Texas Instruments SN74LVCZ240APWR

Overview

SN74LVCZ240APWR from Texas Instruments is an octal buffer with power-up 3-state outputs, configured as two independent banks of four non-inverting drivers each, operating from 2.7V to 3.6V supply and accepting 5.5V-tolerant inputs. It delivers 6.5ns max propagation delay at 3.3V and supports hot insertion via Ioff and power-up 3-state functionality in industrial bus interface applications.

For engineers reviewing the SN74LVCZ240APWR datasheet, SN74LVCZ240APWR pinout, SN74LVCZ240APWR application, or SN74LVCZ240APWR equivalent, key selection criteria include 5.5V input tolerance with 3.3V VCC, dual active-low output enable control, balanced CMOS 3-state drive capability (±24mA), ground bounce <0.8V, and VOH undershoot >2V - all critical for mixed-voltage signal routing and bus isolation.

Technical Context

The SN74LVCZ240APWR implements eight high-speed CMOS buffers with Schmitt-trigger inputs and true 3-state outputs, partitioned into two functionally isolated banks (Bank 1: pins A1–A4/Y1–Y4; Bank 2: pins A5–A8/Y5–Y8), each controlled by its own active-low output enable (OE1/OE2). Its Ioff circuitry disables all outputs when VCC = 0V, enabling safe hot insertion.

It supports mixed-mode signal operation: inputs tolerate up to 5.5V regardless of VCC (2.7V–3.6V), allowing direct interfacing between 5V logic and 3.3V systems without level shifters. Output drive strength is symmetric (±24mA at 3V), with propagation delay tightly specified at 6.5ns (VCC = 3.3V) and robust ESD protection (±2000V HBM).

Key Specifications

Pinout & Package

PW package: 20-pin TSSOP (6.5mm × 6.4mm body, 0.65mm pitch), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APWR and 74LVC240ADB, the SN74LVCZ240APWR uniquely combines 5.5V input tolerance, Ioff, and power-up 3-state in a thermally efficient TSSOP package - making it the only option among the three qualified for mixed-voltage hot-swap and noise-sensitive industrial bus designs.

Availability

SN74LVCZ240APWR is available at Aetrix Electronics and suitable for industrial bus interface, hot-swappable module control, LED driver interface, signal integrity enhancement, and mixed-voltage logic translation requiring stable component supply and long-term lifecycle continuity.

Supply support for SN74LVCZ240APWR 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 over 50 years of innovation in high-reliability industrial and automotive electronics.

The SN74LVCZ240APWR belongs to TI's LVCZ advanced logic family, designed specifically for robust mixed-voltage signal routing, hot-plug-capable backplane interfaces, and noise-immune industrial control systems.

FAQ

What is the maximum input voltage the SN74LVCZ240APWR can accept?

The SN74LVCZ240APWR accepts input voltages up to 5.5V regardless of VCC level (2.7V–3.6V), enabling direct interfacing with 5V TTL or CMOS logic without external level shifters. This 5.5V tolerance is explicitly guaranteed in the Recommended Operating Conditions table and supported by internal clamp diode structure. The SN74LVCZ240APWR maintains full functionality and does not exceed absolute maximum ratings under this condition when input clamp current limits are observed.

Does the SN74LVCZ240APWR support hot insertion?

Yes, the SN74LVCZ240APWR supports hot insertion via two integrated features: Ioff circuitry that disables all outputs when VCC = 0V, and power-up 3-state that guarantees high-impedance outputs during power ramp-up. These functions prevent backfeeding and bus contention during live module replacement. The SN74LVCZ240APWR datasheet confirms both behaviors under "Features" and "Detailed Description", with Ioff leakage limited to ±5μA and power-up state validated across temperature and supply ramp rates.

What is the propagation delay of the SN74LVCZ240APWR at 3.3V?

The maximum propagation delay (tpd) of the SN74LVCZ240APWR is 6.5ns at VCC = 3.3V ±0.3V, as specified in the Switching Characteristics table. This value represents the worst-case delay from input transition (50% point) to output transition (50% point) under loaded conditions (CL = 50pF, RL = 500Ω). The SN74LVCZ240APWR achieves this performance with typical values lower (e.g., 1.3ns), making it suitable for sub-150MHz digital bus applications where timing predictability is critical.

How are the output enable pins configured on the SN74LVCZ240APWR?

The SN74LVCZ240APWR has two independent active-low output enable pins: OE1 (Pin 1) controls Bank 1 outputs (Y1–Y4), and OE2 (Pin 19) controls Bank 2 outputs (Y5–Y8). When either OE pin is low, its corresponding four outputs are enabled and follow their respective inputs; when high, those outputs enter high-impedance state. The SN74LVCZ240APWR allows granular bus segmentation - for example, enabling only one bank while holding the other in 3-state to isolate subsystems during reconfiguration.

What package type is used for the SN74LVCZ240APWR?

The SN74LVCZ240APWR uses the PW package: a 20-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm lead pitch, 6.5mm × 6.4mm overall dimensions, and 6.5mm × 4.4mm body size. It is RoHS-compliant, lead-free, and optimized for automated surface-mount assembly. Thermal resistance is RθJA = 120.3°C/W, requiring appropriate copper pour and via placement for thermal management in continuous operation. The SN74LVCZ240APWR part number suffix "PWR" explicitly denotes this TSSOP packaging variant.