4069UB View Datasheet(PDF) - Philips Electronics

Part Name

Description

View to exact match

4069UB

Hex inverter

Philips Electronics 

Philips Semiconductors

Hex inverter

Product specification

HEF4069UB

gates

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.

(a)

(b)

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, in which

T1 = R1C1 In --V----D----DV----S-+---T--V----S---T- and T2 = R1C1 In--2--V---V-D---D-D---D-–----–-V---V-S---ST----T- where

VST is 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.

Fig.7 (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.

January 1995

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