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| MITSUMI System Reset PST623 System Reset Monolithic IC PST623 Outline This low reset type IC functions in CPU and other logic systems to detect input voltage and reset the system accurately when power is turned on or interruped. Features 1. 2. 3. 4. 5. 6. 7. Detection voltage can be set easily (2 external resistors) High percision voltage detection Internal reference voltage Enables high voltage check (at stage before Reg) Low operating limit voltage High output current during ON Low current consumption Built-in delay circuit (1 external capacitor) 1.252% 0.65V typ. 10mA min. 40A typ. Applications 1. Reset circuits in microcomputers, CPUs and MPUs 2. Logic circuit reset circuits 3. Level detection circuits Package VSOP-8A (PST623XS) SIP-5A (PST623XW) Pin Assignment 1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 VSOP-8A 8 VS NC TC GND RESET NC NC VCC 1 2 3 SIP-5A 4 5 1 2 3 4 5 VCC VS TC GND RESET MITSUMI System Reset PST623 Absolute Maximum Ratings (Ta=25C) Symbol TSTG VCC max. Pd max. VID Rating -40~+125 10 300 -0.3~VCC Units C V mW V Item Storage temperature Maximum power supply voltage Allowable power consumption Input pin voltage Recommended Operating Conditions Item Power supply voltage Operating temperature Symbol VCCOP TOPG Rating 2.0~10.0 -25~+75 Units V C Electrical Characteristics Item Detection reference voltage Hysteresis voltage Detection reference voltage temperature coefficient L level output voltage Output leakage current Circuit current while on Circuit current while off "H" transport delay time "L" transport delay time Operation limit voltage Output current while on Delay time setting comparator Threshold level Capacitor charging current Vs input current (Except where noted otherwise, VCC=5V, Ta=25C) Measurement conditions RL=470, VIN=H L RL=470, VIN=L H L RL=470, Ta=-25~+75C VIN=1.0V, RL=470 VIN=1.5V, VOUT=10V VIN=1.0V, RL= VIN=1.5V, RL= RL=4.7k, Cd=0.047uF RL=4.7k, Cd=0.047uF < RL=4.7k, VOL = 0.4V Minimum power supply voltage for which output can maintain Lo. VIN=1.0V, RL=0 RL=470, VTC=L H Min. Typ. Max. Units 1.225 1.25 1.275 V 12 25 50 mV 0.01 0.3 50 42 110 15 0.65 10 1.25 0.39 1.4 0.60 40 1.55 0.81 0.45 0.1 90 70 %/C V A A A mS S V mA V A nA Symbol VS VS Vs T VOL IOH ICCL ICCH tpLH tpHL VOPL IOL Vtsh ITC IIN 0.85 VIN=1.5V, VTC=0.2V VIN=1.35V Equivalent Circuit Diagram VSOP-8A SIP-5A MITSUMI System Reset PST623 Notes on Using PST623 1. Input voltage rise and fall VS+0.4V VS VS-0.4V 30S Be sure to give an incline of more than 30S to rise and fall for input with varied power supply voltage (VCC) and bleeder resistance. Also, when setting input bleeder resistance, VS pin input current is affected and the detection voltage setting will differ from the set value if current on the bleeder resistor is too low. Use input bleeder resistor R2 at 250k or less. 2. Delay time setting H transmission delay time can be set easily as follows from the TC pin, using the external capacitor. T = Cd (2.33 106) [S] Use the external capacitor at 1F (approx. 2.33S) or less. Characteristics Current consumption for OFF 70 65 60 55 50 45 40 35 30 25 20 15 Detection voltage 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 -30 -10 10 30 50 70 ICC (A) 0 1 2 3 4 5 6 7 8 9 10 VCC (V) Detection voltage (V) H transport delay time (S) H transport delay time 101 H transport delay time (S) 100 10-1 10-2 10-3 10-4 10-5 10-4 10-3 10-2 10-1 100 Capacitance (F) MITSUMI System Reset PST623 Application Circuits 1. Circuit Diagram 2. Detection Voltage Setting R1+R2 = VS * * 1.25 * -- -- -- ------ R2 * Notevalue of I2 should be sufficient to ignore I3. The Make I2 > 5A. R2 < 250k 3. How to widen hysteresis Voltage VIN1 so that Q1 ON goes OFF. (R1+R2) R1//R2 VIN1=------------------ [1.25 (V) * (R3+R1//R2+R4//R5) - -------- (R4 * VBE+R5 * VCC)] R2 * (R3+R4//R5) R4+R5 Voltage VIN2 so that Q1 OFF goes ON. (R1+R2) VIN2=---------- [1.275 (V) * (R1//R2+R3) -VOL * (R1//R2)] R2 * R3 VOL: Low level output voltage VBE: Base-emitter voltage of transistor Q1 R1 * R2 -------- R1+R2 R4 * R5 -------- R4+R5 R1//R2 R4//R5 |
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