NXP Semiconductors 74LVC573ABXX

Overview

74LVC573ABXX from NXP Semiconductors is an octal transparent D-type latch with 3-state outputs, operating from 1.65 V to 3.6 V supply, featuring 4.8 ns propagation delay at 3.3 V and ±24 mA output drive capability. It serves as a data latching interface in bus-hold applications for microcontroller peripheral expansion and FPGA I/O buffering.

For engineers reviewing the 74LVC573ABXX datasheet, 74LVC573ABXX pinout, 74LVC573ABXX application, or 74LVC573ABXX equivalent, key selection criteria include supply voltage range compatibility, output drive strength for TTL/CMOS bus loading, propagation delay budget in synchronous latch paths, and 3-state control timing margins.

Technical Context

This latch uses CMOS technology with Schmitt-trigger inputs on the enable (OE) and latch-enable (LE) pins to suppress noise-induced transitions. Its 3-state outputs are independently controlled by OE, allowing bidirectional bus sharing without external direction logic.

The device implements true transparent latching: when LE is high, Q follows D; when LE falls, Q holds the last D value. Output leakage current is ≤±10 µA at 3.6 V, supporting low-power standby modes in portable systems.

Key Specifications

Pinout & Package

Available in SO20 (Small Outline 20-pin) package with 0.65 mm pitch, JEDEC MS-013AC compliant, body size 12.8 mm × 7.5 mm × 2.35 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC573APWR, the 74LVC573ABXX offers identical timing and drive but superior thermal performance in reflow profiles due to SO20's larger copper pad area; versus 74LVCH16373ADGG, it provides lower BOM cost and simpler routing for single-bus applications.

Availability

74LVC573ABXX is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, FPGA-based test equipment, and microcontroller-based IoT gateways requiring stable component supply across multi-year production cycles.

Supply support for 74LVC573ABXX 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with headquarters in Eindhoven, Netherlands.

The 74LVC logic family targets low-voltage, high-speed digital interfacing in mixed-signal systems where power efficiency, noise immunity, and bus integrity are critical design constraints.

FAQ

What is the maximum clock frequency supported by the 74LVC573ABXX?

The 74LVC573ABXX is not a clocked register but a transparent latch: its effective maximum data rate depends on the LE signal timing. With 4.8 ns propagation delay and minimum LE pulse width of 3.5 ns, it supports reliable latching of data edges up to 125 MHz in systems where LE is derived from a clean, jitter-free source.

Does the 74LVC573ABXX require external pull-up resistors on its inputs?

No. The device integrates bus-hold circuitry on all inputs (D and control pins), providing approximately 100 kΩ weak pull-up or pull-down to maintain valid logic states when inputs are floating. External resistors are unnecessary unless specific biasing for test access or special noise conditions is required.

Can the 74LVC573ABXX be used with a 5 V microcontroller interface?

No. Its absolute maximum input voltage is V_CC + 0.5 V, and it is not 5 V tolerant. Direct connection to 5 V logic will damage the inputs. A level-shifting solution such as the NXP NXSL1T45 or discrete resistor divider is required for interoperability with 5 V systems.

How does the IOFF feature protect the device during partial power-down?

When V_CC = 0 V, the IOFF circuit disables all input buffers, blocking current flow from powered inputs into the unpowered V_CC rail. This prevents back-powering and potential latch-up in systems where some ICs remain active while others are powered down, such as hot-swap backplanes or modular power domains.