Texas Instruments SN74LVCZ240ANS

Overview

SN74LVCZ240ANS from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 2.7-V to 3.6-V V_CC operation. It features two independent 4-bit channels, separate output-enable (OE) inputs, 6.5 ns max propagation delay at 3.3 V, 5.5-V-tolerant inputs, and I_off/power-up 3-state support for hot insertion. It serves as a level-translating bus driver in mixed-voltage memory address and clock distribution systems.

For engineers reviewing the SN74LVCZ240ANS datasheet, SN74LVCZ240ANS pinout, SN74LVCZ240ANS application, or SN74LVCZ240ANS equivalent, key selection criteria include 3.3-V supply compatibility, 5-V input tolerance, dual OE control, high-speed 3-state switching, and SOIC-20 package thermal performance (θ_JA = 60°C/W).

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (1OE, 2OE) controlling its Y outputs. Inputs accept voltages up to 5.5 V regardless of V_CC, enabling bidirectional 3.3-V/5-V voltage translation without external biasing.

Its I_off circuitry disables outputs during power-down to prevent backflow current, while power-up 3-state ensures high-impedance outputs during V_CC ramp (0–1.5 V), eliminating bus contention at power transition. Latch-up immunity exceeds 100 mA per JESD 78 Class II.

Key Specifications

Pinout & Package

SN74LVCZ240ANS uses a 20-pin SOIC (NS) package with 0.300-inch body width, JEDEC MO-194 compliant, θ_JA = 60°C/W, RoHS-compliant green finish (CU NIPDAU), MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240ANSR and 74LVCH240PW, the SN74LVCZ240ANS uniquely combines 5-V-tolerant inputs, sub-0.8 V ground bounce, I_off-enabled hot insertion, and matched dual-OE control-making it the only choice for robust, high-speed, mixed-voltage bus driving in industrial backplanes and memory subsystems.

Availability

SN74LVCZ240ANS is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and mixed-voltage I/O expansion requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.

Supply support for SN74LVCZ240ANS 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 innovation in high-reliability interface and power management ICs.

The SN74LVCZ240ANS belongs to TI's LVCZ logic family, engineered specifically to improve density and noise immunity in 3-state memory address drivers, clock drivers, and bus-oriented transceivers operating in mixed-voltage systems.

FAQ

What is the maximum input voltage the SN74LVCZ240ANS can tolerate?

The SN74LVCZ240ANS accepts input voltages from 0 V to 5.5 V, independent of V_CC. This 5-V tolerance enables direct interfacing with legacy 5-V logic families while operating from a 3.3-V supply, eliminating external level shifters in mixed-voltage designs. The internal input clamping structure safely handles overvoltage without latch-up or damage under recommended conditions.

Does the SN74LVCZ240ANS support hot insertion, and how is it implemented?

Yes, the SN74LVCZ240ANS supports hot insertion via two integrated features: I_off circuitry disables outputs when V_CC = 0, preventing backflow current into powered-down boards; and power-up 3-state forces outputs into high-impedance during V_CC ramp (0–1.5 V), avoiding bus contention. These functions are inherent to the SN74LVCZ240ANS silicon design and require no external components.

What is the propagation delay of the SN74LVCZ240ANS at 3.3 V, and how does it impact timing budgets?

The SN74LVCZ240ANS has a maximum propagation delay (t_pd) of 6.5 ns at V_CC = 3.3 V and 25°C. This value applies to both rising and falling edges across all eight channels. In a 100-MHz system with 10-ns clock periods, this delay consumes <7% of the cycle-enabling tight timing margins for memory address latching, clock fanout, and synchronous bus interfaces without derating.

Can the SN74LVCZ240ANS drive standard 50-Ω transmission lines directly?

No, the SN74LVCZ240ANS is not designed for direct 50-Ω line driving. Its output drive strength (±24 mA) targets 15-pF capacitive loads typical of PCB traces and IC inputs-not 50-Ω characteristic impedance. For transmission-line applications, external series termination (e.g., 33 Ω) or dedicated line drivers should be used. The SN74LVCZ240ANS excels in point-to-multipoint local bus driving, not RF or high-speed serial interconnects.

What package type and thermal characteristics apply to the SN74LVCZ240ANS?

The SN74LVCZ240ANS uses a 20-pin SOIC (NS) package with 0.300-inch body width, JEDEC MO-194 compliant, and θ_JA = 60°C/W. Its green RoHS-compliant finish uses CU NIPDAU plating and is rated MSL Level-1 (unlimited floor life). The package supports reflow soldering per JEDEC J-STD-020 and delivers superior thermal performance versus TSSOP or TVSOP variants in high-density layouts.