MITSUMI
System Reset (with watchdog timer+battery back-up) MM1106
Outline
This IC combines the popular watchdog timer with a battery back-up, resulting in an IC that is easier to use.
The watchdog timer has a built-in power ON reset function, and both the timer and the battery back-up
section have low current consumption.
Features
1. Low current consumption
270A typ.
2. Watchdog timer
Detection voltage
4.2V typ.
C
T
charging current
-0.24A typ.
3. CS
CS detection voltage
4.4V typ.
Output voltage low level
0.1V typ.
4. Battery back-up
Power supply switching voltage
3.3V typ.
Input/output voltage difference (normal)
0.3V typ.
Input/output voltage difference (back-up)
0.3V typ.
Loss current (current consumption for back-up)
0.1A typ.
System Reset (with watchdog timer+battery back-up)
Monolithic IC MM1106
Package
SOP-14B (MM1106XF)
DIP-14A (MM1106XD)
Applications
1. Fax machines
2. Photocopiers
3. Air conditioners
4. Control equipment
5. Sequencers, etc.
Item
Symbol
Ratings
Units
Power supply voltage
V
CC
max.
-0.3~+7
V
Voltage applied to input pin
V
IN
-0.3~V
CC
+0.3 ( <
= +7)
V
Voltage applied to output pin
V
OUT
-0.3~V
CC
+0.3 ( <
= +7)
V
V
OUT
output current 1
I
L
1
50
mA
V
OUT
output current 2
I
L
2
120
A
Allowable loss
Pd
300
mW
Storage temperature
T
STG
-40~+125
C
Absolute Maximum Ratings
(Ta=25C)
Note: I
L
1 expresses output current value from main power supply (V
CC
) and I
L
2 expresses
output current value from battery (V
BAT
).
MITSUMI
System Reset (with watchdog timer+battery back-up) MM1106
Recommended Operating Conditions
Item
Symbol
Ratings
Units
Power supply voltage
V
CC
+2.5~+6.5
V
RESET sink current
I
OLR
0~1.0
mA
CS sink current
I
OLC
0~500
A
V
OUT
output current 1
I
L
1
0~30
mA
V
OUT
output current 2
I
L
2
0~80
A
Clock input high level voltage
V
CKH
2.0<
V
Clock input low level voltage
V
CKL
<0.4
V
Clock monitoring time setting
T
WD
1~1000
ms
Clock rise and fall times
T
RCK
, T
FCK
<100
s
Power supply voltage rise times
T
RVCC
100<
s
Power supply voltage fall times
T
FVCC
50<
s
TC pin capacitance
C
T
0.0002~2
F
Operating temperature
T
OP
-25~+75
C
Item
Symbol Measurement
conditions
Min. Typ. Max. Units
Consumption current
I
CC
V
CC
=5.0V, I
O
=0A
270
400
A
RESET detection voltage
V
SLR
V
CC
: Hi Lo
4.00
4.20
4.40
V
Detection voltage
V
SR
0.01 0.05 %/
C
temperature coefficient R
T
Hysteresis voltage R
V
HYSR
V
CC
: Lo Hi
0.05
0.10
0.20
V
CK input threshold
V
TH
0.8
1.2
2
V
CK input current
I
IH
V
CK
=5.0V
0
1
A
I
IL
V
CK
=0V
-15
-7
-2
Output voltage R H
V
OHR
I
RESET
--------------------------------------------
=-5A
4.0
4.5
V
Output voltage R L
V
OLR
I
RESET
--------------------------------------------
=1.0mA
0.3
0.5
V
Output sync current R
I
OLR
V
CC
=3.5V, V
RESET
--------------------------------------------
=1V
1
2
mA
Output source current R
I
OHR
V
RESET
--------------------------------------------
=4.5V
8
15
A
C
T
charge current
I
CT
1
V
TC
=0.7V during watchdog timer operation -0.48 -0.24 -0.16
A
I
CT
2
V
TC
=0.7V during power ON reset operation -0.48 -0.24 -0.16
A
CS detection voltage
V
SLC
V
CC
: Hi Lo
4.20
4.40
4.60
V
Detection voltage
V
SC
0.01 0.05 %/C
temperature coefficient C
T
Hysteresis voltage C
V
HYSC
V
CC
: Hi Lo
0.05
0.10
0.20
V
Output voltage C H
V
OHC
V
CC
=5.0V, I
CS
=1A
4.50
4.65
V
Output voltage C L
V
OLC
V
CC
=3.5V, I
CS
=1A
0.1
0.4
V
Output sync current C
I
OLC
V
CC
=3.5V, V
CS
=0.3A
0.5
1.0
mA
Output source current C
I
OHC
V
CC
=5.0V, V
CS
=4.5V
50
75
A
Power supply switching voltage
V
BB
V
CC
: Hi Lo
3.15
3.30
3.45
V
Detection voltage
V
BB
0.01 0.05 %/
C
temperature coefficient B
T
Hysteresis voltage B
V
HYSB
V
CC
: Lo Hi
0.05
0.10
0.20
V
I/O voltage difference 1 (normal)
V
SAT
1
V
CC
=5.0V, I
O
=-30mA
0.3
0.5
V
I/O voltage difference 2 (backup)
V
SAT
2
I
O
=-80A, V
BAT
=3.0V
0.3
0.4
V
Electrical Characteristics
(Typical model MM1106X) (Except where noted otherwise, Ta=25C, V
CC
=5.0V, V
BAT
=3.0V)
(Except where noted otherwise, resistance unit is
)
MITSUMI
System Reset (with watchdog timer+battery back-up) MM1106
Item
Symbol Measurement
conditions
Min.
Typ.
Max.
Units
Loss current
I
LOSS
V
CC
=0V, I
O
=0A, V
BAT
=3V
0.1
A
Reverse current
I
OREV
V
CC
=5.0V, I
O
=0A, V
BAT
=0V
0.1
A
External PNP transistor
I
BASE
V
CC
=5.0V, V
OUT
=4.2V, V
TB
=4.3V
2
5
mA
base-driving current
V
CC
input pulse width
T
PI
V
CC
5.0V
8
s
4.0V
CK input pulse width
T
CKW
CK
t
CKW
or
3
s
CK input cycle
T
CK
CK
t
Ck
20
s
Watchdog timer
T
WD
C
T
=0.02F
50
100
150
ms
monitoring time
*
1
Watchdog timer
T
WR
C
T
=0.02F
1
2
3
ms
reset time
*
2
Reset hold time for
T
PR
V
CC
: Lo Hi (100s), C
T
=0.02F
50
100
150
ms
power supply rise
*
3
RESET
---------------------------------------------
delay time
T
PDR
V
CC
: Hi Lo (50s), C
LR
=15pF, R
LR
=22k
10
s
CS delay time
T
PDC
V
CC
: Hi Lo (50s), C
LC
=15pF
10
s
RESET
--------------------------------------------
rise time
T
RR
C
LR
=15pF, R
LR
=22k
4
s
RESET
--------------------------------------------
fall time
T
FR
C
LR
=15pF, R
LR
=22k
4
s
CS rise time
T
RC
C
LC
=15pF
4
s
CS fall time
T
FC
C
LC
=15pF
4
s
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
------------------------------------------------
output high).
*
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
=0.02F
T
PR
(ms)
.
=. 5000 C
T
(F)
T
PR
.
=. 100ms
T
WD
(ms)
.
=. 5000 C
T
(F)
T
WD
.
=. 100ms
T
WR
(ms)
.
=. 100 C
T
(F)
T
WR
.
=. 2ms
*
5 The voltage range when measuring output rise and fall time is 10~90%.
*
6 The IC can be made to operate only as a reset IC with delay during Vcc rise by connecting the RCT pin to
GND.
*
7 V
CC
rise time should be 100s or more, and fall time should be 50s or more.
MITSUMI
System Reset (with watchdog timer+battery back-up) MM1106
Pin Description
Pin No.
Pin name
Function
1
GND
Ground
2
N.C
NON CONNECT
3
CK
Clock input
4
RESET
--------------------------------------------
Reset output
5
N.C
NON CONNECT
6
TC
Capacitor for setting power ON delay and timer monitoring times
7
RCT
Watchdog timer stop (when connected to GND); timer time adjustment
8
CS
Chip select output
9
TB
External power transistor drive pin
10
V
BAT
Back-up power supply input
11
N.C
NON CONNECT
12
V
OUT
Back-up voltage output
13
N.C
NON CONNECT
14
V
CC
Main power supply
Block Diagram
Note : Connect external transistor when output current is more than 50mA.
MITSUMI
System Reset (with watchdog timer+battery back-up) MM1106
Timing Chart
V
HYSC
V
SLC
V
HYSR
V
SLR
V
HYSB
V
BB
V
CC
V
TH
CK
C
T
CS
V
OUT
V
BAT
RESET
4.7V
2.7V
3.0V
T
WR
T
WD
T
PR
T
PR
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