MITSUMI
System Reset PST574
System Reset
Monolithic IC PST574
Outline
This IC functions 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. This ultra-low current consumption low
reset type system reset IC has a built-in fixed delay time generating circuit. It is ideal for use in multi-CPU
systems because a fast-rising output waveform can be obtained.
Features
Package
Applications
Pin Assignment
1. Ultra-low current consumption ICCH=7.5µA typ. ICCL=400µA typ.
2. Low operating limit voltage 0.65V typ.
3. Output current high for ON 30mA typ.
4. Hysteresis voltage provided in detection voltage 50mV typ.
5. Built-in delay circuit with excellent delay time 50mV typ.
temperature characteristics
6. 10 ranks of detection voltage PST574 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.
MMP
-
3A (PST574 M)
TO
-
92A (PST574 )
*
contains detection voltage rank .
1. Reset circuits in microcomputers, CPUs and MPUs (especially multi-CPU sets)
2. Logic circuit reset circuits.
3. Battery voltage check circuits.
4. Back-up power supply switching circuits.
5. Level detection circuits.
123
TO
-
92A
31
2
MMP-3A
1 VCC
2 GND
3 V
OUT
1 VCC
2 GND
3 V
OUT
Products to be discontinued
MITSUMI
System Reset PST574
Equivalent Circuit Diagram
Absolute Maximum Ratings
(Ta=25°C)
Electrical Characteristics
(Ta=25°C) (Except where noted otherwise, resistance unit is Ω)
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
Measurement conditions Min. Typ. Max. Units
circuit
PST574C 4.3 4.5 4.7
PST574D 4.0 4.2 4.4
PST574E 3.7 3.9 4.1
R
L=470
PST574F 3.4 3.6 3.8
Detection voltage V
S
1V
OL
<
=
0.4V
PST574G 3.1 3.3 3.5
V
V
CC=H L
PST574H 2.9 3.1 3.3
PST574I 2.75 2.90 3.05
PST574J 2.55 2.70 2.85
PST574K 2.35 2.50 2.65
PST574L 2.15 2.30 2.45
Hysteresis voltage V
S 1RL=470, VCC=L H L 25 50 100 mV
Detection voltage temperature
VS/ T 1 RL=470, Ta=
-
20°C~+75°C ±0.01 %/°C
coefficient
Low-level output voltage V
OL 1
V
CC
=V
S
min.
-
0.05V, R
L
=470
0.1 0.4 V
Output leakage current I
OH 1VCC=7.5V ±0.1 µA
Circuit current while on I
CCL 1VCC=VS min.
-
0.05V, RL=∞ 400 650 µA
Circuit current while off I
CCH 1VCC=VS typ./0.85V, RL=∞ 7.5 12.0 µA
"H"transport delay time tpLH 2
*
1 RL=4.7kΩ, CL=100pF 250 400 600 µS
"L"transport delay time tpHL 2
*
1 RL=4.7kΩ, CL=100pF 6 20 µS
Operation limit voltage VopL 1 R
L=4.7kΩ, VOL
<
=
0.4V 0.65 0.85 V
Output current while on II
OL I1VCC=Vs min.
-
0.05V, RL=0 8 30 mA
Output current while on II I
OL II 1
*
2 Ta=
-
20°C~+75°C, R
L
=0
5mA
*
1 : tpLH : VCC=(VS typ.
-
0.4V) (VS typ.+0.4V), tpHL : VCC=(VS typ.+0.4V) (VS typ.-0.4V)
*
2 : VCC=VS min.
-
0.15V
Products to be discontinued