MITSUMI
IC for System Reset PST573
IC for System Reset
Monolithic IC PST573
Outline
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. It is a high-reset type system reset IC with
ultra-low current consumption developed using high-resistance process and current-minimizing circuit design
technology.
Features
1. Ultra-low current consumption ICCH=450µA typ. ICCL=1µA typ.
2. Low operating limit voltage 0.65V typ.
3. Large output current during power-on
-
6mA typ.
4. Hysteresis voltage provided for detection voltage 50mV typ.
5. 10 ranks of detection voltages are available. PST573 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.
Packages
MMP-3A (PST573 M)
TO-92A (PST573 )
*
The box represents a rank of detection voltage.
Applications
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
Pin Assignment
123
TO
-
92A
1 VCC
2 GND
3 V
OUT
31
2
MMP-3A
(TOP VIEW)
1 VCC
2 GND
3 V
OUT
November 21, 2001
Products to be discontinued
MITSUMI
IC for System Reset PST573
Equivalent Circuit Diagram
Absolute Maximum Ratings
(Ta=25°C)
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)
Electrical Characteristics
(Ta=25°C) (Except where noted otherwise, resistance unit is Ω)
Item Symbol
Measurement
Measurement conditions Min. Typ. Max. Units
circuit
PST573C 4.3 4.5 4.7
PST573D 4.0 4.2 4.4
PST573E 3.7 3.9 4.1
R
L=4.7k
PST573F 3.4 3.6 3.8
Detection voltage V
S 1VOL
<
=
V
CC
-
0.4V
PST573G 3.1 3.3 3.5
V
V
CC=H L
PST573H 2.9 3.1 3.3
PST573I 2.75 2.90 3.05
PST573J 2.55 2.70 2.85
PST573K 2.35 2.50 2.65
PST573L 2.15 2.30 2.45
Hysteresis voltage V
S 1
R
L=4.7k
25 50 100 mV
V
CC=L H L
Detection voltage R
L=4.7k
V
S/T 1 ±0.01 %/°C
temperature coefficient Ta=
-
20°C~+75°C
High level output voltage
VOH 1
V
CC=VS min.
-
0.05V VCC
V
R
L=4.7k
-
0.4
Output leakage current I
OH 1VCC=7.5V 0.1 µA
Circuit current while on I
CCL 1
V
CC=VS min.
-
0.05V
450 700 µA
R
L=∞
Circuit current while off I
CCH 1
V
CC=VS typ. /0.85V
1.0 1.8 µA
R
L=∞
"H"transport delay time tpLH 2
R
L=4.7k
*
1
25 60 µs
C
L=100pF
"L"transport delay time tpHL 2
R
L=4.7k
*
1
820 µs
C
L=100pF
Operation limit voltage VopL 1
R
L=4.7k
0.65 0.85 V
V
OL
>
=
V
CC
-
0.4V
Output current while on 1
IOL I1
V
CC=VS min.
-
0.05V
-
2.0
-
6.0 mA
R
L=0
Output current while on 2
IOL II 1
Ta=
-
20°C~+75°C
*
2
-
1.5 mA
R
L=0
*
1 : tpLH : VCC=(VS typ.
-
0.4V) (VS typ.+0.4V), tpHL : VCC=(VS typ.+0.4V) (VS typ.
-
0.4V)
*
2 : V
CC=VS min.
-
0.15V
Products to be discontinued