NJRC NJU7295F1-D-T System reset ic with delay circuit Datasheet

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 VOUT 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 VIN pin and the HYS pin.
■ FEATURES
● High Precision Detection Voltage
● Detection Voltage
● Reset Output Logic
● Delay Circuit (Internal Fixed type)
● Ultra Low Quiescent Current
● Supply Voltage Range
● External Input Pin
● Adjustable Hysteresis Voltage
● Output Type
● Package
■ PACKAGE OUTLINE
NJU7295F1
1.0% (Ta=25 C)
1.0V (default) and adjustable with external resistor
Reset Low output when VIN pin is detection voltage or more
*If required reset low output when VIN 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
■ PIN CONFIGURATION
VIN 1
VSS 2
EXT 3
Ver.2015-11-11
6 HYS
5 VOUT
4 VDD
Pin Function
1. VIN
:Input Voltage Pin
2. VSS
:Ground Pin
3. EXT :External Input Pin
4. VDD
:Supply Voltage Pin
5. VOUT :Output Pin
6. HYS :External Resistor Pin for setting Hysteresis Voltage
-1-
NJU7295
■ BLOCK DIAGRAM
VDD
HYS
VIN
Delay
Circuit
VSS
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
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
VDD
Input Voltage
VIN
Output Voltage
VOUT
HYS Pin Voltage
VHYS
EXT Pin Input Voltage
VEXT
Output Current
IOUT
HYS Pin Current
IHYS
Power Dissipation
Surge Current
Operating Temperature
Storage Temperature
PD
IIN_SRG
Topr
Tstg
VOUT
-40
-40
-40
-40
RATINGS
+7
VSS-0.3 to +7
VSS-0.3 to VDD+0.3
VSS-0.3 to VDD+0.3
VSS-0.3 to VDD+0.3
50
10
410(*1)
SOT-23-6-1
580(*2)
±2.5(*3)
-40 to +105
-40 to +125
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.)
(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 VOUT and no destruction
-2-
Ver.2015-11-11
NJU7295
■ ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
Detection Voltage
VDET
Quiescent Current
ISS
Output Current
IOUT
HYS Pin Current
IHYS
Average Temperature
Coefficient of Detection
Voltage
EXT Pin
High Level Voltage
EXT Pin
Low Level Voltage
VDET/ Ta
VEXT_H
VEXT_L
VIN Pin Resistance
RIN
EXT Pin Resistance
REXT
Operating Voltage
VOPL
Unless otherwise noted, VDD=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, VDS=0.5V
12
15
10
Nch, VDS=0.5V, Ta=-40 C to 105 C
mA
Pch, VDS=0.5V
7.5
11
6.0
Pch, VDS=0.5V, Ta=-40 C to 105 C
Nch, VDS=0.5V
7.5
12
6.0
Nch, VDS=0.5V, Ta=-40 C to 105 C
mA
Pch, VDS=0.5V
5.0
9.0
4.0
Pch, VDS=0.5V, Ta=-40 C to105 C
Ta=0 C to +85 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
Ta=-40 C to 105 C
-
100
-
0.67 VDD
0.7 VDD
10
8
0.5
0.4
1.5
1.5
20
1.0
-
VDD
VDD
0.33 VDD
0.3 VDD
5.5
5.5
ppm/ C
V
V
MΩ
MΩ
V
■ ELECTRICAL CHARACTERISTICS (Defined by each versions)
PARAMETER
SYMBOL
Delay Time 1
td1
VIN=L H
Delay Time 2
td2
VIN=H L
Ver.2015-11-11
Unless otherwise noted, VDD=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
-3-
NJU7295
■ TEST CIRCUIT
● Quiescent Current
● Detection Voltage
A
HYS
V DD
NJU7295
HYS
V OUT
R1
R3
EXT
V IN
V IN
V SS
V
● Output Current
HYS
V DD
NJU7295
V OUT
A
A
● EXT Pin Input Voltage
V OUT
EXT
V
V SS
V DD
NJU7295
V OUT
EXT
V SS
● Delay Time
V DD
NJU7295
V OUT
EXT
V IN
HYS
V IN
V SS
HYS
NJU7295
● HYS Pin Current
EXT
V IN
R2
V DD
V
V SS
● Minimum Operating Voltage
HYS
R1
R3
V IN
R2
-4-
V DD
NJU7295
V OUT
EXT
V SS
V
RL
Ver.2015-11-11
NJU7295
■ FUNCTION DESCRIPTION
(1) Basic Operation
Input Voltage
(VIN)
Detection Voltage
Release Voltage *
(VDET)
*In case of not setting
the hysteresis voltage.
VSS
Output Voltage
(VOUT)
(2) In the state of VIN is above the release
voltage VDET, the reset state is maintained.
The default release voltage VDET is same as
detection voltage VDET, although can be set
the hysteresis by inserting a resistor between
the VIN pin and the HYS pin.
(3) When VIN falls and it reaches release voltage
VDET, after the delay time which is fixed for
each version, VOUT is switched from Low
level to High level.
VSS
Ver.2015-11-11
(1) When input voltage VIN is increased and
exceed the detection voltage VDET, after the
delay time which is fixed for each version, the
output voltage VOUT is switched from High
level to Low level.
Delay Time1
Delay Time2
(td1)
(td2)
-5-
NJU7295
■ TYPICAL APPLICATION
R1, R2: Adjust the detection voltage by
resistor divider
R3:
Setting the hysteresis voltage
CIN:
To prevent malfunction due to noise
(Recommend about 10pF to 1000pF)
EXT:
The input logic signals from other
power line
● Adjusting of Detection Voltage
The Detection voltage of NJU7295 is fixed as 1.0V (typ.) internally, although it can be adjusted to a desired Detection
Voltage by connecting external resistor (R1,R2) to a VIN pin.
When adjusting to a desired Detection Voltage, it's necessary to consider VIN pin resistance RIN. (20 MΩ typ.)
● Setting of Hysteresis Voltage
The NJU7295 doesn't have the Hysteresis Voltage between the Release Voltage and Detecting Voltage in default.
It's able to set the Hysteresis Voltage optionally by connecting dividing resistor between the VIN-HYS pin.
Detection Voltage
Hysteresis Voltage =
VDET
R1( R 2 RIN )
VDET
RIN R 2
R1
VDET
R3
R1
VDD
R3
Release Voltage = Detection Voltage - Hysteresis Voltage
● External input Pin
If inputs the logic signal from other power line(e.g. other NJU7295) into the EXT pin, it can be kept the status of the
output "High level" and ignoring the status of detection voltage VDET.
When inputs a low level signal into the EXT pin, VOUT is kept high level. It is useful for priority setting of reset signal
when monitoring multiplex power supply systems.
If do not use the External input, the EXT pin should be connected to VDD or Open.
-6-
Ver.2015-11-11
NJU7295
■ TYPICAL CHARACTERISTICS
NJU7295
Detection Voltage vs Temperature
1.1
Detection Voltage :VDET [V]
@VDD=3.3V
1.05
1
0.95
0.9
-50
-25
0
25
50
75
Temperature [ºC]
100
NJU7295
NJU7295
Quiescent Current vs Supply Voltage
3
Queiscent Current vs Temperature
3
2.5
Quiescent Current :ISS [μA]
Quiescent Current :ISS [μA]
@Ta=25 C
No Signal
2
1.5
1
0.5
@VDD=3.3V
No Signal
2.5
2
1.5
1
0.5
0
0
1.5
2
30
2.5
3
3.5
4
4.5
Supply Voltage :VDD [V]
5
5.5
-50
-25
0
25
50
75
Temperature [ºC]
100
NJU7295
NJU7295
VIN Pin Resistance vs Temperature
EXT Pin Resistance vs Temperature
2
125
1.8
EXT Pin Resistance REXT [MΩ]
28
VIN Pin Resistance :RIN [MΩ]
125
26
24
22
20
18
16
14
12
10
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-50
Ver.2015-11-11
-25
0
25
50
75
Temperature [ºC]
100
125
-50
-25
0
25
50
75
Temperature [ºC]
100
125
-7-
NJU7295
NJU7295-A/C/D
Delay Time 1 vs Temperature
14
@Ta=25 C
VIN=L H
@:VDD=3.3V
VIN=L H
13
12
Delay Time1 :td1 [ms]
Delay Time1 :td1 [ms]
13
NJU7295-A/C/D
Delay Time1 vs Supply Voltage
14
11
10
9
8
12
11
10
9
8
7
7
6
6
1.5
2
2.5
3
3.5
4
4.5
Supply Voltage :VDD [V]
5
5.5
-50
-25
0
25
50
75
Temperature [ºC]
@:VDD=3.3V
VIN=L H
24
23
23
Delay Time1 :td1 [mS]
Delay time1 :td1 [mS]
Delay time1 vs Temperature
25
@Ta=25 C
VIN=L H
24
22
21
20
19
18
22
21
20
19
18
17
17
16
16
15
15
1.5
2
2.5
3
3.5
4
4.5
Supply Voltage :VDD [V]
1.5
5
5.5
-50
0
25
50
75
Temperature [ºC]
NJU7295-A
NJU7295-A
Delay Time2 vs Temperature
1.5
100
125
100
125
@:VDD=3.3V
VIN=H L
Delay Time2 :td2 [mS]
1.4
Delay time2 :td2 [mS]
-25
Delay Time2 vs Supply Voltage
@Ta=25 C
VIN=H L
1.3
1.2
1.1
1.4
1.3
1.2
1.1
1
1
1.5
-8-
125
NJU7295-B
NJU7295-B
Delay Time1 vs Supply Voltage
25
100
2
2.5
3
3.5
4
4.5
Supply Voltagge :VDD [V]
5
5.5
-50
-25
0
25
50
75
Temperature [ºC]
Ver.2015-11-11
NJU7295
14
NJU7295-B/C
Delay Time 2 vs Temperature
14
@Ta=25 C
VIN=H L
13
@:VDD=3.3V
VIN=H L
13
12
Delay Time2 :td2 [ms]
Delay Time2 :td2 [ms]
NJU7295-B/C
Delay Time2 vs Supply Voltage
11
10
9
8
7
12
11
10
9
8
7
6
6
1.5
2
2.5
3
3.5
4
4.5
Supply Voltage :VDD [V]
5
5.5
-50
-25
0
25
50
75
Temperature [ºC]
NJU7295-D
125
100
125
@:VDD=3.3V
VIN=H L
35
Delay Time2 :td2 [ S]
Delay Time2 :td2 [ S]
100
Delay Time2 vs Temperature
40
@Ta=25 C
VIN=H L
30
25
20
35
30
25
20
1.5
2
2.5
3
3.5
4
4.5
Supply Voltage :VDD [V]
5
5.5
-50
-25
Nch Output Current vs Temperature
30
0
25
50
75
Temperature [ºC]
NJU7295
NJU7295
Pch Output Current vs Temperature
30
@:VDS=0.5V
Pch Output Current :IOUT [mA]
@:VDS=0.5V
Nch Output Current :IOUT [mA]
125
NJU7295-D
Delay Time2 vs Supply Voltage
40
100
25
20
15
10
5
0
25
20
15
10
5
0
-50
Ver.2015-11-11
-25
0
25
50
75
Temperature [ºC]
100
125
-50
-25
0
25
50
75
Temperature [ºC]
-9-
NJU7295
30
NJU7295
NJU7295
Nch HYS Current vs Temperature
Pch HYS Current vs Temperature
30
@:VDS=0.5V
25
Pch HYS Current :IHYS [mA]
Nch HYS Current :IHYS [mA]
@:VDS=0.5V
20
15
10
5
0
25
20
15
10
5
0
-50
-25
0
25
50
75
Temperature [ºC]
100
125
-50
-25
0
25
50
75
Temperature [ºC]
100
125
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including the
industrial rights.
- 10 -
Ver.2015-11-11
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