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| MITSUMI IC for System Reset PST70XX IC for System Reset Monolithic IC PST70XX Series Outline May 21, 2002 This IC is a low-reset type system reset IC and in a variety of CPU systems and other logic systems, to detect supply voltage and reset the system accurately when the power is turned on or interrupted. It includes a high-precision voltage detection function with ultra-low current consumption and is ideal for voltage check circuits for products using a battery. 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 for detection voltage 50mV typ. Large output current during power-on 30mA typ. Detection voltage can be selected as desired within a range of 1.9 to 4.6V by 0.1V step, as indicated below. PST70XX Detection voltage value (Example: for 4.6V ....... PST7046) Packages MMP-3A (PST70 M) TO-92A (PST70 ) The box represents a rank of detection voltage. * 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 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 IC for 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 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 VOL IOH ICCL ICCH tPLH tPHL VOPL IOL1 IOL2 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 IC for System Reset PST70XX Measuring Circuit [1] [2] *1 *2 0V *1 VS+0.4V *2 VS-0.4V |
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