My Inquiry
My Account
Texas Instruments SN74LVC540ANS
- Part No.:
- SN74LVC540ANS
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVC540ANS.pdf
- Description:
- IC BUFF/DVR 3ST OCTAL 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:9,800
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC540ANS from ON Semiconductor 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 is used in memory address driving and TTL-level bus transceiver applications.
For engineers reviewing the SN74LVC540ANS datasheet, SN74LVC540ANS pinout, SN74LVC540ANS application, or SN74LVC540ANS equivalent, key selection criteria include flow-through pinout architecture, IOFF protection at VCC = 0 V, low ICC (≤40 µA), 5.5 V input voltage rating, and SOIC-20 WB package compatibility.
Technical Context
The SN74LVC540ANS implements dual independent output-enable control (OE1, OE2) that places all eight outputs into high-impedance state when asserted HIGH. Its flow-through pinout-inputs on one side (D0–D7, OE1, OE2), outputs on the opposite (O0–O7, VCC, GND)-minimizes PCB trace crossovers in dense bus layouts.
It uses advanced LVC CMOS process technology enabling rail-to-rail 5 V–tolerant I/O while operating from 1.2 V supply, with guaranteed latchup immunity >250 mA and ESD robustness (>2000 V HBM). The device maintains near-zero static supply current across all logic states (10 µA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.2 V to 3.6 V - Enables direct interface with modern low-voltage microcontrollers and FPGAs without level shifters. |
| Input Voltage Tolerance | −0.5 V to +5.5 V - Allows safe connection to legacy 5 V TTL logic without external clamping or translation. |
| Output Drive | ±24 mA - Sufficient to drive 15–20 TTL loads or terminate short stubs on parallel buses. |
| Propagation Delay | 5.3 ns max at VCC = 3.0–3.6 V - Supports bus speeds up to ~100 MHz in non-critical timing paths. |
| IOFF Current | ±10 µA max at VCC = 0 V - Ensures true high-impedance isolation during hot-swap or power sequencing. |
| Static ICC | ≤40 µA at VCC = 3.6 V - Reduces system standby power in battery-backed or always-on subsystems. |
| Operating Temperature | −40 °C to +125 °C - Qualified for industrial and extended-temperature embedded control environments. |
Pinout & Package
SN74LVC540ANS is supplied in a 20-pin SOIC wide-body (SOIC-20 WB, Case 751D) package with 0.300-inch body width and 1.27 mm pitch. Pin 1 is marked by a beveled corner or notch; pin numbering follows standard counter-clockwise orientation.
| 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 = NOT D0). |
| 10 | GND | Ground reference - Single ground pin shared by all internal circuitry and I/O structures. |
| 11–18 | O0–O7 | Inverting 3-state outputs - Output state mirrors inverted input only when OE1/OE2 are LOW. |
| 20 | VCC | Power supply - Supplies core logic and I/O buffers; decoupling capacitor required per JEDEC guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs (D0–D7, OE1, OE2) on left side; outputs (O0–O7, VCC, GND) on right - simplifies PCB routing and reduces layer count in bus interfaces. |
| 5 V–tolerant I/O | VI and VO rated to 5.5 V - eliminates need for external voltage translators when interfacing with 5 V peripherals or legacy systems. |
| IOFF protection | Guaranteed high-impedance I/O when VCC = 0 V - prevents back-driving of powered subsystems during hot-plug or partial power-down. |
| Low dynamic power | CPD = 14.4 pF at VCC = 3.0–3.6 V - enables predictable dynamic power calculation (PD = CPD × VCC² × fi × N) for thermal design. |
| TTL-compatible thresholds | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 3.0–3.6 V - ensures reliable switching with standard TTL and LVTTL signal sources. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 8-bit or 16-bit address lines from a microcontroller to SRAM or Flash memory with long trace runs. IC Role / Device Role / Timing Role: Inverting octal buffer providing fanout, noise margin enhancement, and 5 V–tolerant interface between low-voltage MCU and memory ICs. Use Value: Eliminates need for discrete level-shifting components while maintaining <5.3 ns propagation delay for synchronous memory access timing. | Use Scenario: Isolating and buffering control signals (e.g., chip select, write enable) across isolated zones in PLC backplanes or motor drive modules. IC Role / Device Role / Timing Role: 3-state bus buffer enabling bidirectional signal direction control via OE1/OE2, supporting hot-swap and modular I/O expansion. Use Value: IOFF protection prevents signal corruption during module insertion/removal; ±24 mA drive sustains signal integrity over 10 cm PCB traces. |
| Legacy System Interface | Low-Power Peripheral Expansion |
Use Scenario: Interfacing a 3.3 V FPGA I/O bank to existing 5 V TTL logic in test equipment or instrumentation racks. IC Role / Device Role / Timing Role: Level-tolerant inverting buffer translating logic levels without external resistors or active translators. Use Value: 5.5 V input rating allows direct connection to 5 V outputs; flow-through pinout minimizes layout complexity in retrofit designs. | Use Scenario: Expanding GPIO count on battery-powered IoT edge nodes using ultra-low-power microcontrollers. IC Role / Device Role / Timing Role: Low-quiescent-current octal buffer enabling selective peripheral activation while minimizing sleep-mode leakage. Use Value: ≤40 µA ICC at VCC = 3.6 V and near-zero static current in all states reduce average system power by >10 µA per enabled 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 |
|---|---|---|---|
| SN74LVC240ANS | Same pinout, identical electrical specs, but dual OE inputs tied internally - single OE control instead of independent OE1/OE2. | Less flexible for split-bus enable control; suitable where unified enable suffices. | Select SN74LVC240ANS if simplified enable logic is acceptable and board layout re-use is prioritized. |
| 74LCX240M | Functionally identical but manufactured by ON Semiconductor's predecessor (Fairchild); same SOIC-20 WB package and flow-through pinout. | No functional difference; obsolescence risk higher due to discontinued status per Fairchild lifecycle notice. | Prefer SN74LVC540ANS for new designs requiring full manufacturer support and RoHS-compliant sourcing. |
Compared with SN74LVC240ANS and 74LCX240M, the SN74LVC540ANS provides independent dual-OE control for granular bus partitioning, full lifecycle support from ON Semiconductor, and documented IOFF compliance - making it optimal for industrial hot-swap and modular system designs.
Availability
SN74LVC540ANS is available at Aetrix Electronics and suitable for memory address driving, industrial bus transceivers, and legacy TTL interface applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for SN74LVC540ANS 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The SN74LVC540ANS belongs to the LVC logic family, engineered for low-voltage operation with 5 V–tolerant I/O to bridge legacy and next-generation digital systems in space-constrained, thermally sensitive embedded platforms.
FAQ
What is the maximum supply voltage for SN74LVC540ANS?
The absolute maximum DC supply voltage (VCC) for SN74LVC540ANS 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 logic even when VCC is as low as 1.2 V - a key feature confirmed in the datasheet's Recommended Operating Conditions table.
Does SN74LVC540ANS support hot-swap capability?
Yes, SN74LVC540ANS supports live insertion and withdrawal per its datasheet features list. This is enabled by the IOFF specification, which guarantees high-impedance I/O states when VCC = 0 V - preventing back-current flow into unpowered sections of a backplane or card cage. This behavior is verified under the Maximum Ratings and DC Electrical Characteristics sections of the official ON Semiconductor datasheet for SN74LVC540ANS.
What is the pin configuration for SN74LVC540ANS?
SN74LVC540ANS uses a 20-pin SOIC-20 WB (Case 751D) package with flow-through pinout: pins 1–9 are OE1, D0–D7, OE2; pins 11–18 are O0–O7; pin 10 is GND; pin 20 is VCC. This arrangement separates inputs and outputs spatially to simplify PCB routing. The pinout is explicitly shown in Figure 1 of the ON Semiconductor datasheet and matches the ordering information for part number SN74LVC540ANS.
Can SN74LVC540ANS drive standard TTL loads?
Yes, SN74LVC540ANS can directly drive standard TTL loads. Its outputs deliver ±24 mA at VCC ≥ 2.7 V, exceeding the ±1.6 mA requirement of one standard TTL unit load. Additionally, its output voltage thresholds (VOH ≥ VCC − 0.2 V, VOL ≤ 0.4 V) and input compatibility (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 3.3 V) meet or exceed TTL specifications - confirmed in the DC Electrical Characteristics tables of the SN74LVC540ANS datasheet.
Is SN74LVC540ANS RoHS compliant and lead-free?
Yes, SN74LVC540ANS is RoHS compliant and lead-free. The datasheet states "These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant", and the ordering suffix "G" (as in SN74LVC540ADWR2G) explicitly denotes Pb-free packaging. This applies to both SOIC-20 WB and TSSOP-20 variants, and the compliance is verified per EU Directive 2011/65/EU and ON Semiconductor's material declarations for SN74LVC540ANS.
SN74LVC540ANS 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:
- -
SN74LVC540ANS FAQ
1.How can I place an order for SN74LVC540ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC540ANS 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 SN74LVC540ANS reliable?
The price and inventory of SN74LVC540ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC540ANS is usually 5 days.
3.What payment methods are accepted for SN74LVC540ANS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC540ANS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC540ANS?
SN74LVC540ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC540ANS 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 SN74LVC540ANS?
For technical support, including SN74LVC540ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC540ANS requirements.
6.How does Aetrix verify that SN74LVC540ANS is sourced from the original manufacturer or authorized distributors?
All SN74LVC540ANS 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 SN74LVC540ANS meets industry standards.
7.What is the process for return or replacement of SN74LVC540ANS?
All SN74LVC540ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC540ANS, 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 SN74LVC540ANS part is unused and in its original packaging.
Return procedure for SN74LVC540ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC540ANS Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
