STMicroelectronics M74HC163B1R

Overview

M74HC163B1R from STMicroelectronics is a high-speed CMOS synchronous 4-bit binary presettable counter with asynchronous clear, synchronous load, and cascading carry output. It operates from 2V to 6V, delivers 62 MHz max clock frequency at 6V, features ±4 mA output drive, and is pin- and function-compatible with standard 74-series 163 counters for drop-in replacement in legacy TTL-to-CMOS upgrades.

For engineers reviewing the M74HC163B1R datasheet, M74HC163B1R pinout, M74HC163B1R application, or M74HC163B1R equivalent, key selection criteria include synchronous preset capability, dual enable inputs (PE/TE) for ripple-cascade control, guaranteed noise immunity (28% VCC), balanced propagation delays (tPLH ≅ tPHL), and DIP-16 packaging for through-hole prototyping and industrial control boards.

Technical Context

The M74HC163B1R implements a fully synchronous 4-bit binary counter using silicon gate C2MOS technology, where all state changes-including presetting and counting-are edge-triggered on the rising clock edge. Its asynchronous CLEAR input overrides all other controls, forcing QA–QD to logic low independently of clock timing.

Cascading is enabled via TE (count-enable carry input) and CARRY output, which asserts only when TE = HIGH and all four outputs QA–QD = HIGH-enabling modular N-bit counter construction without external logic. Input protection circuits guard against ESD and transient overvoltage per IEC 61000-4-2 Level 2.

Key Specifications

Pinout & Package

Package: Plastic DIP-16 (0.300" wide), JEDEC MS-001, lead pitch 2.54 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous 4-bit counter applications.

Compared with SN74HC163N and CD74HC163E, the M74HC163B1R offers identical core functionality and DIP-16 compatibility but is optimized for industrial-grade reliability at −55°C to +125°C operation, with tighter propagation delay consistency across voltage and temperature.

Availability

M74HC163B1R is available at Aetrix Electronics and suitable for industrial PLC timer modules, digital panel meter counting, and legacy TTL system upgrades requiring stable component supply and long-term obsolescence management.

Supply support for M74HC163B1R 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 discrete devices for industrial, automotive, and consumer markets.

The M74HC163B1R belongs to ST's high-speed CMOS logic family, designed specifically for reliable, low-power, pin-compatible replacements of legacy 74-series logic in industrial control, instrumentation, and upgrade applications.

FAQ

What is the difference between asynchronous CLEAR and synchronous LOAD in the M74HC163B1R?

Asynchronous CLEAR (Pin 1) forces QA–QD to logic LOW immediately, regardless of clock state, enabling instant reset. Synchronous LOAD (Pin 9, active LOW) transfers data from inputs A–D to outputs QA–QD only on the next rising clock edge, preserving timing alignment with the system clock domain.

Can the M74HC163B1R operate reliably at 3.3V supply?

Yes - the M74HC163B1R is fully specified from 2V to 6V. At 3.3V, it delivers typical fMAX ≈ 40 MHz, VIH ≈ 2.31V, VIL ≈ 1.09V, and maintains ±4 mA output drive, making it compatible with 3.3V microcontroller interfaces without level shifters.

How is the CARRY output used in multi-stage counter designs?

CARRY (Pin 15) goes HIGH only when TE = HIGH and QA–QD = 1111. In cascaded configurations, it drives the TE input of the next stage, enabling seamless modulo-256 (or higher) counting without external AND gates or timing hazards.

Is the M74HC163B1R still in active production?

Yes - the M74HC163B1R remains an active, non-obsolete part per STMicroelectronics' current product status. It is manufactured in DIP-16 packaging and supported with full datasheet documentation, reliability data, and long-term supply commitment for industrial customers.