NXP Semiconductors 74LVT573D,112

Overview

74LVT573D,112 from Nexperia is a 3.3 V octal D-type transparent latch with 3-state outputs, designed for bus interfacing in high-speed digital systems. It features independent latch enable (LE, active HIGH) and output enable (OE, active LOW), bus hold inputs eliminating external pull-ups, and overvoltage-tolerant inputs up to 5.5 V - enabling direct interface with 5 V logic buses in mixed-voltage microprocessor data paths.

For engineers reviewing the 74LVT573D,112 datasheet, 74LVT573D,112 pinout, 74LVT573D,112 application, or 74LVT573D,112 equivalent, key selection criteria include propagation delay (≤5.6 ns LE→Qn at 3.6 V), 3-state timing (tPZH ≤5.1 ns), bus hold current (±75–150 μA), IOFF power-down capability, and SO20 package compatibility with legacy PCB footprints.

Technical Context

The 74LVT573D implements eight independent D-type latches with synchronous transparency controlled by LE: when LE is HIGH, Qn follows Dn in real time; when LE goes LOW, data is latched and held. OE operates independently to place all outputs in high-impedance state without affecting latch contents.

Its BiCMOS process delivers TTL-compatible input thresholds (VIH ≥2.0 V, VIL ≤0.8 V), 5.5 V overvoltage-tolerant inputs, and robust bus hold circuitry (IBHL/IBHH ±75–150 μA at 3 V), enabling stable operation on unterminated or lightly loaded 3.3 V/5 V buses without external biasing.

Key Specifications

Pinout & Package

74LVT573D,112 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch - compatible with automated SMT placement and reflow profiles per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC573APWR and 74ALVC573PW, the 74LVT573D,112 uniquely combines 5.5 V input tolerance, integrated bus hold, and 64 mA sink drive - making it the only option among the three that supports robust 3.3 V/5 V mixed-signal bus interfacing without external components or timing compromises.

Availability

74LVT573D,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microprocessor data bus interfacing, memory-mapped peripheral design, and hot-swappable backplane modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT573D,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 discrete devices - with leadership in automotive-grade and industrial-standard components.

The 74LVT573 belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered specifically for high-speed, mixed-voltage digital interfacing in industrial control, communications infrastructure, and embedded computing applications.

FAQ

Can 74LVT573D,112 safely interface with a 5 V microcontroller's data bus?

Yes - its inputs are overvoltage tolerant up to 5.5 V regardless of VCC (2.7–3.6 V), and its output levels meet TTL specifications (VOH ≥2.0 V, VOL ≤0.55 V at 3.0 V). No level shifter is required, but VCC must remain within 2.7–3.6 V. Outputs drive 5 V buses directly only in HIGH/LOW states; high-Z state remains referenced to VCC.

What is the purpose of the bus hold feature, and how does it affect unused inputs?

The bus hold circuitry actively maintains the last-valid logic state on each D input using ±75–150 μA feedback current - preventing floating inputs from oscillating or drifting due to noise. This eliminates the need for external pull-up/down resistors on unconnected D0–D7 pins, reducing BOM cost and improving noise immunity in industrial environments.

Does 74LVT573D,112 support hot-swap or live insertion?

Yes - it supports live insertion and extraction per datasheet Section 2. The combination of IOFF circuitry (blocking current when VCC = 0 V), overvoltage-tolerant inputs, and controlled 3-state outputs ensures no bus contention, latch corruption, or damage during hot-plug events in modular backplane systems.

How does the latch enable (LE) and output enable (OE) interact during operation?

LE and OE operate independently: LE controls data capture (HIGH = transparent, LOW edge = latch), while OE controls output driver state (LOW = active, HIGH = high-Z). OE assertion does not alter latch contents - stored data remains intact and ready for re-output when OE is reasserted, enabling flexible bus arbitration and power management.