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| MITSUMI System Reset PST596~598 System Reset Monolithic IC PST596~598 Series Outline These 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, and has a built-in fixed delay time generating circuit. This series has been represented in the past by PST591~595, and these new system reset ICs offer ultra-small size and low current consumption. Features 1. Fixed delay time setting by counter timer 2. Low operating limit voltage 3. Hysteresis voltage provided in detection voltage 4. Low current consumption 5. 3 delay time products available 0.65V typ. 50mV typ. ICCH=15A typ. PST596 50mS PST597 100mS PST598 200mS C : 4.5V typ. H : 3.1V typ. D : 4.2V typ. I : 2.9V typ. E : 3.9V typ. J : 2.7V typ. F : 3.6V typ. K : 2.5V typ. G : 3.3V typ. L : 2.3V typ. 6. Each product has 10 detection voltage ranks. Package SOT-25A (PST59 N) (with manual reset pin) contains detection voltage rank. * Applications 1. Reset circuits in microcomputers, CPUs and MPUs 2. Logic circuit reset circuits. 3. Battery voltage check circuits. 4. Back-up power supply switching circuits. 5. Level detection circuits. 6. Mechanical reset circuits MITSUMI System Reset PST596~598 Equivalent Circuit Diagram Pin Assignment 1 5 4 2 3 4 1 2 3 5 M/R SUB GND VOUT VCC SOT-25 Pin Description Pin No. 1 2 3 4 5 Pin name M/R SUB GND VOUT VCC Manual reset pin SUB pin Function *1 *2 GND pin Reset signal output pin Power supply pin/Voltage detection pin *1: Note that the oscilloscope may mis-operate if the M/R pin falls below -0.3V. *2: Connect to GND. Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage Manual reset input voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC max. VRES max. Pd Rating -40~+125 -20~+75 -0.3~+12 -0.3~+12 150 Units C C V V mW MITSUMI System Reset PST596~598 Recommended Operating Conditions Item Operating temperature Power supply voltage Symbol TOPR VCC Rating -20~+75 -0.3~+12 Units C V Electrical Characteristics Item (Ta=25C) Measurement conditions C D E VCC=H L F G H I J K L Vs 1 1 1 1 1 1 2 2 1 1 1 VCC=L H L, RL=470 Min. Typ. Max. Units 4.3 4.0 3.7 3.4 3.1 2.9 4.5 4.2 3.9 3.6 3.3 3.1 4.7 4.4 4.1 3.8 3.5 3.3 V Symbol Measuring circuit Detection voltage Vs 1 RL=470 VOL < 0.4V = 2.75 2.90 3.05 2.55 2.70 2.85 2.35 2.50 2.65 2.15 2.30 2.45 30 50 0.01 0.1 300 15 30 60 120 50 100 200 20 0.65 0.85 8 6 2.0 0.4 0.1 500 25 75 150 300 S V mA mA V 10 -0.3 60 0.8 A V mS 100 mV %/C V A A A Hysteresis voltage Detection voltage temperature coefficient Low-level output voltage Output leakage current Circuit current while on Circuit current while off Vs/ T VOL IOH ICCL ICCH TPLH TPHL VOPL IOL1 IOL2 VRESH IRESH VRESL RL=470, Ta=-20C~+75C VCC=Vs min. -0.05V, RL=470 VCC=10V VCC=Vs min. -0.05V, RL= VCC=Vs typ./0.85V, RL= RL=4.7k PST596 PST597 PST598 CL=100pF "H" transport delay time *1 "L" transport delay time Operating power supply voltage Output current while on 1 Output current while on 2 M/R pin input H voltage M/R pin input H current M/R pin input low voltage RL=4.7k, CL=100pF, RL=4.7k, VOL < 0.4V = *2 VCC=Vs min. -0.05V, RL=0 VCC=Vs min. -0.05V, RL=0 Ta=-20~+75C VRESH=2.0V *1 : *2 : TPLH ; VCC= (Vs typ.-0.4V) (Vs typ.+0.4V) TPLH ; VCC= (Vs typ.+0.4V) (Vs typ.-0.4V) Note 3: Connect manual reset pin to GND when not using. MITSUMI System Reset PST596~598 Measuring Circuit [1] [2] INPUT PULSE VS typ VS typ +0.4V -0.4V 0V Timing Chart V VS VCC VS V VOUT TPLH TPLH TPLH V VRES M/R Time MITSUMI System Reset PST596~598 Application circuits 1. Normal hard reset Note: Connect a capacitor between IC VCC and GND pins if VCC line impedance is high. 2. Manual reset VOUT pin low for manual switch ON. VOUT pin high for manual switch OFF. : Mount a clamp diode if it is possible that the M/R pin might go below -0.3V. * Characteristics VCC VS VOUT VOUT VS VS VCC |
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