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| MITSUMI System Reset PST93XX System Reset Monolithic IC PST93XX 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=2.0A typ. ICCL=2.0A typ. Low operating limit voltage 0.65V typ. Hysteresis voltage provided in detection voltage 50mV typ. Output current high for ON 5mA min. Detection voltage can be selected as desired within a range of 1.9V ~ 4.6V in 0.1V steps, as indicated below. PST93XX detection voltage value ....... PST9342) (Example: for 4.2V Package SC-82ABA (PST93 U) 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 4 3 1 2 3 NC GND VOUT VCC 1 2 4 SC-82ABA MITSUMI System Reset PST93XX Block Diagram Pin Description Pin no. 1 2 3 4 Pin name NC GND VOUT VCC GND pin Reset signal output pin Power supply pin/voltage detection pin Function 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 -0.3~10 150 Units C C V mW Recommended Operating Conditions Item Operating temperature Power supply voltage Symbol TOPR VCC Rating -20~+75 +0.85~+10 Units C V MITSUMI System Reset PST93XX Electrical Characteristics Item (Ta=25C) Measurement circuit Measurement conditions PST9346 PST9345 PST9344 PST9343 PST9342 PST9341 PST9340 PST9339 PST9338 PST9337 PST9336 PST9335 PST9334 VCC=H L RL=4.7k PST9333 VOL < 0.4V PST9332 = PST9331 PST9330 PST9329 PST9328 PST9327 PST9326 PST9325 PST9324 PST9323 PST9322 PST9321 PST9320 PST9319 VCC=L H L, RL=4.7k RL=4.7k, Ta=-20~+75C VCC=Vs min.-0.05V, RL=4.7k VCC=Vo=10V VCC=Vs min.-0.05V, RL= VCC=Vs typ./0.85, RL= RL=4.7k, CL=100pF 1 RL=4.7k, CL=100pF 2 RL=4.7k, VOL < 0.4V = VCC=Vs min.-0.05V, Vo=0.4V VCC=Vs min.-0.05V, Ta=-20~+75C Min. Typ. Max. Units 4.508 4.410 4.312 4.214 4.116 4.018 3.920 3.822 3.724 3.626 3.528 3.430 3.332 3.234 3.136 3.038 2.940 2.842 2.744 2.646 2.548 2.450 2.352 2.254 2.156 2.058 1.960 1.862 30 4.600 4.500 4.400 4.300 4.200 4.100 4.000 3.900 3.800 3.700 3.600 3.500 3.400 3.300 3.200 3.100 3.000 2.900 2.800 2.700 2.600 2.500 2.400 2.300 2.200 2.100 2.000 1.900 50 0.01 0.2 2.0 2.0 20 20 0.65 5 3 0.4 0.1 4.0 4.0 60 60 0.85 4.692 4.590 4.488 4.386 4.284 4.182 4.080 3.978 3.876 3.774 3.672 3.570 3.468 3.366 V 3.264 3.162 3.060 2.958 2.856 2.754 2.652 2.550 2.448 2.346 2.244 2.142 2.040 1.938 100 mV %/C V A A A S S V mA mA Symbol Detection voltage VS 1 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 1 Output current while on 2 Vs Vs / T VOL IOH ICCL ICCH TPLH TPHL VOPL IOL1 IOL2 (VS typ.+0.4v) (VS typ.-0.4v) 1 1 1 1 1 1 2 2 1 1 1 * * *1 : tPLH : VCC= (VS typ.-0.4v) *2 : tPHL : VCC= (VS typ.+0.4v) MITSUMI System Reset PST93XX Measuring Circuit (1) S1=ON, S2=OFF : when measuring IOH, IOL1, IOL2 S1=OFF, S2=ON : for measuring other than the above (2) A : DC ammeter V : DC voltmeter CRT : Oscilloscope INPUT PULSE Vs typ.+0.4V Vs typ.-0.4V 0V MITSUMI System Reset PST93XX Application circuits [CL setting] Several tens of mV of oscillation may appear in VOUT when VCC is near operating limit (approx. 0.7V)~1.0V, if RL is set at more than RL. .500k in the above application = circuit. If this presents a problem, set the CL value slightly higher (1000pF or more recommended). * *: Varies slightly depending on VS rank. Characteristics VOUT Vs Vs VCC |
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