MITSUMI
IC for System Reset PST600
IC for System Reset
Monolithic IC PST600
Outline
September 6, 2001
This IC functions in a variety of CPU systems and other logic systems, to detect supply voltage and reset the
system accurately when the power is turned on or interrupted. There are other system reset ICs available
such as PST572(conventional). In PST600, the circuit current increases or decreases during power-on
tracking a load current. This is a low-reset type system reset IC with low-current consumption during power-
on and power-off.
Packages
*
Equivalent Circuit
Pr
1. Reset circuits for microcomputers, CPUs and MPUs
2. Reset circuits for logic circuits
3. Battery voltage check circuits
4. Back-up power supply switching circuits
5. Level detection circuits
od
uc
Applications
ts
to
MMP-3A (PST600 M)
TO-92A (PST600 )
The box represents a rank of detection voltage.
be
di
1. Low current consumption during power-on and power-off as the circuit current increases or decreases
during power-on tracking a load current
No load : I
CCL
=7µA typ.; I
CCH
=5µA typ.
2. Low operating limit voltage
0.65V typ.
3. Hysteresis voltage provided for detection voltage 50mV typ.
4. 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.
sc
on
tin
ue
Features
d
MITSUMI
IC for 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
(TOP VIEW)
Allowable loss
Pd
sc
on
*
*
tin
*
(Vs typ.-0.4V)
Item
Storage temperature
Operating temperature
Power supply voltage
Symbol
T
STG
T
OPR
V
CC
max.
Ratings
-40~+125
-20~+75
-0.3~10
200 (MMP-3A)
300 (TO-92A)
Electrical Characteristics
Item
(Ta=25
°
C) (unless otherwise indicated resistance unit is
Ω)
Measurement
circuit
Symbol
di
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
be
ue
Units
°
C
°
C
V
mW
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
V
mV
%/
°
C
V
µA
µA
µA
µs
µs
V
mA
mA
20
10
8
6
ts
Detection voltage
od
uc
Hysteresis voltage
Detection voltage
temperature coefficient
Low level output voltage
Output leak current
Pr
to
Vs
1
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
R
L
=470, Ta=-20
°
C~+75
°
C
V
CC
=Vs min. -0.05V, R
L
=470
V
CC
=10V
V
CC
=Vs min.
I
OL
=0mA
-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
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
*
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)
d
Absolute Maximum Ratings
(Ta=25
°
C)
MITSUMI
IC for System Reset PST600
Measurement Circuit
[1]
[2]
V
S
4.9
4.1
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.)
be
7
8
Ta=-25
°
C
Ta=25
°
C
Ta=75
°
C
1
2
3
4
5
6
di
V
O
L
350
(mV)
300
250
200
-40
-20
0
20
40
60
80
sc
on
450
400
V
O
L vs. Ta
V
S
vs. Ta
80
70
60
to
V
CC
(V)
V
S
vs. Ta
4.7
4.6
uc
ts
od
V
S
50
(mV)
40
30
V
S
(V)
4.5
4.4
4.3
4.2
Pr
20
-40
-20
0
20
40
60
80
-40
tin
-20
0
20
*
The input model is an example of PST600C (MMP-3P).
ue
Ta (
°
C)
40
0V
d
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
IC for 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
Ta (
°
C)
Application Circuits
1. Normal hard reset
be
to
··
=C
L
di
Delay Time (tPLH)
R
L
V
[
ln ————————————————
]
+0.040 (ms)
+0.2)
V - (VS
CC
CC
CPU
2. Manual Reset
Pr
od
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.
uc
ts
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.
sc
on
tin
I
CC
L
(µA)
ue
d
MITSUMI
3. Battery Checker (LED ON for High voltage)
IC for System Reset PST600
Note : When V
CC
line impedance is high, connect a
capacitor between IC Pins 1 and 2.
Pr
od
uc
ts
to
be
di
sc
on
Note : When V
CC
line impedance is high, connect a
capacitor between IC Pins 1 and 2.
tin
ue
d
4. Battery Checker (LED ON for Low voltage)
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