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PDF PST574 Data sheet ( Hoja de datos )
| Número de pieza | PST574 | |
| Descripción | System Reset | |
| Fabricantes | MITSUMI ELECTRIC | |
| Logotipo |  |
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MITSUMI
System Reset
Monolithic IC PST574
System Reset 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
1. Ultra-low current consumption
2. Low operating limit voltage
3. Output current high for ON
4. Hysteresis voltage provided in detection voltage
5. Built-in delay circuit with excellent delay time
temperature characteristics
6. 10 ranks of detection voltage
ICCH=7.5µA typ. ICCL=400µA typ.
0.65V typ.
30mA typ.
50mV typ.
50mV typ.
PST574
C : 4.5V typ.
D : 4.2V typ.
E : 3.9V typ.
F : 3.6V typ.
G : 3.3V typ.
H : 3.1V typ.
I : 2.9V typ.
J : 2.7V typ.
K : 2.5V typ.
L : 2.3V typ.
Package
MMP-3A (PST574 M)
TO-92A (PST574 )
* contains detection voltage rank .
Applications
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.
Pin Assignment
123
TO-92A
1 VCC
2 GND
3 VOUT
13
2
MMP-3A
1 VCC
2 GND
3 VOUT
1 page  
MITSUMI
Application circuits
1. Normal hard reset
System Reset PST574
Note: Connect a capacitor between IC pins 1 and 2
if VCC line impedance is high.
2. Battery checker (LED ON for high voltage)
Note: Connect a capacitor between IC pins 1 and 2
if VCC line impedance is high.
3. Battery checker (LED ON for low voltage)
Note: Connect a capacitor between IC pins 1 and 2
if VCC line impedance is high.
4. Hysteresis voltage UP method
When increasing hysteresis voltage for stable system
operation, determine RH as follows and connect
externally.
However, ICCH is -5000PPM/°C, so perform
temperature compensation at RH when using over a
wide temperature range.
Hysteresis voltage UP amount ( Vsup) is
Vsup .=. RH ICCL
Total hysteresis voltage ( Vstotal) is
Vstotal .=. Vs + Vsup
(Operation will be destabilized if RH is raised too
much.)
Note: Connect a capacitor between IC pins 1 and 2 if
VCC line impedance is high.
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet PST574.PDF ] | |
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