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74HC4017D

Johnson decade counter with 10 decoded outputs

Philips Electronics 

Philips Semiconductors

Johnson decade counter with 10 decoded outputs

Product specification

74HC/HCT4017

APPLICATION INFORMATION

Some applications for the “4017” are:

• Decade counter with decimal decoding

• 1 out of n decoding counter (when cascaded)

• Sequential controller

• Timer

Figure 10 shows a technique for extending the number of decoded output states for the “4017”. Decoded outputs are

sequential within each stage and from stage to stage, with no dead time (except propagation delay).

It is essential not to enable the counter on CP1

when CP0 is HIGH, or on CP0 when CP1 is LOW,

as this would cause an extra count.

Fig.10 Counter expansion

Figure 11 shows an example of a divide-by 2 through divide-by 10 circuit using one “4017”. Since “4017” has an

asynchronous reset, the output pulse widths are narrow (minimum expected pulse width is 6 ns). The output pulse widths

can be enlarged by inserting a RC network at the MR input.

Fig.11 Divide-by 2 through divide-by 10.

PACKAGE OUTLINES

See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.

December 1990

12

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