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POR/BOR characteristics
Unless otherwise specified: V
DD
Item
POR/BOR canceling voltage
POR/BOR detection voltage
POR/BOR hysteresis voltage
POR/BOR detection response time
POR/BOR operating limit voltage
POR/BOR reset request hold time
V
DD
V
OP
RST
V
SS
POR&BOR
X
REQ
reset request
t
RRQ
Note: When performing a power-on-reset again after the power is turned off, decrease the V
to V
OP or less.
RST
Reset hold circuit characteristics
Unless otherwise specified: V
DD
Item
Reset hold time
*1
*1 Time until the internal reset signal is negated after the reset request is canceled.
22.5 Clock Generator (CLG) Characteristics
Oscillator circuit characteristics including resonators change depending on conditions (board pattern, components
used, etc.). Use these characteristic values as a reference and perform matching evaluation using the actual printed
circuit board.
IOSC oscillator circuit characteristics
Unless otherwise specified: V
DD
Item
Oscillation start time
Oscillation frequency
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)
= 1.8 to 5.5 V, V
= 0 V, Ta = -40 to 85°C
SS
Symbol
V
RST+
V
RST-
DV
RST
t
RST
V
OP
RST
t
RRQ
t
t
RST
RST
V
V
V
RST-
RST-
REQ
t
RRQ
= 1.8 to 5.5 V, V
= 0 V, Ta = -40 to 85°C
SS
Symbol
t
RSTR
= 1.8 to 5.5 V, V
= 0 V, Ta = -40 to 85°C
SS
Symbol
t
staI
f
CLGIOSC.IOSCFQ[1:0] bits = 0x2,
IOSC
PWGACTL.REGSEL bit = 1
CLGIOSC.IOSCFQ[1:0] bits = 0x1,
PWGACTL.REGSEL bit = 1
CLGIOSC.IOSCFQ[1:0] bits = 0x0,
PWGACTL.REGSEL bit = 1
CLGIOSC.IOSCFQ[1:0] bits = 0x1,
PWGACTL.REGSEL bit = 0
CLGIOSC.IOSCFQ[1:0] bits = 0x0,
PWGACTL.REGSEL bit = 0
Seiko Epson Corporation
22 ELECTRICAL CHARACTERISTICS
Condition
t
RST
RST+
V
RST-
V
OP
RST
X
X
Indefinite (operating limit)
Condition
Condition
Min.
Typ.
Max.
1.41
–
1.75
1.25
–
1.55
40
60
–
–
–
20
–
0.5
0.95
0.01
–
4
V
RST+
V
OP
RST
REQ
X
t
RRQ
REQ
POR/BOR reset request
voltage
DD
Min.
Typ.
Max.
0.1
–
0.2
Min.
Typ.
Max.
–
–
3
7.2
8
8.4
1.8
2
2.1
0.9
1
1.05
1.62
1.8
1.89
0.78
0.9
1.02
Unit
V
V
mV
µs
V
ms
Unit
ms
Unit
µs
MHz
MHz
MHz
MHz
MHz
22-5
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