NJU7295
SYSTEM RESET IC WITH DELAY CIRCUIT
■
GENERAL DESCRIPTION
The NJU7295 is a system reset IC with built-in delay circuit that
monitors the status of a power line, and outputs a reset signal to
the microcomputer.
The NJU7295 outputs a reset signal when exceeds the detection
voltage. Therefore it is possible to control the microcomputer by
detecting a rising edge of a power line.
Delay times are fixed internally and those are set in each of rising
and falling.
It is possible to monitor multiplex power line by combination of
NJU7295 because output voltage V
OUT
is kept High level when
EXT Pin is Low level by connecting with other NJU7295.
Detection voltage’s default value is 1.0V. It can be adjusted to
desired voltage by the resistor divider.
In addition, a hysteresis voltage can be set arbitrarily by inserting a
resistor between the V
IN
pin and the HYS pin.
■
FEATURES
●
High Precision Detection Voltage
●
Detection Voltage
●
Reset Output Logic
■
PACKAGE OUTLINE
NJU7295F1
●
Delay Circuit (Internal Fixed type)
●
Ultra Low Quiescent Current
●
Supply Voltage Range
●
External Input Pin
●
Adjustable Hysteresis Voltage
●
Output Type
●
Package
■
PIN CONFIGURATION
1.0% (Ta=25 C)
1.0V (default) and adjustable with external resistor
Reset Low output when V
IN
pin is detection voltage or more
*If required reset low output when V
IN
pin is detection voltage or below, see the
NJU7296.
Rising / Falling independent setting
1.7µA typ.
1.5 to 5.5V
While inputting low signal, keep output High level
CMOS output
SOT-23-6-1
V
IN
1
V
SS
2
EXT 3
6 HYS
5 V
OUT
4 V
DD
Pin Function
1. V
IN
：Input
Voltage Pin
2. V
SS
：Ground
Pin
3. EXT
：External
Input Pin
4. V
DD
：Supply
Voltage Pin
5. V
OUT
：Output
Pin
6. HYS
：External
Resistor Pin for setting Hysteresis Voltage
Ver.2015-11-11
-1-
NJU7295
■
BLOCK DIAGRAM
V
DD
HYS
V
IN
Delay
Circuit
V
OUT
V
SS
EXT
■
PRODUCT CLASSFICATION
Version Delay Time1(Typ.) Delay Time2(Typ.)
Device Name
NJU7295F1-A
A
10ms
1.25ms
NJU7295F1-A-T
NJU7295F1-B
B
20ms
10ms
NJU7295F1-B-T
NJU7295F1-C
C
10ms
10ms
NJU7295F1-C-T
NJU7295F1-D
D
10ms
30µs
NJU7295F1-D-T
-40
-40
-40
-40
Spec Guarantee
(General Spec.)
25 C
C to +105 C (T Spec.)
(General Spec.)
25 C
C to +105 C (T Spec.)
(General Spec.)
25 C
C to +105 C (T Spec.)
(General Spec.)
25 C
C to +105 C (T Spec.)
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
V
DD
Input Voltage
V
IN
Output Voltage
V
OUT
HYS Pin Voltage
V
HYS
EXT Pin Input Voltage
V
EXT
Output Current
I
OUT
HYS Pin Current
I
HYS
Power Dissipation
Surge Current
Operating Temperature
Storage Temperature
P
D
I
IN_SRG
T
opr
T
stg
RATINGS
+7
V
SS
-0.3 to +7
V
SS
-0.3 to V
DD
+0.3
V
SS
-0.3 to V
DD
+0.3
V
SS
-0.3 to V
DD
+0.3
50
10
410(*1)
SOT-23-6-1
580(*2)
±2.5(*3)
-40 to +105
-40 to +125
(Ta=25 C)
UNIT
V
V
V
V
V
mA
mA
mW
mA
C
C
(*1): Mounted on glass epoxy board. (76.2 114.3 1.6mm: based on EIA/JDEC standard, 2Layers)
(*2): Mounted on glass epoxy board. (76.2 114.3 1.6mm:based on EIA/JDEC standard, 4Layers), internal Cu area: 74.2 74.2mm
(*3):
Permissible current
range there is no logical error in V
OUT
and no destruction
-2-
Ver.2015-11-11
NJU7295
■
ELECTRICAL CHARACTERISTICS
PARAMETER
Detection Voltage
Quiescent Current
SYMBOL
V
DET
I
SS
Unless otherwise noted, V
DD
=3.3V, Ta=25 C
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
-1.0%
1.0
+1.0%
V
-2.5%
+2.5%
‐
Ta=-40 C to 105 C
No Signal
-
1.7
3.0
µA
-
-
3.5
No Signal ,Ta=-40 C to 105 C
Nch, V
DS
=0.5V
12
15
-
10
-
-
Nch, V
DS
=0.5V, Ta=-40 C to 105 C
mA
Pch, V
DS
=0.5V
7.5
11
-
6.0
-
-
Pch, V
DS
=0.5V, Ta=-40 C to 105 C
Nch, V
DS
=0.5V
7.5
12
-
6.0
-
-
Nch, V
DS
=0.5V, Ta=-40 C to 105 C
mA
Pch, V
DS
=0.5V
5.0
9.0
-
4.0
-
-
Pch, V
DS
=0.5V, Ta=-40 C to105 C
Ta=0 C to +85 C
-
0.67 V
DD
0.7 V
DD
-
-
10
8
0.5
0.4
1.5
1.5
100
-
-
-
-
20
-
1.0
-
-
-
-
V
DD
V
DD
0.33 V
DD
0.3 V
DD
-
-
-
-
5.5
5.5
ppm/ C
V
V
MΩ
MΩ
V
Output Current
I
OUT
HYS Pin Current
Average Temperature
Coefficient of Detection
Voltage
EXT Pin
High Level Voltage
EXT Pin
Low Level Voltage
V
IN
Pin Resistance
EXT Pin Resistance
Operating Voltage
I
HYS
V
DET
/ Ta
V
EXT_H
V
EXT_L
R
IN
R
EXT
V
OPL
Ta=-40 C to 105 C
Ta=-40 C to 105 C
Ta=-40 C to 105 C
Ta=-40 C to 105 C
Ta=-40 C to 105 C
■
ELECTRICAL CHARACTERISTICS (Defined by each versions)
PARAMETER
SYMBOL
Unless otherwise noted, V
DD
=3.3V, Ta=25 C
TEST CONDITION
MIN.
TYP.
MAX. UNIT
NJU7295F1-A
7
10
14
ms
6
-
14
NJU7295F1-A-T, Ta=-40 C to 105 C
NJU7295F1-B
16
20
24
ms
15
-
25
NJU7295F1-B-T, Ta=-40 C to 105 C
NJU7295F1-C
7
10
14
ms
6
-
14
NJU7295F1-C-T, Ta=-40 C to 105 C
NJU7295F1-D
7
10
14
ms
6
-
14
NJU7295F1-D-T, Ta=-40 C to 105 C
NJU7295F1-A
1.05
1.25
1.43
ms
1.0
-
1.5
NJU7295F1-A-T, Ta=-40 C to 105 C
NJU7295F1-B
7
10
14
ms
6
-
14
NJU7295F1-B-T, Ta=-40 C to 105 C
NJU7295F1-C
7
10
14
ms
6
-
14
NJU7295F1-C-T, Ta=-40 C to 105 C
NJU7295F1-D
-
30
100
µs
-
-
120
NJU7295F1-D-T, Ta=-40 C to 105 C
Delay Time 1
t
d1
V
IN
=L H
Delay Time 2
t
d2
V
IN
=H L
Ver.2015-11-11
-3-
NJU7295
■
TEST CIRCUIT
●
Quiescent Current
●
Detection Voltage
A
HYS
V
DD
V
OUT
R1
V
IN
EXT
V
SS
R3
V
IN
HYS
V
DD
V
OUT
NJU7295
NJU7295
V
SS
EXT
V
V
R2
●
Output Current
●
HYS Pin Current
HYS
V
DD
NJU7295
V
SS
V
OUT
A
A
HYS
V
DD
NJU7295
V
SS
V
OUT
V
IN
EXT
V
IN
EXT
●
EXT Pin Input Voltage
●
Delay Time
HYS
V
DD
NJU7295
V
SS
V
OUT
V
IN
EXT
V
●
Minimum Operating Voltage
HYS
R1
R3
V
IN
R2
V
DD
NJU7295
V
SS
V
OUT
EXT
V
RL
-4-
Ver.2015-11-11
NJU7295
■
FUNCTION DESCRIPTION
(1) Basic Operation
Input Voltage
(V
IN
)
Detection Voltage
(V
DET
)
Release Voltage *
*In case of not setting
the hysteresis voltage.
V
SS
(1)
When input voltage V
IN
is increased and
exceed the detection voltage V
DET
, after the
delay time which is fixed for each version, the
output voltage V
OUT
is switched from High
level to Low level.
(2) In the state of V
IN
is above the release
voltage V
DET
, the reset state is maintained.
The default release voltage V
DET
is same as
detection voltage V
DET
, although can be set
the hysteresis by inserting a resistor between
the V
IN
pin and the HYS pin.
(3) When V
IN
falls and it reaches
release voltage
V
DET
, after the delay time which is fixed for
each version, V
OUT
is switched from Low
level to High level.
Output Voltage
(V
OUT
)
V
SS
Delay Time1
(t
d1
)
Delay Time2
(t
d2
)
Ver.2015-11-11
-5-
嵌入式系统
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