Texas Instruments SN74LVCZ240ADWR

Overview

SN74LVCZ240ADWR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for memory address driving, clock distribution, and bus interfacing in 2.7-V to 3.6-V systems. It features dual 4-bit channels, independent output-enable (1OE/2OE) controls, 6.5 ns max propagation delay at 3.3 V, 5.5-V-tolerant inputs, and hot-insertion support via Ioff and power-up 3-state.

For engineers reviewing the SN74LVCZ240ADWR datasheet, SN74LVCZ240ADWR pinout, SN74LVCZ240ADWR application, or SN74LVCZ240ADWR equivalent, key selection criteria include mixed-voltage translation capability (5-V input / 3.3-V VCC), low ground bounce (<0.8 V), high noise immunity (VOHV >2 V), and SOIC-20 package compatibility with industrial temperature range (–40°C to 85°C).

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable control (1OE and 2OE). When OE is low, data passes from A inputs to Y outputs; when high, outputs enter high-impedance state - enabling bidirectional bus sharing without contention.

Its Ioff circuitry disables outputs during power-down to prevent backflow current, while power-up 3-state ensures outputs remain high-Z until VCC exceeds 1.5 V. Input tolerance up to 5.5 V allows seamless interfacing between 3.3-V logic and legacy 5-V peripherals.

Key Specifications

Pinout & Package

SN74LVCZ240ADWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm max height, with standard 1.27-mm pitch and RoHS-compliant CU NIPDAU finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCZ240ADWR, SN74LVC240APWR offers identical functionality without Z-series noise mitigation, while 74LVC240ADBVR provides identical logic behavior in a smaller TVSOP package - requiring thermal validation but enabling denser layouts.

Availability

SN74LVCZ240ADWR is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial bus interfaces, and mixed-voltage logic translation requiring stable component supply and long-term manufacturability.

Supply support for SN74LVCZ240ADWR 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 and power management ICs.

The SN74LVCZ240ADWR belongs to TI's LVCZ logic family, engineered specifically to improve noise immunity and timing density in 3.3-V memory, clock, and bus applications - addressing ground bounce and undershoot challenges in high-speed digital systems.

FAQ

What is the operating voltage range for SN74LVCZ240ADWR?

The SN74LVCZ240ADWR operates over a supply voltage range of 2.7 V to 3.6 V. This range ensures compatibility with standard 3.3-V systems while maintaining timing and drive specifications. Operation outside this range may result in undefined behavior or reduced reliability. The SN74LVCZ240ADWR is not rated for 5-V VCC operation, though its inputs tolerate up to 5.5 V.

Does SN74LVCZ240ADWR support hot insertion?

Yes, SN74LVCZ240ADWR supports hot insertion through integrated Ioff and power-up 3-state circuitry. When powered down, Ioff disables outputs to prevent damaging current backflow. During power-up or power-down, outputs remain in high-impedance state until VCC stabilizes above 1.5 V - eliminating bus contention. This makes SN74LVCZ240ADWR suitable for live-plug applications such as modular backplanes.

What is the pin configuration of SN74LVCZ240ADWR?

SN74LVCZ240ADWR uses a 20-pin SOIC (DW) package with standard pinout: Pins 1–10 and 20–11 follow TI's top-view layout, including dual OE inputs (1OE at Pin 1, 2OE at Pin 20), eight inputs (1A1–1A4, 2A1–2A4), eight 3-state outputs (1Y1–1Y4, 2Y1–2Y4), VCC (Pin 11), and GND (Pin 10). Full pin mapping is confirmed in TI's SCES273H datasheet Figure 1.

Can SN74LVCZ240ADWR translate 5-V logic to 3.3-V levels?

SN74LVCZ240ADWR accepts 5-V inputs while operating at 3.3-V VCC, making it effective for unidirectional 5-V-to-3.3-V level translation. Its outputs swing rail-to-rail (0 V to VCC), so they produce true 3.3-V logic levels. However, it does not support bidirectional translation or 3.3-V-to-5-V output - for that, a dedicated bidirectional translator like TXB0108 is required. The SN74LVCZ240ADWR is optimized for address, clock, and control line buffering in mixed-voltage systems.

What thermal considerations apply to SN74LVCZ240ADWR in SOIC-20 package?

SN74LVCZ240ADWR in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W. At maximum continuous output current (±24 mA per pin) and worst-case ambient temperature (85°C), thermal design must ensure junction temperature stays below 150°C. Derating is recommended above 70°C ambient; PCB copper area and airflow significantly impact real-world thermal performance. The SN74LVCZ240ADWR datasheet specifies absolute max ratings and recommends adhering to recommended operating conditions for sustained reliability.