Page 1
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 270µA typ.
2. Watchdog timer
Detection voltage 4.2V typ.
C
T charging current
-
0.24µA 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) 0.1µA 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~VCC+0.3 (
<
=
+7)
V
Voltage applied to output pin V
OUT
-
0.3~VCC+0.3 (
<
=
+7)
V
V
OUT output current 1 IL150mA
V
OUT output current 2 IL2 120 µA
Allowable loss Pd 300 mW
Storage temperature T
STG
-
40~+125
°
C
Absolute Maximum Ratings
(Ta=25°C)
Note: IL1 expresses output current value from main power supply (VCC) and IL2 expresses
output current value from battery (V
BAT).
Page 2
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 µA
V
OUT output current 1 IL1 0~30 mA
V
OUT output current 2 IL2 0~80 µA
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
TRCK, TFCK <100 µS
Power supply voltage rise times T
RVCC 100< µS
Power supply voltage fall times T
FVCC 50< µS
TC pin capacitance C
T 0.0002~2 µF
Operating temperature T
OP
-
25~+75
°
C
Item Symbol Measurement conditions Min. Typ. Max. Units
Consumption current I
CC VCC=5.0V, IO=0µA 270 400 µA
RESET detection voltage
V
SLR VCC : 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 VCC : 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 VCK=5.0V 0 1
µA
I
IL VCK=0V
-
15
-
7
-
2
Output voltage R H V
OHR IRESET
--------------------------------------------
=-5µA 4.0 4.5 V
Output voltage R L V
OLR IRESET
--------------------------------------------
=1.0mA 0.3 0.5 V
Output sync current R I
OLR VCC=3.5V, VRESET
--------------------------------------------
=1V 1 2 mA
Output source current R I
OHR VRESET
--------------------------------------------
=4.5V 8 15 µA
C
T charge current
I
CT1VTC=0.7V during watchdog timer operation
-
0.48-0.24-0.16 µA
I
CT2VTC=0.7V during power ON reset operation
-
0.48-0.24-0.16 µA
CS detection voltage V
SLC VCC : 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 VCC : Hi Lo 0.05 0.10 0.20 V
Output voltage C H V
OHC VCC=5.0V, ICS=1µA 4.50 4.65 V
Output voltage C L V
OLC VCC=3.5V, ICS=1µA 0.1 0.4 V
Output sync current C I
OLC VCC=3.5V, VCS=0.3µA 0.5 1.0 mA
Output source current C I
OHC VCC=5.0V, VCS=4.5V 50 75 µA
Power supply switching voltage
VBB VCC : 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 VCC : Lo Hi 0.05 0.10 0.20 V
I/O voltage difference 1 (normal)
VSAT1VCC=5.0V, IO=-30mA 0.3 0.5 V
I/O voltage difference 2 (backup)
VSAT2IO=-80µA, VBAT=3.0V 0.3 0.4 V
Electrical Characteristics
(Except where noted otherwise, Ta=25°C, VCC=5.0V, VBAT=3.0V)
Page 3
MITSUMI
System Reset (with watchdog timer+battery back-up) MM1106
Item Symbol Measurement conditions Min. Typ. Max. Units
Loss current I
LOSS VCC=0V, IO=0µA, VBAT=3V 0.1 µA
Reverse current I
OREV VCC=5.0V, IO=0µA, VBAT=0V 0.1 µA
External PNP transistor
I
BASE VCC=5.0V, VOUT=4.2V, VTB=4.3V 2 5 mA
base-driving current
V
CC input pulse width TPI VCC
5.0V
8µS
4.0V
CK input pulse width T
CKW CK
t
CKW
or 20 µS
CK input cycle T
CK CK
t
Ck
20 µS
Watchdog timer
T
WD CT=0.02µF 50 100 150 mS
monitoring time
*
1
Watchdog timer
T
WR CT=0.02µF 1 2 3 mS
reset time
*
2
Reset hold time for
T
PR VCC : Lo Hi (100µS), CT=0.02µF 50 100 150 mS
power supply rise
*
3
RESET
---------------------------------------------
delay time TPDR
VCC: Hi Lo (50µS), CLR=15pF, R
LR
=22kΩ
10 µS
CS delay time T
PDC VCC : Hi Lo (50µS), CLC=15pF 10 µS
RESET
--------------------------------------------
rise time TRR CLR=15pF, RLR=22kΩ 4µS
RESET
--------------------------------------------
fall time TFR CLR=15pF, RLR=22kΩ 4µS
CS rise time T
RC CLC=15pF 4 µS
CS fall time T
FC CLC=15pF 4 µS
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 (VSHR) during power ON reset until
reset release (RESET
------------------------------------------------
output high).
*
4 Watchdog timer monitoring time (TWD), watchdog timer reset time (TWR) and reset hold time (TPR) during
power supply rise can be changed by varying C
T capacitance. The times are expressed by the following
formulae.
Example : when C
T=0.02µF
T
PR (mS)
.
=.5000 CT (µF) TPR
.
=.100mS
T
WD (mS)
.
=.5000 CT (µF) TWD.=.100mS
T
WR (mS)
.
=.100 CT (µF) TWR.=.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.
*
7VCC rise time should be 100µS or more, and fall time should be 50µS or more.
Page 4
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.
Page 5
MITSUMI
System Reset (with watchdog timer+battery back-up) MM1106
Timing Chart
VHYSC
VSLC
VHYSR
VSLR
VHYSB
VBB
VCC
VTH
CK
C
T
CS
V
OUT
VBAT
RESET
4.7V
2.7V
3.0V
T
WR
TWD
TPR
TPR
Loading...