MITSMI PST993C, PST993D, PST993E, PST993F, PST993G Datasheet
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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 |
VS±5% max. |
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2. |
Low consumption current |
ICCH=300µA typ. ICCL=250µA typ. |
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3. |
Low operating threshold voltage |
0.65V typ. |
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4. |
Hysteresis voltage is provided as detect voltage |
50mV typ. |
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Large output current at the time ON |
15mA typ. |
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6. |
Detect voltage rank |
PST993 C : 4.5V |
H: 3.1V |
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D : 4.2V |
I : 2.9V |
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E : 3.9V |
J : 2.7V |
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F : 3.6V |
K : 2.5V |
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G : 3.3V |
L : 2.3V |
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(Same ranks for PST994 too) |
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7. |
Output form |
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PST993 : Constant current load built-in |
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PST994 : Open collector |
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Packages
TO-92A (PST993 
, PST994 
)
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contains detection voltage rank.
Applications
1.Reset circuits for microcomputers, CPU and MPU.
2.Reset circuit for logic circuitry.
3.Level detecting circuit.
Pin Assignment
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1 |
VCC |
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GND |
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3 |
VOUT |
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1 2 3
TO-92A
MITSUMI System Reset PST993, 994
Equivalent Circuit Diagram
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PST993 |
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PST994 |
Absolute Maximum Ratings (Ta=25°C)
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Ratings |
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Storage temperature |
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TSTG |
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-40~+125 |
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°C |
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Operating temperature |
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TOPR |
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-20~+75 |
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°C |
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Supply voltage |
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VCC |
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-0.3~10 |
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V |
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Allowable loss |
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Pd |
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300 |
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mW |
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Electrical Characteristics |
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(Ta=25°C) (The unit of resistance is Ω unless otherwise indicated.) |
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Measurement |
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Measurement conditions |
Min. |
Typ. |
Max. |
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Circuit |
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PST993C |
4.27 |
4.5 |
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4.73 |
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PST993D |
4.00 |
4.2 |
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4.40 |
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PST993E |
3.70 |
3.9 |
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4.10 |
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PST993F |
3.42 |
3.6 |
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3.78 |
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RL=∞ |
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Detection Voltage |
VS |
1 |
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PST993G |
3.13 |
3.3 |
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3.47 |
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VCC=H |
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PST993H |
2.94 |
3.1 |
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3.26 |
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PST993I |
2.75 |
2.9 |
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3.05 |
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PST993J |
2.56 |
2.7 |
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2.84 |
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PST993K |
2.37 |
2.5 |
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2.63 |
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PST993L |
2.18 |
2.3 |
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2.42 |
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Hysteresis Voltage |
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VS |
1 |
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RL=∞ , VCC=L |
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H |
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L |
30 |
50 |
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100 |
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mV |
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Detection Voltage |
VS/ |
T |
1 |
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RL=∞ , Ta=-20~+75°C |
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±0.01 |
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%/°C |
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Temperature Coefficient |
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Low Level Output Voltage |
VOL |
1 |
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VCC=Vs min. -0.05V, RL=1k |
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0.1 |
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0.4 |
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V |
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Output Constant Current |
IOC |
1 |
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VO=2.5V, VCC=5V, RL=∞ |
-40 |
-25 |
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-17 |
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µA |
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Circuit Current at ON Time |
ICCL |
1 |
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VCC=Vs min. -0.05V, RL=∞ |
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250 |
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400 |
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µA |
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Circuit Current at OFF Time |
ICCH |
1 |
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VCC=Vs typ. /0.85V, RL=∞ |
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300 |
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500 |
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µA |
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"H" Transmission Delay Time |
tpLH |
2 |
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CL=100pF |
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20 |
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µS |
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"L" Transmission Delay Time |
tpHL |
2 |
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CL=100pF |
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µS |
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Operating Threshold Voltage |
VOPL |
1 |
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0.4V |
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0.65 |
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0.85 |
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RL=4.7k, VOL = |
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Output Current at ON Time 1 |
IOL1 |
1 |
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RL=∞ , VO=0.4V |
6 |
15 |
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mA |
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VCC=VS min. -0.05V |
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Output Current at ON Time 2 |
IOL2 |
1 |
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Ta=-20~+75°C, RL=∞ |
4 |
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mA |
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VO=0.4V, VCC=Vs min. -0.05V |
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*Do not apply onto the OUT terminal any voltage higher than that at the VCC terminal. (*1) The tpLH is a function of the charging time of CL by output constant current. The delay time of this IC is about 1 µS.
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