Texas Instruments SN74LVC540ADGVR

Overview

SN74LVC540ADGVR from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for bus interface and signal redriving in 1.65V–3.6V systems. It features dual active-low output enables (OE1/OE2), 5.3ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-enabling use in hot-swap backplane buffers and mixed-voltage I/O isolation.

For engineers reviewing the SN74LVC540ADGVR datasheet, SN74LVC540ADGVR pinout, SN74LVC540ADGVR application, or SN74LVC540ADGVR equivalent, key selection criteria include 3-state timing control, VCC-referenced output drive strength, thermal performance in TVSOP-20, and compatibility with 5V-input/3.3V-core logic domains.

Technical Context

The SN74LVC540ADGVR implements eight identical inverting buffer channels sharing two synchronized active-low output enable inputs (OE1 and OE2), requiring both to be low for output activation. Its balanced CMOS 3-state outputs deliver ±24mA drive at 3V while maintaining sub-0.55V VOL and >2.2V VOH under load.

It supports partial power-down via Ioff circuitry that disables all outputs when VCC = 0V, limiting leakage to ±10μA. Input tolerance up to 5.5V enables safe interfacing with legacy 5V logic without level shifters, and its 4pF input capacitance and 5.5pF output capacitance minimize loading on high-speed traces.

Key Specifications

Pinout & Package

DGVR denotes the TVSOP-20 (Thin Very Small Outline Package) variant: 5.0mm × 6.4mm body size, 0.4mm lead pitch, 20-pin surface-mount package optimized for high-density routing and thermal dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APW, SN74LVC540ADGVR offers superior board-area efficiency and marginally better thermal performance in TVSOP-20; versus SN74LVC540ADGV, it differs only in packaging logistics-not electrical or mechanical design-making DGVR optimal for automated SMT assembly with tight placement tolerances.

Availability

SN74LVC540ADGVR is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive infotainment signal routing, and embedded computing bus isolation requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVC540ADGVR 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 experience in high-reliability interface IC design.

The SN74LVC540ADGVR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed signal conditioning in mixed-voltage digital systems-from portable electronics to factory-floor controllers.

FAQ

What is the maximum capacitive load the SN74LVC540ADGVR can drive while meeting all datasheet specifications?

The SN74LVC540ADGVR is specified to drive loads ≤50pF while maintaining guaranteed timing, VOH, and VOL performance across temperature and voltage ranges. Exceeding this capacitance increases propagation delay and may degrade noise margins; for heavier loads, add series damping resistors or use multiple parallel outputs per channel. The SN74LVC540ADGVR's 5.5pF typical output capacitance helps minimize total node loading.

Does the SN74LVC540ADGVR support true bidirectional data flow?

No, the SN74LVC540ADGVR is a unidirectional inverting buffer with fixed input (A1–A8) and output (Y1–Y8) terminals. It does not support automatic direction sensing or bus transceiver functionality. For bidirectional applications, consider dedicated transceivers like the SN74LVC245A. The SN74LVC540ADGVR's dual OE pins provide synchronous 3-state control but do not alter signal directionality.

How should unused inputs be handled on the SN74LVC540ADGVR?

All unused inputs (A1–A8) on the SN74LVC540ADGVR must be terminated to either VCC or GND-never left floating-to prevent excessive power consumption, oscillation, or latch-up. A 10kΩ pull-up or pull-down resistor is recommended for unused inputs that may transition during system operation; direct connection is acceptable for permanently static inputs. This requirement applies regardless of OE state and is critical for stable SN74LVC540ADGVR operation.

Can the SN74LVC540ADGVR be used with a 5V supply voltage?

No, the SN74LVC540ADGVR is rated for VCC between 1.65V and 3.6V only; applying 5V to VCC exceeds its Absolute Maximum Rating and will cause permanent damage. However, its inputs tolerate up to 5.5V regardless of VCC, enabling safe connection to 5V signal sources when powered at 3.3V or lower. Always verify VCC remains within 1.65V–3.6V when using the SN74LVC540ADGVR in mixed-voltage systems.

What is the purpose of the dual output enable pins (OE1 and OE2) on the SN74LVC540ADGVR?

The SN74LVC540ADGVR requires both OE1 and OE2 to be logic low for any output to be active; if either is high, all eight Y1–Y8 outputs enter high-impedance state. This dual-enable architecture provides redundancy and fault tolerance-e.g., one OE can be driven by a system controller and the other by a watchdog timer-ensuring fail-safe bus isolation. It also allows flexible control schemes such as OR-ing OE signals for multi-source arbitration. This behavior is intrinsic to the SN74LVC540ADGVR's logic design and cannot be overridden.