NXP 74LVC573APW: A Comprehensive Technical Overview of the Octal D-Type Latch with 3-State Outputs

The NXP 74LVC573APW is a high-performance, low-voltage octal D-type latch designed for a wide range of digital logic applications. Fabricated with advanced CMOS technology, this integrated circuit is a fundamental building block in bus-oriented systems where data retention and output control are paramount.

This device features eight D-type latches with 3-state outputs unified under a common latch enable (LE) and output enable (OE) control. When the LE input is held high, the Q outputs follow the data (D) inputs transparently. A high-to-low transition on LE latches and stores the data at that instant. The critical output enable (OE) input, when driven high, places all eight outputs into a high-impedance state (Hi-Z). This 3-state functionality is essential for preventing bus contention in multi-master systems, such as microprocessors, where multiple devices share a common data bus.

A key advantage of the 74LVC family is its wide supply voltage range from 1.65 V to 3.6 V. This makes it exceptionally versatile, allowing seamless interfacing between devices operating at 3.3 V and lower voltage nodes like 2.5 V or 1.8 V, a common requirement in modern mixed-voltage designs. Despite its low-power consumption, it offers high noise immunity and can sustain speeds up to 150 MHz, supporting rapid data transfer.

The 74LVC573APW is housed in a TSSOP-20 (Thin Shrink Small Outline Package), which is ideal for space-constrained PCB designs. It also incorporates robust ESD protection (exceeding 2000 V per HBM), ensuring reliability in demanding industrial and automotive environments. Inputs can tolerate voltages up to 5.5 V, making it safe for interfacing with higher voltage systems even when its own VCC is as low as 1.65 V.

ICGOODFIND: The NXP 74LVC573APW stands out as an exceptionally robust and versatile octal latch. Its combination of low-voltage operation, high-speed performance, 3-state output control, and superior noise immunity makes it an indispensable component for modern digital design, particularly in bus interface and data storage applications.

Keywords: 3-State Outputs, Octal D-Type Latch, Low-Voltage CMOS (LVC), Bus Interface, Output Enable (OE).