STMicroelectronics M74HC280RM13TR

Overview

M74HC280RM13TR from STMicroelectronics is a high-speed CMOS 9-bit parity generator IC with SO14 package, operating from 2 V to 6 V supply, delivering 22 ns typical propagation delay at 6 V and supporting -55 °C to 125 °C industrial temperature range. It provides dual ΣODD/ΣEVEN outputs for real-time parity validation in data integrity circuits such as memory controllers and serial communication interfaces.

For engineers reviewing the M74HC280RM13TR datasheet, M74HC280RM13TR pinout, M74HC280RM13TR application, or M74HC280RM13TR equivalent, key selection criteria include its 9-input logic flexibility, symmetrical 4 mA output drive, low 4 μA quiescent current, and SO14 pin compatibility with legacy 74-series parity generators.

Technical Context

The M74HC280 implements combinational logic that counts high-level inputs across nine data lines (A–I) and asserts ΣODD when the count is odd, ΣEVEN when even - enabling hardware-level error detection without clocking or state storage. Its silicon gate C2MOS process ensures stable operation across full industrial voltage (2–6 V) and temperature (-55 °C to 125 °C) ranges.

All inputs feature integrated ESD protection (HBM: 2 kV, MM: 200 V, CDM: 1 kV), and outputs exhibit balanced |IOH| = IOL ≥ 4 mA drive capability with matched tPLH ≅ tPHL propagation delays. The NC pin (Pin 3) is unconnected and must remain floating per design specification.

Key Specifications

Pinout & Package

Package: SO14 (Small Outline, 14-pin, 3.9 mm width, ECOPACK® compliant). Body dimensions: 8.75 × 5.8 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit parity generator applications.

Compared with SN74HC280N and M74HC280TTR, the M74HC280RM13TR uniquely combines industrial temperature range (-55 °C to 125 °C), SO14 reflow compatibility, and tape-and-reel packaging - making it optimal for volume production in ruggedized embedded systems requiring long-term supply stability.

Availability

M74HC280RM13TR is available at Aetrix Electronics and suitable for memory subsystems, serial interface validation, industrial bus nodes, and test equipment requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for M74HC280RM13TR 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The M74HC280 belongs to ST's high-speed CMOS logic family, engineered specifically for reliable, low-power parity generation in mission-critical data path integrity applications across harsh environments.

FAQ

Can M74HC280RM13TR operate at 3.3 V supply?

Yes. The device is fully specified for VCC = 2 V to 6 V, including 3.3 V operation. At 3.3 V, VIH is guaranteed ≥ 2.31 V and VOL ≤ 0.4 V with 4 mA load, ensuring robust interfacing with 3.3 V microcontrollers and FPGAs without level shifters.

Is Pin 3 (NC) required to be grounded or left floating?

Pin 3 is explicitly designated "No Connection" in the datasheet and must remain unconnected - neither grounded nor tied to VCC. Internal circuitry has no bond wire or die connection to this pin; soldering or routing to it may cause mechanical stress or unintended coupling.

Does M74HC280RM13TR support cascading for >9-bit parity?

Yes. The datasheet confirms word-length expansion via cascading: ΣODD or ΣEVEN outputs from one device can serve as an input to another M74HC280, enabling 18-bit, 27-bit, or larger parity trees while preserving functional correctness and timing predictability.

What is the maximum capacitive load this IC can drive reliably?

With CL = 50 pF (per AC characterization), propagation delay remains within spec (tPLH/tPHL ≤ 49 ns at 6 V). For heavier loads, output transition time increases linearly - e.g., at 100 pF, tTLH/tTHL rises to ~38 ns (typ.) at 6 V, still within system timing budgets for ≤10 MHz applications.