HEF4069UBT652 datasheet(8/17 Pages) NXP

Part #	HEF4069UBT652

Description	Hex inverter Rev. 8 ??16 November 2011

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Manufacturer	NXP [NXP Semiconductors]

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HEF4069UB

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Product data sheet

Rev. 8 — 16 November 2011

8 of 17

NXP Semiconductors

HEF4069UB

Hex inverter

12. Application information

Some examples of applications for the HEF4069UB.

Figure 7 shows an astable relaxation oscillator using two HEF4069UB inverters and 2

BAW62 diodes. The oscillation frequency is mainly determined by R1

 C1, provided

R1 << R2 and R2

 C2 << R1  C1.

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 Tp is given by Tp =T1 +T2,

where:

VST = the signal threshold level of the inverter.

The period is fairly independent of VDD, VST and temperature. The duty factor, however, is

influenced by VST.

T

1

R1C1In

V

DD

V

ST

+

V

ST

--------------------------

=

T

2

R1C1In

2V

DD

V

ST

–

V

DD

V

ST

–

-----------------------------

=

Fig 7.

Astable relaxation oscillator

001aag162

forward voltage

clamping diode

D

C

B

A

C2

C1

B

A

C

D

R2

R1

VDD

0 V

VDD

0 V

1.5VDD

VDD

0.5VDD

0 V

−0.5VDD

VDD

0.5VDD

0 V

VSS

1/6 HEF4069UB

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