Datasheet

December 1990 12
Philips Semiconductors Product specification
14-stage binary ripple counter with oscillator 74HC/HCT4060
Fig.11 External components connection for a crystal oscillator.
TYPICAL CRYSTAL OSCILLATOR
In Fig.11, R2 is the power limiting resistor.
For starting and maintaining oscillation a minimum
transconductance is necessary, so R2 should not
be too large. A practical value for R2 is 2.2 kΩ.
AC WAVEFORMS
Fig.12 Waveforms showing the clock (RS) to
output (Q
3
) propagation delays, the clock
pulse width, the output transition times and
the maximum clock frequency.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.13 Waveforms showing the master reset (MR)
pulse width, the master reset to output (Q
n
)
propagation delays and the master reset to
clock (RS) removal time.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines” .
Fig.14 Waveforms showing the output (Q
n
) to Q
n+1
propagation delays.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.