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| MITSUMI System Reset PST574 System Reset Monolithic IC PST574 Outline This IC functions 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. This ultra-low current consumption low reset type system reset IC has a built-in fixed delay time generating circuit. It is ideal for use in multi-CPU systems because a fast-rising output waveform can be obtained. Features 1. 2. 3. 4. 5. Ultra-low current consumption Low operating limit voltage Output current high for ON Hysteresis voltage provided in detection voltage Built-in delay circuit with excellent delay time temperature characteristics 6. 10 ranks of detection voltage ICCH=7.5A typ. ICCL=400A typ. 0.65V typ. 30mA typ. 50mV typ. 50mV typ. PST574 C : 4.5V typ. D : 4.2V typ. E : 3.9V typ. F : 3.6V typ. G : 3.3V typ. H : 3.1V typ. I : 2.9V typ. J : 2.7V typ. K : 2.5V typ. L : 2.3V typ. Package MMP-3A (PST574 M) TO-92A (PST574 ) contains detection voltage rank . * Applications 1. 2. 3. 4. 5. Reset circuits in microcomputers, CPUs and MPUs (especially multi-CPU sets) 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 MMP-3A TO-92A MITSUMI System Reset PST574 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 ) Measurement Measurement conditions circuit PST574C PST574D PST574E PST574F RL=470 PST574G 1 VOL < 0.4V = PST574H VCC=H L PST574I PST574J PST574K PST574L 1 RL=470, VCC=L H L 1 1 1 1 1 2 2 1 1 1 RL=470, Ta=-20C~+75C VCC=VS min.-0.05V, RL=470 VCC=7.5V VCC=VS min.-0.05V, RL= VCC=VS typ./0.85V, RL= 1 RL=4.7k, CL=100pF 1 RL=4.7k, CL=100pF < RL=4.7k, VOL = 0.4V VCC=Vs min.-0.05V, RL=0 2 Ta=-20C~+75C, RL=0 Min. Typ. Max. Units 4.3 4.0 3.7 3.4 3.1 2.9 2.75 2.55 2.35 2.15 25 4.5 4.2 3.9 3.6 3.3 3.1 2.90 2.70 2.50 2.30 50 0.01 0.1 400 7.5 400 6 0.65 30 0.4 0.1 650 12.0 600 20 0.85 4.7 4.4 4.1 3.8 3.5 3.3 3.05 2.85 2.65 2.45 100 Symbol Detection voltage VS V Hysteresis voltage Detection voltage temperature coefficient Low-level output voltage Output leakage current Circuit current while on Circuit current while off "H"transport delay time "L"transport delay time Operation limit voltage Output current while on I Output current while on II VS VS/ T VOL IOH ICCL ICCH tpLH tpHL VopL IOL I IOL II mV %/C V A A A S S V mA mA * * * 250 8 5 * * 1 : tpLH : VCC=(VS typ.-0.4V) 2 : VCC=VS min.-0.15V (VS typ.+0.4V), tpHL : VCC=(VS typ.+0.4V) (VS typ.-0.4V) MITSUMI System Reset PST574 Measuring Circuit [1] [2] 0.8V 4.9 VS 4.1 0V Note: Input model is an example for PST574C. Characteristics Vcc vs. VOUT 8 7 6 (Example: PST574C) Vcc vs. Icc 500 400 300 Ta=75C Ta=-20C Ta=25C VOUT (V) 4 3 2 1 0 1 Ta=-25C Ta=25C Ta=75C 5 ICC (A) 200 100 0 0 1 2 3 4 5 6 7 8 2 3 4 5 6 7 8 VCC (V) VCC (V) Vs vs. Ta 4.53 4.52 4.51 Vs vs. Ta 80 70 60 VS 4.50 (V) 4.49 4.48 4.47 -40 -20 0 20 40 60 80 VS 50 (mV) 40 30 20 -40 -20 0 20 40 60 80 Ta (C) Ta (C) MITSUMI System Reset PST574 IoL vs. Ta 60 50 VoL vs. Ta 300 250 IOL 40 (mA) 30 20 10 -40 -20 0 20 40 60 80 VOL 200 (mV) 150 100 50 -40 -20 0 20 40 60 80 Ta (C) Ta (C) ICCH vs. Ta 10 9 8 ICCL vs. Ta 500 lCCH (A) 7 6 5 4 -40 -20 0 20 40 60 80 ICCL 400 (A) 300 -40 -20 0 20 40 60 80 Ta (C) Ta (C) tPLH vs. Ta 600 500 450 Pd vs. Ta 300 tPLH (S) 200 400 350 300 250 -40 -20 0 20 40 60 80 Pd (mW) 100 0 0 25 50 75 100 125 Ta (C) Ta (C) Timing Chart 7 6 5 4 VCC /VOUT 3 (V) 2 1 0 VCC VS VOUT Time RESET ON OFF Undefined MITSUMI System Reset PST574 Application circuits 1. Normal hard reset Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 2. Battery checker (LED ON for high voltage) Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 3. Battery checker (LED ON for low voltage) Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 4. Hysteresis voltage UP method When increasing hysteresis voltage for stable system operation, determine RH as follows and connect externally. However, ICCH is -5000PPM/C, so perform temperature compensation at RH when using over a wide temperature range. Hysteresis voltage UP amount ( Vsup) is Vsup . . RH ICCL = Total hysteresis voltage ( Vstotal) is Vstotal . . Vs + Vsup = (Operation will be destabilized if RH is raised too much.) Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. |
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