STMicroelectronics M74HC573M1R

Overview

M74HC573M1R from STMicroelectronics is a high-speed CMOS octal D-type transparent latch with 3-state non-inverting outputs in SO-20 package, operating from 2V to 6V supply, delivering 13ns typical propagation delay (VCC = 6V), ±6mA output drive, and 4µA max quiescent current at 25°C - used for bidirectional bus buffering and data latching in industrial control I/O modules.

For engineers reviewing the M74HC573M1R datasheet, M74HC573M1R pinout, M74HC573M1R application, or M74HC573M1R equivalent, key selection considerations include latch enable (LE) and output enable (OE) timing margins, 3-state output leakage (<5µA), symmetrical tPLH/tPHL balance, and compatibility with 74-series bus architectures.

Technical Context

The M74HC573 implements an 8-bit transparent latch architecture where Q outputs follow D inputs when LE is HIGH, and hold the last D state when LE transitions LOW. Its dual-control interface (LE for data capture, OE for output tri-state) enables precise bus arbitration in shared-data-path systems.

Designed using silicon gate C2MOS technology, it features input protection against ESD and transient overvoltage, rail-to-rail input voltage tolerance (0–VCC), and guaranteed operation across –55°C to +125°C with full DC/AC specifications validated at VCC = 2V, 4.5V, and 6V.

Key Specifications

Pinout & Package

SO-20 (Small Outline, 20-pin, 300 mil width) package per mechanical drawing PO13L; 1.27 mm pitch; gull-wing leads; RoHS-compliant matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC573N and 74LVC573APW, M74HC573M1R uniquely supports 2–6V operation, extended temperature range (–55°C to +125°C), and SO-20 packaging - making it the only option for ruggedized, mixed-voltage, surface-mount industrial control applications.

Availability

M74HC573M1R is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical diagnostic data acquisition requiring stable component supply across long product lifecycles.

Supply support for M74HC573M1R 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

M74HC573 belongs to ST's high-speed HC logic family - engineered for interoperability with legacy TTL systems while delivering CMOS power efficiency and enhanced noise immunity in harsh electromagnetic environments.

FAQ

What is the maximum clock frequency supported by M74HC573M1R?

M74HC573M1R is not a clocked register but a transparent latch controlled by LE and OE. Its usable data rate depends on propagation delay (13ns typ. at 6V) and minimum pulse width (7ns typ.), supporting reliable operation up to ~30 MHz in latch-based bus systems when timing margins are properly designed.

Can M74HC573M1R drive LEDs directly?

No - its 6mA output drive is insufficient for standard indicator LEDs (typically requiring 10–20mA). It can drive high-efficiency LEDs at reduced brightness or serve as a logic-level translator to a dedicated LED driver like ULN2003, but direct LED sinking is outside absolute maximum ratings.

Is M74HC573M1R pin-compatible with 74LS573 in SO-20?

Yes - M74HC573M1R uses identical SO-20 pinout and logic function as 74LS573, including LE, OE, D0–D7, and Q0–Q7 assignments. However, voltage thresholds differ: HC logic requires VIH ≥ 3.15V at 4.5V VCC versus LS's 2.0V, so level-shifting may be needed in mixed-technology systems.

Does M74HC573M1R require external pull-up resistors on Q outputs?

No - Q outputs are actively driven high/low or placed in high-impedance state via OE. Pull-ups are unnecessary unless interfacing with open-drain systems or implementing wired-OR logic, which is not the intended use case for this non-inverting 3-state latch.