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CD4017BE

CMOS decade counter, 10 decoded outputs, Johnson, Schmitt clk, PDIP-16

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Manufacturer Part：

CD4017BE

Package：

PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

Brand：

Product Categories：

Integrated Circuits ICs, Interface ICs

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Description

Product Overview

The CD4017BE is a CMOS 5-stage Johnson decade counter with 10 decoded outputs, Schmitt-trigger clock input, and carry-out for cascading in a 16-pin PDIP package.

Key Specifications

Counter Type	5-stage Johnson (decade), 10 decoded outputs
Logic Family	CD4000B CMOS
Supply Voltage Range	3V to 18V
Max Clock Frequency	10MHz typical @ VDD=10V, 5.5MHz @ VDD=5V
Clock Input	Schmitt trigger (unlimited rise/fall time)
Trigger Edge	Rising edge (positive)
Outputs	10 decoded (Q0-Q9, one HIGH at a time) + Carry-out
Output Current	±1.5mA @ 5V, ±3.4mA @ 10V
Control Inputs	CLOCK, CLOCK INHIBIT, RESET
Quiescent Current	30µA max @ 5V, 60µA max @ 10V
Operating Temperature	-55°C to +125°C
Package	PDIP-16 (19.3 x 6.35mm)

Features

10 decoded outputs (Q0-Q9) with one HIGH per clock cycle
Johnson counter configuration for spike-free outputs
Schmitt trigger clock input (no rise/fall time restriction)
Clock inhibit for pausing the count
Asynchronous reset (active HIGH)
Carry-out for cascading multiple counters
Anti-lock gating ensures proper counting sequence
Fully static operation (no minimum clock frequency)

Applications

LED chaser and sequential lighting
Decimal counting and display
Frequency division (divide by N)
Sequencer and timer circuits
Counter control and event counting

Product Introduction:CD4017BE Product Introduction

The CD4017BE from Texas Instruments is a 5-stage Johnson decade counter with 10 decoded outputs (Q0 through Q9) and a carry-out signal. On each rising edge of the clock input, the counter advances one position, and the corresponding decoded output goes HIGH while all others remain LOW. The Johnson counter (twisted-ring) configuration ensures that only one output is active at a time and that the decoded outputs are spike-free, unlike binary counter + decoder combinations. The Schmitt trigger on the clock input provides pulse shaping, allowing unlimited clock rise and fall times—no need for a clean square wave. The CLOCK INHIBIT pin (active HIGH) pauses counting without losing the current state. The RESET pin (active HIGH) immediately forces Q0 HIGH and all other outputs LOW. The CARRY-OUT signal completes one cycle every 10 clock pulses and serves as the clock input for the next stage in cascaded counter chains (divide-by-100, divide-by-1000, etc.). The E suffix denotes the PDIP-16 plastic through-hole package.

Working Principle:CD4017BE Working Principle

The CD4017BE uses a 5-stage Johnson (twisted-ring) counter where the complement of the last stage output is fed back to the first stage input. In a 5-stage Johnson counter, the count sequence is: 00000, 10000, 11000, 11100, 11110, 11111, 01111, 00111, 00011, 00001, then back to 00000 — producing 10 unique states. Each of these 10 states is decoded by simple 2-input AND gates to produce the Q0-Q9 outputs. The Johnson configuration guarantees that only one decoded output is HIGH at any time, and the outputs transition cleanly without spikes. On each rising clock edge (when CLOCK INHIBIT is LOW), the counter advances to the next state. The CARRY-OUT output goes HIGH for the first 5 clock cycles (Q0-Q4 active) and LOW for the next 5 cycles (Q5-Q9 active), providing a symmetrical 50% duty cycle output at 1/10th the clock frequency. When cascading, CARRY-OUT of the first counter connects to the CLOCK input of the second counter, creating a divide-by-100 counter. The RESET pin forces all stages to 00000, making Q0 HIGH. Anti-lock gating prevents the counter from entering any of the 22 invalid states (out of 32 possible) that are not part of the normal counting sequence.

Pin Description:CD4017BE Pin Definition and Functions

Pin	Name	Type	Description
1	Q5	Output	Decoded output 5
2	Q1	Output	Decoded output 1
3	Q0	Output	Decoded output 0 (active after reset)
4	Q2	Output	Decoded output 2
5	Q6	Output	Decoded output 6
6	Q7	Output	Decoded output 7
7	Q3	Output	Decoded output 3
8	VSS	Power	Ground
9	Q8	Output	Decoded output 8
10	Q4	Output	Decoded output 4
11	Q9	Output	Decoded output 9
12	CARRY-OUT	Output	Carry output (1 cycle per 10 clocks, 50% duty)
13	CLOCK INHIBIT	Input	Clock inhibit (HIGH = pause counting)
14	CLOCK	Input	Clock input (rising edge triggered, Schmitt)
15	RESET	Input	Master reset (active HIGH, async)
16	VDD	Power	Supply (3V to 18V)

Application Scenarios:In which products and applications isCD4017BE used

LED Chaser: Connect 10 LEDs to Q0-Q9; clock from NE555 astable creates a rotating LED pattern at adjustable speed
Divide-by-N: Connect RESET to QN+1 to divide by any N from 1 to 10 (e.g., RESET to Q7 for divide-by-6)
Sequential Relay: 10 outputs activate 10 relays in sequence; CARRY-OUT cascades to next CD4017 for 20+ relay sequences
Frequency Divider: CARRY-OUT provides divide-by-10 with 50% duty cycle; cascade for ÷100, ÷1000
Game Circuit: Schmitt clock input accepts debounced button press; output drives 7-segment decoder for dice roller

Alternative Models:What chips are recommended as replacements for CD4017BE

Model	Manufacturer	Key Difference	Package	Supply
CD4017BM	TI	SOIC-16 surface-mount version with identical logic function and 3-18V range	SOIC-16	3-18V
CD4017BE	TI	Through-hole DIP version for prototyping and legacy board repair	DIP-16	3-18V
HEF4017BT	NXP	Pin-compatible CMOS version with improved ESD protection and 3-15V supply	SOIC-16	3-15V
MC144017BDR2G	onsemi	Pin-compatible equivalent with RoHS compliance and AEC-Q100 automotive option	SOIC-16	3-18V
74HC4017D	TI/Nexperia	HC CMOS version with higher speed and 2-6V supply for modern logic systems	SOIC-16	2-6V
74HC4017N	TI/Nexperia	HC CMOS through-hole version for prototyping with 2-6V supply range	DIP-16	2-6V
74HCT4017D	Nexperia	HCT version with TTL-compatible inputs for mixed 5V TTL/CMOS systems	SOIC-16	4.5-5.5V

CD4017 is the CMOS 4000-series decade counter/divider with decoded output operating over the wide 3-18V supply range. The HEF4017 (NXP) and MC144017 (onsemi) are direct pin-compatible equivalents. For higher speed at the cost of narrower voltage range, the 74HC4017 HC/HCT families offer significantly faster propagation delay and lower power consumption at 2-6V. Surface-mount versions use the BM/M suffix (SOIC); through-hole versions use the BE suffix (DIP).