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Texas Instruments SN74LVTH540DBR
- Part No.:
- SN74LVTH540DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH540DBR.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
SN74LVTH540DBR from Texas Instruments is an octal buffer/driver IC designed for 3.3-V VCC operation with mixed-mode 5-V input/output compatibility, supporting bus-line driving and memory address buffering in industrial and embedded systems. It features dual active-low 3-state enable inputs (OE1/OE2), bus-hold on all data inputs, Ioff protection, and operates from 2.7 V to 3.6 V.
For engineers reviewing the SN74LVTH540DBR datasheet, SN74LVTH540DBR pinout, SN74LVTH540DBR application, or SN74LVTH540DBR equivalent, key selection considerations include its 20-pin SSOP package, 3.3-V TTL-compatible interface, hot-insertion support via power-up 3-state and Ioff, bus-hold elimination of external resistors, and guaranteed 64-mA sink capability per output at VCC = 3 V.
Technical Context
The SN74LVTH540DBR implements an octal noninverting buffer architecture with two independent active-low 3-state control inputs (OE1 and OE2) wired as a 2-input AND gate - either high disables all eight outputs into high-impedance. Its bus-hold circuitry actively maintains valid logic states on undriven A1–A8 inputs without external pullups, drawing ±75 µA at VCC = 3 V.
Designed for mixed-voltage system interfacing, it accepts 5-V-tolerant inputs while operating from a 3.3-V supply, and delivers TTL-level outputs compatible with legacy 5-V buses. Absolute maximum ratings permit input/output voltages up to 7 V when powered down, and thermal resistance is specified at θJA = 70°C/W for the DB package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V with stable logic performance. |
| IOL (per output) | 64 mA at VCC = 3 V - drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH/tPHL | Typ. 3.8 ns at VCC = 3.3 V, CL = 50 pF - enables high-speed address/data bus buffering in memory subsystems. |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V microcontrollers or FPGAs without level shifters. |
| Bus-Hold Current | ±75 µA at VCC = 3 V - actively holds floating inputs at valid logic levels, eliminating external biasing components. |
| Ioff | ±100 µA at VCC = 0 - prevents backflow current during hot insertion or partial power-down scenarios. |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-grade robustness requirements for board-level handling and field operation. |
Pinout & Package
SN74LVTH540DBR is housed in a 20-pin Small Outline Shrink Plastic Package (SSOP-DB), 7.5 mm × 5.6 mm body size, 0.65 mm lead pitch, 2.0 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (A1–A8) | Noninverting inputs with integrated bus-hold; tolerate 5-V signals at 3.3-V VCC. |
| 9 | GND | Ground reference for all internal circuitry and output drivers. |
| 10 | VCC | 3.3-V supply input; supports operation down to 2.7 V with full functionality. |
| 11, 19 | Output Enables (OE1, OE2) | Active-low AND-gated control: both must be low for Y1–Y8 to drive; either high forces high-Z. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Outputs (Y1–Y8) | Noninverting buffered outputs; each sinks 64 mA or sources 32 mA at VCC = 3 V. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs and outputs with 3.3-V VCC - eliminates level-shifter ICs in 3.3/5-V interface bridges. |
| Bus-hold on all data inputs | Eliminates need for external pullup/pulldown resistors on A1–A8 - reduces BOM count and PCB area. |
| Hot-insertion support | Ioff and power-up 3-state ensure no backfeed or bus contention during live card replacement. |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - maintains signal integrity under heavy switching loads. |
| Latch-up immunity | >500 mA per JESD 17 - ensures reliability in noisy industrial environments with transient coupling. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
|
Use Scenario: Buffering address lines between a 3.3-V microcontroller and 5-V SRAM or EPROM in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting octal buffer providing voltage-level translation and drive strength enhancement for parallel address buses. Use Value: Enables direct connection without level shifters while delivering 64-mA sink capability to meet TTL fanout requirements. |
Use Scenario: Isolating and driving shared data bus lines in factory automation I/O modules with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Bidirectional-capable buffer (via OE control) managing bus arbitration and noise isolation in multi-drop configurations. Use Value: Bus-hold prevents floating inputs during bus release; Ioff avoids backfeed when modules are hot-swapped. |
| Embedded System Expansion | Legacy Peripheral Interfacing |
|
Use Scenario: Expanding GPIO count of a 3.3-V SoC to drive 5-V LCD controllers or keypad scanners in medical devices. IC Role / Device Role / Timing Role: Level-translating output driver with precise propagation delay (typ. 3.8 ns) for timing-critical peripheral handshaking. Use Value: Guaranteed tPHL/tPLH ≤ 4.7 ns ensures setup/hold compliance with 5-V peripheral timing specs. |
Use Scenario: Interfacing modern 3.3-V FPGA I/O banks to legacy 5-V ISA-bus peripherals in test equipment upgrades. IC Role / Device Role / Timing Role: Input-tolerant buffer accepting 5-V signals while sourcing/sinking TTL-compatible currents to maintain bus integrity. Use Value: 5.5-V input rating and 24-mA source capability allow direct connection to 5-V open-collector bus drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC541APW | Lower drive strength (24 mA sink), no bus-hold, 1.65–3.6 V VCC range. | Suitable for low-power, single-supply 3.3-V-only systems without 5-V tolerance needs. | Select when cost and power efficiency outweigh 5-V interface and bus-hold requirements. |
| SN74AHCT541N | 5-V-only supply (4.5–5.5 V), higher propagation delay (typ. 8 ns), no Ioff or bus-hold. | Applicable only in legacy 5-V designs requiring TTL-compatible inputs/outputs. | Choose only for pure 5-V environments where mixed-voltage operation is unnecessary. |
Compared with SN74LVC541APW and SN74AHCT541N, the SN74LVTH540DBR uniquely combines 5-V input tolerance, bus-hold, Ioff, and 64-mA drive in a 3.3-V system - making it irreplaceable for robust mixed-voltage bus interfacing where component count reduction and hot-swap reliability are critical.
Availability
SN74LVTH540DBR is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and test equipment applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74LVTH540DBR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH540DBR belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interfacing - enabling seamless integration between 3.3-V logic and legacy 5-V buses in space-constrained industrial designs.
FAQ
What is the recommended operating voltage range for the SN74LVTH540DBR?
The SN74LVTH540DBR is specified to operate from 2.7 V to 3.6 V on VCC. This range supports unregulated battery-powered systems and accommodates typical 3.3-V supply tolerances. Operation below 2.7 V is not guaranteed, and exceeding 3.6 V violates absolute maximum ratings. All electrical characteristics in the datasheet - including output drive, propagation delay, and bus-hold behavior - are validated across this full range.
Does the SN74LVTH540DBR require external pullup resistors on its inputs?
No, the SN74LVTH540DBR does not require external pullup or pulldown resistors on its A1–A8 inputs due to integrated bus-hold circuitry. This feature actively maintains valid logic states on unused or undriven inputs, drawing ±75 µA at VCC = 3 V. Using external resistors with enabled bus-hold is explicitly discouraged in the datasheet as it may cause contention or excessive current draw.
How does the 3-state enable logic work on the SN74LVTH540DBR?
The SN74LVTH540DBR uses two active-low output-enable inputs (OE1 and OE2) configured as a 2-input AND gate. Both OE1 and OE2 must be low for outputs Y1–Y8 to drive their respective inputs A1–A8. If either OE1 or OE2 is high, all eight outputs enter high-impedance state - a design that provides flexible bus control and redundancy. This logic is implemented internally and requires no external gating.
Can the SN74LVTH540DBR be used in hot-swap applications?
Yes, the SN74LVTH540DBR is explicitly designed for hot-insertion applications. Its Ioff circuitry disables outputs and blocks current backflow when VCC = 0, and its power-up 3-state function ensures outputs remain in high-impedance during power ramp-up/down (0–1.5 V). These features prevent bus conflicts and damage during live module replacement in backplane or modular systems.
What package type and dimensions does the SN74LVTH540DBR use?
The SN74LVTH540DBR uses a 20-pin SSOP (Shrink Small Outline Package) with designation DB. Its body measures 7.5 mm × 5.6 mm, with 0.65 mm lead pitch and maximum height of 2.0 mm. The package has RoHS-compliant NiPdAu (NIPDAU) lead finish, MSL Level-1 rating, and is supplied in tape-and-reel format (2000 units per reel), optimized for automated SMT assembly.
SN74LVTH540DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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-SSOP
SN74LVTH540DBR FAQ
1.How can I place an order for SN74LVTH540DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH540DBR 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 SN74LVTH540DBR reliable?
The price and inventory of SN74LVTH540DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH540DBR is usually 5 days.
3.What payment methods are accepted for SN74LVTH540DBR?
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4.How is shipping managed for SN74LVTH540DBR?
SN74LVTH540DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH540DBR 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 SN74LVTH540DBR?
For technical support, including SN74LVTH540DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH540DBR requirements.
6.How does Aetrix verify that SN74LVTH540DBR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH540DBR 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 SN74LVTH540DBR meets industry standards.
7.What is the process for return or replacement of SN74LVTH540DBR?
All SN74LVTH540DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH540DBR, 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 SN74LVTH540DBR part is unused and in its original packaging.
Return procedure for SN74LVTH540DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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