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CD4017BE

CMOS Johnson decade counter, 10 decoded outputs, Schmitt clock, 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 from Texas Instruments is a CMOS 5-stage Johnson decade counter with 10 decoded outputs, Schmitt-trigger clock input, and carry-out for cascading, operating from 3V to 18V in a PDIP-16 package.

Key Specifications

Type	5-stage Johnson decade counter
Decoded Outputs	10 (Q0-Q9, active HIGH, one at a time)
Supply Voltage	3V to 18V
Clock Frequency	10MHz typical @ VDD=10V
Clock Trigger	Positive edge (rising)
Schmitt Trigger on Clock	Yes (unlimited rise/fall time)
Clock Inhibit	Active HIGH (stops counting)
Reset	Active HIGH (asynchronous, clears to Q0)
Carry Out	1 pulse per 10 clock cycles (for cascading)
Output Current	1.5mA source/sink @ VDD=10V
Operating Temperature	-55°C to +125°C
Package	PDIP-16 (19.3 x 6.35mm)

Features

10 decoded outputs — only one HIGH at a time
Johnson counter architecture — spike-free outputs
Schmitt trigger clock input — no rise/fall time restriction
Anti-lock gating ensures proper counting sequence
Carry-out for multi-stage cascading
Fully static operation — no minimum clock frequency
Wide supply range: 3V to 18V

Applications

LED chaser / sequential lighting
Frequency division (divide by N)
Decimal counting and display
Timer and sequencer circuits
Counter control applications

Product Introduction:CD4017BE Product Introduction

The CD4017BE from Texas Instruments is a 5-stage Johnson (twisted-ring) counter with 10 decoded active-HIGH outputs. On each rising edge of the clock, the counter advances to the next state, and the corresponding decoded output goes HIGH while all others remain LOW. The Johnson counter architecture guarantees spike-free decoded outputs because only one bit changes per clock cycle (unlike binary counters where multiple bits can change simultaneously). The Schmitt-trigger clock input allows unlimited clock rise and fall times, making it compatible with slowly-varying signals from RC oscillators or mechanical switches. The clock inhibit pin (active HIGH) stops counting without resetting; the reset pin (active HIGH) clears the counter to state 0. The carry-out (CO) pin produces one pulse for every 10 clock pulses and connects to the clock input of the next CD4017BE for multi-decade counting. The BE suffix denotes the PDIP-16 plastic package with full military temperature range (-55°C to +125°C).

Working Principle:CD4017BE Working Principle

The CD4017BE uses a 5-stage Johnson (twisted-ring) counter consisting of five D flip-flops with the complement of the last stage fed back to the first stage input. A 5-stage Johnson counter has 2×5=10 valid states, each corresponding to one of the 10 decoded outputs. On each rising clock edge (when clock inhibit is LOW), the counter shifts by one position: if Q4 was 0, it shifts a 1 in from the left; if Q4 was 1, it shifts a 0 in. This creates the sequence: 00000, 10000, 11000, 11100, 11110, 11111, 01111, 00111, 00011, 00001, then back to 00000. A 10-input OR-equivalent decoder maps each of these 10 states to one of the Q0-Q9 outputs. Because only one flip-flop changes state per clock cycle, the decoded outputs are always glitch-free. Anti-lock gating prevents the counter from entering any of the 22 invalid states (5 flip-flops have 32 total states, only 10 are valid). If power-up or noise causes an invalid state, the anti-lock logic forces it back into the valid counting sequence within a few clock cycles. The carry-out is simply Q4 AND NOT-Q5 (or the equivalent), producing a pulse that is HIGH for the first 5 clock cycles and LOW for the last 5, giving one complete pulse per 10 input clocks.

Pin Description:CD4017BE Pin Definition and Functions

Pin	Name	Type	Description
1	Q5	Output	Decoded output 5 (active HIGH)
2	Q1	Output	Decoded output 1 (active HIGH)
3	Q0	Output	Decoded output 0 (active HIGH, default after reset)
4	Q2	Output	Decoded output 2 (active HIGH)
5	Q6	Output	Decoded output 6 (active HIGH)
6	Q7	Output	Decoded output 7 (active HIGH)
7	Q3	Output	Decoded output 3 (active HIGH)
8	VSS	Power	Ground (0V)
9	Q8	Output	Decoded output 8 (active HIGH)
10	Q4	Output	Decoded output 4 (active HIGH)
11	Q9	Output	Decoded output 9 (active HIGH)
12	CO	Output	Carry-out (1 pulse per 10 clocks, for cascading)
13	CLK INH	Input	Clock inhibit (HIGH = stop counting)
14	CLK	Input	Clock input (rising edge triggered, Schmitt)
15	RST	Input	Reset (active HIGH, clears to Q0)
16	VDD	Power	Positive supply (3V to 18V)

Application Scenarios:In which products and applications isCD4017BE used

LED Chaser: CLK from NE555 oscillator; Q0-Q9 drive 10 LEDs; each LED on for one clock period; creates classic Knight Rider effect
Divide-by-N: Connect Q(N) to RST; counter counts 0 to N-1 then resets; CO or Q(N-1) gives divide-by-N output
Cascaded Counter: CO of first 4017 → CLK of second; first counts 0-9, second counts 10-99; 100 states from two chips
Sequencer: Each Q output enables a different circuit stage; CLK steps through sequence; CLK INH pauses
Touch Switch: 4017 with Q0 and Q1 driving relay; each touch toggles CLK; alternates between on (Q1) and off (Q0)

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).