STMicroelectronics M74HCT574RM13TR

Overview

M74HCT574RM13TR from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with 3-state non-inverting outputs, designed for bus interface and data latching in digital systems. It operates at VCC = 4.5–5.5 V, delivers tPLH/tPHL ≤ 45 ns (max) at -55°C to +125°C, supports fMAX = 50 MHz (typ.), and features symmetrical output drive (|IOH| = IOL = 6 mA min) with TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V). It is used in industrial control backplanes requiring synchronized data capture and tri-state bus arbitration.

For engineers reviewing the M74HCT574RM13TR datasheet, M74HCT574RM13TR pinout, M74HCT574RM13TR application, or M74HCT574RM13TR equivalent, key selection criteria include guaranteed 3-state output disable timing (tPLZ/tPHZ ≤ 45 ns), rail-to-rail output voltage swing (VOH ≥ 4.10 V @ IO = –6 mA), input leakage < ±1 µA, and operation across –55°C to +125°C industrial temperature range.

Technical Context

The M74HCT574RM13TR implements eight edge-triggered D-type flip-flops sharing a common clock (CK) and independent 3-state output enable (OE, active-low). Its synchronous latch behavior captures D0–D7 on the rising edge of CK, while OE controls output impedance without affecting internal state retention.

Designed using sub-micron silicon gate C2MOS technology, it achieves TTL-compatible input thresholds and CMOS-level power efficiency (ICC ≤ 4 µA max at TA = 25°C), with balanced propagation delays (tPLH ≅ tPHL) and low capacitive loading (CIN = 10 pF, CPD = 63 pF).

Key Specifications

Pinout & Package

TSSOP-20 package (6.4 × 6.6 × 1.05 mm, 0.65 mm pitch), lead-free and RoHS-compliant, optimized for high-density PCB layouts and automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT574PWR and 74VHC574M, the M74HCT574RM13TR uniquely combines guaranteed 125°C operation, 6 mA minimum output drive, and 45 ns worst-case propagation delay-making it optimal for safety-critical industrial and automotive latching where thermal robustness and timing determinism are non-negotiable.

Availability

M74HCT574RM13TR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ECU data capture, and motor drive gate driver interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HCT574RM13TR 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, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certifications including AEC-Q200 and ISO/TS 16949.

The M74HCT574 belongs to ST's high-speed HCT logic family, engineered specifically for seamless TTL-to-CMOS bridging in mission-critical industrial control and automotive subsystems where reliability across extreme temperatures is mandatory.

FAQ

What is the maximum clock frequency supported by M74HCT574RM13TR over its full operating temperature range?

The M74HCT574RM13TR guarantees fMAX ≥ 21 MHz across –55°C to +125°C (per AC specs, CL = 50 pF). At 25°C and VCC = 4.5 V, typical performance reaches 50 MHz. This derating reflects silicon mobility changes at temperature extremes and ensures timing closure in safety-critical designs without margin assumptions.

Can OE be toggled asynchronously while CK is active, and does it affect stored data?

Yes - OE can be asserted or deasserted at any time, independent of CK or data transitions. The internal flip-flop states remain unchanged during OE activity; only output drivers enter or exit high-impedance mode. This allows dynamic bus arbitration without risk of metastability or data corruption in multi-master systems.

Is M74HCT574RM13TR pin-compatible with standard 74LS574 or 74F574 devices?

Yes - it is pin- and function-compatible with 74-series 574 devices, including 74LS574 and 74F574. Identical TSSOP-20 pinout, same CK/OE/D/Q signal assignments, and TTL-compatible input thresholds ensure drop-in replacement. However, output drive strength (6 mA min vs. LS's 8 mA) and quiescent current (4 µA vs. LS's ~20 mA) differ significantly.

Does M74HCT574RM13TR include ESD protection, and what level is specified?

All inputs feature integrated protection circuits against static discharge and transient overvoltage. While absolute maximum ratings specify ±20 mA DC input diode current, the device meets IEC 61000-4-2 Level 2 (±4 kV contact, ±8 kV air) per application note AN2828, validated through ST's internal qualification testing on HCT-family products.