22 ELECTRICAL CHARACTERISTICS
S1C31D50/D51 TECHNICAL MANUAL
Seiko Epson Corporation
22-5
(Rev. 2.00)
POR/BOR 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
POR/BOR canceling voltage
V
RST+
1.41
–
1.75
V
POR/BOR detection voltage
V
RST-
1.25
–
1.55
V
POR/BOR hysteresis voltage
D
V
RST
40
60
–
mV
POR/BOR detection response time
t
RST
–
–
20
µs
POR/BOR operating limit voltage
V
RST
OP
–
0.5
0.95
V
POR/BOR reset request hold time
t
RRQ
0.01
–
4
ms
POR&BOR
reset request
V
DD
V
SS
V
RST
OP
V
RST-
V
RST-
V
RST-
V
RST+
Indefinite (operating limit)
POR/BOR reset request
t
RRQ
X
X
X
REQ
REQ
t
RRQ
REQ
t
RRQ
t
RST
t
RST
t
RST
X
V
RST
OP
V
RST
OP
V
RST+
REQ
∆
V
RST
Note: When performing a power-on-reset again after the power is turned off, decrease the V
DD
voltage
to V
RST
OP or less.
Reset hold circuit 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
Reset hold time
*
1
t
RSTR
0.1
–
0.2
ms
*
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
= 1.8 to 5.5 V, V
SS
= 0 V, Ta = -40 to 85
°
C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Oscillation start time
t
staI
–
–
3
µs
Oscillation frequency
f
IOSC
CLGIOSC.IOSCFQ[1:0] bits = 0x2,
PWGACTL.REGSEL bit = 1
7.2
8
8.4
MHz
CLGIOSC.IOSCFQ[1:0] bits = 0x1,
PWGACTL.REGSEL bit = 1
1.8
2
2.1
MHz
CLGIOSC.IOSCFQ[1:0] bits = 0x0,
PWGACTL.REGSEL bit = 1
0.9
1
1.05
MHz
CLGIOSC.IOSCFQ[1:0] bits = 0x1,
PWGACTL.REGSEL bit = 0
1.62
1.8
1.89
MHz
CLGIOSC.IOSCFQ[1:0] bits = 0x0,
PWGACTL.REGSEL bit = 0
0.78
0.9
1.02
MHz