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| MITSUMI System Reset PST92XX System Reset Monolithic IC PST92XX Series Outline This reset IC in an ultra-compact package provides highly accurate detection and includes a delay circuit. Features 1. Delay circuit 2. High detection accuracy 3. Low consumption current delay time can be set through an external capacitor. Vs1.5%. 3A typ. Package SOT-25 Applications Microcomputer reset and detection of remaining battery charge. Pin Assignment 1 5 4 2 3 1 2 3 4 5 SOT-25 TC SUB GND VOUT VCC Equivalent Circuit Diagram MITSUMI System Reset PST92XX Pin Description Pin No. Pin name 1 TC 2 SUB 3 GND 4 VOUT 5 VCC Note 1 : Connect to GND. Functions TPLH control pin Substrate pin*1 GND pin Reset signal output pin VCC pin/voltage detect pin Absolute Maximum Ratings Item Storage temperature Operating temperature Supply voltage Allowable loss Symbol TSTG TOPR VCC max. Pd Ratings -40~+125 -20~+175 -0.3~+110 150 Unit C C V mW Recommended Operating Conditions Item Operating temperature Supply voltage Symbol TOPR VCC Ratings -20~+75 -0.3~+10 Unit C V Electrical Characteristics Item Symbol (Except where noted otherwise, Ta=25C) Measurement circuit Measurement conditions PST9246 PST9245 PST9244 PST9243 PST9242 PST9241 PST9240 PST9239 PST9238 PST9237 PST9236 PST9235 PST9234 PST9233 PST9232 PST9231 PST9230 PST9229 PST9228 PST9227 PST9226 PST9225 PST9224 PST9223 PST9222 PST9221 PST9220 PST9219 Min. 4.531 4.432 4.334 4.235 4.137 4.038 3.940 3.841 3.743 3.644 3.546 3.447 3.349 3.250 3.152 3.053 2.955 2.856 2.758 2.659 2.561 2.462 2.364 2.265 2.167 2.068 1.970 1.871 Typ. 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 Max. 4.669 4.568 4.466 4.365 4.263 4.162 4.060 3.959 3.857 3.756 3.654 3.553 3.451 3.350 3.248 3.147 3.045 2.944 2.842 2.741 2.639 2.538 2.436 2.335 2.233 2.132 2.030 1.929 Unit Detecting voltage VS 1 VCC=H L RL=4.7k VOL < 0.4V = V MITSUMI System Reset PST92XX Item Hysteresis voltage Symbol Vs Measurement circuit 1 1 1 1 1 1 2 2 1 1 1 Measurement conditions H L, RL=4.7k S1 : ON RL=4.7k, Ta=-20~+75C S1 : ON VCC1=VSmin. -0.05V RL=4.7k S1 : ON VCC1=VCC2=10V S2 : ON VCC1=VSmin. -0.05V RL= VCC1=VStyp./0.85 RL= RL=4.7k, CL=100pF Cd=0.01F *1 RL=4.7k, CL=100pF Cd=0.01F *2 < RL=4.7k VOL = 0.4V S1 : ON VCC1=VSmin. -0.05V VCC2=0.4V S2 : ON VCC1=VSmin. -0.05V Ta=-20~+75C S2 : ON VCC=L Min. 25 Typ. 50 0.01 0.1 5.0 3.0 (*3) (*3) 0.65 Max. 100 Unit mV %/C Detecting voltage Vs/ T temperature coefficient Low level output voltage Output Leak current Circuit current at ON time Circuit current at OFF time "H" transmission delay time "L" transmission delay time Threshold operating voltage Output current at ON time 1 Output current at ON time 2 VOL IOH ICCL ICCH TPLH TPHL VOPL IOL1 IOL2 0.4 0.1 9.0 5.0 V A A A mS S 0.85 V mA mA 5 3 NOTE 1: TPLH : VCC=(VS typ. -0.4V) (VS typ. +0.4V) NOTE 2 : TPLH : VCC=(VS typ. +0.4V) (VS typ. -0.4V) NOTE 3 : Tables of PST92 series transmission delay time TPLH 195 190 185 180 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 95 90 85 80 75 70 65 60 TPHL 140 140 140 140 140 140 140 140 120 120 120 120 120 120 120 120 120 120 100 100 100 100 100 100 100 100 100 100 PST9246 PST9245 PST9244 PST9243 PST9242 PST9241 PST9240 PST9239 PST9238 PST9237 PST9236 PST9235 PST9234 PST9233 PST9232 PST9231 PST9230 PST9229 PST9228 PST9227 PST9226 PST9225 PST9224 PST9223 PST9222 PST9221 PST9220 PST9219 MITSUMI System Reset PST92XX Measuring Circuit (1) (2) A : DC Amperemeter V : DC Voltmeter CRT : Oscilloscope INPUT PULSE Vs typ.+0.4V Vs typ.-0.4V 0V MITSUMI System Reset PST92XX Timing Chart V Vs VCC Vs >TPLH V VOUT TPLH TPLH TPLH Application Circuit If the impedance of VCC line is high enough, connect a capacitor between VCC and GND terminal of the IC. (NOTE 1) NOTE 1 : When the rapid noise occurs to VCC, VOUT has sometimes switched over even if VCC doesn't become below VS. MITSUMI System Reset PST92XX Characteristics (1) VCC vs VOUT VOUT Vs Vs VCC (2) Cd-TPLH Representative TPLH Data : PST9220, PST9244 PST9220 Cd-TPLH Characteristics 1.0E+00 1.0E-01 1.0E-02 1.0E-03 1.0E-04 1.0E-05 1.0E+00 PST9244 Cd-TPLH Characteristics 1.0E+00 1.0E-01 1.0E-02 1.0E-03 1.0E-04 1.0E-05 1.0E+00 TPLH (S) 1.0E+01 1.0E+02 1.0E+03 1.0E+04 TPLH (S) 1.0E+01 1.0E+02 1.0E+03 1.0E+04 Cd (pF) Cd (pF) "H" transmission delay time can be calculated roughly using the following formula, but there is some fluctuation due to element deviation and the Vcc input signal (dV/dT). TPLH [ms] . . Cd [F] d = d: delay time coefficient Model name PST9246 PST9245 PST9244 PST9243 PST9242 PST9241 PST9240 PST9239 PST9238 PST9237 d 1.95 104 1.90 104 1.85 104 1.80 104 1.75 104 1.70 104 1.65 104 1.60 104 1.55 104 1.50 104 Model name PST9236 PST9235 PST9234 PST9233 PST9232 PST9231 PST9230 PST9229 PST9228 PST9227 d 1.45 1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 104 104 104 104 104 104 104 104 104 104 Model name PST9226 PST9225 PST9224 PST9223 PST9222 PST9221 PST9220 PST9219 d 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 104 104 104 104 104 104 104 104 |
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