MITSUMI
System Reset (with built-in watchdog timer) MM1096
Electrical Characteristics (DC)
Item
MM1096A
T
PI
MM1096B
T
CKW
T
CK
T
WD
T
WR
T
PR
V
CC
CK
Symbol
V
CC
(Except where noted otherwise, MM1096A : V
CC
=3.6V, Ta=25°C, MM1096B : V
CC
=5.0V)
(Except where noted otherwise, resistance unit is
Ω)
Measurement conditions
3.6V
2.8V
5.0V
4.0V
or
Min.
8
Typ.
Max.
Units
V
CC
input
pulse width
µs
8
3
20
C
T
=0.02µF
C
T
=0.02µF
25
1
5
50
2
10
2
2.0
0.2
75
3
15
10
4.0
1.0
µs
µs
ms
ms
ms
µs
µs
µs
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
--------------------------------------------------------------------------
Output delay time from V
CC
4
*
T
PD
t
R
t
F
RESET pin, R
L
=10k, C
L
=20pF
--------------------------------------------------------------------------
Output rise time 5
*
Output fall time 5
*
RESET pin, R
L
=10k, C
L
=20pF
--------------------------------------------------------------------------
RESET pin, R
L
=10k, 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 (RESET output 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) = 500 C
T
(µF)
.
.
T
WD
(ms) = 2500 C
T
(µF)
.
. 100 C
T
(µF)
T
WR
(ms) =
.
Example : When C
T
=0.02µF
.
T
PR
= 10ms
.
. 50ms
T
WD
=
.
. 2ms
T
WR
=
.
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
