STMicroelectronics M74HC573RM13TR

Overview

M74HC573RM13TR from STMicroelectronics is a high-speed CMOS octal D-type transparent latch with 3-state non-inverting outputs, fabricated in silicon gate C2MOS technology. It features latch enable (LE) and output enable (OE) controls, 2V–6V supply operation, 13ns typical propagation delay at 6V, ±6mA output drive, and high noise immunity (28% VCC). It serves as a bidirectional bus interface latch in microcontroller peripheral expansion systems.

For engineers reviewing the M74HC573RM13TR datasheet, M74HC573RM13TR pinout, M74HC573RM13TR application, or M74HC573RM13TR equivalent, key selection criteria include 3-state bus driving capability, latch timing margins (tPLH/tPHL ≈ 20ns max at 4.5V), input setup/hold requirements (ts = 10ns min, th = 5ns min), and TSSOP-20 package thermal and routing constraints.

Technical Context

The M74HC573RM13TR 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 logic (LE for data capture, OE for output tri-state) enables precise bus arbitration in shared-data-path systems.

It operates across industrial temperature (−55°C to +125°C) and supports wide VCC range (2V–6V), ensuring compatibility with mixed-voltage logic domains. Input thresholds are rail-proportional (VIH = 3.15V @ 4.5V, VIL = 1.35V @ 4.5V), and output drive strength is symmetrical (|IOH| = IOL = 6mA min at 4.5V).

Key Specifications

Pinout & Package

Package: TSSOP-20 (6.5mm × 4.4mm, 0.65mm pitch), JEDEC MO-153 compliant, surface-mount, lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal latch with 3-state output applications.

Compared with SN74HC573PWR and 74VHC573FT, the M74HC573RM13TR delivers superior thermal resilience (−55°C to +125°C), tighter input capacitance (5pF), and proven reliability in long-life industrial deployments-making it optimal for mission-critical infrastructure where lifetime stability outweighs marginal speed gains.

Availability

M74HC573RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, medical diagnostic backplanes, and automotive body control modules requiring stable component supply over 15+ year product lifecycles.

Supply support for M74HC573RM13TR 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 industrial, automotive, and consumer markets.

The M74HC573 belongs to ST's high-speed CMOS logic family, engineered for low-power, noise-immune bus interfacing in harsh-environment embedded systems where reliability and long-term supply stability are mandatory.

FAQ

What is the maximum operating frequency supported by M74HC573RM13TR?

The M74HC573RM13TR does not specify a maximum clock frequency, as it is a transparent latch-not a clocked register. Its usable data rate depends on propagation delay (tPD = 13ns typ. @ 6V) and setup/hold timing (ts = 10ns min, th = 5ns min). In practice, it reliably supports bus toggle rates up to 30 MHz when used with clean LE control edges and proper PCB layout.

Can M74HC573RM13TR drive LED indicators directly?

Yes-each output can source or sink up to 6mA (min) at 4.5V, sufficient to drive standard 2mA–5mA indicator LEDs with appropriate series resistors. For example, at 5V VCC and 2mA LED current, a 1.5kΩ resistor limits current safely. Avoid simultaneous full-load drive on all eight outputs due to total ICC derating above 85°C.

Is M74HC573RM13TR pin-compatible with 74LS573 in TSSOP-20?

Yes-M74HC573RM13TR uses the same TSSOP-20 pinout and logic function as the 74LS573, including identical OE, LE, D0–D7, and Q0–Q7 assignments. However, voltage levels differ: HC logic accepts 3.15V VIH at 4.5V VCC versus LS's 2.0V, so direct substitution requires verifying driver compatibility with HC input thresholds.

Does M74HC573RM13TR require external pull-up or pull-down resistors on OE or LE?

No-OE and LE are CMOS inputs with negligible leakage (±0.1µA max), so they may float only if actively driven by another device. In unconnected states, floating LE risks unintended latching; floating OE risks undefined output states. Best practice is to tie OE to GND (enabled) or VCC (tri-stated) and LE to VCC (transparent) or controlled by MCU GPIO-no pull resistors needed unless signal integrity demands termination.