5-stage Johnson counter
The HEF4017B is a 5-stage Johnson decade counter with
ten spike-free decoded active HIGH outputs (Oo to O9), an
active LOW output from the most significant flip-flop (O5-9),
active HIGH and active LOW clock inputs (CP0, CP1) and
an overriding asynchronous master reset input (MR).
The counter is advanced by either a LOW to HIGH
transition at CP0 while CP1 is LOW or a HIGH to LOW
transition at CP1 while CP0 is HIGH (see also function
When cascading counters, the O5-9 output, which is LOW
while the counter is in states 5, 6, 7, 8 and 9, can be used
to drive the CP0 input of the next counter.
A HIGH on MR resets the counter to zero
(Oo = O5-9 = HIGH; O1 to O9 = LOW) independent of the
clock inputs (CP0, CP1).
Automatic code correction of the counter is provided by an
internal circuit: following any illegal code the counter
returns to a proper counting mode within 11 clock pulses.
Schmitt-trigger action in the clock input makes the circuit
highly tolerant to slower clock rise and fall times.
Fig.1 Functional diagram.
Fig.2 Pinning diagram.
O0 to O9
clock input (LOW to HIGH triggered)
clock input (HIGH to LOW triggered)
master reset input
carry output (active LOW)
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications
HEF4017BP(N): 16-lead DIL; plastic (SOT38-1)
HEF4017BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)
HEF4017BT(D): 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America