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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74LV540ANS

Name: SN74LV540ANS
Brand: Texas Instruments
SKU: SN74LV540ANS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LV540ANS

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74LV540ANS.pdf

Description:: IC BUFFER INVERT 5.5V 20SO

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Product details

Overview

SN74LV540ANS from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for 2-V to 5.5-V V_CC operation. It provides inverted data transmission across eight channels, supports mixed-mode voltage interfacing on all ports, and features dual active-low output-enable inputs (OE1̅, OE2̅) controlling high-impedance states. It is commonly used to drive bus lines or buffer memory address registers in industrial control and embedded systems.

For engineers reviewing the SN74LV540ANS datasheet, SN74LV540ANS pinout, SN74LV540ANS application, or SN74LV540ANS equivalent, key selection considerations include its 20-pin SOIC (NS) package, LVTTL-compatible I/O levels, 8.5 ns max propagation delay at 3.3 V, ±8 mA output drive capability, and support for power-up/down high-impedance safety via pull-up on OE̅.

Technical Context

The SN74LV540ANS implements an inverting octal buffer architecture with dual active-low 3-state enable logic (AND-gated OE1̅ and OE2̅), ensuring all eight Y outputs enter high-impedance when either enable is high. Its EPIC™ CMOS process delivers robust noise immunity, including <0.8 V ground bounce (VOLP) and >2.3 V VOH undershoot (VOHV) at 3.3 V/25°C.

It operates across –40°C to 85°C and supports mixed-voltage signaling: inputs accept 0–5.5 V, outputs swing rail-to-rail (0 to V_CC) in active state, and tolerate up to 5.5 V in 3-state - enabling interoperability between 2.5 V, 3.3 V, and 5 V domains without level shifters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.0 V to 5.5 V - enables single-supply operation across legacy 5 V and modern low-voltage systems.
Output Drive	±8 mA at 3 V - sufficient to drive standard LVTTL loads and moderate-capacitance buses without external buffering.
Max Propagation Delay	8.5 ns at V_CC = 3.3 V, CL = 15 pF - ensures timing compliance in 100+ MHz address/data bus applications.
Input/Output Voltage Tolerance	Inputs: 0–5.5 V; Outputs (3-state): 0–5.5 V - allows safe interfacing with higher-voltage logic during power sequencing or fault conditions.
Static Supply Current	20 µA max at 5.5 V - minimizes quiescent power in always-on subsystems such as system management controllers.
ESD Protection	>2000 V HBM, >200 V MM - meets industrial IEC 61000-4-2 surge immunity requirements without external protection.
Latch-Up Immunity	>250 mA per JESD 17 - prevents destructive latch-up during transient overvoltage events on I/O pins.

Pinout & Package

SN74LV540ANS is supplied in a 20-pin plastic small-outline (SOIC-20, NS package) with standard JEDEC MO-015AC dimensions (7.5 mm × 12.8 mm, 1.27 mm pitch). Pin numbering follows standard SOIC top-view convention with index mark at Pin 1.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1̅, OE2̅	Active-low dual output-enable inputs - both must be low for outputs to be active; either high forces all Y outputs into high-Z.
2–9	A1–A8	Inverting input channels - each drives corresponding inverted output Y1–Y8 when enabled.
11, 20	GND, V_CC	Power supply terminals - decoupling capacitor (0.1 µF) required near Pin 20 for stable switching performance.
12–18	Y1–Y8	Inverted 3-state outputs - provide complementary logic to A1–A8 only when OE1̅ and OE2̅ are both low.

Key Features

Feature	Design Value
Inverting 3-state buffer architecture	Enables bidirectional bus control using OE1̅/OE2̅ AND logic - simplifies direction arbitration in shared-memory systems.
Mixed-mode voltage interface	Accepts 0–5.5 V inputs and tolerates 0–5.5 V on 3-state outputs - eliminates need for external level translators in multi-rail designs.
Low ground bounce (VOLP)	<0.8 V at 3.3 V/25°C - reduces signal integrity risk in dense PCB layouts with simultaneous switching outputs.
Enhanced ESD/latch-up robustness	>2000 V HBM ESD and >250 mA latch-up immunity - improves field reliability in industrial environments with frequent handling or electrostatic exposure.
Power-up/down high-Z guarantee	OE̅ pull-up resistor ensures defined high-impedance state during supply ramp - prevents bus contention at system startup or reset.

Applications

Memory Address Buffering	Industrial Bus Isolation
Use Scenario: Buffering microcontroller-generated address signals to multiple SRAM or flash devices sharing a common data/address bus. IC Role / Device Role / Timing Role: Inverting octal buffer providing isolation and fan-out amplification while maintaining timing integrity via sub-9 ns propagation delay. Use Value: Prevents address line loading-induced skew and ensures clean transitions across 8-bit address segments under mixed-voltage conditions (e.g., 3.3 V MCU driving 5 V memory).	Use Scenario: Isolating PLC I/O module backplane signals from processor-side logic to prevent noise coupling and fault propagation. IC Role / Device Role / Timing Role: 3-state driver enabling controlled bus access by asserting OE̅ only during valid read/write cycles. Use Value: Eliminates bus contention during hot-swap or partial reconfiguration; high-Z state withstands ±5.5 V transients per JESD 17.
Legacy System Voltage Translation	Embedded Controller Peripheral Interface
Use Scenario: Interfacing a 2.5 V FPGA I/O bank to a 5 V peripheral ASIC requiring inverted control signals (e.g., chip select, write enable). IC Role / Device Role / Timing Role: Level-tolerant inverting buffer translating logic levels without external biasing or resistive dividers. Use Value: Reduces BOM count and layout area versus discrete translation solutions; maintains setup/hold margins due to predictable 8.5 ns t_pd.	Use Scenario: Driving eight parallel GPIO lines from an ARM Cortex-M microcontroller to external sensors or actuators with configurable enable control. IC Role / Device Role / Timing Role: Octal inverting driver with dual OE̅ inputs allowing synchronized activation of two independent signal groups. Use Value: Enables software-controlled group isolation (e.g., disable sensor array while activating actuator bank) without additional logic gates.

Memory Address Buffering

Industrial Bus Isolation

Use Scenario: Buffering microcontroller-generated address signals to multiple SRAM or flash devices sharing a common data/address bus.

IC Role / Device Role / Timing Role: Inverting octal buffer providing isolation and fan-out amplification while maintaining timing integrity via sub-9 ns propagation delay.

Use Value: Prevents address line loading-induced skew and ensures clean transitions across 8-bit address segments under mixed-voltage conditions (e.g., 3.3 V MCU driving 5 V memory).

Use Scenario: Isolating PLC I/O module backplane signals from processor-side logic to prevent noise coupling and fault propagation.

IC Role / Device Role / Timing Role: 3-state driver enabling controlled bus access by asserting OE̅ only during valid read/write cycles.

Use Value: Eliminates bus contention during hot-swap or partial reconfiguration; high-Z state withstands ±5.5 V transients per JESD 17.

Legacy System Voltage Translation

Embedded Controller Peripheral Interface

Use Scenario: Interfacing a 2.5 V FPGA I/O bank to a 5 V peripheral ASIC requiring inverted control signals (e.g., chip select, write enable).

IC Role / Device Role / Timing Role: Level-tolerant inverting buffer translating logic levels without external biasing or resistive dividers.

Use Value: Reduces BOM count and layout area versus discrete translation solutions; maintains setup/hold margins due to predictable 8.5 ns t_pd.

Use Scenario: Driving eight parallel GPIO lines from an ARM Cortex-M microcontroller to external sensors or actuators with configurable enable control.

IC Role / Device Role / Timing Role: Octal inverting driver with dual OE̅ inputs allowing synchronized activation of two independent signal groups.

Use Value: Enables software-controlled group isolation (e.g., disable sensor array while activating actuator bank) without additional logic gates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LV240ANS	Same 20-pin SOIC package, identical V_CC range and 3-state logic, but non-inverting outputs.	Requires upstream inversion or logic adjustment if system expects inverted data path.	Select when signal polarity must remain unchanged; otherwise SN74LV540ANS provides direct functional match.
74LVC240PW	8-bit non-inverting 3-state buffer in TSSOP-20; V_CC = 1.65–3.6 V only; lower drive (±24 mA) but faster t_pd (5.1 ns @ 3.3 V).	Not suitable for 5 V systems or applications requiring 5.5 V tolerance; lacks mixed-mode voltage margin.	Prefer for compact, high-speed 3.3 V-only designs; SN74LV540ANS remains optimal for 2–5.5 V flexibility and industrial ruggedness.

Compared with SN74LV240ANS and 74LVC240PW, the SN74LV540ANS uniquely combines inverting logic, full 2–5.5 V operation, and 5.5 V-tolerant 3-state I/O - making it the only choice for mixed-voltage bus buffering where polarity inversion and wide supply range are mandatory.

Availability

SN74LV540ANS is available at Aetrix Electronics and suitable for industrial automation, embedded controller peripherals, memory subsystem buffering, and legacy system voltage translation requiring stable component supply and long-term lifecycle support.

Supply support for SN74LV540ANS 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 innovation in industrial-grade interface and power management ICs.

The SN74LV540ANS belongs to TI's LV family of low-voltage logic devices, engineered for robust mixed-signal interoperability, ESD resilience, and seamless integration into cost-sensitive, high-reliability industrial and automotive-adjacent systems.

FAQ

What is the maximum operating temperature range for the SN74LV540ANS?

The SN74LV540ANS is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade rating ensures reliable performance in factory automation, motor control, and outdoor embedded equipment where thermal cycling and extended temperature exposure occur. The device's EPIC™ CMOS process contributes to stable parametric behavior across this full range.

Does the SN74LV540ANS require external pull-up resistors on its OE̅ pins?

Yes - to guarantee high-impedance state during power-up or power-down, OE1̅ and OE2̅ must be tied to V_CC via pull-up resistors. The minimum resistance value depends on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. This design practice prevents bus contention before firmware initializes the enable control, and is explicitly recommended in the SN74LV540ANS datasheet.

Can the SN74LV540ANS safely interface between a 3.3 V microcontroller and a 5 V peripheral?

Yes - the SN74LV540ANS supports mixed-mode voltage operation: its inputs accept 0–5.5 V regardless of V_CC, and its 3-state outputs tolerate 0–5.5 V. When powered at 3.3 V, it can reliably receive 5 V logic-high signals from a peripheral and drive 5 V-tolerant inputs without damage or level-shifting circuitry, making it ideal for bridging voltage domains in upgrade paths.

What is the output drive strength of the SN74LV540ANS at 3.3 V supply?

At V_CC = 3.3 V, the SN74LV540ANS delivers ±8 mA output drive (I_OH = –8 mA, I_OL = 8 mA) into standard LVTTL loads. This matches typical bus-load requirements for driving multiple TTL or CMOS inputs, and supports trace capacitances up to ~50 pF while maintaining sub-10 ns propagation delay - verified in the official SCLS409C datasheet switching characteristics tables.

Is the SN74LV540ANS pin-compatible with other octal buffers in the same package?

No - while the SN74LV540ANS uses the standard 20-pin SOIC (NS) footprint, its pinout is specific to the LV540A function: inputs (A1–A8) occupy Pins 2–9, outputs (Y1–Y8) occupy Pins 12–18, and dual OE̅ inputs are on Pins 1 and 19. Devices like SN74LV240ANS share the same package but differ in signal assignment and logic polarity; direct replacement requires schematic and layout verification.

SN74LV540ANS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LV

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Bulk

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-SO

SN74LV540ANS FAQ

1.How can I place an order for SN74LV540ANS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LV540ANS 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 SN74LV540ANS reliable?

The price and inventory of SN74LV540ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV540ANS is usually 5 days.

3.What payment methods are accepted for SN74LV540ANS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV540ANS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LV540ANS?

SN74LV540ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LV540ANS 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 SN74LV540ANS?

For technical support, including SN74LV540ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV540ANS requirements.

6.How does Aetrix verify that SN74LV540ANS is sourced from the original manufacturer or authorized distributors?

All SN74LV540ANS 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 SN74LV540ANS meets industry standards.

7.What is the process for return or replacement of SN74LV540ANS?

All SN74LV540ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV540ANS, 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 SN74LV540ANS part is unused and in its original packaging.

Return procedure for SN74LV540ANS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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