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| MITSUMI System Reset PST90XX System Reset Monolithic IC PST90XX Series Outline The function of this low voltage detection type IC is to accurately reset systems after detecting the supply voltage at the time of switching power on and instantaneous power off in various CPU and other logic systems. This IC, with its super low consumption current and high precision voltage detection capacity, is most suited as a voltage check circuit for a number of products which use batteries. Features 1. High precision voltage detection VS2.5% max. 2. Super low current consumption ICCH=1.5A typ. ICCL=1A typ. 3. Low operating threshold voltage 0.7V max. 4. Hysteresis voltage is provided as a detect voltage Vs 5% typ. 5. The detect voltage can be selected at your discretion at 0.1 V step within the range of 0.8 to 1.8V by the following stipulation method. PST90XX Detected voltage value (Example : for 0.8V ****** PST9008) Package TO-92A (PST90 SOT-25A (PST90 ) N) Applications 1. Reset circuits for microcomputers, CPU and MPU. 2. Reset circuit for logic circuitry. 3. Battery voltage check circuit. 4. Circuit for changing over to backup battery. 5. Level detecting circuit. Pin Assignment 1 1 2 3 1 2 3 VOUT VCC GND 1 2 3 5 4 2 3 4 5 SOT-25A (TOP VIEW) Note : The pin 2 of SOT-25 package is a SUB terminal. Connect it to GND. TO-92A NC SUB GND VOUT VCC MITSUMI System Reset PST90XX Equivalent Circuit Diagram Absolute Maximum Ratings Item Storage temperature Operating temperature Supply Voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC max. Pd Ratings -40~+125 -20~+75 -0.3~10 150 (SOT-25A) 300 (TO-92A) Units C C V mW Electrical Characteristics Item Symbol (Ta=25C) (The unit of resistance is unless otherwise indicated.) Measurement Circuit Measurement conditions PST9008 PST9009 PST9010 PST9011 PST9012 PST9013 PST9014 PST9015 PST9016 PST9017 PST9018 Min. Typ. Max. Unit Detection Voltage VS 1 RL=4.7k VCC=H L VOL < 0.4V = Hysteresis Voltage VS 1 1 1 1 1 1 2 2 1 1 1 Detection Voltage VS/ T Temperature Coefficient Low Level VOL Output Voltage Output Leakage Current IOH Circuit Current at On Time ICCL Circuit Current at ICCH OFF Time "H" Transmission Delay Time tpLH "L" Transmission Delay Time tpHL Operating Threshold Voltage VopL Output Current at IOL1 On Time 1 Output Current at IOL2 On Time 2 RL=4.7k VCC=L H L RL=4.7k Ta=-20C~+75C VCC=Vs min. -0.02V RL=4.7k VCC=10V VCC=Vs min. -0.02V IOL=0mA VCC=1.5V, RL= Vs=0.8~1.2 VCC=3.0V, RL= Vs=1.3~1.8 CL=100pF, RL=4.7k CL=100pF, RL=4.7k < RL=4.7k, VOL = 0.4V RL=0 VCC=Vs min. -0.02V VCC=Vs min. -0.02V RL=0, Ta=-20C~+75C 0.8 0.9 1.0 1.1 1.2 -2.5% +2.5% 1.3 typ. typ. 1.4 1.5 1.6 1.7 1.8 VS VS typ. VS 0.5 0.05 2 0.01 0.2 0.4 0.1 2.0 2.0 50 80 0.70 V mV %/C V A A A s s V mA mA 1.0 1.0 10 20 20 50 0.65 0.3 0.2 MITSUMI System Reset PST90XX Equivalent Circuit Characteristics VS vs. Ta 0.83 0.82 0.81 (Example: PST9008) ICCL vs. Ta 3 2.5 2 VS (V) 0.80 0.79 0.78 0.77 -20-10 0 10 20 30 40 50 60 70 ICCL 1.5 (A) 1 0.5 0 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) VS vs. Ta 70 60 50 40 30 20 10 0 VOpL vs. Ta 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 VS (mV) VopL (V) -20-10 0 10 20 30 40 50 60 70 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) ICCH vs. Ta 3 2.5 2 ICCH 1.5 (A) 1 0.5 0 -20-10 0 10 20 30 40 50 60 70 Ta (C) |
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