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Texas Instruments SN74LVTH540DWR
- Part No.:
- SN74LVTH540DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH540DWR.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,097
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Product details
Overview
SN74LVTH540DWR from Texas Instruments is an octal buffer/driver IC designed for 3.3-V VCC operation with mixed-mode 5-V input/output compatibility, 8-channel noninverting output configuration, ±64 mA output drive capability at VCC = 3 V, and bus-hold inputs eliminating external resistors - used in memory address buffering and 3.3-V/5-V bus interfacing applications.
For engineers reviewing the SN74LVTH540DWR datasheet, SN74LVTH540DWR pinout, SN74LVTH540DWR application, or SN74LVTH540DWR equivalent, key selection considerations include its dual active-low 3-state enable architecture, Ioff-enabled hot-insertion support, 2.7–3.6 V supply range, and SOIC-20 package thermal performance (θJA = 58°C/W).
Technical Context
The SN74LVTH540DWR implements a dual-gated 3-state control structure where OE1 and OE2 feed a 2-input AND gate with active-low logic: either enable high forces all eight Y outputs into high-impedance. Its bus-hold circuitry maintains valid logic states on undriven A inputs without external biasing, with ±500 µA dynamic hold current at VCC = 3.6 V.
It supports hot insertion via Ioff protection that disables outputs during power-down to prevent backflow current, and power-up 3-state behavior ensures high-impedance outputs when VCC is below 1.5 V - critical for live backplane or modular system upgrades.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - enables stable operation from unregulated batteries or noisy DC-DC outputs without LDO regulation. |
| IOL/IOH | 64 mA / −32 mA at VCC = 3 V - drives heavy capacitive loads (e.g., 50-pF bus lines) with <4.6 ns propagation delay. |
| Input Voltage Range | −0.5 V to 5.5 V - accepts TTL-level (5-V) signals directly while powered from 3.3-V rail, enabling seamless level translation. |
| Bus-Hold Current | ±500 µA at VCC = 3.6 V - actively sustains logic state on floating data inputs, removing need for 10-kΩ pullup/pulldown networks. |
| tPZL/tPLZ | ≤5.9 ns at VCC = 3.3 V - ensures fast, deterministic output disable/enable timing for synchronous bus arbitration. |
| θJA | 58°C/W (SOIC-DW) - allows sustained 8-channel switching at ambient temperatures up to 85°C without forced airflow. |
| Ioff | ±100 µA at VCC = 0 - blocks current flow between powered and unpowered sections during hot-swap events. |
Pinout & Package
SN74LVTH540DWR uses a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm, with gull-wing leads, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Data Inputs | Noninverting inputs with bus-hold; accept 0–5.5 V signals independent of VCC. |
| 9 | GND | Ground reference for all internal logic and output drivers; requires low-inductance PCB connection. |
| 10 | VCC | 3.3-V supply input; bypass with 0.1 µF ceramic capacitor placed within 5 mm of pin. |
| 11, 19 | OE1, OE2 | Active-low 3-state enables; both must be low for output drive; OR'd internally via AND gate logic. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Y1–Y8 Outputs | Noninverting buffered outputs; each sinks 64 mA or sources 32 mA; high-impedance when OE1 or OE2 high. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal interface | Accepts 5-V TTL inputs and drives 5-V loads while operating from 3.3-V VCC, eliminating external level shifters in hybrid voltage systems. |
| Bus-hold inputs | Internally latches undriven A1–A8 pins at last-valid logic state, reducing BOM count and board space versus discrete resistor networks. |
| Hot-insertion support | Ioff and power-up 3-state ensure zero current backflow and glitch-free enable sequencing during live module replacement. |
| Output ground bounce control | VOLP < 0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes during simultaneous output switching. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - withstands transient overcurrent events without destructive latch-up in industrial environments. |
Applications
| Memory Address Buffering | Backplane Bus Interface |
|---|---|
|
Use Scenario: Driving 8-bit address lines from a 3.3-V microcontroller to multiple 5-V SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting octal buffer providing voltage-level translation and fanout amplification with controlled edge rates. Use Value: Eliminates need for discrete level translators and pull-up resistors while maintaining <4.6 ns propagation delay for timing-critical address setup. |
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a legacy 5-V parallel backplane carrying control/status signals across multiple slots. IC Role / Device Role / Timing Role: Bidirectional-capable buffer (with external direction control) managing signal integrity across mixed-voltage subsystem boundaries. Use Value: Supports hot-plug insertion of daughter cards by disabling outputs during power ramp-up and blocking backfeed current via Ioff. |
| Industrial PLC I/O Expansion | Test Equipment Signal Conditioning |
|
Use Scenario: Buffering digital I/O lines from a 3.3-V ARM-based controller to 5-V optocoupler inputs in programmable logic controller modules. IC Role / Device Role / Timing Role: High-drive buffer ensuring reliable optocoupler LED turn-on under worst-case VCC (2.7 V) and temperature (85°C). Use Value: Delivers 64 mA sink current per channel at 2.7 V, exceeding typical 20-mA optocoupler requirements with margin for aging and voltage drop. |
Use Scenario: Isolating and conditioning DUT address/data signals in automated test equipment where 3.3-V ASICs drive 5-V logic analyzers or pattern generators. IC Role / Device Role / Timing Role: Input-protection and drive-strengthening buffer preventing signal degradation across long PCB traces or cables. Use Value: Low 7 pF output capacitance and <4.6 ns tPHL/tPLH preserve signal fidelity up to 100 MHz clock domains without added jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC541APWR | Lower drive (24 mA), no bus-hold, 1.65–3.6 V VCC; lacks Ioff and hot-insertion support. | Suitable only for fully 3.3-V systems without 5-V interfacing or hot-swap requirements. | Select when cost or power is prioritized over mixed-voltage robustness and system modularity. |
| 74ALVC16244DGGR | 16-bit, higher speed (2.1 ns), no bus-hold, 1.65–3.6 V; requires external pullups and lacks Ioff. | Used in high-density 3.3-V-only data paths where channel count outweighs interface flexibility. | Choose for compact 16-bit buffering where board space is constrained and 5-V compatibility is unnecessary. |
Compared with SN74LVTH540DWR, SN74LVC541APWR offers lower static power but sacrifices 5-V tolerance and hot-swap safety; 74ALVC16244DGGR doubles channel count yet removes bus-hold and mixed-voltage capability - making SN74LVTH540DWR uniquely suited for legacy-compatible, field-upgradeable designs.
Availability
SN74LVTH540DWR is available at Aetrix Electronics and suitable for memory address buffering, backplane bus interfacing, industrial PLC I/O expansion, and test equipment signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for SN74LVTH540DWR 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, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The SN74LVTH540DWR belongs to TI's LVTH logic family, engineered specifically for robust mixed-voltage system integration in telecom infrastructure, industrial automation, and legacy-compatible computing platforms.
FAQ
What is the recommended operating voltage range for the SN74LVTH540DWR?
The SN74LVTH540DWR operates reliably from 2.7 V to 3.6 V on VCC. This range supports unregulated battery inputs down to 2.7 V and accommodates typical 3.3-V supply tolerances. Operation outside this window risks functional failure or latch-up; the absolute maximum VCC is 4.6 V, but sustained use above 3.6 V voids parametric guarantees.
Does the SN74LVTH540DWR support hot insertion, and how is it implemented?
Yes, the SN74LVTH540DWR supports hot insertion through two integrated features: Ioff circuitry disables outputs when VCC = 0, preventing damaging current backflow, and power-up 3-state forces outputs into high-impedance until VCC exceeds 1.5 V. These functions are inherent to the silicon design and require no external components to enable safe live module replacement.
How does the bus-hold feature on the SN74LVTH540DWR eliminate external resistors?
The SN74LVTH540DWR integrates active bus-hold circuitry on all A1–A8 inputs, drawing ±500 µA to maintain the last-valid logic state when inputs float. This replaces typical 10-kΩ pullup/pulldown networks, reducing component count, PCB area, and potential noise coupling - confirmed in TI's SCBA004 application report on floating CMOS inputs.
What is the pinout configuration of the SN74LVTH540DWR, and how are enables structured?
The SN74LVTH540DWR uses a 20-pin SOIC-DW package with A1–A8 on pins 1–8, GND on pin 9, VCC on pin 10, OE1 on pin 11, OE2 on pin 19, and Y1–Y8 on pins 12,13,14,15,16,17,18,20. Enables OE1 and OE2 feed an internal 2-input AND gate with active-low logic: either high forces all Y outputs into high-impedance.
Can the SN74LVTH540DWR interface directly between 3.3-V and 5-V logic systems?
Yes, the SN74LVTH540DWR is explicitly designed for mixed-mode operation: its inputs tolerate 0–5.5 V regardless of VCC, and its outputs drive 5-V loads while powered from 3.3 V. This eliminates external level translators in applications like FPGA-to-SRAM interfacing, as verified in the "Support Mixed-Mode Signal Operation" section of the SCBS681G datasheet.
SN74LVTH540DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVTH540DWR FAQ
1.How can I place an order for SN74LVTH540DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH540DWR 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 SN74LVTH540DWR reliable?
The price and inventory of SN74LVTH540DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH540DWR is usually 5 days.
3.What payment methods are accepted for SN74LVTH540DWR?
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4.How is shipping managed for SN74LVTH540DWR?
SN74LVTH540DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH540DWR 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 SN74LVTH540DWR?
For technical support, including SN74LVTH540DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH540DWR requirements.
6.How does Aetrix verify that SN74LVTH540DWR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH540DWR 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 SN74LVTH540DWR meets industry standards.
7.What is the process for return or replacement of SN74LVTH540DWR?
All SN74LVTH540DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH540DWR, 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 SN74LVTH540DWR part is unused and in its original packaging.
Return procedure for SN74LVTH540DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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