STMicroelectronics M74HC4024B1R

Overview

M74HC4024B1R from STMicroelectronics is a high-speed CMOS 7-stage binary ripple counter with edge-triggered clock input (falling edge), active-high asynchronous reset, symmetrical output drive (±4 mA), 2–6 V operating range, and 79 MHz max clock frequency at 6 V. It serves as a frequency divider and timing sequencer in digital control logic, motor step indexing, and event counting circuits.

For engineers reviewing the M74HC4024B1R datasheet, M74HC4024B1R pinout, M74HC4024B1R application, or M74HC4024B1R equivalent, key selection criteria include propagation delay matching (tPLH/tPHL ≈ 5–15 ns at 6 V), noise immunity (VNIH/VNIL ≥ 28% VCC), quiescent current (ICC ≤ 4 µA), and DIP-14 package compatibility with legacy 74-series layouts.

Technical Context

The M74HC4024B1R implements a cascaded 7-bit asynchronous binary counter using silicon gate C2MOS technology, where each stage drives the next via Qn→CLOCK path, resulting in cumulative propagation delay across stages. Its falling-edge clock triggering and active-high CLEAR enable precise event synchronization and immediate state reset independent of clock phase.

Designed for robust operation across industrial temperature ranges (−55°C to +125°C), it features integrated ESD protection on all inputs, rail-to-rail output swing, and balanced AC/DC characteristics - including matched tPLH/tPHL delays and low-output impedance (|IOH| = |IOL| ≥ 4 mA) - ensuring reliable signal integrity in mixed-voltage logic systems.

Key Specifications

Pinout & Package

Package: Plastic DIP-14 (dual in-line package, 0.3" width), compliant with JEDEC MS-001, suitable for through-hole prototyping and industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 7-stage binary counter applications.

Compared with SN74HC4024N and CD74HC4024E, the M74HC4024B1R offers the highest verified fMAX (79 MHz) and lowest ICC (4 µA max at 25°C), making it optimal for high-speed, low-power timing-critical designs where thermal headroom and clock margin are constrained.

Availability

M74HC4024B1R is available at Aetrix Electronics and suitable for motor control indexing, industrial event counting, and frequency prescaling requiring stable component supply and long-term DIP-14 availability.

Supply support for M74HC4024B1R 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 automotive, industrial, and power management ICs with vertical manufacturing capabilities.

The M74HC4024B1R belongs to the 74HC logic family - designed for low-power, high-noise-immunity digital interfacing in harsh environments, bridging legacy TTL systems and modern mixed-voltage architectures.

FAQ

Is M74HC4024B1R compatible with 5 V TTL logic inputs?

Yes - its VIH(min) = 3.15 V and VIL(max) = 1.35 V at VCC = 4.5 V meet standard TTL input thresholds. When operated at VCC = 5 V, it reliably accepts 0–0.8 V LOW and 2–5 V HIGH signals from 74LS/74F families without external level shifting.

What is the maximum fan-out capability of M74HC4024B1R outputs?

Each output can drive up to 10 LS-TTL loads (or one 74HC input) under worst-case conditions: at VCC = 6 V, IOH = −4 mA and IOL = 4 mA ensure VOL ≤ 0.26 V and VOH ≥ 4.18 V, satisfying standard HC fan-out rules per JEDEC JESD78.

Can CLEAR be asserted during clock activity without causing metastability?

Yes - CLEAR is asynchronous and internally synchronized to avoid metastability. The datasheet confirms guaranteed reset within tPHL(CLEAR→Qn) ≤ 31 ns (6 V, −55°C to +125°C), with no setup/hold requirement relative to CLOCK, enabling safe reset assertion at any clock phase.

Does M74HC4024B1R require external pull-up or pull-down resistors on unused pins?

No - unused pins (8, 10, 13) are marked NC and must remain unconnected; internal protection diodes and CMOS input structure eliminate need for external biasing. Leaving them floating poses no risk of latch-up or undefined behavior per ST's design guidelines.