Philips Semiconductors
Product specification
Johnson decade counter with 10 decoded outputs
74HC/HCT4017
CP1) and an overriding asynchronous master reset input
(MR).
FEATURES
• Output capability: standard
• ICC category: MSI
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).
GENERAL DESCRIPTION
The 74HC/HCT4017 are high-speed Si-gate CMOS
devices and are pin compatible with the “4017” of the
“4000B” series. They are specified in compliance with
JEDEC standard no. 7A.
When cascading counters, the Q5-9 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
(Q0 = Q5-9 = HIGH; Q1 to Q9 = LOW) independent of the
clock inputs (CP0 and CP1).
The 74HC/HCT4017 are 5-stage Johnson decade
counters with 10 decoded active HIGH outputs (Q0 to Q9),
an active LOW output from the most significant flip-flop
(Q5-9), active HIGH and active LOW clock inputs (CP0 and
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.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
TYPICAL
SYMBOL
PARAMETER
CONDITIONS
UNIT
ns
HC
HCT
21
tPHL/ tPLH
fmax
propagation delay CP0, CP1 to Qn
maximum clock frequency
CL = 15 pF; VCC = 5 V 20
77
67
3.5
36
MHz
pF
CI
input capacitance
3.5
35
CPD
power dissipation capacitance per package
notes 1 and 2
pF
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi+∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
December 1990
2
NXP [ NXP ]
