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| 型號(hào)： | 933324260652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 門電路 |
| 英文描述： | 4000/14000/40000 SERIES, HEX 1-INPUT INVERT GATE, PDIP14 |
| 封裝： | PLASTIC, SOT-27-1, DIP-14 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 115K |
| 代理商： | 933324260652 |
January 1995
5
Philips Semiconductors
Product specication
Hex inverter
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.
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.
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
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.
T
1
R1C1 In
V
DD
V
ST
+
V
ST
-----------------------------
and T
2
R1C1 In
2V
DD
V
ST
–
V
DD
V
ST
–
----------------------------------
where
=
(a)
(b)
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