Datasheet
MOTOROLA CMOS LOGIC DATAMC14060B
4
Figure 3. Oscillator Circuit Using RC Configuration
CLOCK 11
RESET
R
S
C
tc
R
tc
10 OUT 1
9 OUT 2
f
1
2.3R
tc
C
tc
if 1 kHz ≤ f ≤ 100 kHz
and 2R
tc
< R
S
< 10R
tc
(f in Hz, R in ohms, C in farads)
The formula may vary for other frequencies. Recommended
maximum value for the resistors in 1 MΩ.
TYPICAL RC OSCILLATOR CHARACTERISTICS
Figure 4. RC Oscillator Stability Figure 5. RC Oscillator Frequency as a
Function of R
TC
and C
–8.0
–12
–16
–4.0
0
4.0
8.0
1251007550250– 25–55
T
A
, AMBIENT TEMPERATURE (
°
C)
FREQUENCY DEVIATION (%)
V
DD
= 15 V
1.0 V
5.0 V
R
TC
= 56 k
Ω
C = 1000 pF
R
S
= 0, f = 10.15 kHz @ V
DD
= 10, T
A
= 25
°
C
R
S
= 120 k
Ω
, f = 7.8 kHz @ V
DD
= 10 V, T
A
= 25
°
C
f, OSCILLATOR FREQUENCY (kHz)
100
50
20
10
5
2
1
0.5
0.2
0.1
1.0 k 10 k 100 k 1.0 M
R
TC
, RESISTANCE (OHMS)
0.0001 0.001 0.01 0.1
C, CAPACITANCE (
µ
F)
V
DD
= 10 V
f AS A FUNCTION
OF R
TC
(C = 1000 pF)
(R
S
≈
2R
TC
)
f AS A FUNCTION
OF C
(R
TC
= 56 k
Ω
)
(R
S
= 120 k)
Figure 6. Typical Crystal Oscillator Circuit
CLOCK
11
RESET
9 OUT 210 OUT 1
18M
R
O
C
S
C
T
Characteristic
500 kHz
Circuit
32 kHz
Circuit
Unit
Crystal Characteristics
Resonant Frequency
Equivalent Resistance, R
S
500
1.0
32
6.2
kHz
kΩ
External Resistor/Capacitor Values
R
O
C
T
C
S
47
82
20
750
82
20
kΩ
pF
pF
Frequency Stability
Frequency Changes as a Function
of V
DD
(T
A
= 25 C)
V
DD
Change from 5.0 V to 10V
V
DD
Change from 10 V to 15 V
Frequency Change as a Function
of Temperature (V
DD
= 10 V)
T
A
Change from – 55 Cto
+25 C Complete Oscillator*
T
A
Change from + 25 C to
+125 C Complete Oscillator*
+ 6.0
+ 2.0
+ 100
– 160
+ 2.0
+ 2.0
+ 120
– 560
ppm
ppm
ppm
ppm
* Complete oscillator includes crystal, capacitors, and resistors.
Figure 7. Typical Data for Crystal Oscillatgor Circuit