System Reset PST92XX MITSUMI 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. Vs±1.5%. 3µA typ. Package SOT-25 Applications Microcomputer reset and detection of remaining battery charge. Pin Assignment 5 1 4 2 SOT-25 Equivalent Circuit Diagram 3 1 TC 2 SUB 3 GND 4 VOUT 5 VCC System Reset PST92XX MITSUMI 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 Ratings -20~+75 -0.3~+10 Unit °C V Recommended Operating Conditions Item Operating temperature Supply voltage Electrical Characteristics Item Detecting voltage Symbol VS Symbol TOPR VCC (Except where noted otherwise, Ta=25°C) Measurement circuit 1 Measurement conditions VCC=H L RL=4.7kΩ VOL <= 0.4V 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. Typ. Max. 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 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 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 V System Reset PST92XX MITSUMI Item Hysteresis voltage Symbol Vs Measurement circuit 1 Detecting voltage Vs/ T temperature coefficient 1 Low level output voltage VOL 1 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 IOH ICCL ICCH 1 1 1 TPLH 2 TPHL 2 VOPL 1 IOL1 1 IOL2 1 Measurement conditions VCC=L H L, RL=4.7kΩ S1 : ON RL=4.7kΩ, Ta=-20~+75°C S1 : ON VCC1=VSmin. -0.05V RL=4.7kΩ S1 : ON VCC1=VCC2=10V S2 : ON VCC1=VSmin. -0.05V RL=∞ VCC1=VStyp./0.85 RL=∞ RL=4.7kΩ, CL=100pF Cd=0.01µF *1 RL=4.7kΩ, CL=100pF Cd=0.01µF *2 RL=4.7kΩ VOL =< 0.4V S1 : ON VCC1=VSmin. -0.05V VCC2=0.4V S2 : ON VCC1=VSmin. -0.05V Ta=-20~+75°C S2 : ON 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 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 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 Min. Typ. Max. Unit 25 50 100 mV ±0.01 %/°C 0.1 0.4 V 5.0 3.0 ±0.1 9.0 5.0 µA µA µA (*3) mS (*3) µS 0.65 0.85 V 5 mA 3 mA System Reset PST92XX MITSUMI Measuring Circuit (1) (2) A : DC Amperemeter V : DC Voltmeter CRT : Oscilloscope INPUT PULSE Vs typ.+0.4V Vs typ.-0.4V 0V System Reset PST92XX MITSUMI 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. System Reset PST92XX MITSUMI Characteristics (1) VCC vs VOUT VOUT Vs Vs VCC (2) Cd-TPLH Representative TPLH Data : PST9220, PST9244 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 TPLH (S) TPLH (S) PST9220 Cd-TPLH Characteristics 1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+00 1.0E-01 1.0E-02 1.0E-03 1.0E-04 1.0E-05 1.0E+00 Cd (pF) 1.0E+01 1.0E+02 1.0E+03 1.0E+04 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 [µF] d d: delay time coefficient Model name d Model name d Model name d PST9246 1.95 104 PST9236 1.45 104 PST9226 0.95 104 PST9245 1.90 104 PST9235 1.40 104 PST9225 0.90 104 PST9244 1.85 104 PST9234 1.35 104 PST9224 0.85 104 PST9243 1.80 104 PST9233 1.30 104 PST9223 0.80 104 PST9242 1.75 104 PST9232 1.25 104 PST9222 0.75 104 PST9241 1.70 104 PST9231 1.20 104 PST9221 0.70 104 PST9240 1.65 104 PST9230 1.15 104 PST9220 0.65 104 PST9239 1.60 104 PST9229 1.10 104 PST9219 0.60 104 PST9238 1.55 104 PST9228 1.05 104 PST9237 1.50 104 PST9227 1.00 104