System Reset (with built-in watchdog timer) MM1096
MITSUMI
(Except where noted otherwise, MM1096A : VCC=3.6V, Ta=25°C, MM1096B : VCC=5.0V)
(Except where noted otherwise, resistance unit is Ω)
Electrical Characteristics (DC)
Item
Symbol
Measurement conditions
Min. Typ. Max.
Units
3.6V
2.8V
5.0V
4.0V
MM1096A
MM1096B
8
VCC
VCC
VCC input
pulse width
TPI
µs
8
CK input pulse width
CK input cycle
TCKW
TCK
3
µs
µs
CK
or
20
Watchdog timer
TWD
TWR
TPR
CT=0.02µF
CT=0.02µF
25
1
50
2
75
3
ms
ms
ms
monitoring time 1
*
Reset time for
watchdog timer 2
*
Reset hold time for
5
10
15
CT=0.02µF, VCC
power supply rise
3
*
--------------------------------------------------------------------------
Output delay time from VCC
4
TPD
tR
RESET pin, RL=10k, CL=20pF
2
10
4.0
1.0
µs
µs
µs
*
--------------------------------------------------------------------------
Output rise time 5
RESET pin, RL=10k, CL=20pF
--------------------------------------------------------------------------
2.0
0.2
*
Output fall time 5
tF
RESET pin, RL=10k, CL=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 VCC exceeds detection voltage (VSH) 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 (VSL) until
*
reset (-R----------E---------S----------E---------T-------- output low).
5 Voltage range when measuring output rise and fall is 10~90%.
6 Watchdog timer monitoring time (TWD), watchdog timer reset time (TWR) and reset hold time (TPR) during
power supply rise can be changed by varying CT capacitance. The times are expressed by the following
formulae.
*
*
.
TPR (ms) = 500 CT (µF)
.
.
TWD (ms) = 2500 CT (µF)
.
.
TWR (ms) = 100 CT (µF)
.
Example : When CT=0.02µF
.
TPR = 10ms
.
.
TWD = 50ms
.
.
TWR = 2ms
.
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
