5-stage Johnson counter
DESCRIPTION
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
table).
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.
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