Texas Instruments SN74LVCZ240APW

Overview

SN74LVCZ240APW 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 logic. It is used in mixed-voltage bus interfacing and LED drive circuits.

For engineers reviewing the SN74LVCZ240APW datasheet, SN74LVCZ240APW pinout, SN74LVCZ240APW application, or SN74LVCZ240APW equivalent, key selection factors include its dual-bank 3-state control, 5.5V input tolerance with 3.3V VCC, ground bounce <0.8V, VOH undershoot >2V, and TSSOP-20 package compatibility for space-constrained digital interface designs.

Technical Context

The SN74LVCZ240APW implements eight CMOS non-inverting buffers partitioned into two groups (Bank 1: pins A1–A4/Y1–Y4; Bank 2: pins A5–A8/Y5–Y8), each controlled by a dedicated active-low output enable (OE1/OE2). Its balanced push-pull outputs support ±24mA drive at 3V while maintaining TTL-compatible input thresholds and overvoltage-tolerant operation up to 5.5V on all I/O pins.

It integrates partial power-down (Ioff) functionality that disables outputs when VCC = 0V, and features power-up 3-state behavior ensuring high-impedance outputs during supply ramp-up. The device meets JESD78 latch-up immunity (>100mA) and supports mixed-mode signal translation between 5V logic sources and 3.3V system buses without level-shifting components.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5mm × 6.4mm body with 0.65mm pitch; thermally enhanced for surface-mount assembly in dense digital interfaces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APW and 74LVT240PW, the SN74LVCZ240APW uniquely combines 5.5V input tolerance, power-up 3-state, and Ioff in a single TSSOP-20 package-enabling safer, more flexible interface design in voltage-mixed and hot-plug systems without performance trade-offs.

Availability

SN74LVCZ240APW is available at Aetrix Electronics and suitable for industrial bus interface, LED driver circuit, hot-swappable module control, and legacy peripheral adapter applications requiring stable component supply and long-term production continuity.

Supply support for SN74LVCZ240APW 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 and embedded processing technologies, with leadership in logic, interface, and power management ICs for industrial, automotive, and communications markets.

The SN74LVCZ240APW belongs to TI's LVCZ advanced logic family, engineered for robust mixed-voltage interfacing in space-constrained, noise-sensitive digital systems where reliability under hot-swap and voltage transients is critical.

FAQ

What is the maximum input voltage rating for SN74LVCZ240APW?

The SN74LVCZ240APW supports an absolute maximum input voltage of 5.5V across all I/O pins, regardless of VCC level. This 5.5V tolerance enables direct connection to 5V logic sources while operating from a 2.7V–3.6V supply. Exceeding this rating risks permanent damage, as defined in the Absolute Maximum Ratings table of the official datasheet.

Does SN74LVCZ240APW support hot insertion?

Yes, SN74LVCZ240APW supports hot insertion through two integrated features: Ioff circuitry disables outputs when VCC = 0V, preventing backdrive current, and power-up 3-state ensures outputs remain high-impedance until VCC stabilizes. These functions eliminate bus contention and signal corruption during live module replacement in backplane or docking applications.

What is the function of the two OE pins on SN74LVCZ240APW?

SN74LVCZ240APW has two 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 an OE pin is low, its associated four outputs drive their inverted inputs; when high, those outputs enter high-impedance state. This dual-bank control enables selective bus gating in multi-peripheral systems.

Can SN74LVCZ240APW drive LEDs directly?

Yes, SN74LVCZ240APW can drive LEDs directly: each output sources or sinks up to ±24mA at 3V, sufficient for standard indicator LEDs with appropriate series resistors. Its 3-state capability also allows time-multiplexed LED matrix control. Ensure total output current remains within ±50mA per pin and ±100mA for VCC/GND combined, per Absolute Maximum Ratings.

What package type does SN74LVCZ240APW use?

SN74LVCZ240APW uses the TSSOP-20 (PW) package: a 6.5mm × 6.4mm surface-mount outline with 0.65mm lead pitch and exposed pad-less construction. It is distinct from SOIC-20 (DW) and SOP-20 (NS) variants - the "PW" suffix explicitly denotes this thin shrink small-outline package optimized for high-density PCB layouts.