STMicroelectronics HCF4022BEY

Overview

HCF4022BEY from STMicroelectronics is a B-series CMOS 4-stage Johnson counter with 8 decoded outputs, operating up to 10 MHz (typ.) at VDD = 10 V, featuring Schmitt-trigger clock input, active-high RESET, and ripple-capable CARRY-OUT. It delivers spike-free decoded outputs in DIP-16 package for sequential timing control in industrial logic systems.

For engineers reviewing the HCF4022BEY datasheet, HCF4022BEY pinout, HCF4022BEY application, or HCF4022BEY equivalent, key selection criteria include decoded output timing integrity, clock inhibit functionality, quiescent current ≤300 µA at 10 V, and compatibility with 3–20 V supply rails across -55°C to +125°C.

Technical Context

The HCF4022BEY implements a synchronous 4-bit Johnson counter architecture with anti-lock gating to ensure deterministic state progression. Its Schmitt-trigger clock input accepts unlimited rise/fall times, while the CLOCK INHIBIT signal enables dynamic counting enable/disable without metastability risk.

All eight decoded outputs (Q0–Q7) are active-high, low-impedance, and mutually exclusive-each asserted for exactly one full clock cycle. The CARRY-OUT signal toggles every 8 clocks and is designed for cascading multiple counters in divide-by-N configurations up to N < 10.

Key Specifications

Pinout & Package

Package: Plastic DIP-16 (0.25 inch width), JEDEC MS-001 compliant, through-hole mountable with 2.54 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4022BE and 74HC4017D, the HCF4022BEY offers superior speed and integrated carry logic for reliable multi-counter chaining, while maintaining full backward compatibility with CD4000-series voltage and timing margins.

Availability

HCF4022BEY is available at Aetrix Electronics and suitable for industrial sequential control, LED display sequencing, divide-by-N timing generation, and reset-synchronized logic state machines requiring stable component supply across extended temperature ranges.

Supply support for HCF4022BEY 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 HCF4022BEY belongs to ST's legacy HCF4000B series of radiation-hardened, wide-supply CMOS logic devices engineered for reliability in harsh industrial and aerospace environments.

FAQ

What is the minimum recommended VDD for reliable operation of HCF4022BEY?

The HCF4022BEY is specified for reliable operation down to 3 V per JEDEC JESD13B. Below this, output drive strength drops significantly, and noise margins degrade below 1 V. For industrial applications, 5 V or higher is recommended to maintain full timing performance and 2 V noise margin.

Can HCF4022BEY drive standard LEDs directly without current-limiting resistors?

No. While its output sink current reaches 2.6 mA at VDD = 10 V, this exceeds typical LED forward current ratings (5–20 mA). A series resistor is mandatory to limit current - e.g., 470 Ω for 5 V supply and 10 mA LED current. Driving without resistance risks output transistor degradation over time.

Is the CARRY-OUT signal synchronized to the decoded outputs?

Yes. CARRY-OUT transitions on the same clock edge that advances Q7 to Q0, ensuring deterministic alignment with the Johnson counter's wraparound event. Its propagation delay (125–250 ns at VDD = 10 V) matches decoded output delays, enabling glitch-free cascading without external synchronization logic.

How does CLOCK INHIBIT interact with an active RESET condition?

CLOCK INHIBIT is overridden by RESET: when RESET is high, the counter resets to zero regardless of CLOCK INHIBIT state. After RESET deasserts, counting resumes only if CLOCK INHIBIT is low. This priority ensures fail-safe initialization even during inhibit assertion.