STMicroelectronics HCF4089BEY

Overview

HCF4089BEY from STMicroelectronics is a B-series CMOS 4-bit binary rate multiplier IC that generates an output pulse train equal to (N/16) × clock input rate, where N is the 4-bit binary input (0–15). It features cascading capability, synchronous internal counter, SET-to-15 and "15" detect outputs, and operates from 3V to 20V supply. Used in analog function generation, A/D-D/A conversion, and frequency division circuits.

For engineers reviewing the HCF4089BEY datasheet, HCF4089BEY pinout, HCF4089BEY application, or HCF4089BEY equivalent, key selection criteria include its 4-bit rate multiplication ratio, cascading support for multi-digit operations, quiescent current ≤600 µA at 20V, and DIP-16 package compatibility with legacy industrial timing and control designs.

Technical Context

The HCF4089BEY implements a synchronous 4-bit counter combined with combinational logic to produce deterministic pulse trains based on the A/B/C/D inputs. Its output duty cycle is precisely controlled by the binary weight of each input bit, enabling linear interpolation between integer multiples of 1/16 clock rate.

It supports two cascading modes-ADD and MULTIPLY-via CASCADE, INHIBIT IN/OUT, and STROBE signals, allowing expansion to 8-bit or higher resolution rate multiplication without external logic. The SET and CLEAR inputs provide synchronous initialization and reset under system control.

Key Specifications

Pinout & Package

Package: Plastic DIP-16 (0.300 inch width), 20 mm × 8.5 mm body, 2.54 mm lead pitch, through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar binary rate multiplication applications.

Compared with CD4089BE and MC14089BDR2G, the HCF4089BEY offers guaranteed industrial temperature operation, JEDEC-compliant parametric stability, and direct DIP-16 drop-in replacement capability-making it the sole choice for field-deployed, long-lifecycle instrumentation and control systems.

Availability

HCF4089BEY is available at Aetrix Electronics and suitable for precision waveform generation, legacy industrial controller upgrades, and analog interface retrofitting requiring stable component supply and long-term obsolescence mitigation.

Supply support for HCF4089BEY 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 strong heritage in CMOS logic and analog-mixed-signal design.

The HCF4089BEY belongs to ST's legacy HCF4000B series of radiation-hardened, high-voltage-tolerant CMOS logic devices engineered for reliability in harsh industrial, aerospace, and test equipment environments.

FAQ

What is the function of the CASCADE pin on HCF4089BEY?

The CASCADE pin selects between ADD and MULTIPLY cascading modes when connecting multiple HCF4089BEY devices. In ADD mode, it enables summing of fractional rates (e.g., 11/16 + 13/256); in MULTIPLY mode, it configures the device for two-variable multiplication (A × B)/256. Its logic level determines internal carry path routing and must be set before enabling STROBE.

Can HCF4089BEY operate at 3.3 V?

No-HCF4089BEY is specified for minimum VDD = 3 V, but its DC and dynamic parameters (e.g., VOH, fCL, tPD) are only guaranteed from VDD = 5 V onward per the datasheet. At 3.3 V, output drive strength, noise margin, and maximum clock frequency degrade significantly and are not characterized; use only within the validated 5–20 V range.

How does the SET TO "15" input differ from the CLEAR input?

SET TO "15" is a synchronous load command that forces the internal 4-bit counter to state 15 on the next rising CLOCK edge, preserving timing alignment. CLEAR is asynchronous and immediately resets the counter and outputs to zero regardless of clock phase-introducing potential glitches if asserted mid-cycle. SET enables predictable initialization; CLEAR provides emergency reset.

Why are there two OUT pins (pins 5 and 6)?

Pins 5 and 6 are electrically identical rate output terminals provided for layout flexibility and current handling. They may be wired in parallel to double sink/source capability (up to ±6.8 mA at VDD = 15 V), or used separately for differential signaling or redundancy. No internal logic distinction exists-the same pulse train appears on both pins simultaneously.