NXP Semiconductors 74LVT573BQ,115

Overview

74LVT573BQ,115 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-6 ns LE-to-Q propagation delay at 3.3 V - used for data latching and bus isolation in high-speed microprocessor interface circuits.

For engineers reviewing the 74LVT573BQ,115 datasheet, 74LVT573BQ,115 pinout, 74LVT573BQ,115 application, or 74LVT573BQ,115 equivalent, key selection criteria include 3-state timing margins, bus-hold current specs (±75–150 µA), IOFF power-down leakage (<100 µA), and DHVQFN20 thermal performance in space-constrained logic interfaces.

Technical Context

This device implements eight independent D-type latches with shared LE and OE controls. Latch transparency occurs when LE is HIGH; data is captured on LE HIGH-to-LOW transition. OE independently places all Q outputs into high-impedance state without affecting internal latch states.

Bus-hold circuitry actively maintains unused D-input logic levels without external pull-ups. IOFF protection disables output leakage during partial power-down (VCC = 0 V), and overvoltage-tolerant inputs allow safe interfacing to 5 V buses while operating at 3.3 V supply.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, no leads, thermally enhanced bottom pad, 20-terminal quad flat layout with terminal 1 index area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC573APWR, the 74LVT573BQ,115 provides guaranteed bus-hold and tighter LE→Q timing (5.6 ns vs 6.7 ns max), while 74ALVC573PW,118 offers identical functionality with marginally higher static power - making the 74LVT573BQ,115 optimal for low-noise, high-reliability industrial bus interfaces.

Availability

74LVT573BQ,115 is available at Aetrix Electronics and suitable for industrial PLCs, microprocessor bus expansion, memory-mapped peripheral control, and legacy 5 V system integration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT573BQ,115 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 for automotive, industrial, and consumer markets.

The 74LVT family targets high-speed 3.3 V logic interfacing with emphasis on bus-hold, IOFF, and mixed-voltage compatibility - designed specifically for robustness in industrial control and communication infrastructure.

FAQ

What is the maximum clock frequency supported by the 74LVT573BQ,115?

The 74LVT573BQ,115 is not a clocked register but a transparent latch controlled by LE. Its usable data rate depends on LE pulse width (min 3.3 ns) and propagation delays (LE→Q ≤5.6 ns). In practice, it supports reliable operation in systems with bus cycles down to ~10 ns, enabling use with 100 MHz microprocessor buses where LE is strobed per transaction.

Can the 74LVT573BQ,115 be used with a 5 V microcontroller?

Yes - its inputs tolerate up to 5.5 V regardless of VCC (2.7–3.6 V), allowing direct connection to 5 V microcontroller outputs. However, outputs swing only to VCC (max 3.6 V), so interfacing to 5 V inputs requires either 5 V-tolerant receivers or a level shifter for HIGH-level recognition.

Is the thermal pad on the DHVQFN20 package required to be soldered?

No - the exposed pad (terminal 1 index area) has no electrical function. Per Nexperia's datasheet, it may remain unsoldered, or if soldered, must be left electrically floating or connected to GND. Thermal performance improves with GND connection, but mechanical reliability is maintained without soldering.

Does the bus-hold feature affect timing or power consumption?

Bus-hold adds ±75–150 µA DC current when inputs float near switching thresholds but introduces negligible delay (<0.2 ns) and no additional timing skew. Power impact is minimal: at 3.3 V, worst-case added static current is ~1.2 mW per held input - insignificant compared to dynamic switching power in typical applications.