Texas Instruments SN74LVC2G240DCUR

Overview

SN74LVC2G240 from Texas Instruments is a dual noninverting buffer driver with 3-state outputs, designed for 1.65-V to 5.5-V VCC operation. It features ±24-mA output drive at 3.3 V, 4.6-ns max propagation delay at 3.3 V, and Ioff support for live insertion - used in memory address buffering, bus-oriented receivers, and clock distribution systems.

For engineers reviewing the SN74LVC2G240 datasheet, SN74LVC2G240 pinout, SN74LVC2G240 application, or SN74LVC2G240 equivalent, key selection criteria include 3-state control per channel, 5.5-V tolerant inputs, low ICC (10 µA max), and NanoFree™ package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 1-bit noninverting buffers, each with dedicated output-enable (OE) inputs controlling high-impedance state entry/exit. Logic operation follows positive-logic behavior: OE low enables data pass-through (A → Y); OE high forces Y into high-Z.

It supports mixed-voltage interfacing via 5.5-V-tolerant inputs while operating from as low as 1.65 V, and includes Ioff circuitry that disables outputs during partial power-down to prevent back-drive current - critical for hot-swap and system-level power sequencing.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.0 mm × 1.25 mm footprint, 0.5-mm lead pitch, 0.9-mm max height, RoHS-compliant NiPdAu/Sn lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G240, SN74LVC2G241DCUR offers functional equivalence except for inverted outputs - requiring redesign of connected logic - while 74LVC2G125DCUR omits Ioff, limiting use to fully powered systems without hot-swap requirements.

Availability

SN74LVC2G240 is available at Aetrix Electronics and suitable for memory address buffering, industrial bus interface, and low-power sensor hub applications requiring stable component supply across automotive, industrial, and IoT product lifecycles.

Supply support for SN74LVC2G240 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 company specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.

The SN74LVC2G240 belongs to TI's LVC logic family, engineered for low-voltage, high-speed, 3-state buffering in space-constrained and mixed-voltage digital systems.

FAQ

What is the recommended pull-up resistor value for OE pins on the SN74LVC2G240 during power-up?

The SN74LVC240 datasheet specifies that OE should be tied to VCC through a pullup resistor to ensure high-impedance state at power-up. The minimum resistor value depends on the current-sinking capability of the driving source; for typical microcontroller GPIO, a 10-kΩ resistor is sufficient. The SN74LVC2G240 itself draws negligible current into OE, so the resistor primarily serves to override any floating condition - critical because OE high forces outputs into high-Z.

Does the SN74LVC2G240 support operation at 1.65 V VCC while maintaining full 5.5-V input tolerance?

Yes, the SN74LVC2G240 maintains 5.5-V input tolerance across its entire 1.65-V to 5.5-V VCC range. At 1.65 V VCC, VIH is specified as 0.65 × VCC (≈1.07 V) and VIL as 0.35 × VCC (≈0.58 V), ensuring reliable logic recognition even with 5.5-V input signals. This makes the SN74LVC2G240 suitable for down-translation applications without external components.

Can the SN74LVC2G240 be used in a wired-OR configuration using its 3-state outputs?

Yes, the SN74LVC2G240 supports wired-OR implementation: connect all Y outputs (1Y and 2Y) to a common node pulled up externally, then control each OE independently. When an OE is low, its Y output drives the bus; when high, it disconnects. This avoids contention and leverages the SN74LVC2G240's fast tdis (5.5 ns max at 3.3 V) for clean bus arbitration - commonly used in interrupt aggregation and sensor alert consolidation.

What thermal considerations apply to the SN74LVC2G240 in VSSOP-8 (DCU) package?

The SN74LVC2G240 in DCU package has a θJA of 227°C/W. At maximum continuous output current (±24 mA) and 3.3-V VCC, power dissipation remains below 100 mW - resulting in <23°C junction rise above ambient. No heatsink is needed, but layout best practices (e.g., thermal vias under exposed pad if present, adequate copper pour) are recommended for sustained high-load operation in +125°C environments.

Is the SN74LVC2G240 pin-compatible with other members of the SN74LVC2Gxx dual-buffer family?

No - the SN74LVC2G240 has a unique pinout optimized for dual independent OE control. For example, SN74LVC2G241 (inverting) shares identical pin mapping, but SN74LVC2G125 (noninverting, shared OE) uses different pin assignments (e.g., pin 1 = 1A, not 1OE). Always verify pin functions against the specific device's datasheet; substituting without layout review risks functional failure.