System Reset PST90XX MITSUMI 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 VS±2.5% max. 2. Super low current consumption ICCH=1.5µA typ. ICCL=1µA 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 2 1 VOUT 2 VCC 3 GND 5 1 4 2 3 3 SOT-25A (TOP VIEW) Note : The pin 2 of SOT-25 package is a SUB terminal. Connect it to GND. TO-92A 1 NC 2 SUB 3 GND 4 VOUT 5 VCC System Reset PST90XX MITSUMI Equivalent Circuit Diagram Absolute Maximum Ratings (Ta=25°C) Item Storage temperature Operating temperature Supply Voltage Symbol TSTG TOPR VCC max. Allowable loss Pd Electrical Characteristics Item Detection Voltage Hysteresis Voltage Symbol VS VS 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 Ratings -40~+125 -20~+75 -0.3~10 150 (SOT-25A) 300 (TO-92A) Units °C °C V mW (Ta=25°C) (The unit of resistance is Ω unless otherwise indicated.) Measurement Circuit 1 1 1 1 1 1 1 2 2 1 1 1 Measurement conditions RL=4.7k VCC=H L VOL <= 0.4V PST9008 PST9009 PST9010 PST9011 PST9012 PST9013 PST9014 PST9015 PST9016 PST9017 PST9018 RL=4.7k VCC=L H L RL=4.7k Ta=-20°C~+75°C VCC=Vs min. -0.02V RL=4.7k VCC=10V VCC=Vs min. -0.02V IOL=0mA Vs=0.8~1.2 VCC=1.5V, RL=∞ 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=-20°C~+75°C Min. Typ. Max. 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 V mV %/°C ±0.01 10 20 Unit 0.2 0.4 V 1.0 0.1 2.0 µA µA 1.0 2.0 µA 20 50 0.65 50 80 0.70 µs µs V 0.3 mA 0.2 mA System Reset PST90XX MITSUMI Equivalent Circuit Characteristics (Example: PST9008) VS vs. Ta VS (V) ICCL vs. Ta 0.83 3 0.82 2.5 0.81 2 0.80 ICCL 1.5 (µA) 0.79 1 0.78 0.77 0.5 Ta VS (mV) Ta (°C) VOpL vs. Ta VopL (V) -20-10 0 10 20 30 40 50 60 70 Ta (°C) ICCH vs. Ta 3 2.5 2 ICCH 1.5 (µA) 1 0.5 0 -20-10 0 10 20 30 40 50 60 70 (°C) VS vs. Ta 70 60 50 40 30 20 10 0 0 -20-10 0 10 20 30 40 50 60 70 -20-10 0 10 20 30 40 50 60 70 Ta (°C) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -20-10 0 10 20 30 40 50 60 70 Ta (°C)