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| MITSUMI System Reset PST91XX System Reset Monolithic IC PST91XX Series Outline The function of this low reset 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. Further, 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 Vs3% max. 2. Super low current consumption ICCH=1.5A typ. ICCL=1.0A typ. 3. Low operating threshold voltage 0.65V typ. 4. Hysteresis voltage is provided as a detect voltage 50mV typ. 5. Large output current at the time ON 15mA typ. 6. The detect voltage can be selected at your discretion at 0.1V step within the range of 1.9 to 4.6V by the following stipulation method. PST91XX Detected voltage value (Example : for 4.2V ****** PST9142) Package TO-92A (PST91 SOT-25A (PST91 ) 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 5 1 2 3 1 2 3 VOUT VCC GND 1 2 4 1 2 NC SUB GND VOUT VCC 3 3 4 5 SOT-25A TO-92A (Note) The pin 2 of SOT-25 package is a SUB terminal. Connect it to GND. MITSUMI System Reset PST91XX Equivalent Circuit Diagram Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC Pd Ratings -40~+125 -20~+75 -0.3~10 150 (SOT-25A) 300 (TO-92A) Units C C V mV Electrical Characteristics Item (Ta=25C) (The unit of resistance is unless otherwise indicated.) Measurement Circuit Symbol Measurement conditions Min. Typ. Max. Units 4.6~ Detection Voltage VS 1 RL=4.7k, VOL < 0.4V = VCC=H L RL=470, VCC=L HL -3% typ. 30 1.9 (0.1V step) 50 0.01 0.2 1.0 1.5 20 20 0.65 +3% typ. 100 V Hysteresis Voltage Detection Voltage Temperature Coefficient Low Level Output Voltage Output Leakage Current Circuit Current at ON Time Circuit Current at OFF Time "H" Transmission Delay Time "L" Transmission Delay Time Operating Threshold Voltage Output Current at ON Time 1 Output Current at ON Time 2 VS VS/ T VOL IOH ICCL ICCH tpLH tpHL VOPL IOL1 IOL2 1 1 1 1 1 1 2 2 1 1 1 mV %/C RL=470, Ta=-20~+75C VCC=VS min.-0.05V, RL=470 VCC=10V VCC=VS min.-0.05V, RL= VCC=VS typ./0.85V, RL= CL=100pF, RL=4.7k CL=100pF, RL=4.7k RL=4.7k, VOL < 0.4V = RL=0, VCC=VS min.-0.05V Ta=-20~+75C RL=0, VCC=VS min.-0.05V 5 3 0.4 0.1 2.0 2.5 60 60 0.85 V A A A S S V mA mA MITSUMI System Reset PST91XX Application Circuits Characteristics VS vs. Ta 4.65 4.60 4.55 (Example: PST9145) IOL vs. Ta 40 35 VS (mV) 4.50 4.45 4.40 4.35 -20-10 0 10 20 30 40 50 60 70 IOL 30 (mA) 25 20 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) ICCH vs. Ta 3 2.5 2 VS vs. Ta 100 90 80 70 60 VS 50 (mV) 40 30 20 10 0 ICCH (A) 1.5 1 0.5 0 -20-10 0 10 20 30 40 50 60 70 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) VOpL vs. Ta 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 VOL vs. Ta 240 220 200 180 160 140 120 100 80 60 VopL (V) VOL (mV) -20-10 0 10 20 30 40 50 60 70 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) |
Price & Availability of PST9139
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