MITSUMI

System Reset PST591~595

System Reset

Monolithic IC PST591~595 Series

Outline

These 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, and has a built-in fixed delay time

generating circuit. This series has been represented in the past by PST574/PST575, but these new low reset

type system reset ICs expand the delay time series with a counter timer using an analog/digital hybrid circuit.

Features

1. Fixed delay time setting by counter timer

Excellent delay time temperature characteristics

2. Low operating limit voltage

0.65V typ.

3. Hysteresis voltage provided in detection voltage

50mV typ.

4. Current consumption for no-load

5. 5 delay time products available

PST591

50mS

PST594 400mS

PST592 100mS

PST595 800mS

PST593 200mS

6. Each product has 9 detection voltage ranks.

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.

Package

MMP-4A (PST59

M)

TO-92A (PST59

)

(MMP-4A has a manual reset pin, which should be set at GND or NC during normal operation.)

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.

6. Mechanical reset circuits