System Reset PST93XX MITSUMI 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 VS±2% max. Ultra-low current consumption ICCH=2.0µA typ. ICCL=2.0µA 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 ....... (Example: for 4.2V PST9342) 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 SC-82ABA 1 NC 2 GND 3 VOUT 4 VCC System Reset PST93XX MITSUMI Block Diagram Pin Description Pin no. Pin name 1 NC 2 GND GND pin 3 VOUT Reset signal output pin 4 VCC Power supply pin/voltage detection pin Absolute Maximum Ratings Function (Ta=25°C) Item Symbol Rating Units Storage temperature TSTG -40~+125 °C Operating temperature TOPR -20~+75 °C Power supply voltage VCC max. -0.3~10 V Allowable loss Pd 150 mW Recommended Operating Conditions Item Symbol Rating Units Operating temperature TOPR -20~+75 °C Power supply voltage VCC +0.85~+10 V System Reset PST93XX MITSUMI Electrical Characteristics Item Detection voltage 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 *1 : t *2 : t (Ta=25°C) Symbol Measurement circuit Measurement conditions Min. Typ. Max. Units 1 PST9346 PST9345 PST9344 PST9343 PST9342 PST9341 PST9340 PST9339 PST9338 PST9337 PST9336 PST9335 PST9334 VCC=H L RL=4.7kΩ PST9333 VOL <= 0.4V PST9332 PST9331 PST9330 PST9329 PST9328 PST9327 PST9326 PST9325 PST9324 PST9323 PST9322 PST9321 PST9320 PST9319 VCC=L H L, RL=4.7kΩ 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 Vs / T 1 VOL IOH ICCL ICCH TPLH TPHL VOPL IOL1 IOL2 1 1 1 1 2 2 1 1 1 VS Vs : VCC= (VS typ.-0.4v) (VS typ.+0.4v) PHL : VCC= (VS typ.+0.4v) (VS typ.-0.4v) PLH 1 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 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 RL=4.7kΩ, Ta=-20~+75°C ±0.01 %/°C VCC=Vs min.-0.05V, RL=4.7kΩ VCC=Vo=10V VCC=Vs min.-0.05V, RL=∞ VCC=Vs typ./0.85, RL=∞ RL=4.7kΩ, CL=100pF 1 RL=4.7kΩ, CL=100pF 2 RL=4.7kΩ, VOL <= 0.4V VCC=Vs min.-0.05V, Vo=0.4V VCC=Vs min.-0.05V, Ta=-20~+75°C 0.2 2.0 2.0 20 20 0.65 * * 5 3 0.4 ±0.1 4.0 4.0 60 60 0.85 V µA µA µA µS µS V mA mA System Reset PST93XX MITSUMI 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 System Reset PST93XX MITSUMI 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.=.500kΩ in the above application circuit. If this presents a problem, set the CL value slightly higher (1000pF or more recommended). * *: Varies slightly depending on V Characteristics VOUT Vs Vs VCC S rank.