IC for System Reset PST91XX
MITSUMI
IC for System Reset
Monolithic IC PST91XX Series
April 25, 2002
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
ICCH=1.5µA typ. ICCL=1.0µA typ.
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)
Packages
TO-92A (PST91
SOT-25A (PST91
)
N)
Applications
1.
2.
3.
4.
5.
Reset circuits for microcomputers, CPUs and MPUs
Reset circuits for logic circuits
Battery voltage check circuits
Back-up power supply switching circuits
Level detection circuits
Pin Assignment
2
3
1
2
3
TO-92A
VCC
GND
1
2
3
SOT-25A
(TOP VIEW)
(Note) The pin 2 of SOT-25 package is a SUB terminal. Connect it to GND.
SUB
3
GND
4
VOUT
NC
VOUT
5
1
4
1
2
5
VCC
