22 ELECTRICAL CHARACTERISTICS
S1C31D50/D51 TECHNICAL MANUAL
Seiko Epson Corporation
22-7
(Rev. 2.00)
OSC3 oscillator circuit characteristics
Unless otherwise specified: V
DD
= 1.8 to 5.5 V, V
SS
= 0 V, Ta = 25
°
C
Item
Symbol
Condition
Ta
Min.
Typ.
Max.
Unit
Crystal/ceramic oscillator
oscillation start time
t
sta3C
CLGOSC3.OSC3MD bit = 1, Crystal resonator
–
–
20
ms
CLGOSC3.OSC3MD bit = 1, Ceramic resonator
–
–
1
ms
Crystal/ceramic oscillator
internal gate capacitance
C
GI3C
CLGOSC3.OSC3MD bit = 1
–
5
–
pF
Crystal/ceramic oscillator
internal drain capacitance
C
DI3C
CLGOSC3.OSC3MD bit = 1
–
5
–
pF
Internal oscillator
oscillation start time
t
sta3I
CLGOSC3.OSC3MD bit = 0
–
–
3
µs
Internal oscillator
oscillation frequency
f
OSC3I
CLGOSC3.OSC3MD bit = 0,
CLGOSC3.OSC3FQ[1:0] bits = 0x3
0 to 50
°
C
15.68
16
16.32
MHz
-20 to 60
°
C
15.60
16
16.40
MHz
-40 to 85
°
C
15.44
16
16.56
MHz
CLGOSC3.OSC3MD bit = 0,
CLGOSC3.OSC3FQ[1:0] bits = 0x1
-40 to 85
°
C
7.7
8.3
8.9
MHz
CLGOSC3.OSC3MD bit = 0,
CLGOSC3.OSC3FQ[1:0] bits = 0x0
-40 to 85
°
C
3.8
4.2
4.6
MHz
CLGOSC3.OSC3MD bit = 0,
CLGOSC3.OSC3FQ[1:0] bits = 0x3
*
1
15.84
16
16.16
MHz
*
1 Corrected value immediately after the auto-trimming operation has completed.
OSC3 internal oscillation frequency-temperature characteristic
Typ. value
-50
18
16
14
12
10
8
6
4
2
0
-25
0
25
50
75
100
Ta [
°
C]
f
OSC3I
[k
Hz
]
CLGOSC3.OSC3FQ[1:0] bits = 0x3
0x1
0x0
EXOSC external clock input characteristics
Unless otherwise specified: V
DD
= 1.8 to 5.5 V, V
SS
= 0 V, Ta = -40 to 85
°
C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
EXOSC external clock duty ratio
t
EXOSCD
t
EXOSCD
= t
EXOSCH
/t
EXOSC
46
–
54
%
High level Schmitt input threshold voltage V
T+
0.5
×
V
DD
–
0.8
×
V
DD
V
Low level Schmitt input threshold voltage V
T-
0.2
×
V
DD
–
0.5
×
V
DD
V
Schmitt input hysteresis voltage
D
V
T
180
–
–
mV
EXOSC
t
EXOSCH
t
EXOSC
= 1/f
EXOSC
V
T+
V
T+
V
T-
t
EXOSCH
t
EXOSC
= 1/f
EXOSC
V
T+
V
T+
V
T-