參數(shù)資料
型號: 74LV4060
廠商: NXP Semiconductors N.V.
元件分類: 通用總線功能
英文描述: 14-stage binary ripple counter with oscillator(帶振蕩器的14級二進制紋波計數(shù)器)
中文描述: 14級的振蕩器(帶振蕩器的14級二進制紋波計數(shù)器二進制紋波計數(shù)器)
文件頁數(shù): 11/18頁
文件大?。?/td> 165K
代理商: 74LV4060
Philips Semiconductors
Product specification
74LV4060
14-stage binary ripple counter with oscillator
1998 Jun 23
11
SV00732
C
t
C2
R2
RS
11
R
t
R
TC
10
C
TC
9
Figure 3.
Example of an RC oscillator. Typical formula for oscillator frequency:
1
2.5 x R
t
x C
t
f
OSC
SV00328
10
–2
C
t
( F) 10
–1
R
t
( )
10
3
10
10
2
10
3
10
5
10
4
f
(Hz)
10
–4
10
4
10
–3
10
5
10
6
Figure 4.
RC oscillator frequency as a function of R
t
and C
t
at
V
CC
= 1.2 to 3.6 V; T
amb
= 25 C.
C
t
curve at R
t
= 100 k ; R2 = 200 k .
R
t
curve at C
t
= 1 nF; R2 = 2 x R
t
.
TIMING COMPONENTS LIMITATIONS
The oscillator frequency is mainly determined by R
t .
C
t
, provided R2
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, C
t
must be larger than the inherent stray capacitance. R
t
must be larger than the ’ON’ resistance in
series with it, which typically is 280 at V
CC
= 1.2 V, 130 at V
CC
= 2.0 V and 100 at V
CC
3.0 V. The recommended values for these
components to maintain agreement with the typical oscillation formula are: C
t
50pF, up to any practical value, 10 k R
t
1 M
avoid start-up problems, R
t
1 k .
2R
t
and R2
.
C2
R
t .
C
t
. The function of R2 is to minimize the
In order to
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