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| 型號(hào)： | 74HC4060 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | 14-stage binary ripple counter with oscillator |
| 中文描述： | 14級(jí)的振蕩器二進(jìn)制紋波計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 90K |
| 代理商： | 74HC4060 |
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 g
fs
= di
o
/ dv
i
at v
o
is
constant (see also graph Fig.8);
MR = LOW.
handbook, halfpage
(mA/V)
MBA333
12
10
8
6
4
20
1
2
3
4
5
6
CC
V
(V)
max.
min.
typ.
Fig.8
Typical forward transconductance g
fs
as a
function of the supply voltage V
CC
at
T
amb
= 25
°
C.
Fig.9
RC oscillator frequency as a function of
R
t
and C
t
at V
CC
= 2.0 to 6.0 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
×
R
t
.
RC OSCILLATOR
Fig.10 Example of a RC oscillator.
Typical formula for oscillator frequency:
R
t
C
t
f
osc
×
×
2.5
=
TIMING COMPONENT LIMITATIONS
The oscillator frequency is mainly determined by R
t
C
t
, provided R2
≈
2R
t
and R2C2 << R
t
C
t
. 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, 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
= 2.0 V, 130
at
V
CC
= 4.5 V and 100
at V
CC
= 6.0 V.
The recommended values for these components to maintain agreement with the typical oscillation formula are:
C
t
>
50 pF, up to any practical value,
10 k
<
R
t
<
1 M
.
In order to avoid start-up problems, R
t
≥
1 k
.
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