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 MITSUMI
System Reset PST70XX
System Reset
Monolithic IC PST70XX Series
Outline
These low reset type ICs function in a variety of CPU systems and other logic systems, to detect power supply voltage and reset the system accurately when power is turned on or interrupted. They are ideal for use in battery check circuits for products using batteries, as they have ultra-low current consumption and a high precision voltage detection function.
Features
1. 2. 3. 4. 5. 6. High precision voltage detection Vs2% max. Ultra-low current consumption ICCH=2A typ. ICCL=3A typ. Low operating limit voltage 0.65V typ. Hysteresis voltage provided in detection voltage 50mV typ. Output current high for ON 30mA typ. Detection voltage can be selected as desired within a range of 1.9V~4.6V in 0.1V steps, as indicated below. PST70XX Detection voltage value (Example: for 4.6V ....... PST7046)
Package
MMP-3A (PST70 TO-92A (PST70 M) )
Applications
1. 2. 3. 4. 5. Reset circuits in microcomputers, CPUs and MPUs. Logic circuit reset circuits. Battery voltage check circuits. Back-up power supply switching circuits. Level detection circuits.
Pin Assignment
1 2 3
VCC GND VOUT
1
3
1 2
VCC GND VOUT
2
3
1
2
3
TO-92A
MMP-3A (TOP VIEW)
MITSUMI
System Reset PST70XX
Equivalent Circuit Diagram
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Allowable loss
(Ta=25C) Symbol TSTG TOPR VCC max. Pd Rating -40~+125 -20~+75 -0.3~+10 200 (MMP-3A) 300 (TO-92A) Units
C C
V mW
Electrical Characteristics
Item
(Ta=25C) (Except where noted otherwise, resistance unit is )
Symbol Measurement conditions Measurement circuit Min. Typ. Max. Units 4.6~ VS typ. 1.9 VS typ. -2% (0.1V +2% Step) 30 50 0.01 0.2 0.4 0.1 3.0 2.0 5 10 30 70 0.65 8 5 30 6.0 4.0 30 30 70 150 0.85 100
Detection voltage
VS
RL=470 VCC=H L
1
V
Hysteresis voltage Detection voltage temperature coefficient Low-level output voltage Output leakage current Circuit current while on
VS VS/ T VOL IOH ICCL ICCH tPLH tPHL VOPL IOL1 IOL2
RL=470 VCC=L
H
L
1 1 1 1 1 1 2 2 2 2 1 1 1
mV %/C V A A A s s V mA mA
RL=470 Ta=-20~+75C VCC=VS min. -0.05V RL=470 VCC=10.0V VCC=VS min. -0.05V RL= VCC=VS typ. /0.85V RL= RL=4.7k CL=100pF RL=4.7k CL=100pF 7046~24 7023~19 7046~24 7023~19
Circuit current while off
"H"transport delay time
"L"transport delay time Operation limit voltage Output current while on 1
RL=4.7k VOL < 0.4V = VCC=VS min. -0.05V RL=0 VCC=Vs min. -0.05V RL=0 Ta=-20C~+75C
Output current while on 2
MITSUMI
System Reset PST70XX
Measuring Circuit
[1] [2]
*1 *2
0V
*1
VS+0.4V
*2
VS-0.4V


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