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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.; ICCH=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
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MITSUMI
System Reset PST600
Absolute Maximum Ratings
(Ta=25°C)
Electrical Characteristics
(Ta=25
°
C) (unless otherwise indicated resistance unit is Ω)
*
1 tPLH : VCC= (Vs typ. -0.4V) (Vs typ.+0.4V), tPLH : VCC= (Vs typ.+0.4V) (Vs typ.-0.4V)
*
2 VCC=Vs min. -0.15V
Pin Assignment
123
TO-92A
31
2
MMP-3A
1 VCC
2 GND
3 V
OUT
1 VCC
2 GND
3 V
OUT
Item Symbol Ratings Units
Storage temperature T
STG
-
40~+125
°
C
Operating temperature T
OPR
-
20~+75
°
C
Power supply voltage V
CC max.
-
0.3~10 V
Allowable loss Pd
200 (MMP-3A)
mW
300 (TO-92A)
Item Symbol
Measurement
Measurement conditions Min. Typ. Max. Units
circuit
PST600C 4.3 4.5 4.7
PST600D 4.0 4.2 4.4
PST600E 3.7 3.9 4.1
R
L=470
PST600F 3.4 3.6 3.8
Detection voltage Vs 1 V
OL
<
=
0.4V
PST600G 3.1 3.3 3.5
V
V
CC=H L
PST600H 2.9 3.1 3.3
PST600I 2.75 2.90 3.05
PST600J 2.55 2.70 2.85
PST600K 2.35 2.50 2.65
PST600L 2.15 2.30 2.45
Hysteresis voltage Vs 1 R
L=470, VCC=L H L 30 50 100 mV
Detection voltage
temperature coefficient
Vs/ T 1 R
L=470, Ta=
-
20°C~+75°C ±0.01 %/°C
Low level output voltage V
OL 1
VCC=Vs min. -0.05V, RL=470
0.3 0.4 V
Output leak current I
OH 1VCC=10V ±0.1 µA
Circuit current for ON I
CCL 1
V
CC=Vs min. IOL=0mA 7 14
µA
-
0.05V IOL=8mA 50 130
Circuit current for OFF I
CCH 1VCC=Vs typ./0.85V, RL=∞ 510µA
H transmission delay time t
PLH 2RL=4.7k, CL=100pF
*
1 204080µS
L transmission delay time t
PHL 2RL=4.7k, CL=100pF
*
1 102040µS
Operating limit voltage VopL 1 R
L=4.7k, VOL
<
=
0.4V 0.65 0.85 V
Output current 1 for ON I
OL 11VCC=Vs min.
-
0.05V, RL=0 8 mA
Output current 2 for ON I
OL 21
Ta=-20°C
~+75°C
, RL=0 *2
6mA
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MITSUMI
System Reset PST600
Measurement Circuit
[1] [2]
Characteristics
(PST600C is used as the representative model for characteristics examples.)
-
40-20 0 20 40 60 80
4.2
4.3
4.4
4.5
4.6
4.7
VS
(V)
Ta(
°
C)
V
S
(mV)
Ta (°C)
-
40-20 0 20 40 60 80
20
30
40
50
60
70
80
VS vs. Ta VS vs. Ta
VOL
(mV)
Ta (
°
C)
-
40-20 0 20 40 60 80
200
250
300
350
400
450
Ta
=
-
25°C
Ta=25°C
Ta=75°C
8
7
6
5
4
3
2
1
0012345678
Vout
(V)
V
CC (V)
VCC vs. VOUT VOL vs. Ta
VS
0V
4.9
4.1
*
The input model is an example of PST600C (MMP-3P).
ICCH
(µA)
Ta(
°
C)
-
40-20 0 20 40 60 80
3
4
5
6
7
8
ICCL
(µA)
I
OL (mA)
02
4681012
0
20
40
60
80
100
ICCL vs. IOLICCH vs. Ta
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MITSUMI
System Reset PST600
ICCL
(µA)
Ta (
°
C)
-
40-20 0 20 40 60 80
4
5
6
7
8
9
ICCL (IOL=0mA) vs. Ta
VOL
(mV)
I
OL (mA)
02
4681012
0
100
200
300
400
500
IOL
(mA)
Ta (
°
C)
-
40-20 0 20 40 60 80
10
20
30
40
50
60
IOL vs. Ta VOL vs. IOL
Application Circuits
1. Normal hard reset
Delay Time (tPLH)
C
L : µF Vs CPU : CPU, MPU reset threshold voltage
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 RL , CL
and Rm. Rm setting conditions are as follows :
Rm
<
=
1/20 R
L
Note : When VCC line impedance is high,connect a
capacitor between IC Pins 1 and 2.
V
CC
·
=
·
C
L RL
[
ln
————————————
]
+0.040 (mS)
V
CC
-
(VS CPU+0.2)
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MITSUMI
System Reset PST600
3. Battery Checker (LED ON for High voltage)
Note : When VCC line impedance is high, connect a
capacitor between IC Pins 1 and 2.
4. Battery Checker (LED ON for Low voltage)
Note : When VCC line impedance is high, connect a
capacitor between IC Pins 1 and 2.
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