mm1075 Mitsumi Electronics, Corp., mm1075 Datasheet - Page 3

• Manufacturer Part Number: mm1075
• Description: Ic For System Reset With Built-in Watchdog Timer
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
Electrical Characteristics (AC)
Notes:
*
*
*
*
*
*
*
1 I
2 Monitoring time is the time from the last pulse (negative edge) of the timer clear clock pulse until reset
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
5 Output delay time is the time from when power supply voltage drops below detection voltage (V
6 Voltage range when measuring output rise and fall is 10~90%.
7 Watchdog timer monitoring time (T
V
CK input pulse width
power supply rise
monitoring time
watchdog timer
Reset hold time for
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
adjustments are shown in Graph 1.
reset release (RESET
reset (RESET
power supply rise can be changed by varying C
formulae. The recommended range for C
CC
Output delay time
CT
Output rise time
Watchdog timer
Output fall time
CK input cycle
Reset time for
1 changes according to R
input pulse width
from V
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Item
*
*
*
5
6
6
CC
T
T
T
Example : When C
output low, RESET output high).
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
PR
WD
WR
(ms) ~
*
*
(ms) ~
(ms) ~
T
T
T
*
3
2
PR
WD
WR
4
- 1000
output high, RESET output low).
- 1000
- 20
~
- 100ms
~
- 2ms
~
- 100ms
Symbol
T
T
T
T
T
T
T
T
t
t
t
t
CKW
PD
PD
R
R
F
F
WD
WR
P
CK
PR
1
2
1
2
1
1
2
CT
C
pin (Pin 6) pull up resistance.
T
T
Measurement
C
=0.1µF (R
C
(µF)
T
T
circuit
WD
(µF)
(µF)
2
2
2
2
2
2
2
2
2
2
2
2
), watchdog timer reset time (T
CC
(Except where noted otherwise, Ta=25°C, V
(Except where noted otherwise, resistance unit is Ω)
T
CT
is 0.001~10µF.
exceeds detection voltage (V
pin OPEN)
V
IC for System Reset (with built-in watchdog timer) MM1075
CK
C
CC
T
T
=0.1µF, V
Measurement conditions
capacitance. The times are expressed by the following
CT
5V
4V
R
R
R
pin to V
R1, 2=10k, C
R
R
L
L
L
1=2.2k, C
1=2.2k, C
1=2.2k, C
L
L
2=10k, C
2=10k, C
R
RESET pin
RESET pin
RESET pin
RESET pin
RESET pin
RESET pin
CC
C
C
CT
T
T
CC
=OPEN
=0.1µF
=0.1µF
or
with a resistor (R
L
L
L
L
L
1=100pF
1=100pF
1=100pF
L
2=20pF
2=20pF
2=20pF
WR
) and reset hold time (T
SH
) during power ON reset until
CC
=5V)
CT
Min. Typ. Max. Units
). Monitoring time
20
50
50
8
3
1
100
100
1.0
1.0
0.1
0.5
2
2
3
PR
150
150
1.5
1.5
0.5
1.0
10
10
3
) during
SI
) until
ms
ms
ms
µs
µs
µs
µs
µs
µs
µs
µs