADB support hot-swap functionality?
Yes, SN74LVC540ADB supports live insertion and withdrawal per its datasheet. The IOFF specification guarantees high-impedance outputs when VCC = 0 V, preventing back-current flow into unpowered sections. This behavior is verified across temperature and ensures safe operation during hot-plug events - a core capability built into the SN74LVC540ADB architecture.
What is the propagation delay of SN74LVC540ADB at 3.3 V?
At VCC = 3.0 V to 3.6 V, the maximum propagation delay (tpd) of SN74LVC540ADB is 5.3 ns, measured from input transition to output transition. Typical delay is lower (≈1.0 ns), and this value applies across the full −40 °C to +125 °C operating range. This performance is guaranteed for the SN74LVC540ADB in TSSOP-20 packaging.
How many output-enable inputs does SN74LVC540ADB have?
SN74LVC540ADB has two independent output-enable inputs: OE1 (pin 1) and OE2 (pin 19). Both are active-LOW - outputs are enabled only when both OE1 and OE2 are LOW. If either is HIGH, all eight outputs enter high-impedance state. This dual-control architecture is integral to the SN74LVC540ADB's bus arbitration capability.
Is SN74LVC540ADB RoHS compliant and lead-free?
Yes, SN74LVC540ADB is Pb-free, halogen-free/BFR-free, and fully RoHS compliant per EU Directive 2011/65/EU. The "G" suffix in ordering codes (e.g., SN74LVC540ADBR2G) explicitly denotes lead-free packaging. This compliance is documented in the official onsemi datasheet for SN74LVC540ADB and verified through material declarations.
SN74LVC540ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVC540ADB FAQ
1.How can I place an order for SN74LVC540ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC540ADB 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 SN74LVC540ADB reliable?
The price and inventory of SN74LVC540ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540ADB is usually 5 days.
3.What payment methods are accepted for SN74LVC540ADB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC540ADB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC540ADB?
SN74LVC540ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC540ADB 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 SN74LVC540ADB?
For technical support, including SN74LVC540ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540ADB requirements.
6.How does Aetrix verify that SN74LVC540ADB is sourced from the original manufacturer or authorized distributors?
All SN74LVC540ADB 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 SN74LVC540ADB meets industry standards.
7.What is the process for return or replacement of SN74LVC540ADB?
All SN74LVC540ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540ADB, 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 SN74LVC540ADB part is unused and in its original packaging.
Return procedure for SN74LVC540ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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