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參數(shù)資料
| 型號(hào)： | 933507870652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 門電路 |
| 英文描述： | 4000/14000/40000 SERIES, QUAD 2-INPUT NOR GATE, PDIP14 |
| 封裝： | PLASTIC, SOT-27-1, DIP-14 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大小： | 133K |
| 代理商： | 933507870652 |
January 1995
6
Philips Semiconductors
Product specication
Quadruple 2-input NOR gate
HEF4001UB
gates
APPLICATION INFORMATION
Some examples of applications for the HEF4001UB are shown below. Because of the fact that this circuit is unbuffered,
it is suitable for use in (partly) analogue circuits.
Fig.9
(a) Astable relaxation oscillator using two HEF4001UB gates; 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.
INH
O
HL
L
OSC
In Fig.9 the oscillation frequency is mainly determined by R1C1, provided
R1 << R2 and R2C2 << R1C1.
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 gate. The period is fairly
independent of VDD, VST and temperature. The duty factor, however, is
influenced by VST.
T
1
R1C1 ln
V
DD
V
ST
+
V
ST
---------------------------
and T
2
R1C1 ln
2V
DD
V
ST
–
V
DD
V
ST
–
---------------------------------
where
=
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