MITSMI MM1095BF, MM1095BS, MM1095AD, MM1095AF, MM1095AS Datasheet
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MITSUMI
1432
8567
SOP-8C/DIP-8B
System Reset (with built-in watchdog timer) MM1095
System Reset (with built-in watchdog timer)
Monolithic IC MM1095
Outline
This IC functions in a variety of CPU systems and other logic systems to generate a reset signal and reset the
system accurately during momentary interruption or lowering of power supply voltage.
It also has a built-in watchdog timer for operation diagnosis. This prevents the system from running wild by
generating an intermittent reset pulse during system mis-operation.
Features
1. Built-in watchdog timer
2. Low minimum operating voltage 100µA typ.
3. Low operating limit voltage Vcc=0.8V
4. Watchdog stop function (RCT pin)
5. Few external parts
Package
DIP-8B (MM1095AD, MM1095BD)
SOP-8C (MM1095AF, MM1095BF)
SIP-8A (MM1095AS, MM1095BS)
Applications
1. Reset circuits in microcomputers, CPUs and MPUs
2. Logic circuit reset circuits
3. Microcomputer system monitoring, etc.
Pin Assignment
1 TC
2 NC
3 CK
1 TC
2 NC
3 CK
4 GND
5 V
6 RCT
7 V
8 RESET
CC
S
------------------------------------------
13572468
SIP-8A
4 GND
5 V
6 RCT
7 V
8 RESET
CC
S
------------------------------------------
MITSUMI
System Reset (with built-in watchdog timer) MM1095
Pin Description
Pin No. Name Function
TWD, TWR, TPR variable pins
1 TC
(T
WD, TWR and TPR times are determined TWD (mS)=500 CT (µF)
by the external capacitor.) T
2 N.C
3 CK
4 GND
5 V
6 RCT
7 V
------------------------------------------------------------------------------------
8 RESET
Clock input pin, inputs clock from logic system
GND pin
CC
Voltage detection MM1095A 3.2V, MM1095B 4.2V
Watchdog timer stop pin Operation modes : Operation OPEN, Stop connect to GND
S
Detection voltage variable pin
Reset output pin (low output)
Absolute Maximum Ratings
Item Symbol Rating Units
Power supply voltage V
CK pin input voltage V
S pin input voltage VVS
V
Voltage applied to RCT pin V
Voltage applied to RESET
Allowable loss Pd 400 mW
Storage temperature T
--------------------------------------------
.
CC max.
CK
RCT
pin VOH
STG
TPR (mS)=5000 CT (µF)
WR (mS)=100 CT (µF)
-
0.3~+10 V
-
0.3~VCC+0.3 (
-
0.3~VCC+0.3 (
-
0.3~VCC+0.3 (
-
0.3~VCC+0.3 (
-
40~+125 °C
<
+10) V
=
<
+10) V
=
<
+10) V
=
<
+10) V
=
Recommended Operating Conditions
Item Symbol Rating Units
Power supply voltage V
-------------------------------------------
RESET
sync current IOL 0~1.0 mA
Clock monitoring time setting T
Clock rise and fall times t
TC pin capacitance C
Operating temperature T
CC +2.2~+7.0 V
WD 0.1~1000 mS
FC, tRC <100 µS
T 0.0002~2 µF
OP
-
25~+75
°
C
MITSUMI
System Reset (with built-in watchdog timer) MM1095
Electrical Characteristics (DC)
(Except where noted otherwise, MM1095A : Vcc=3.6V, Ta = 25°C, MM1095B: Vcc=5.0V)
Item Symbol Measurement conditions Min. Typ. Max. Units
Consumption
current
MM1095A
CC During watchdog timer operation
I
MM1095B 130 195
MM1095A
SL
V
VS=OPEN, VCC
3.10 3.20 3.30
100 150
Detection MM1095B 4.05 4.20 4.35
voltage MM1095A
SH
V
VS=OPEN, VCC
3.15 3.25 3.35
MM1095B 4.15 4.30 4.45
Detection voltage
V
S/ T ±0.01 %/
temperature coefficient
Hysteresis voltage
MM1095A
HYS
V
VSH-VSL, VCC
25 50 100
MM1095B 50 100 150
CK input threshold V
TH 0.8 1.2 2 V
I
IH A : VCK=3.6V, B : VCK=5.0V 0 1
CK input current
IL VCK=0V
I
Output voltage
MM1095A
OH
V
(High) MM1095B V
V
OL1 I =0.5mA, VS=0V 0.2 0.4
Output voltage (Low)
OL2 I =1.0mA, VS=0V 0.3 0.5
V
R output sync current I
T charge current
C
OL V =1.0V, VS=0V 1 2 mA
I
I
CT1
CT2
VTC=1.0V during watchdog timer operation-1.60-2.40-4.80 µA
VTC=1.0V during power ON reset operation-0.16-0.24-0.48 µA
Minimum operating power
supply voltage to ensure RESET
--------------------------------------------------------------------------
VCCL 0.8 1.0 V
------------------------------------------
RESET
I=-1µA 3.0 3.4
S=OPEN 4.0 4.5
------------------------------------------
RESET
------------------------------------------
RESET
------------------------------------------
RESET
------------------------------------------
RESET
V =0.4V
------------------------------------------
RESET
I =0.1mA
-
12
µA
V
°
C
mV
µA
-
6
-
2
V
V
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