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參數(shù)資料
| 型號： | MM1075 |
| 廠商： | MITSUMI ELECTRIC |
| 英文描述： | System Reset (with built-in watchdog timer) Monolithic IC |
| 中文描述： | 系統(tǒng)復(fù)位（內(nèi)置看門狗定時器）單片集成電路 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 241K |
| 代理商： | MM1075 |
MITSUMI
System Reset (with built-in watchdog timer) MM1075
Electrical Characteristics (AC)
(Except where noted otherwise, Ta=25°C, V
CC
=5V)
Item
Symbol
Measurement
circuit
Measurement conditions
Min. Typ. Max.
Units
V
CC
input pulse width
T
P
1
2
8
μS
CK input pulse width
CK input cycle
Watchdog timer
monitoring time
*
2
Reset time for
watchdog timer
*
3
Reset hold time for
power supply rise
*
4
Output delay time
from V
CC
*
5
T
CKW
T
CK
2
2
3
μS
μS
20
T
WD
2
C
T
=0.1μF
R
CT
=OPEN
50
100
150
mS
T
WR
2
C
T
=0.1μF
1
2
3
mS
T
PR
2
50
100
150
mS
T
PD
1
2
RESET pin
R
L
1=2.2k
, C
L
1=100pF
RESET pin
R1, 2=10k
, C
L
2=20pF
RESET pin
R
L
1=2.2k
, C
L
1=100pF
RESET pin
R
L
2=10k
, C
L
2=20pF
RESET pin
R
L
1=2.2k
, C
L
1=100pF
RESET pin
R
L
2=10k
, C
L
2=20pF
2
10
μS
T
PD
2
2
3
10
t
R
1
2
Output rise time
*
6
1.0
1.5
μS
t
R
2
2
1.0
1.5
μS
t
F
1
2
Output fall time
*
6
0.1
0.5
μS
t
F
2
2
0.5
1.0
μS
V
CC
5V
4V
Notes:
*
1 I
CT
1 changes according to R
CT
pin (Pin 6) pull up resistance.
*
2 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. Also,
monitoring time can be varied by pulling up the R
CT
pin to V
CC
with a resistor (R
CT
). Monitoring time
adjustments are shown in Graph 1.
*
3 Reset time means reset pulse width. However, this does not apply to power ON reset.
*
4 Reset hold time is the time from when V
CC
exceeds detection voltage (V
SH
) during power ON reset until
reset release (RESET
*
5 Output delay time is the time from when power supply voltage drops below detection voltage (V
SI
) until
reset (RESET
*
6 Voltage range when measuring output rise and fall is 10~90%.
*
7 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. The recommended range for C
T
is 0.001~10μF.
output high, RESET output low).
output low, RESET output high).
T
PR
(mS)
~
-
1000 C
T
(μF)
T
WD
(mS)
~
-
1000 C
T
(μF)
T
WR
(mS)
~
-
20 C
T
(μF)
Example : When C
T
=0.1μF (R
CT
pin OPEN)
T
PR
~
-
100mS
T
WD
~
-
100mS
T
WR
~
-
2mS
CK
or
C
T
=0.1μF, V
CC
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