MITSUMI
System Reset PST600
System Reset
Monolithic IC PST600
Outline
This IC operates in a variety of CPU systems and other logic systems by detecting power supply voltage, so
that the system can be reset accurately when power is turned on or when power is momentarily cut. PST572
and others perform the same function as does this series, but this IC is a low reset type system resetting IC
which follows load current so that circuit current flow increases for ON, and has low current consumption for
both ON and OFF.
Features
1. Follows load current so that circuit current flow increases for ON, and has low current consumption for
both ON and OFF.
No load : I
CCL
=7µA typ.; I
CCH
=5µA typ.
2. Low operating limit voltage
0.65V typ.
3. Hysteresis voltage provided in detection voltage 50mV typ.
4. The following 10 ranks of detection voltages are available.
PST600 C : 4.5V typ.
H : 3.1V typ.
D : 4.2V typ.
I : 2.9V typ.
E : 3.9V typ.
J : 2.7V typ.
F : 3.6V typ.
K : 2.5V typ.
G : 3.3V typ.
L : 2.3V typ.
Package
MMP-3A (PST600 M)
TO-92A (PST600 )
contains detection voltage rank.
*
Applications
1. Microcomputers, CPU, MPU reset circuits
2. Logic circuit reset circuits
3. Battery voltage check circuits
4. Back-up power supply switching circuits
5. Level detection circuits
Equivalent Circuit
MITSUMI
System Reset PST600
Pin Assignment
1
2
3
1
2
3
V
CC
GND
V
OUT
1
3
1
2
V
CC
GND
V
OUT
2
3
TO-92A
MMP-3A
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Power supply voltage
Allowable loss
(Ta=25
°
C)
Symbol
T
STG
T
OPR
V
CC
max.
Pd
Ratings
-40~+125
-20~+75
-0.3~10
200 (MMP-3A)
300 (TO-92A)
Units
°
C
°
C
V
mW
Electrical Characteristics
Item
(Ta=25
°
C) (unless otherwise indicated resistance unit is
Ω)
Measurement
circuit
Symbol
Measurement conditions
PST600C
PST600D
PST600E
PST600F
R
L
=470
PST600G
V
OL
< 0.4V
=
PST600H
V
CC
=H L
PST600I
PST600J
PST600K
PST600L
R
L
=470, V
CC
=L H L
R
L
=470, Ta=-20
°
C~+75
°
C
V
CC
=Vs min. -0.05V, R
L
=470
V
CC
=10V
I
OL
=0mA
V
CC
=Vs min.
-0.05V
I
OL
=8mA
V
CC
=Vs typ./0.85V, R
L
=∞
R
L
=4.7k, C
L
=100pF 1
R
L
=4.7k, C
L
=100pF 1
R
L
=4.7k, V
O
L < 0.4V
=
V
CC
=Vs min. -0.05V, R
L
=0
Ta=-20
°
C~+75
°
C, R
L
=0 2
Min. Typ. Max. Units
4.3
4.0
3.7
3.4
3.1
2.9
2.75
2.55
2.35
2.15
30
4.5
4.2
3.9
3.6
3.3
3.1
2.90
2.70
2.50
2.30
50
±0.01
0.3
7
50
5
40
20
0.65
0.4
±0.1
14
130
10
80
40
0.85
4.7
4.4
4.1
3.8
3.5
3.3
3.05
2.85
2.65
2.45
100
Detection voltage
Vs
1
V
Hysteresis voltage
Detection voltage
temperature coefficient
Low level output voltage
Output leak current
Circuit current for ON
Circuit current for OFF
H transmission delay time
L transmission delay time
Operating limit voltage
Output current 1 for ON
Output current 2 for ON
Vs
Vs/ T
V
OL
I
OH
I
CCL
I
CCH
t
PLH
t
PHL
VopL
I
OL
1
I
OL
2
1
1
1
1
1
1
2
2
1
1
1
mV
%/
°
C
V
µA
µA
µA
µS
µS
V
mA
mA
*
*
20
10
8
6
*
*
1 t
*
2 V
PLH
: V
CC
= (Vs typ. -0.4V)
CC
=Vs min. -0.15V
(Vs typ.+0.4V), t
PLH
: V
CC
= (Vs typ.+0.4V)
(Vs typ.-0.4V)
MITSUMI
System Reset PST600
Measurement Circuit
[1]
[2]
V
S
4.9
4.1
0V
*
The input model is an example of PST600C (MMP-3P).
Characteristics
V
CC
vs. V
OUT
8
7
6
5
Vout
4
(V)
3
2
1
0
0
(PST600C is used as the representative model for characteristics examples.)
V
O
L vs. Ta
450
400
Ta=-25
°
C
Ta=25
°
C
Ta=75
°
C
1
2
3
4
5
6
7
8
V
O
L
350
(mV)
300
250
200
-40
-20
0
20
40
60
80
V
CC
(V)
Ta (
°
C)
V
S
vs. Ta
80
70
60
V
S
vs. Ta
4.7
4.6
V
S
50
(mV)
40
30
20
-40
-20
0
20
40
60
80
V
S
(V)
4.5
4.4
4.3
4.2
-40
-20
0
20
40
60
80
Ta (
°
C)
Ta(
°
C)
I
CC
L vs. I
O
L
100
80
60
40
20
0
0
2
4
6
8
10
12
I
CC
H vs. Ta
8
7
6
5
4
3
-40
-20
0
20
40
60
80
I
CC
L
(µA)
I
CC
H
(µA)
I
O
L (mA)
Ta(
°
C)
MITSUMI
System Reset PST600
I
O
L vs. Ta
60
50
40
30
20
10
-40
-20
0
20
40
60
80
V
O
L vs. I
O
L
500
400
I
O
L
(mA)
V
O
L
(mV)
300
200
100
0
0
2
4
6
8
10
12
Ta (
°
C)
I
O
L (mA)
I
CC
L (I
O
L=0mA) vs. Ta
9
8
7
6
5
4
-40
-20
0
20
40
60
80
I
CC
L
(µA)
Ta (
°
C)
Application Circuits
1. Normal hard reset
Delay Time (tPLH)
··
=C
L
R
L
V
[
ln ————————————
]
+0.040 (mS)
+0.2)
V - (VS
CC
CC
CPU
Vs
CPU
: CPU, MPU reset threshold voltage
C
L
: µF
R
L
: kΩ
Voltage : V
Note : When V
CC
line impedance is high, connect a
capacitor between IC Pins 1 and 2.
2. Manual Reset
Note : Prevent Manual SW chattering by using R
L
, C
L
and Rm. Rm setting conditions are as follows :
Rm
<
1/20 R
L
=
Note : When V
CC
line impedance is high,connect a
capacitor between IC Pins 1 and 2.
MITSUMI
3. Battery Checker (LED ON for High voltage)
System Reset PST600
Note : When V
CC
line impedance is high, connect a
capacitor between IC Pins 1 and 2.
4. Battery Checker (LED ON for Low voltage)
Note : When V
CC
line impedance is high, connect a
capacitor between IC Pins 1 and 2.
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