MM1075XD [MITSUMI]
System Reset (with built-in watchdog timer) Monolithic IC; 系统复位（带内置看门狗定时器）单片IC
| 型号： | MM1075XD |
| 厂家： | 
MITSUMI ELECTRONICS, CORP. |
| 描述： | System Reset (with built-in watchdog timer) Monolithic IC |
| 文件： | 总10页 (文件大小：240K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
System Reset (with built-in watchdog timer) MM1075
MITSUMI
System Reset (with built-in watchdog timer)
Monolithic IC MM1075
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
VCC=0.8V typ.
3. Both positive and negative logic reset output can be extracted
4. Accurate detection of drop in power supply voltage
5. Detection voltage has hysteresis
6. Few external parts
1 capacitor
7. Timer monitoring time can be varied by using an external resistor
Package
DIP-8A (MM1075XD)
SOP-8A (MM1075XF)
Applications
Microcomputer system monitoring, etc.
°
(Ta=25 C)
Absolute Maximum Ratings
Item
Symbol
TSTG
Rating
Units
°
C
Storage temperature
-
40~+125
°
Operating temperature
Power supply voltage
Voltage applied to VS & CK pins
Voltage applied to RESET, -R-------------E------------S-------------E------------T----------- pin
Allowable loss
TOPR
-
-
-
-
20~+70
0.3~+10
0.3~+10
0.3~+10
400
C
VCC max.
VVS &VCK
VOH
V
V
V
Pd
mW
System Reset (with built-in watchdog timer) MM1075
(Except where noted otherwise, Ta=25°C, VCC=5V)
MITSUMI
Electrical Characteristics (DC)
Measurement
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
circuit
Consumption current
Detection voltage
ICC
VSL
VSH
1
1
1
During watchdog timer operation
VS=OPEN, VCC
0.7
1.0
mA
V
4.05 4.20 4.35
4.15 4.30 4.45
VS=OPEN, VCC
Detection voltage
temperature coefficient
Hysteresis voltage
CK input threshold
°
VS/
T
1
0.01
%/ C
VHYS
1
1
1
1
1
1
1
1
1
1
1
1
50
100 150
mV
V
VSH
-
VSL, VCC
VTH
IIH
0.8
1.2
0
2
1
VCK=5V
VCK=0V
CK input current
µA
V
IIL
-20
-10
-3
----------------------------------------------------------------
RESET
VOH1
VOH2
VOL1
VOL2
VOL3
VOL4
IOL1
I
=
-5µA, VS=OPEN
4.5
4.5
4.8
4.8
0.2
0.3
0.2
0.3
16
Output voltage (High)
----------------------------------------------------------------
RESET
I
=-5µA, VS=0V
----------------------------------------------------------------
RESET
I
=3mA, VS=0V
=10mA, VS=0V
0.4
0.5
0.4
0.5
----------------------------------------------------------------
RESET
I
Output voltage (Low)
Output sink current
V
IRESET=0.5mA, VS=OPEN
IRESET=1mA, VS=OPEN
----------------------------------------------------------------
RESET
V
=1.0V, VS=0V
10
1
mA
µA
µA
V
IOL2
VRESET=1.0V, VS=OPEN
2
VTC=1.0V, RCT=OPEN during
watchdog timer operation
VTV=1.0V during power ON
reset operation
ICT1
ICT2
1
1
1
1
-0.8
-1.2
-
2.4
CT charge current 1
*
-0.8
-1.2
-
2.4
----------------------------------------------------------------
Minimum operating power supply
RESET
V
=0.4V
VCCL1
VCCL2
0.8
0.8
1.0
1.0
----------------------------------------------------------------------------
----------------------------------------------------------------
voltage to ensure RESET
RESET
I
=0.2mA
Minimum operating power supply
VRESET=VCC
-
0.1V
V
voltage to ensure RESET
RL2 (between Pin 2 and GND)
System Reset (with built-in watchdog timer) MM1075
MITSUMI
CC
(Except where noted otherwise, Ta=25°C, V =5V)
Electrical Characteristics (AC)
Measurement
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
circuit
5V
4V
or
VCC input pulse width
TP1
2
8
µS
VCC
CK input pulse width
CK input cycle
TCKW
TCK
2
2
3
20
µS
µS
CK
Watchdog timer
CT=0.1µF
RCT=OPEN
TWD
TWR
TPR
TPD1
TPD2
tR1
2
2
2
2
2
2
2
2
2
50
1
100 150
mS
mS
monitoring time 2
*
Reset time for
2
3
CT=0.1µF
watchdog timer 3
*
Reset hold time for
50
100 150
mS
µS
CT=0.1µF, VCC
RESET pin
power supply rise 4
*
Output delay time
from VCC
2
10
10
RL1=2.2kΩ, CL1=100pF
RESET pin
R1, 2=10kΩ, CL2=20pF
RESET pin
RL1=2.2kΩ, CL1=100pF
RESET pin
RL2=10kΩ, CL2=20pF
RESET pin
5
3
*
1.0
1.0
0.1
0.5
1.5
1.5
0.5
1.0
µS
µS
µS
µS
Output rise time
6
*
tR2
tF1
Output fall time
RL1=2.2kΩ, CL1=100pF
RESET pin
RL2=10kΩ, CL2=20pF
6
*
tF2
Notes:
1 ICT1 changes according to RCT 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 RCT pin to VCC with a resistor (RCT). 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 VCC exceeds detection voltage (VSH) during power ON reset until
--------------------------------------------------------------
reset release (RESET output high, RESET output low).
5 Output delay time is the time from when power supply voltage drops below detection voltage (VSI) until
*
reset (-R-------------E------------S-------------E------------T----------- output low, RESET output high).
6 Voltage range when measuring output rise and fall is 10~90%.
*
*
7 Watchdog timer monitoring time (TWD), watchdog timer reset time (TWR) and reset hold time (TPR) during
power supply rise can be changed by varying CT capacitance. The times are expressed by the following
formulae. The recommended range for CT is 0.001~10µF.
~
~
~
TPR (mS)
TWD (mS)
TWR (mS)
1000 CT (µF)
1000 CT (µF)
20 CT (µF)
Example : When CT=0.1µF (RCT pin OPEN)
~
~
~
TPR
TWD
TWR
100mS
100mS
2mS
System Reset (with built-in watchdog timer) MM1075
MITSUMI
(mS)
100
80
60
TWD
40
20
0
50k 100k
1M
10M
100M
∞
(Ω)
RCT
Graph 1 RCT & Monitoring Time
Note :The above graph shows data for when CT=0.1µF.
TWD is proportionate to CT. Refer to the calculation formula for TWD above.
Block Diagram
Note 1 : CP=0.1µF approx.
~
Note 2 : C 1000pF
Note 3 : The watchdog timer can be stopped by connecting the RCT pin to
GND. (Then it functions as a voltage detection circuit.)
Note 4 : TPR and TWD can be varied by pulling up the RCT pin to VCC with a
resistor. The recommended range for RCT is 100kΩ~RCT pin OPEN.
System Reset (with built-in watchdog timer) MM1075
MITSUMI
Timing Chart
VCC
VSH
VSL
CK
CT
TCK
TWD
TPR
RESET
RESET
TWR
Pin Assignment
1
2
3
4
5
6
7
8
TC
RESET
CK
8
1
7
6
3
5
4
GND
VCC
2
RCT
VS
-----------------------------------------------------------------------------
RESET
Pin Description
Pin No. Pin Name
Function
1
2
3
4
5
6
7
8
TC
TWD, TWR, TPR variable pins.(TWD, TWR and TPR times are determined by the external capacitor.)
RESET Reset output pin (High output)
CK
GND
VCC
Clock input pin (inputs clock from logic system)
4.2V detection voltage
RCT
Watchdog timer stop pin Operation modes : Operation OPEN, Stop connect to GND
Detection voltage variable pin Adjustment modes : Lower pull up resistance, Raise pull down
VS
---------------------------------------------------------------
RESET Reset output pin (Low output)
System Reset (with built-in watchdog timer) MM1075
Measuring Circuit 2
MITSUMI
Measuring Circuits
Measuring Circuit 1
SW & Power Supply Table
Measuring Circuit 2-1
-------------------------------------------------------------
RESET
Item
Symbol SW1 SW2 SW3 SW4 SW5 SW6 SW7
V
CC
V
CK
VCT
I
IRESET VM, IM Notes
Consumption current
I
CC
OFF OFF OFF ON
OFF OFF ON ON
OFF OFF ON ON
OFF OFF OFF ON
OFF OFF OFF ON
OFF OFF OFF ON
ON OFF ON ON
OFF ON ON ON
ON ON ON ON
ON ON ON ON
OFF OFF ON ON
OFF OFF ON ON
OFF ON ON ON
OFF OFF ON ON
OFF OFF OFF ON
OFF OFF ON ON
B
B
B
B
B
B
B
C
B
B
C
C
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
C
A
B
B
ON 5V
5V
0V
3V
3V
1V
0V
0V
3V
3V
3V
3V
3V
3V
3V
3V
1V
1V
-
-
-
-
-
-
-
-
-
-
-
-
-
I
CC
V
SL
ON 5V 4V 3V
ON 4V 5V 3V
ON 5V 0V 3V
V
V
O
1, CRT1
1, CRT1
Detection voltage
CK input threshold
CK input current
V
SH
O
V
TH
I
I
I
CK
CK
CK
I
IH
IL
ON 5V
ON 5V
ON 5V
ON 5V
ON 5V
ON 5V
ON 5V
ON 5V
ON 5V
ON 5V
OFF 5V
OFF 5V
5V
0V
5V
5V
5V
5V
5V
5V
5V
5V
-
I
Output voltage
(High)
VOH
1
2
1
2
3
4
-
5µA
V
V
V
V
V
V
O
O
O
O
O
O
1
2
1
1
2
2
VOH
- -5µA
V
V
V
V
OL
OL
OL
OL
3mA
-
-
Output voltage
(Low)
10mA
-
-
-
-
-
-
0.5mA
1mA
IOL
IOL
ITC
ITC
1
-
-
-
-
I
I
O
1
V
V
OO=1V
OO=1V
Output sink current
2
1
2
O
2
C
C
T
T
charge current 1
charge current 2
I
TC
-
I
TC
Minimum operating power supply
V
V
CCL
1
2
ON OFF ON ON
OFF ON ON ON
B
A
B
B
ON 0V 2V 0V
0V
0V
-
-
V
O
1, VCC
----------------------------------------------------------
voltage to ensure RESET
Minimum operating power supply
voltage to ensure RESET
CCL
ON 0V 2V 0V
-
VO
2, VCC
System Reset (with built-in watchdog timer) MM1075
MITSUMI
SW & Power Supply Table
Measuring Circuit 2-2
Item
Symbol SW1 SW2
V
CCA
VCC
V
CKA
VCK
CRT
Notes
T2
T3
5V
4V
1.4V
0V
T1
VCC input pulse width
T
PI
C
A
A
A
A
B
B
B
A
A
A
A
A
-
-
CRT1, 2, 3
T1=8µS
T2
1.4V
0V
CK input pulse width
CK input cycle
TCKW
-
-
-
-
-
5V
5V
5V
5V
5V
-
-
-
CRT1, 2, 3
T2=3µS
or
T2
T2
T3
1.4V
0V
TCK
CRT1, 2, 3 T3=20µS
Watchdog timer
monitoring time
Reset time for
T
WD
-
-
-
-
-
5V CRT1, 2, 3
5V CRT1, 2, 3
5V CRT1, 2, 3
0V CRT1, 3
0V CRT2, 3
TWR
watchdog timer
Reset hold time for
power supply rise
TPR
B A
5V
0V
5V
0V
T
PD
1
C
C
Output delay time
from VCC
T
PD
2
-
T
R
R
P
P
1
A
A
A
A
A
A
A
A
-
-
-
-
5V
5V
5V
5V
-
-
-
-
5V
5V
5V
5V
CRT1
CRT2
CRT1
CRT2
Output rise time
Output fall time
T
2
T
T
1
2
(lowering detection voltage)
Detection Voltage Adjustment 1
Graph 1. Detection voltage change using MM1075
external resistor
5.0
VSH value
4.5
VSL value
100 200 300 400 500 600
Vs pin external resistance
(R2) (kΩ)
Detection voltage can be changed by
connecting resistor R2 externally to
MM1075 VS pin. Determine R2 according to
graph 1 when changing VS.
System Reset (with built-in watchdog timer) MM1075
MITSUMI
(raising detection voltage)
Detection Voltage Adjustment 2
Graph 2. Detection voltage change using MM1075
external resistor
VSH value
4.0
VSL value
3.5
3.0
100 200 300 400 500 600
Vs pin external resistance
(R1) (kΩ)
Detection voltage can be changed by
connecting resistor R1 externally to
MM1075 VS pin. Determine R1 according
to graph 2 when changing VS.
Characteristics
Power supply current-Power supply
voltage
Output voltage-Power supply voltage
(RESET pin)
PULL UP resistance 10kΩ
1.4
1.2
1.0
0.8
0.6
7.0
6.0
5.0
Ta=20°C, 25°C, 75°C
4.0
3.0
2.0
1.0
Clock pulse input time
0.4
0.2
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
Power supply voltage
VCC (V)
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Power supply voltage
VCC (V)
Output voltage-Power supply
voltage (RESET pin)
Detection voltage (VSL, VSH) temperature
(RESET, -R--------------E-------------S-------------E-------------T----------- pins)
PULL UP resistance 2.2kΩ
7.0
4.50
4.40
4.30
4.20
4.10
4.00
3.90
6.0
5.0
4.0
3.0
VSH
VSL
Ta=-
25°C
2.0
1.0
Ta=25°C
Ta=75°C
-40-20 0 20 40 60 80 100
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Power supply voltage
VCC (V)
Ambient temperature Ta (°C)
System Reset (with built-in watchdog timer) MM1075
MITSUMI
Output saturation voltage-Output sink current
(RESET pin)
Output saturation voltage-Output sink current
(-R--------------E-------------S-------------E-------------T----------- pin)
------------------------------------------------------------------------
500
500
400
300
°
400
300
200
100
Ta=75 C
Ta=75°C
°
Ta=25 C
Ta=25°C
200
100
°
Ta=-25 C
Ta=-
25°C
2
4
6
8 10 12 14 16 18
0.2 0.4 0.6 0.8 1.0 1.4 1.6 1.8
Output sink current
IOL (mA)
Output sink current IOL (mA)
High level output voltage-High level output
current (RESET pin)
High level output voltage-High level output
current (RESET pin)
-----------------------------------------------------------
5.0
4.8
4.6
5.0
4.8
4.6
4.4
4.2
4.0
3.8
4.4
4.2
4.0
3.8
-2-4 -6-8-10-12-14-16-18
-2 -4 -6 -8-10-12-14-16-18
High level output current
High level output current
IOM (µA)
IOM (µA)
Reset hold time temperature during power
supply rise
Watchdog timer monitoring time
temperature
VCC=5V (Cr=0.1µF)
VCC=5V (Cr=0.1µF)
160
160
140
120
100
80
140
120
100
80
60
60
40
40
-40-20 0 20 40 60 80 100
-40 -20 0 20 40 60 80 100
Ambient temperature Ta (°C)
Ambient temperature Ta (°C )
System Reset (with built-in watchdog timer) MM1075
MITSUMI
Reset time temperature
(for watchdog timer)
Watchdog timer monitoring time
temperature
VCC=5V (Cr=0.1µF)
VCC=5V (Cr=0.1µF)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
100
6PIN 5MΩ PULL UP
10
6PIN 100kΩ PULL UP
-40 -20
0
20 40 60 80 100
-20
-40
0
20 40 60 80 100
Ambient temperature Ta (°C)
Ambient temperature Ta (°C)
CT
value for reset hold time during power
CT
value for reset time (for watchdog timer)
supply rise
105
104
103
102
103
102
101
100
101
100
-
1
2
10
10
-
-
3
-
2
-1
10 10 10 100 101
-
3
-
2
-1
10 10 10 100 101
CT capacitance (µF)
CT capacitance (µF)
CT
value for watchdog timer monitoring
Type of timer time adjustment
time
CT
value for watchdog timer monitoring time
Connect R between
Rct and VCC
104
105
104
103
R=
OPEN
2.2MΩ
1kΩ
470kΩ
200kΩ
102
103
102
101
100
101
100
-
1
10
-
3
-
2
-1
10 10 10 100 101
-
3
-
2
-1
10 10 10 100 101
CT capacitance (µF)
CT capacitance (µF)
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