NXP Semiconductors 74HCT4017D,652

Overview

74HCT4017D,652 from Nexperia is a TTL-level-compatible 5-stage Johnson decade counter IC with 10 decoded active-HIGH outputs (Q0–Q9), one carry output (Q5-9, active LOW), dual edge-triggered clock inputs (CP0 rising-edge, CP1 falling-edge), and asynchronous master reset (MR, active HIGH). It operates from 4.5 V to 5.5 V, delivers propagation delays as low as 22 ns at 4.5 V, and is rated for -40 °C to +125 °C - used in sequential LED drivers, divide-by-N timing circuits, and industrial control state machines.

For engineers reviewing the 74HCT4017D,652 datasheet, 74HCT4017D,652 pinout, 74HCT4017D,652 application, or 74HCT4017D,652 equivalent, key selection criteria include its dual-clock edge sensitivity, Q5-9 carry output for cascading, asynchronous MR behavior, TTL input compatibility, and SO16 package thermal performance up to +125 °C.

Technical Context

The 74HCT4017D,652 implements a 5-flip-flop Johnson counter architecture with internal decoding logic that maps internal states to ten mutually exclusive Q0–Q9 outputs. Its dual-clock interface allows flexible triggering: CP0 advances on LOW-to-HIGH while CP1 = LOW; CP1 advances on HIGH-to-LOW while CP0 = HIGH - enabling precise control over counting direction and synchronization.

Automatic illegal-state recovery corrects invalid codes within ≤11 clock cycles. The Q5-9 output goes LOW during states 5–9, providing a clean carry signal for multi-digit decade counters. MR overrides all clock activity, forcing Q0 = HIGH and Q1–Q9 = LOW regardless of clock phase or frequency.

Key Specifications

Pinout & Package

74HCT4017D,652 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch - suitable for automated PCB assembly and offers thermal resistance of 12.4 mW/K above 110 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4017D,653 and CD4017BE, the 74HCT4017D,652 uniquely combines TTL input compatibility, dual-edge clocking, and a dedicated Q5-9 carry output - making it optimal for robust, high-speed, cascaded decade counting in industrial 5 V systems.

Availability

74HCT4017D,652 is available at Aetrix Electronics and suitable for LED sequencers, industrial timers, state-machine controllers, and cascaded counter modules requiring stable component supply across automotive, factory automation, and test equipment programs.

Supply support for 74HCT4017D,652 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 delivering high-performance logic, analog, and discrete components with focus on reliability, efficiency, and manufacturability for industrial and automotive markets.

The 74HCT4017D,652 belongs to Nexperia's 74HCT logic family - engineered for seamless integration into 5 V TTL-based systems requiring robust, low-power, temperature-hardened decade counting with deterministic reset behavior.

FAQ

What is the function of the Q5-9 output?

The Q5-9 output is an active-LOW carry signal that remains LOW during counter states 5 through 9 and HIGH otherwise. It is specifically designed to drive the CP0 input of a second 74HCT4017D,652 for cascaded decade counting - enabling modulo-100 or higher division without external logic gates or timing constraints.

Can CP0 and CP1 be used simultaneously?

No - simultaneous assertion of valid edges on both CP0 and CP1 violates the functional table and may cause unpredictable or extra counting. The device requires CP1 = LOW when using CP0 (rising-edge), and CP0 = HIGH when using CP1 (falling-edge); mixing active edges risks metastability or illegal states.

How does the master reset (MR) behave during clock activity?

MR is fully asynchronous: asserting MR HIGH immediately forces Q0 = HIGH and Q1–Q9 = LOW, overriding all clock inputs regardless of CP0/CP1 state or edge timing. The counter remains in this reset state until MR returns LOW, after which the next valid clock edge resumes counting from Q0.

Is the 74HCT4017D,652 compatible with 3.3 V microcontrollers?

Not directly - its TTL input thresholds require VIH ≥ 2.0 V, but 3.3 V GPIOs typically meet this. However, VIL ≤ 0.8 V is easily satisfied. For reliable operation, ensure the microcontroller's HIGH output exceeds 2.0 V at load, and use series resistors if driving from open-drain 3.3 V sources to avoid marginal VIH.