MITSUMI

System Reset PST993, 994

System Reset

Monolithic IC PST993, 994

Outline

The function of this IC is to accurately reset systems after detecting the supply voltage at the time of

switching power on and instantaneous power off in various CPU and other logic systems. Further, this IC can

be offered at low cost because it is designed to be simplified allowing for the replacement from reset circuit of

discrete configuration.

Features

1. Voltage detect precision

2. Low consumption current

3. Low operating threshold voltage

0.65V typ.

4. Hysteresis voltage is provided as detect voltage

50mV typ.

5. Large output current at the time ON

15mA typ.

6. Detect voltage rank

PST993 C : 4.5V

H : 3.1V

D : 4.2V

I : 2.9V

E : 3.9V

J : 2.7V

F : 3.6V

K : 2.5V

G : 3.3V

L : 2.3V

(Same ranks for PST994 too)

7. Output form

PST993 : Constant current load built-in

PST994 : Open collector

Packages

TO-92A (PST993

, PST994

)

Applications

1. Reset circuits for microcomputers, CPU and MPU.

2. Reset circuit for logic circuitry.

3. Level detecting circuit.

Pin Assignment

12

3

TO-92A

1

2

GND

3