STMicroelectronics M74HC4040B1R

Overview

M74HC4040B1R from STMicroelectronics is a high-speed CMOS 12-stage binary ripple counter with pin- and function-compatibility to the 74-series 4040. It operates across 2V–6V, delivers 70 MHz max clock frequency (typ. at VCC = 6V), features symmetrical 4 mA output drive, and resets synchronously via active-high CLEAR. Used in frequency division (÷4096), timing control, and event counting circuits in industrial timers and digital logic systems.

For engineers reviewing the M74HC4040B1R datasheet, M74HC4040B1R pinout, M74HC4040B1R application, or M74HC4040B1R equivalent, key selection criteria include propagation delay matching (tPLH/tPHL ≈ 4–13 ns at 6V), low ICC (≤4 µA typ.), wide VCC range (2–6V), noise immunity (VNIH/VNIL ≥28% VCC), and DIP-16 package compatibility with legacy 74/4000-series layouts.

Technical Context

The M74HC4040B1R implements a cascaded chain of 12 edge-triggered D-type flip-flops, where each stage divides the input clock by two on the rising edge. The CLEAR signal asynchronously resets all Q outputs to logic low without requiring clock synchronization.

Its silicon gate C2MOS process enables rail-to-rail output swing, balanced tPLH/tPHL delays, and high noise immunity. Input protection diodes and controlled output impedance support robust operation in mixed-signal environments with transient voltage exposure.

Key Specifications

Pinout & Package

Package: Plastic DIP-16 (0.300" width), JEDEC MS-001, body dimensions 20.0 × 8.5 × 3.3 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-stage binary counter applications.

Compared with SN74HC4040N and CD74HC4040E, the M74HC4040B1R offers the widest operating temperature range (–55°C to 125°C), lowest quiescent current (4 µA max), and highest guaranteed fMAX (70 MHz), making it optimal for ruggedized industrial and automotive timing subsystems where reliability trumps marginal cost savings.

Availability

M74HC4040B1R is available at Aetrix Electronics and suitable for industrial timer modules, digital logic sequencers, frequency synthesis references, and legacy system upgrades requiring stable component supply and long-term obsolescence management.

Supply support for M74HC4040B1R 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The M74HC4040B1R belongs to ST's high-speed HC logic family, engineered for pin-compatible migration from legacy 74/4000-series devices while delivering improved speed, power efficiency, and noise immunity in industrial control and timing applications.

FAQ

Is M74HC4040B1R compatible with 5 V TTL logic inputs?

Yes - its VIH minimum is 3.15 V at VCC = 4.5 V and 4.2 V at VCC = 6 V, exceeding TTL's 2.0 V high-level threshold. Direct interface with 74LS/74F outputs is safe without level-shifting, provided VCC ≥ 4.5 V and load capacitance remains ≤50 pF.

What is the maximum recommended clock rise time for reliable operation at 60 MHz?

At VCC = 6 V, the datasheet specifies maximum input rise/fall time of 400 ns - but for 60 MHz operation, measured tr/tf must be ≤10 ns to meet the 7 ns minimum pulse width requirement and avoid setup/hold violations at the first flip-flop input.

Can CLEAR be asserted during clock activity without causing metastability?

Yes - CLEAR is asynchronous and overrides all clocked behavior. When HIGH, it forces all Q outputs to LOW immediately, independent of clock edge timing. No metastability risk exists because the reset path bypasses the flip-flop data path entirely.

Does M74HC4040B1R require external pull-up resistors on Q outputs?

No - outputs are push-pull CMOS with symmetrical 4 mA drive capability. Pull-ups are unnecessary unless interfacing with open-drain nodes or implementing wired-AND logic; adding them unnecessarily increases static power and slows rise times.