MITSUMI
System Reset PST70XX
System Reset
Monolithic IC PST70XX Series
Outline
These low reset type ICs function in a variety of CPU systems and other logic systems, to detect power
supply voltage and reset the system accurately when power is turned on or interrupted.
They are ideal for use in battery check circuits for products using batteries, as they have ultra-low current
consumption and a high precision voltage detection function.
Features
1. High precision voltage detection
Vs2% max.
2. Ultra-low current consumption
I
CCH
=2A typ. I
CCL
=3A typ.
3. Low operating limit voltage
0.65V typ.
4. Hysteresis voltage provided in detection voltage
50mV typ.
5. Output current high for ON
30mA typ.
6. Detection voltage can be selected as desired within a range of 1.9V~4.6V
in 0.1V steps, as indicated below.
PST70XX
Detection voltage value
(Example: for 4.6V ....... PST7046)
Package
MMP-3A (PST70 M)
TO-92A (PST70 )
Applications
1. Reset circuits in microcomputers, CPUs and MPUs.
2. Logic circuit reset circuits.
3. Battery voltage check circuits.
4. Back-up power supply switching circuits.
5. Level detection circuits.
Pin Assignment
1
2
3
TO-92A
3
1
2
MMP-3A
(TOP VIEW)
1
V
CC
2
GND
3
V
OUT
1
V
CC
2
GND
3
V
OUT
MITSUMI
System Reset PST70XX
Absolute Maximum Ratings
(Ta=25
C)
Electrical Characteristics
(Ta=25
C) (Except where noted otherwise, resistance unit is
)
Equivalent Circuit Diagram
Item
Symbol
Rating
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 conditions Measurement circuit Min. Typ. Max.
Units
4.6~
Detection voltage
V
S
R
L
=470 V
CC
=H L
1
V
S
typ. 1.9 V
S
typ.
V
-2% (0.1V +2%
Step)
Hysteresis voltage
V
S
R
L
=470 V
CC
=L H L
1
30
50
100
mV
Detection voltage
V
S
/ T
R
L
=470 Ta=-20~+75
C
1
0.01
%/
C
temperature coefficient
Low-level output voltage
V
OL
V
CC
=V
S
min. -0.05V
1
0.2
0.4
V
R
L
=470
Output leakage current
I
OH
V
CC
=10.0V
1
0.1
A
Circuit current while on
I
CCL
V
CC
=V
S
min. -0.05V
1
3.0
6.0
A
R
L
=
Circuit current while off
I
CCH
V
CC
=V
S
typ. /0.85V
1
2.0
4.0
A
R
L
=
"H"transport delay time
t
PLH
R
L
=4.7k
7046~24
2
5
30
s
C
L
=100pF
7023~19
2
10
30
"L"transport delay time
t
PHL
R
L
=4.7k
7046~24
2
30
70
s
C
L
=100pF
7023~19
2
70
150
Operation limit voltage
V
OPL
R
L
=4.7k V
OL
<
= 0.4V
1
0.65
0.85
V
Output current while on 1
I
OL
1
V
CC
=V
S
min. -0.05V
1
8
30
mA
R
L
=0
Output current while on 2
I
OL
2
V
CC
=Vs min. -0.05V R
L
=0
1
5
mA
Ta=-20
C~+75
C
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