MITSUMI
System Reset PST90XX
System Reset
Monolithic IC PST90XX Series
Outline
The function of this low voltage detection type IC is to accurately reset systems after detecting the supply
voltage at the time of switching power on and instantaneous power off in various CPU and other logic
systems. This IC, with its super low consumption current and high precision voltage detection capacity, is
most suited as a voltage check circuit for a number of products which use batteries.
Features
1. High precision voltage detection
V
S
±2.5% max.
2. Super low current consumption
I
CCH
=1.5µA typ. I
CCL
=1µA typ.
3. Low operating threshold voltage
0.7V max.
4. Hysteresis voltage is provided as a detect voltage
Vs 5% typ.
5. The detect voltage can be selected at your discretion at 0.1 V step within the range of 0.8 to 1.8V by the
following stipulation method.
PST90XX
Detected voltage value
(Example : for 0.8V ······ PST9008)
Package
TO-92A (PST90
SOT-25A (PST90
)
N)
Applications
1. Reset circuits for microcomputers, CPU and MPU.
2. Reset circuit for logic circuitry.
3. Battery voltage check circuit.
4. Circuit for changing over to backup battery.
5. Level detecting circuit.
Pin Assignment
1
1
2
3
1
2
3
V
OUT
V
CC
GND
1
2
3
5
4
2
3
4
5
SOT-25A
(TOP VIEW)
Note : The pin 2 of SOT-25 package is a SUB terminal. Connect it to GND.
TO-92A
NC
SUB
GND
V
OUT
V
CC
MITSUMI
System Reset PST90XX
Equivalent Circuit Diagram
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Supply Voltage
Allowable loss
(Ta=25
°
C)
Symbol
T
STG
T
OPR
V
CC
max.
Pd
Ratings
-40~+125
-20~+75
-0.3~10
150 (SOT-25A)
300 (TO-92A)
Units
°
C
°
C
V
mW
Electrical Characteristics
Item
Symbol
(Ta=25
°
C) (The unit of resistance is
Ω
unless otherwise indicated.)
Measurement
Circuit
Measurement conditions
PST9008
PST9009
PST9010
PST9011
PST9012
PST9013
PST9014
PST9015
PST9016
PST9017
PST9018
Min.
Typ.
Max.
Unit
Detection Voltage
V
S
1
R
L
=4.7k
V
CC
=H L
V
OL
< 0.4V
=
Hysteresis Voltage
V
S
1
1
1
1
1
1
2
2
1
1
1
Detection Voltage
V
S
/ T
Temperature Coefficient
Low Level
V
O
L
Output Voltage
Output Leakage Current
I
O
H
Circuit Current at On Time
I
CCL
Circuit Current at
I
CCH
OFF Time
"H" Transmission Delay Time
tpLH
"L" Transmission Delay Time
tpHL
Operating Threshold Voltage
VopL
Output Current at
I
O
L1
On Time 1
Output Current at
I
O
L2
On Time 2
R
L
=4.7k
V
CC
=L H L
R
L
=4.7k
Ta=-20
°
C~+75
°
C
V
CC
=Vs min. -0.02V
R
L
=4.7k
V
CC
=10V
V
CC
=Vs min. -0.02V I
OL
=0mA
V
CC
=1.5V, R
L
=∞
Vs=0.8~1.2
V
CC
=3.0V, R
L
=∞
Vs=1.3~1.8
C
L
=100pF, R
L
=4.7k
C
L
=100pF, R
L
=4.7k
R
L
=4.7k, V
OL
< 0.4V
=
R
L
=0
V
CC
=Vs min. -0.02V
V
CC
=Vs min. -0.02V
R
L
=0, Ta=-20
°
C~+75
°
C
0.8
0.9
1.0
1.1
1.2
-2.5%
+2.5%
1.3
typ.
typ.
1.4
1.5
1.6
1.7
1.8
V
S
V
S
typ.
V
S
0.5
0.05
2
±0.01
0.2
0.4
0.1
2.0
2.0
50
80
0.70
V
mV
%/
°
C
V
µA
µA
µA
µs
µs
V
mA
mA
1.0
1.0
10
20
20
50
0.65
0.3
0.2
MITSUMI
System Reset PST90XX
Equivalent Circuit
Characteristics
V
S
vs. Ta
0.83
0.82
0.81
(Example: PST9008)
I
CCL
vs. Ta
3
2.5
2
V
S
(V)
0.80
0.79
0.78
0.77
-20-10 0 10 20 30 40 50 60 70
I
CCL
1.5
(µA)
1
0.5
0
-20-10 0 10 20 30 40 50 60 70
Ta (
°
C)
Ta (
°
C)
V
S
vs. Ta
70
60
50
40
30
20
10
0
V
O
pL vs. Ta
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
S
(mV)
VopL
(V)
-20-10 0 10 20 30 40 50 60 70
-20-10 0 10 20 30 40 50 60 70
Ta (
°
C)
Ta (
°
C)
I
CCH
vs. Ta
3
2.5
2
I
CCH
1.5
(µA)
1
0.5
0
-20-10 0 10 20 30 40 50 60 70
Ta (
°
C)
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