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74HC4060 датащи(PDF) 11 Page - NXP Semiconductors

номер детали 74HC4060
подробное описание детали  14-stage binary ripple counter with oscillator
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
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74HC4060 датащи(HTML) 11 Page - NXP Semiconductors

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December 1990
11
Philips Semiconductors
Product specification
14-stage binary ripple counter with oscillator
74HC/HCT4060
Fig.7
Test set-up for measuring forward
transconductance gfs =dio / dvi at vo is
constant (see also graph Fig.8);
MR = LOW.
handbook, halfpage
MBA333
14
12
10
8
6
4
2
0123
456
g
fs
(mA/V)
CC
V
(V)
max.
min.
typ.
Fig.8
Typical forward transconductance gfs as a
function of the supply voltage VCC at
Tamb =25 °C.
Fig.9
RC oscillator frequency as a function of
Rt and Ct at VCC = 2.0 to 6.0 V; Tamb =25 °C.
Ct curve at Rt = 100 kΩ; R2 = 200 kΩ.
Rt curve at Ct = 1 nF; R2 = 2 × Rt.
RC OSCILLATOR
Fig.10 Example of a RC oscillator.
Typical formula for oscillator frequency:
f
osc
1
2.5
R
t
C
t
×
×
--------------------------------
=
TIMING COMPONENT LIMITATIONS
The oscillator frequency is mainly determined by RtCt, provided R2 ≈ 2Rt and R2C2 << RtCt. The function of R2 is to
minimize the influence of the forward voltage across the input protection diodes on the frequency. The stray capacitance
C2 should be kept as small as possible. In consideration of accuracy, Ct must be larger than the inherent stray
capacitance. Rt must be larger than the “ON” resistance in series with it, which typically is 280 Ω at VCC = 2.0 V, 130 Ω at
VCC = 4.5 V and 100 Ω at VCC = 6.0 V.
The recommended values for these components to maintain agreement with the typical oscillation formula are:
Ct > 50 pF, up to any practical value,
10 k
Ω< Rt < 1 MΩ.
In order to avoid start-up problems, Rt ≥ 1 kΩ.


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