Nexperia USA Inc. HEF4017BT,653

Overview

HEF4017BT,653 from Nexperia is a CMOS 5-stage Johnson decade counter IC with ten active-HIGH decoded outputs (Q0–Q9), dual-edge-triggered clock inputs (CP0 and CP1), an active-LOW carry output (Q5-9), and an asynchronous master reset (MR). It operates from 3 V to 15 V, supports industrial temperature range (−40 °C to +125 °C), and features Schmitt-trigger clock inputs for noise immunity-used in sequential timing control, LED chasers, and decimal decoding circuits.

For engineers reviewing the HEF4017BT,653 datasheet, HEF4017BT,653 pinout, HEF4017BT,653 application, or HEF4017BT,653 equivalent, key selection criteria include its dual-clock edge sensitivity, automatic illegal-state correction within 11 clocks, wide VDD tolerance, decoded output drive capability, and SO16 package compatibility with legacy 4000-series logic layouts.

Technical Context

The HEF4017BT,653 implements a 5-flip-flop Johnson counter architecture with internal decoding logic that generates mutually exclusive HIGH pulses across Q0–Q9 on each valid clock transition. Its dual-clock interface (CP0 rising-edge / CP1 falling-edge) enables flexible cascading and synchronous multi-stage sequencing without external gating.

Internal automatic code correction ensures recovery from metastable or illegal states within ≤11 clock cycles, while Schmitt-trigger inputs tolerate slow-rising/falling edges up to 0.08 μs/V at 15 V. The Q5-9 carry output goes LOW during states 5–9, enabling direct ripple-cascading of multiple counters for extended division ratios.

Key Specifications

Pinout & Package

HEF4017BT,653 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4017BE and 74HC4017D, the HEF4017BT,653 uniquely combines industrial temperature rating (−40 °C to +125 °C), explicit Q5-9 carry functionality, Schmitt-trigger clock inputs, and full 3–15 V parametric validation - making it the only option qualified for ruggedized, wide-supply, and cascade-critical decade counting.

Availability

HEF4017BT,653 is available at Aetrix Electronics and suitable for LED chaser circuits, industrial timer modules, sequential motor controllers, and decimal display systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4017BT,653 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions with emphasis on reliability and manufacturability.

The HEF4017BT,653 belongs to Nexperia's legacy 4000-series CMOS logic family, designed specifically for robust, low-power, wide-voltage-rail decade counting in industrial control, instrumentation, and electro-mechanical timing applications.

FAQ

What is the minimum pulse width required on the MR pin to ensure reliable reset?

The MR input requires a HIGH pulse of minimum 15 ns width at 15 V, 10 ns at 10 V, and 20 ns at 5 V to guarantee full reset across the industrial temperature range. Pulse width must exceed t_W values specified in Table 7; shorter pulses may result in incomplete state clearing or metastability in downstream logic.

Can CP0 and CP1 be driven simultaneously without causing undefined behavior?

No - simultaneous transitions on CP0 and CP1 violate the hold time requirements (t_h ≥ 10 ns at 15 V) and may cause race conditions or illegal states. The function table explicitly defines valid operations only when one clock is static while the other transitions; concurrent edges are undefined and must be avoided in layout and timing design.

Does the HEF4017BT,653 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs (including CP0, CP1, and MR) must be tied to VDD or VSS per Section 1 of the datasheet. Floating CMOS inputs increase static current, induce crosstalk, and risk latch-up. No internal pull-ups/pull-downs are provided; external connections are mandatory for reliable operation.

How does the Q5-9 carry output behave during illegal counter states?

During illegal states, Q5-9 remains HIGH until the internal correction circuit restores a valid Johnson code - typically within 11 clocks. Its behavior is not guaranteed during correction; designers must avoid using Q5-9 for critical cascade timing unless synchronized with MR or validated reset sequences.