HEF4060BN PHILIPS [NXP Semiconductors], HEF4060BN Datasheet - Page 6

• Manufacturer Part Number: HEF4060BN
• Description: 14-stage ripple-carry binary counter/divider and oscillator
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Timing component limitations
The oscillator frequency is mainly determined by
R
of R2 is to minimize the influence of the forward voltage
across the input protection diodes on the frequency. The
stray capacitance C2 should be kept as small as possible.
In consideration of accuracy, C
inherent stray capacitance. R
LOCMOS ‘ON’ resistance in series with it, which typically
is 500
V
The recommended values for these components to
maintain agreement with the typical oscillation formula are:
C
10 k
Typical crystal oscillator circuit
In Fig.5, R2 is the power limiting resistor. For starting and
maintaining oscillation a minimum transconductance is
necessary.
January 1995
DD
t
t
C
14-stage ripple-carry binary counter/divider
and oscillator
Fig.6
t
, provided R
= 15 V.
100 pF, up to any practical value,
R
at V
t
Test set-up for measuring forward transconductance g
MR = LOW.
DD
1 M .
= 5 V, 300
t
<< R2 and R2C2 << R
t
at V
must be larger than the
t
must be larger than the
DD
= 10 V and 200
t
C
t
. The function
at
6
Fig.5
fs
= di
o
/dv
External component connection for crystal
oscillator.
i
at v
o
is constant (see also graph Fig.7);
Product specification
HEF4060B
MSI