NXP Semiconductors 74LVT573PW,112

Overview

74LVT573PW,112 from Nexperia is an 8-bit 3.3 V D-type transparent latch with 3-state outputs, latch enable (LE) and output enable (OE) controls, bus-hold inputs, and overvoltage-tolerant inputs up to 5.5 V. It operates from 2.7 V to 3.6 V, supports -40 °C to +85 °C ambient range, and delivers sub-5 ns propagation delay (Dn→Qn at 3.3 V), enabling reliable data latching in high-speed microprocessor bus interfaces.

For engineers reviewing the 74LVT573PW,112 datasheet, 74LVT573PW,112 pinout, 74LVT573PW,112 application, or 74LVT573PW,112 equivalent, key selection considerations include its 3-state bus-driving capability, latch transparency behavior under LE HIGH, power-up 3-state safety, IOFF partial power-down support, and compatibility with both 3.3 V logic and 5 V-tolerant system buses.

Technical Context

The device implements eight independent D-type latches with shared LE and OE controls. When LE is HIGH, Qn follows Dn in real time (transparent mode); when LE transitions LOW, the input state is captured and held. OE operates independently-asserting OE LOW places all outputs in high-impedance state without affecting latch contents.

Bus-hold circuitry on all Dn inputs eliminates external pull-ups for unused lines, while IOFF protection prevents current flow during power-down. Overvoltage tolerance (up to 5.5 V) enables safe interfacing with 5 V systems, and BiCMOS construction ensures TTL-compatible drive strength with low power consumption.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC573APWR and 74ALVC573PW,118, the 74LVT573PW,112 uniquely combines 5.5 V input tolerance, integrated bus-hold, and IOFF protection-making it optimal for rugged industrial bus interfaces where reliability under undefined conditions is mandatory.

Availability

74LVT573PW,112 is available at Aetrix Electronics and suitable for industrial PLCs, test equipment, memory subsystems, and microprocessor bus expansion requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.

Supply support for 74LVT573PW,112 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality standards.

The 74LVT family targets high-speed, 3.3 V bus interface applications requiring robust noise immunity, mixed-voltage compatibility, and industrial temperature operation-designed specifically for system-level signal integrity in demanding embedded environments.

FAQ

What is the function of the LE and OE pins, and how do they interact?

LE (latch enable) controls data capture: when HIGH, Qn follows Dn (transparent mode); on HIGH-to-LOW transition, current Dn values are latched. OE (output enable) controls output state independently: LOW disables all Qn outputs into high-impedance, regardless of LE or latch content. This separation allows data to be held while outputs are isolated-critical for bus arbitration and hot-swap.

Does the 74LVT573PW,112 require external pull-up resistors on unused D inputs?

No. The device integrates bus-hold circuitry on all D0–D7 inputs, providing ±75–150 μA active feedback that maintains the last-valid logic state without external components. This eliminates BOM items, reduces layout complexity, and prevents floating-input-induced noise or oscillation in partially used configurations.

Can the 74LVT573PW,112 safely interface with a 5 V microcontroller bus?

Yes. All inputs (Dn, LE, OE) are overvoltage tolerant up to 5.5 V-even when VCC = 3.3 V-enabling direct connection to 5 V logic without level shifters. Outputs are 3.3 V CMOS compatible but may require external pull-ups or translators if driving 5 V TTL inputs expecting >2.0 V VIH; consult load-specific VIH requirements.

What happens to outputs during power-up or power-down sequences?

At power-up, outputs default to 3-state (high-impedance) and latches retain their last state-preventing bus contention. During power-down, IOFF circuitry blocks current flow between powered and unpowered sections, eliminating back-drive risk. These features ensure safe operation in systems with staggered power sequencing or hot-pluggable modules.