System Reset PST91XX
MITSUMI
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 maꢀ.
2. Super low current consumption
ICCH=1.5µA typ. ICCL=1.0µA typ.
0.65V typ.
±. Low operating threshold voltage
4. Hysteresis voltage is provided as a detect voltage
5. Large output current at the time ON
50mV typ.
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
(Eꢀample : 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.
±. Battery voltage check circuit.
4. Circuit for changing over to backup battery.
5. Level detecting circuit.
Pin Assignment
1
2
3
4
5
NC
SUB
GND
VOUT
VCC
5
1
4
3
1
2
3
VOUT
VCC
2
GND
1
2
3
-
SOT 25A
-
TO 92A
(Note) The pin 2 of SOT-25 package is a SUB terminal. Connect it to GND.