hef4069ub NXP Semiconductors, hef4069ub Datasheet - Page 5

• Manufacturer Part Number: hef4069ub
• Description: Hex Inverter
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
Some examples of applications for the HEF4069UB are shown below.
In Fig.7 an astable relaxation oscillator is given. The oscillation frequency is mainly determined by R1C1, provided
R1 << R2 and R2C2 << R1C1.
January 1995
Hex inverter
The function of R2 is to minimize the influence of the forward voltage across
the protection diodes on the frequency; C2 is a stray (parasitic) capacitance.
The period T
V
of V
Fig.7
ST
T
DD
is the signal threshold level of the inverter. The period is fairly independent
(a)
(b)
1
, V
=
ST
R1C1 In
(a) Astable relaxation oscillator using two HEF4069UB inverters; the diodes may be BAW62; C2 is a
parasitic capacitance. (b) Waveforms at the points marked A, B, C and D in the circuit diagram.
and temperature. The duty factor, however, is influenced by V
p
is given by T
---------------------------- - and T
V
DD
V
ST
+
V
p
ST
= T
1
+ T
2
2
, in which
=
R1C1 In
--------------------------------- - where
2 V
V
DD
DD
–
–
V
V
ST
ST
ST
5
.
HEF4069UB
Product specification
gates