STMicroelectronics M74HC533RM13TR

Overview

M74HC533RM13TR from STMicroelectronics is a high-speed CMOS octal D-type latch with 3-state inverting outputs, designed for bus-oriented data latching and isolation in digital systems. It features 8-bit transparent latching controlled by LE, 3-state output enable (OE), propagation delay of 12 ns (typ. at VCC = 6 V), symmetrical output drive (±6 mA), and operates across 2 V to 6 V. Used in microcontroller address/data bus buffering and memory interface control.

For engineers reviewing the M74HC533RM13TR datasheet, M74HC533RM13TR pinout, M74HC533RM13TR application, or M74HC533RM13TR equivalent, key selection criteria include latch enable timing (tW(H) = 6 ns min at 6 V), 3-state disable/enable delays (tPLZ/tPZH ≤ 13 ns), input noise immunity (VNIH/VNIL = 28% VCC min), and TSSOP-20 package compatibility with space-constrained PCB layouts.

Technical Context

The M74HC533RM13TR implements an 8-bit edge-triggered latch architecture where Q outputs follow D inputs when LE is high, and hold the last D state when LE transitions low. Its 3-state outputs are independently controlled by active-low OE, enabling bidirectional bus sharing without external logic.

All inputs include silicon-gate C2MOS ESD protection, and output impedance is balanced (|IOH| = IOL ≥ 6 mA), ensuring matched rise/fall times (tPLH ≅ tPHL) and minimizing bus skew in multi-device configurations.

Key Specifications

Pinout & Package

TSSOP-20 package: 4.4 mm × 6.5 mm body, 0.65 mm pitch, thin-profile surface-mount outline optimized for automated assembly and thermal performance in dense layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC573PW and 74LVC573APW, the M74HC533RM13TR uniquely delivers inverting 3-state outputs with 5 V tolerance and superior noise immunity-critical for mixed-voltage industrial backplanes where signal integrity under EMI stress is non-negotiable.

Availability

M74HC533RM13TR is available at Aetrix Electronics and suitable for microcontroller bus interfaces, memory address latching, and industrial I/O expansion requiring stable component supply across extended temperature ranges (-55°C to +125°C).

Supply support for M74HC533RM13TR 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 scale and AEC-Q100 qualification capabilities.

The M74HC533 belongs to ST's high-speed HC logic family, engineered for pin-compatible replacement of legacy 74-series devices while delivering improved speed, noise immunity, and power efficiency in industrial control and instrumentation systems.

FAQ

What is the maximum operating frequency supported by M74HC533RM13TR?

The device does not specify a maximum clock frequency, but its typical propagation delay of 12 ns at 6 V implies reliable operation up to approximately 35 MHz in latch-enable-controlled systems. Actual usable frequency depends on board layout, load capacitance, and setup/hold timing margins - measured tW(H) minimum is 6 ns at 6 V, defining the shortest LE pulse width for guaranteed capture.

Can M74HC533RM13TR operate at 3.3 V with guaranteed performance?

Yes - the recommended VCC range includes 3.3 V, and all DC/AC specifications are fully characterized from -55°C to +125°C at that voltage. At 3.3 V, tPD increases to 25 ns (typ.), IOL/IOH drops to ≥4 mA, and VIH/VIL thresholds scale proportionally (VIH = 2.31 V min), maintaining full logic compatibility with 3.3 V microcontrollers and FPGAs.

Is the output inversion applied before or after the 3-state control?

Inversion occurs in the output buffer stage and is independent of OE state - when OE = L, Qn outputs present the logical inverse of the latched Dn value; when OE = H, all Qn terminals enter high-impedance regardless of latch state. This preserves signal polarity integrity during bus release.

Does M74HC533RM13TR support hot insertion or live bus swapping?

No - the device lacks explicit hot-swap protection circuitry such as power-up 3-state or undervoltage lockout. While its input clamps and high-impedance outputs reduce risk, safe hot insertion requires external series resistors and sequencing controls per IEC 61000-4-2 guidelines; ST recommends powering VCC and GND before applying input signals.