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8.0
4.0
0
– 4.0
– 8.0
– 12
R TC = 56 kΩ,
R S = 0, f = 10.15 kHz @ V DD = 10 V, T A = 25 C
C = 1000 pF
R S = 120 kΩ, f = 7.8 kHz @ V DD = 10 V, T A = 25 C
– 16
– 55
– 25
0
25
* Device Only.
T A , AMBIENT TEMPERATURE ( C)*
Figure 1. RC Oscillator Stability
100
FORMULA FOR CALCULATING t W IN
MICROSECONDS IS AS FOLLOWS:
t W = 0.00247 R X C X 0.85
WHERE R IS IN kΩ, C X IN pF.
10
R X = 100 kΩ
50 kΩ
1.0
10 kΩ
5 kΩ
0.1
1.0
10
C X , EXTERNAL CAPACITANCE (pF)
Figure 3. Typical C X versus Pulse Width
@ V DD = 5.0 V
MC14536B
6–360
TYPICAL RC OSCILLATOR CHARACTERISTICS
(For Circuit Diagram See Figure 11 In Application)
V DD = 15 V
10 V
5.0 V
50
75
100
125
MONOSTABLE CHARACTERISTICS
(For Circuit Diagram See Figure 10 In Application)
T A = 25 C
V DD = 5 V
100
1000
100
FORMULA FOR CALCULATING t W IN
MICROSECONDS IS AS FOLLOWS:
t W = 0.00247 R X C X 0.85
WHERE R IS IN kΩ, C X IN pF.
10
R X = 100 kΩ
50 kΩ
1.0
10 kΩ
5 kΩ
0.1
1.0
10
C X , EXTERNAL CAPACITANCE (pF)
Figure 5. Typical C X versus Pulse Width
@ V DD = 15 V
100
V DD = 10 V
50
20
10
5.0
f AS A FUNCTION
2.0
OF C
1.0
(R TC = 56 kΩ)
(R S = 120 k)
0.5
0.2
0.1
1.0 k
10 k
R TC , RESISTANCE (OHMS)
0.0001
0.001
C, CAPACITANCE (µF)
Figure 2. RC Oscillator Frequency as a
Function of R TC and C
100
FORMULA FOR CALCULATING t W IN
MICROSECONDS IS AS FOLLOWS:
t W = 0.00247 R X C X 0.85
WHERE R IS IN kΩ, C X IN pF.
10
R X = 100 kΩ
50 kΩ
1.0
10 kΩ
5 kΩ
0.1
1.0
10
C X , EXTERNAL CAPACITANCE (pF)
Figure 4. Typical C X versus Pulse Width
@ V DD = 10 V
T A = 25 C
V DD = 15 V
100
1000
MOTOROLA CMOS LOGIC DATA
f AS A FUNCTION
OF R TC
(C = 1000 pF)
(R S 2R TC )
100 k
1.0 M
0.01
0.1
T A = 25 C
V DD = 10 V
100
1000
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