NJM2102
SYSTEM RESET IC
■
GENERAL DESCRIPTION
The
NJM2102
Possesses two functions. One is to detect a voltage
which decays from the desired voltage and generate a warning signal.
And also, the
NJM2102
holds the warning signal for a certain term
after the specified voltage is obtained or recovered. The other one
(Watch Dog Timer) is to identify missing clocks of microprocessors.
Therefore, it should be said that the
NJM2102
is ideal to protect any
microprocessors from the fales operations induced by undesired
condition.
■
PACKAGE OUTLINE
NJM2102D
(DIP8)
NJM2102M
(DMP8)
■
FEATURES
●
Internal Watch Dog Timer
●
Precise Detection of Supply Voltage Down
●
Package Outline
●
Bipolar Technology
(4.2V ±2.5%)
DIP8, DMP8, SIP8
NJM2102L
(SIP8)
■
PIN CONFIGURATION
PIN FUNCTION
1. C
T
2. RESET
3. CK
4. GND
5. V
+
6. V
REF
7. V
S
8.
RESET
NJM2102D
NJM2102M
NJM2102L
■
BLOCK DIAGRAM
Ver.2013-03-06
-1-
NJM2102
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage
Input Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
+
V
V
S
V
CK
P
D
T
opr
T
stg
RATINGS
20.0
+
V +0.3 (<20.0)
20.0
(DIP8)
500
(DMP8)
300
(SIP8)
800
-40 to +85
-40 to +125
(T
a
=25°C)
UNIT
V
V
V
mW
°C
°C
■
ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Current
Detection Voltage 1
Detection Voltage 2
Hysteresis Width
Reference Voltage
Supply Voltage Regulation
Reference Voltage Load Regulation
CK Input Threshold Voltage
CK Input Current 1
CK Input Current 2
C
T
Charge Current 1
C
T
Charge Current 2
C
T
Discharge Current 1
C
T
Discharge Current 2
High Level Output Voltage 1
High Level Output Voltage 2
Output Saturation Voltage 1
Output Saturation Voltage 2
Output Saturation Voltage 3
Output Saturation Voltage 4
Output Sink Current 1
Output Sink Current 2
RESET Minimum Supply Voltage 1
RESET Minimum Supply Voltage 2
SYMBOL
I
CC
V
SL
V
SH
V
HYS
V
REF
∆V
REF1
∆V
REF2
V
TH
I
IH
I
IL
I
CTC1
I
CTC2
I
CTD1
I
CTD2
V
OH1
V
OH2
V
OL1
V
OL2
V
OL3
V
OL4
I
OL1
I
OL2
V
CCL1
V
CCL2
CONDITION
Watch Dog Timer Operating
Falling Down Supply Voltage
Rising Up Supply Voltage
V
HYS
= V
SL
- V
SH
V
+
= 3.5V to 18V
I
OUT
= -200µA to +5µA
V
CK
= 5.0V
V
CK
= 0.0V
V
CT
= 1.0V Watch Dog Timer Operating
V
CT
= 0.0V Power ON Reset Operating
V
CT
= 1.0V Watch Dog Timer Operating
V
CT
= 0.0V Power ON Reset Operating
V
S
=Open.
I
RESET
= -5µA
V
S
=0V, I
RESET
= -5mA
V
S
=0V,
I
RESET
=3mA
V
S
=0V,
I
RESET
=10mA
V
S
=Open. I
RESET
=3mA
V
S
=Open. I
RESET
=10mA
V
S
=0V,
V
RESET
=1.0V
V
S
=Open.
V
RESET
=1.0V
V
RESET
=0.4V,
I
RESET
=0.2mA
(V
+
=5V, T
a
=25°C)
MIN.
-
4.10
4.20
50
1.217
-10
-5
0.70
-
-1.0
20
0.6
6
100
4.5
4.5
-
-
-
-
20
20
-
-
TYP.
0.65
4.20
4.30
100
1.235
+3
-
1.24
0
-0.1
50
1.4
9
600
4.9
4.9
0.2
0.3
0.2
0.3
70
70
0.8
0.8
MAX.
1.00
4.30
4.40
150
1.253
+10
+5
1.90
1.0
-
110
3.0
13
-
-
-
0.4
0.5
0.4
0.5
-
-
1.2
1.2
UNIT
mA
V
V
mV
V
mV
mV
V
µA
µA
µA
µA
µA
µA
V
V
V
V
V
V
mA
mA
V
V
V
RESET
=V -0.1V, R
L
(2Pin-GND)=1MΩ
+
AC CHARACTERISTICS
PARAMETER
V Input Pulse Width
+
(V
+
=5V, T
a
=25°C)
SYMBOL
T
PI
T
CKW
T
CK
T
WD
T
WR
T
PR
T
PD1
T
PD2
t
R
t
F
CONDITION
V
CC
5V
4V
CK
C
T
=0.1µF
C
T
=0.1µF
C
T
=0.1µF, V
+
MIN.
-
-
-
-
-
-
-
-
-
-
TYP.
10
1.8
12
10
2
100
2
3
1.0
0.1
MAX.
-
-
-
-
-
-
-
-
-
-
UNIT
µS
µS
µS
mS
mS
mS
µS
µS
µS
µS
CK Input Pulse Width
CK Input Frequency
Watch Dog Timer Watching Time
Watch Dog Timer Reset Time
Reset Signal Hold Time
Propagation Delay from V
+
Propagation Delay from V
Output Rise Time
Output Fall Time
+
or
RESET Pin, R
L
=2.2kΩ, C
L
=100pF
RESET Pin R
L
=2.2kΩ, C
L
=100pF
R
L
=2.2kΩ, C
L
=100pF
R
L
=2.2kΩ, C
L
=100pF
-2-
Ver.2013-03-06
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