MITSUMI

System Reset PST91XX

System Reset

Monolithic IC PST91XX Series

Outline

The function of this low reset type 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, with its super low consumption current and high precision voltage detection capacity, is most suited as a

voltage check circuit for a number of products which use batteries.

Features

1. High precision voltage detection

Vs±3% max.

2. Super low current consumption

3. Low operating threshold voltage

0.65V typ.

4. Hysteresis voltage is provided as a detect voltage

50mV typ.

5. Large output current at the time ON

15mA typ.

6. The detect voltage can be selected at your discretion at 0.1V step within the range of 1.9 to 4.6V by the

following stipulation method.

PST91XX

Detected voltage value

(Example : for 4.2V ······ PST9142)

Package

TO-92A (PST91

)

SOT-25A (PST91

N)

Applications

1. Reset circuits for microcomputers, CPU and MPU.

2. Reset circuit for logic circuitry.

3. Battery voltage check circuit.

4. Circuit for changing over to backup battery.

5. Level detecting circuit.

Pin Assignment

12

3

TO-92A

54

12

3

SOT-25A

(Note) The pin 2 of SOT-25 package is a SUB terminal. Connect it to GND.

1

2

3

GND

1

NC

2

SUB

3

GND

4

5