MITSUMI
System Reset (with built-in watchdog timer) MM1095
Electrical Characteristics (DC)
Item
MM1095A
T
PI
MM1095B
T
CKW
T
CK
T
WD
T
WR
T
PR
T
PD
t
R
t
F
V
CC
CK
Symbol
V
CC
(Except where noted otherwise, MM1095A : V
CC
=3.6V, Ta=25°C, MM1095B : V
CC
=5.0V)
Min.
8
µS
8
or
3
20
C
T
=0.02µF
C
T
=0.02µF
5
1
50
10
2
100
2
2.0
0.2
15
3
150
10
4.0
1.0
µS
µS
mS
mS
mS
µS
µS
µS
Typ.
Max.
Units
Measurement conditions
3.6V
2.8V
5.0V
4.0V
V
CC
input
pulse width
CK input pulse width
CK input cycle
Watchdog timer
monitoring time 1
*
Reset time for
watchdog timer 2
*
Reset hold time for
power supply rise 3
*
C
T
=0.02µF, V
CC
-------------------------------------------------------------------------------
V
CC
Output delay time from V
CC
4
*
RESET pin, R
L
=10kΩ, C
L
=20pF
-------------------------------------------------------------------------------
Output rise time 5
*
Output fall time 5
*
RESET pin, R
L
=10kΩ, C
L
=20pF
-------------------------------------------------------------------------------
RESET pin, R
L
=10kΩ, C
L
=20pF
Notes:
1 Monitoring time is the time from the last pulse (negative edge) of the timer clear clock pulse until reset
pulse output. In other words, reset output is output if a clock pulse is not input during this time.
2 Reset time means reset pulse width. However, this does not apply to power ON reset.
3 Reset hold time is the time from when V
CC
exceeds detection voltage (V
SH
) during power ON reset until
reset release (RESET output high).
4 Output delay time is the time from when power supply voltage drops below detection voltage (V
SL
) until
reset (RESEToutput low).
5 Voltage range when measuring output rise and fall is 10~90%.
6 Watchdog timer monitoring time (T
WD
), watchdog timer reset time (T
WR
) and reset hold time (T
PR
) during
power supply rise can be changed by varying C
T
capacitance. The times are expressed by the following
formulae.
*
*
*
*
*
*
----------------------------------------
---------------------------------------
.
T
PR
(mS) = 5000 C
T
(µF)
.
. 500 C
T
(µF)
T
WD
(mS) =
.
. 100 C
T
(µF)
T
WR
(mS) =
.
Example: When C
T
=0.02µF
T
PR
. . 100mS
=
T
WD
. . 10mS
=
T
WR
. . 2mS
=
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
