Texas Instruments SN74LVCZ240ADBRE4

Overview

SN74LVCZ240ADBRE4 from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 2.7-V to 3.6-V VCC operation. It features two independent 4-bit channels, separate output-enable (1OE/2OE) controls, 5.5-V-tolerant inputs, 6.5-ns max propagation delay at 3.3 V, and Ioff support for hot insertion-used in memory address buffering, clock distribution, and mixed-voltage bus interfacing.

For engineers reviewing the SN74LVCZ240ADBRE4 datasheet, SN74LVCZ240ADBRE4 pinout, SN74LVCZ240ADBRE4 application, or SN74LVCZ240ADBRE4 equivalent, key selection criteria include 3.3-V supply compatibility, 5-V input tolerance, dual 4-bit 3-state channel architecture, ground-bounce/undershoot performance, and SSOP-20 packaging for high-density PCB layouts.

Technical Context

The SN74LVCZ240ADBRE4 implements dual independent 4-bit noninverting buffers with active-low 3-state control per channel (1OE, 2OE). Each channel passes data from A-inputs to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high. Input voltage tolerance up to 5.5 V enables direct interfacing with 5-V logic while operating at 3.3-V VCC.

It integrates Ioff circuitry to disable outputs during power-down, preventing backflow current, and power-up 3-state logic that ensures high-impedance outputs during VCC ramp (0–1.5 V), supporting hot-insertion in backplane and modular systems. Latch-up immunity exceeds 100 mA per JESD 78 Class II.

Key Specifications

Pinout & Package

SN74LVCZ240ADBRE4 is packaged in a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.2-mm body width, and 2.65-mm max height-optimized for automated assembly and space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCZ240ADBRE4, SN74LVC240APWR offers identical functionality in a functionally equivalent TSSOP package, while SN74LVCH240APW adds bus-hold for floating-input resilience at slight timing cost-enabling trade-offs between layout simplicity and input stability.

Availability

SN74LVCZ240ADBRE4 is available at Aetrix Electronics and suitable for memory address buffering, industrial backplane interfaces, and clock distribution networks requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74LVCZ240ADBRE4 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 delivering analog and embedded processing solutions, with leadership in logic, power management, and signal chain technologies.

The SN74LVCZ240ADBRE4 belongs to TI's LVCZ logic family-engineered for high-speed, low-voltage 3.3-V systems with 5-V tolerant inputs, targeting memory, bus, and clock interface applications in industrial and communications equipment.

FAQ

What is the maximum input voltage rating for SN74LVCZ240ADBRE4?

The SN74LVCZ240ADBRE4 supports input voltages from –0.5 V to 5.5 V, independent of VCC. This 5.5-V absolute maximum rating enables safe interfacing with 5-V logic families while operating at 3.3-V supply, eliminating external level-shifting components in mixed-voltage designs. The device maintains full functionality and ESD robustness within this range under recommended operating conditions.

Does SN74LVCZ240ADBRE4 support hot insertion, and how is it implemented?

Yes, SN74LVCZ240ADBRE4 supports hot insertion via integrated Ioff and power-up 3-state circuitry. When VCC = 0 V, Ioff disables all outputs to block reverse current flow. During power-up/down (VCC < 1.5 V), outputs remain in high-impedance state regardless of OE state. This dual protection prevents bus contention and backdrive damage in live-insertion systems like modular PLCs or telecom line cards.

What is the propagation delay of SN74LVCZ240ADBRE4 at 3.3 V, and how does it impact timing-critical designs?

The SN74LVCZ240ADBRE4 has a maximum propagation delay (tpd) of 6.5 ns at VCC = 3.3 V and TA = 25°C. This specification ensures predictable timing margins in high-speed address and clock distribution paths. At 100-MHz bus frequencies, the delay contributes <7% of the clock period, allowing robust setup/hold compliance-even with additional PCB trace delays-when used in memory subsystems or synchronous peripheral interfaces.

How does the ground bounce (VOLP) specification of SN74LVCZ240ADBRE4 affect system noise performance?

SN74LVCZ240ADBRE4 specifies typical VOLP < 0.8 V at VCC = 3.3 V and TA = 25°C. This low ground bounce value directly limits simultaneous switching noise (SSN) injected into shared ground planes during output transitions. In dense memory or bus applications with multiple drivers switching in parallel, this characteristic helps maintain signal integrity, reduces false triggering on adjacent nets, and eases EMC compliance without requiring additional decoupling beyond standard practice.

What package type and lead count does SN74LVCZ240ADBRE4 use, and what are its key mechanical attributes?

SN74LVCZ240ADBRE4 uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.2-mm body width, and 2.65-mm maximum height. Its JEDEC MS-013 compliant outline supports fine-pitch automated placement and reflow. The package features gull-wing leads for visual solder-joint inspection and is rated MSL Level-1 (unlimited floor life), making it suitable for high-reliability industrial and telecom manufacturing environments.