MITSUMI
IC for System Reset PST70XX
IC for System Reset
Monolithic IC PST70XX Series
Outline
May 21, 2002
This IC is a low-reset type system reset IC and 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.
It includes a high-precision voltage detection function with ultra-low current consumption and is ideal for
voltage check circuits for products using a battery.
Features
1.
2.
3.
4.
5.
6.
High-precision voltage detection
Vs±2% max.
Ultra-low current consumption
I
CCH
=2µA typ. I
CCL
=3µA typ.
Low operating limit voltage
0.65V typ.
Hysteresis voltage provided for detection voltage
50mV typ.
Large output current during power-on
30mA typ.
Detection voltage can be selected as desired within a range of 1.9 to 4.6V
by 0.1V step, as indicated below.
PST70XX
Detection voltage value
(Example: for 4.6V ....... PST7046)
Packages
MMP-3A (PST70
M)
TO-92A (PST70
)
The box represents a rank of detection voltage.
*
Applications
1.
2.
3.
4.
5.
Reset circuits for microcomputers, CPUs and MPUs
Reset circuits for logic circuits
Battery voltage check circuits
Back-up power supply switching circuits
Level detection circuits
Pin Assignment
1
2
3
V
CC
GND
V
OUT
1
3
1
2
V
CC
GND
V
OUT
2
3
1
2
3
TO-92A
MMP-3A
(TOP VIEW)
MITSUMI
IC for System Reset PST70XX
Equivalent Circuit Diagram
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
Rating
-40~+125
-20~+75
-0.3~+10
200 (MMP-3A)
300 (TO-92A)
Units
°
C
°
C
V
mW
Electrical Characteristics
Item
(Ta=25
°
C) (Except where noted otherwise, resistance unit is
Ω)
Symbol Measurement conditions Measurement circuit Min. Typ. Max. Units
4.6~
V
S
typ. 1.9 V
S
typ.
-2% (0.1V +2%
Step)
30
50
±0.01
0.2
0.4
0.1
3.0
2.0
5
10
30
70
0.65
8
5
30
6.0
4.0
30
30
70
150
0.85
100
Detection voltage
V
S
R
L
=470 V
CC
=H
L
1
V
Hysteresis voltage
Detection voltage
temperature coefficient
Low-level output voltage
Output leakage current
Circuit current while on
V
S
/
V
S
T
R
L
=470 V
CC
=L
H
L
1
1
1
1
1
1
2
2
2
2
1
1
1
mV
%/
°
C
V
µA
µA
µA
µs
µs
V
mA
mA
R
L
=470 Ta=-20~+75
°
C
V
CC
=V
S
min. -0.05V
R
L
=470
V
CC
=10.0V
V
CC
=V
S
min. -0.05V
R
L
=∞
V
CC
=V
S
typ. /0.85V
R
L
=∞
R
L
=4.7k
C
L
=100pF
R
L
=4.7k
C
L
=100pF
7046~24
7023~19
7046~24
7023~19
V
OL
I
OH
I
CCL
I
CCH
t
PLH
t
PHL
V
OPL
I
OL
1
I
OL
2
Circuit current while off
"H"transport delay time
"L"transport delay time
Operation limit voltage
Output current while on 1
R
L
=4.7k V
OL
< 0.4V
=
V
CC
=V
S
min. -0.05V
R
L
=0
V
CC
=Vs min. -0.05V R
L
=0
Ta=-20
°
C~+75
°
C
Output current while on 2
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