HEF4069UBP,652 데이터 시트보기 (PDF) - NXP Semiconductors.

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HEF4069UBP,652

Hex inverter

NXP Semiconductors. 

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:

T1

=

R 1 C 1 I n -V---D----D-----+-----V----S--T-

VST

T2

=

R1C1In

2----V----D---D-----–-----V----S--T-

VDD – VST

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.

VDD

A

1/6 HEF4069UB 1/6 HEF4069UB

D

A

B

VSS

C2 R2

R1

C

C1

B

C

Fig 7. Astable relaxation oscillator

D

forward voltage

clamping diode

VDD

0V

VDD

0V

1.5VDD

VDD

0.5VDD

0V

−0.5VDD

VDD

0.5VDD

0V

001aag162

HEF4069UB

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 8 — 16 November 2011

© NXP B.V. 2011. All rights reserved.

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