STMicroelectronics M74HC173RM13TR

Overview

M74HC173RM13TR from STMicroelectronics is a high-speed CMOS quad D-type register with 3-state outputs, designed for synchronous data latching and bus isolation in digital systems. It features 4-bit storage, asynchronous active-high reset (CLEAR), dual low-active data enables (G1/G2), dual low-active output enables (M/N), and operates from 2V to 6V with f_MAX = 84 MHz (typ. at V_CC = 6V). Used in address/data bus registers and clock-synchronized I/O interfaces.

For engineers reviewing the M74HC173RM13TR datasheet, M74HC173RM13TR pinout, M74HC173RM13TR application, or M74HC173RM13TR equivalent, key selection criteria include 3-state output control timing (t_PZL/t_PLZ ≤ 30 ns at 6V), symmetrical drive strength (|I_OH|/I_OL ≥ 6 mA), noise immunity (V_NIH/V_NIL ≥ 28% V_CC), and TSSOP-16 package compatibility with space-constrained PCB layouts.

Technical Context

The M74HC173RM13TR implements four edge-triggered D-type flip-flops sharing a common positive-edge clock and asynchronous CLEAR, enabling simultaneous capture of 4-bit parallel data. Its dual-stage enable architecture separates data gating (G1/G2) from output tri-state control (M/N), supporting independent data latching and bus release timing.

All inputs include ESD protection diodes; propagation delays are balanced (t_PLH ≅ t_PHL), and output transition times remain consistent across V_CC = 2–6V, ensuring predictable timing in mixed-voltage logic systems.

Key Specifications

Pinout & Package

TSSOP-16 package (4.9 × 6.4 mm body, 0.65 mm pitch), thermally enhanced for surface-mount assembly in compact digital logic modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad D-type register with 3-state output applications.

Compared with SN74HC173PWR and 74VHC173M, the M74HC173RM13TR uniquely supports 6 V operation and –55°C minimum temperature, making it optimal for industrial sensors and legacy 5 V backplanes where overvoltage tolerance and extreme cold startup are critical.

Availability

M74HC173RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment digital pattern generation, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC173RM13TR 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 microcontrollers, power management, analog ICs, and automotive-grade silicon.

The M74HC173RM13TR belongs to ST's high-speed HC logic family, engineered for reliable interoperability with legacy TTL and modern CMOS systems in harsh industrial and automotive environments.

FAQ

What is the maximum clock frequency supported by the M74HC173RM13TR?

The M74HC173RM13TR achieves a typical maximum clock frequency of 84 MHz at V_CC = 6 V with C_L = 50 pF. At 4.5 V, f_MAX drops to 67 MHz (typ.), and at 2 V it is 20 MHz (typ.). These values are measured under defined AC test conditions and assume proper PCB layout with minimized trace inductance and adequate power supply decoupling.

How does the dual output enable (M and N) function in practice?

Both M and N must be driven low simultaneously to activate the 3-state outputs (Q1–Q4); if either is high, all outputs enter high-impedance mode. This dual-input design prevents accidental bus contention during power-up or reset sequencing, as it requires explicit assertion of two control signals rather than relying on a single enable line.

Can the M74HC173RM13TR operate reliably at –55°C?

Yes - the device is fully characterized and guaranteed to operate from –55°C to +125°C per its Recommended Operating Conditions table. All DC and AC parameters, including propagation delay, output drive, and noise immunity, are specified across this full range, making it suitable for aerospace, downhole, and polar-environment applications.

Is there a risk of bus contention when using the CLEAR and output enables together?

No - CLEAR is asynchronous and forces Q outputs low regardless of clock or enable states, but it does not override the 3-state control. When M or N is high, Q outputs remain high-impedance even during CLEAR assertion. This ensures safe bus release during reset, preventing conflict with other devices sharing the same data lines.