STMicroelectronics HCF4018BEY

Overview

HCF4018BEY from STMicroelectronics is a B-series CMOS presettable Johnson counter IC with five cascaded stages, symmetrical buffered Q1–Q5 outputs, and full static operation. It supports divide-by-2 to divide-by-10 configurations via internal feedback (e.g., Q5→DATA for ÷10), operates up to 10 MHz (typ.) at VDD = 10 V, features Schmitt-trigger clock input for unlimited rise/fall times, and is rated for supply voltages from 3 V to 20 V - used in digital timing control, frequency division, and programmable logic sequencers.

For engineers reviewing the HCF4018BEY datasheet, HCF4018BEY pinout, HCF4018BEY application, or HCF4018BEY equivalent, key selection criteria include its Johnson counter architecture, presettable jam inputs (JAM1–JAM5), RESET/PRESET ENABLE control logic, and guaranteed quiescent current ≤300 µA at VDD = 15 V across –55°C to +125°C.

Technical Context

The HCF4018BEY implements a 5-stage Johnson counter with asynchronous RESET and synchronous preset capability via JAM inputs and PRESET ENABLE. Count advancement occurs on the positive clock edge, and Schmitt-trigger clock input eliminates sensitivity to slow signal edges.

Feedback from Q1–Q5 enables integer division ratios of 2, 4, 6, 8, or 10 without external gates; higher ratios (e.g., ÷7, ÷9) require external NAND gating (e.g., with HCF4011B). Propagation delays range from 65 ns (min) to 550 ns (max), depending on VDD and signal path (e.g., RESET→Q vs. CLOCK→Q).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Johnson counter applications.

Compared with CD4018BE and MC14018BCP, the HCF4018BEY offers superior high-temperature operation (+125°C), faster propagation (90 ns typ.), and integrated Schmitt triggering - making it the preferred choice for ruggedized timing in industrial automation and automotive under-hood modules.

Availability

HCF4018BEY is available at Aetrix Electronics and suitable for industrial control sequencing, legacy system upgrades, and programmable frequency division requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HCF4018BEY 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 solutions with vertical manufacturing capabilities.

The HCF4018BEY belongs to ST's legacy B-series CMOS logic family, designed specifically for robust, wide-voltage digital timing functions in harsh environments where reliability and temperature resilience are critical.

FAQ

What is the maximum clock frequency supported by HCF4018BEY at VDD = 5 V?

At VDD = 5 V, the HCF4018BEY supports a maximum clock frequency of 6 MHz (typical 3 MHz), with propagation delay tPLH/tPHL up to 400 ns and minimum clock pulse width of 80 ns. This rating is validated per JEDEC JESD13B and confirmed across –55°C to +125°C operating range.

Can HCF4018BEY be used to implement a divide-by-7 counter?

Yes - a divide-by-7 counter is implemented by feeding Q4 and Q2 outputs through an external HCF4011B dual 2-input NAND gate to generate a feedback signal to the DATA input. This configuration exploits the Johnson counter's overlapping states and is documented in the device's typical application section (page 7).

Does HCF4018BEY require external pull-up resistors on its outputs?

No - the HCF4018BEY features fully buffered CMOS outputs with rail-to-rail VOH/VOL (e.g., VOH = 9.95 V at VDD = 10 V) and ±2.4 mA drive strength. Pull-ups are unnecessary unless interfacing with open-drain inputs or level-shifting to non-CMOS logic families.

Is the RESET function synchronous or asynchronous?

The RESET input is asynchronous: asserting RESET = HIGH immediately forces all Q1–Q5 outputs LOW, independent of clock phase or PRESET ENABLE state. Release timing is governed by tREM (10 ns min. at VDD = 15 V), ensuring reliable deassertion before next clock edge.