S1C88650 TECHNICAL MANUAL EPSON 149
8 ELECTRICAL CHARACTERISTICS
8.7 Oscillation Characteristics
Oscillation characteristics change depending on conditions (board pattern, components used, etc.). Use the
following characteristics as reference values. In particular, when a ceramic oscillator or crystal oscillator is
used for OSC3, use the oscillator manufacturer’s recommended values for constants such as capacitance
and resistance. The oscillation start time is important because it becomes the wait time when OSC3 clock is
used. (If OSC3 is used as CPU clock before oscillation stabilizes, the CPU may malfunction.)
■ OSC1 (Crystal)
Item
Symbol
Min. Typ. Max. UnitCondition
Oscillation start time
External gate capacitance
Built-in drain capacitance
Frequency/IC deviation
Frequency/power voltage deviation
Frequency adjustment range
t
sta
C
G1
C
D1
∂
f/
∂
IC
∂
f/
∂
V
∂
f/
∂
C
G
5
-10
25
10
3
25
10
1
s
pF
pF
ppm
ppm/V
ppm
Including board capacitance
In case of the chip
V
DD
= constant
V
DD
= constant, C
G
= 5 to 25 pF
Note
Unless otherwise specified: V
DD
= 1.8 to 3.6 V, V
SS
= 0 V, Ta = 25°C,
Crystal oscillator = Q12C2000 (R
i
= 30 kΩ Typ.)*, C
G1
= 25 pF, C
D1
= Built-in
* Q12C2000 Made by Seiko Epson corporation
■ OSC1 (CR)
Min. Typ. Max.
t
sta
∂f/∂IC -25
100
25
µs
%R
CR
= constant
Oscillation start time
Frequency/IC deviation
Item
Symbol
UnitCondition Note
Unless otherwise specified: V
DD
= 1.8 to 3.6 V, V
SS
= 0 V, Ta = 25°C
■ OSC3 (Crystal)
Min. Typ. Max.
Oscillation start time
t
sta 10 ms 1
Item
Symbol
UnitCondition Note
Unless otherwise specified: V
DD
= 1.8 to 3.6 V, V
SS
= 0 V, Ta = 25°C,
Crystal oscillator = Q21CA301*, R
F
= 1 MΩ, C
G2
= C
D2
= 15 pF
Note)
*
1
Q21CA301 Made by Seiko Epson corporation
The crystal oscillation start time changes by the crystal oscillator to be used, C
G2
and C
D2
.
■ OSC3 (Ceramic)
Min. Typ. Max.
t
sta 1 ms 1
Oscillation start time
Item
Symbol
UnitCondition Note
Unless otherwise specified: V
DD
= 1.8 to 3.6 V, V
SS
= 0 V, Ta = 25°C,
Ceramic oscillator = KBR-4.0MSB/KBR-8.0MSB*, R
F
= 1 MΩ, C
G2
= C
D2
= 30 pF
*
1Note)
KBR-4.0MSB/KBR-8.0MSB Made by Kyocera
The ceramic oscillation start time changes by the ceramic oscillator to be used, C
G2
and C
D2
.
■ OSC3 (CR)
Min. Typ. Max.
t
sta
∂
f/
∂
IC -25
100
25
µs
%R
CR
= constant
Oscillation start time
Frequency/IC deviation
Item
Symbol
UnitCondition Note
Unless otherwise specified: V
DD
= 1.8 to 3.6 V, V
SS
= 0 V, Ta = 25°C
