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參數(shù)資料
| 型號(hào)： | MM1142 |
| 廠商： | MITSUMI ELECTRIC |
| 英文描述： | System Reset (with built-in watchdog timer) |
| 中文描述： | 系統(tǒng)復(fù)位（內(nèi)置看門狗定時(shí)器） |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 135K |
| 代理商： | MM1142 |
MITSUMI
System Reset (with built-in watchdog timer) MM1142
Item
Symbol
Measurement conditions
2.6V
1.8V
T
CKW
Min.
Typ.
Max.
Units
V
CC
input pulse width
20
T
PI
μS
CK input pulse width
T
CKW
10
μS
CK input cycle
T
CK
50
μS
Watchdog timer
monitoring time
*
1
Watchdog timer
reset time
*
2
Reset hold time for
power supply rise
*
3
T
WD
C
T
=0.022μF
50
100
150
mS
T
WR
C
T
=0.022μF
1
2
3
mS
T
PR
C
T
=0.022μF
50
100
150
mS
------------------------------------------------------
delay time
t
PDR
t
PDB
t
RR
t
FR
t
RB
t
FB
V
CC
: High Low, R
LR
=100k
, C
LR
=15pF
V
CC
: High Low, R
LB
=10k
, C
LB
=15pF
R
LR
=100k
, C
LR
=15pF
R
LR
=100k
, C
LR
=15pF
R
LB
=10k
, C
LB
=15pF
R
LB
=10k
, C
LB
=15pF
10
10
10
2
10
2
μS
μS
μS
μS
μS
μS
BC delay time
------------------------------------------------------
rise time
------------------------------------------------------
fall time
BC rise time
BC fall time
V
CC
CK
CK T
CK
T
PI
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
SHR
) during power ON reset until
reset release (RESET
*
4 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.
Example : When C
T
=0.22F
T
PR
(mS)
~
-
4500 C
T
(μF)
T
PR
~
-
100mS
T
WD
(mS)
~
-
4500 C
T
(μF)
T
WD
~
-
100mS
T
WR
(mS)
~
-
90 C
T
(μF)
T
WR
~
-
2mS
*
5 T
WD
can be varied by placing a resistor (1M
or more)between the RCT pin and V
CC
.
*
6 The voltage range when measuring output rise and fall time is 10~90%.
*
7 V
CC
rise time should be 100μS or more, and fall time should be 50μS or more.
output high).
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