STMicroelectronics M74HC259RM13TR

Overview

M74HC259RM13TR from STMicroelectronics is a high-speed CMOS 8-bit addressable latch with active-low enable, 3-bit address decoding (A/B/C), single data input (D), and conditional clear (CLR). It operates from 2 V to 6 V, delivers 20 ns typical propagation delay at 6 V, supports ±4 mA output drive, and features symmetrical tPLH/tPHL timing. Used in industrial I/O expansion and memory-mapped peripheral control where selective bit latching is required.

For engineers reviewing the M74HC259RM13TR datasheet, M74HC259RM13TR pinout, M74HC259RM13TR application, or M74HC259RM13TR equivalent, key selection criteria include its SO16 automotive-grade package (-55 °C to +125 °C), addressable latch vs. 3-to-8 decoder dual-mode operation, CLEAR/ENABLE interaction logic, and HC-series compatibility with legacy 74259 designs.

Technical Context

The M74HC259 implements an address-selectable storage architecture: when ENABLE is low, the 3-bit address selects one of eight Q outputs to latch the D input level on the rising edge of ENABLE; all unselected outputs retain prior state. Its internal logic combines address decoding and edge-triggered latch functionality in a single monolithic structure.

It supports three functional modes: (1) addressable latch (ENABLE low, CLEAR high), (2) 3-to-8 line demultiplexer (ENABLE low, CLEAR low), and (3) global clear (ENABLE high, CLEAR low). Input protection includes CDM 1 kV, HBM 1.5 kV, and MM 200 V ESD ratings per JEDEC standards.

Key Specifications

Pinout & Package

Supplied in a 16-pin plastic small-outline (SO16) package per ECOPACK® environmental compliance standards. Dimensions: 10.0 mm × 6.0 mm × 1.75 mm body height, 1.27 mm lead pitch, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar addressable latch applications.

Compared with SN74HC259N and 74AHC259PW, M74HC259RM13TR uniquely combines extended temperature range, automotive qualification, and SO16 manufacturability-making it optimal for industrial control and automotive body electronics where reliability across thermal extremes is mandatory.

Availability

M74HC259RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment signal routing, and medical diagnostic instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC259RM13TR 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 microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

M74HC259RM13TR belongs to ST's high-speed CMOS logic family, engineered specifically for robust, low-power, pin-compatible upgrades to legacy 74-series logic in harsh-environment applications.

FAQ

What is the function of the CLEAR input when ENABLE is low?

When ENABLE is low and CLEAR is low, the device operates as a 3-to-8 line demultiplexer: the addressed output (Q0–Q7) follows the D input, while all unaddressed outputs are forced low. This mode enables simultaneous data distribution and selective output activation without external gating logic.

Can M74HC259RM13TR operate reliably at 2.0 V supply?

Yes - the device is fully specified down to 2.0 V VCC, with guaranteed VIH = 0.5 V, VOL ≤ 0.1 V at 20 µA, and tPD ≤ 210 ns (max) across -55 °C to +125 °C. This enables use in single-cell lithium battery-powered systems where supply voltage drops below 3.0 V during discharge.

How does the M74HC259 differ from a standard 8-bit D-type register?

Unlike a parallel-load register, the M74HC259 uses 3 address lines to select only one of eight outputs for update on each ENABLE edge - all others retain state. This eliminates need for separate enable lines per output and reduces control bus overhead in systems with sparse or sequential bit updates.

Is the SO16 package RoHS and REACH compliant?

Yes - the M74HC259RM13TR SO16 package meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 requirements, and is manufactured under ST's ECOPACK® environmental program with halogen-free and lead-free finish per J-STD-020 moisture sensitivity level 3.