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| 7 Semiconductor S72NxxSF Standard Voltage Detector Description 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 system. Further, this IC, with its super low consumption current is most suited as a voltage check circuit for a number of products which use batteries. Features * Super low current consumption (ICCL = 1.0uA Typ.) * High current of output transistor (IOL=20mA Typ.) * Hysteresis circuit built in (VS=100mV Typ.) * It has on delay function to supplement the constant of outer C and R. Applications * Reset circuits for microcomputers, CPU and MPU. * Reset circuit for logic circuitry. * Battery voltage check circuit. * Circuit for changing over to backup battery. * Level detecting circuit. Ordering Information Type NO. S72NxxSF Marking N : Detecting Voltage Code Package Code SOT-23F Unit : mm Outline Dimensions 2.40.1 1.60.1 1 1.90 BSC 2.90.1 3 2 0.150.05 0.40.05 PIN Connections 1. OUT 2. GND 3. Vcc KSI-2055-000 0.90.1 0~0.1 1 S72NxxSF Equivalent Circuit Diagram Vcc OUT GND Maximum ratings Characteristic Supply voltage Power Dissipation (Package Limitation) Operating Temperature Storage Temperature Symbol Vcc PD * Topr Tstg Ratings -0.3 ~ +10 300 -20 ~ +75 -40 ~ +125 (Ta=25C) Unit V mW * With PCB(8x8 Copper Area) at Glass Epoxy Board (t=1.7 , Area; 20x20 ) Electrical Characteristics Characteristic Detecting Voltage Hysteresis Voltage Temperature Coefficient Of detecting voltage Low Level Output voltage Circuit current at ON Circuit current at OFF Threshold Operating Voltage Output Current at ON I Output Current at ON II LH Transmission delay time HL Transmission delay time (Vcc=5V, Ta=25C) Symbol VS VS VS/T VOL ICCL ICCH Vopr IOL 1 IOL 2 tPLH tPHL Test Circuit 1 1 1 1 1 1 1 1 1 2 2 Test Condition Min. * See Table 1 Typ. Max. Unit RL=470,VCC=LHL RL=470, Ta= -20~75 RL=470, VCC= VS Min RL=, VCC= VS Min RL=,VCC=VS Max +0.1V RL=4.7 , VOL0.4V RL=0, VCC= VS Min RL=0, VCC= VS Min , Ta= -20~75 RL=4.7 , CL=100 RL=4.7 , CL=100 40 10 5 - 100 0.01 0.1 100 1.0 1.4 20 100 10 300 0.4 180 2.5 1.6 500 20 mV %/ V A A V mA mA KSI-2055-000 2 S72NxxSF * Table 1 Electrical Characteristics Characteristic Symbol Test Circuit Test Condition S72N45SF S72N42SF S72N39SF S72N36SF (Vcc=5V, Ta=25C) Min. 4.30 4.00 3.70 3.40 3.10 2.90 2.75 2.55 2.35 2.15 Typ. 4.5 4.2 3.9 3.6 3.3 3.1 2.9 2.7 2.5 2.3 Max. 4.70 4.40 4.10 3.80 3.50 3.30 3.05 2.85 2.65 2.45 Unit Detecting voltage VS 1 RL=470 VCC=HL VOL0.4V S72N33SF S72N31SF S72N29SF S72N27SF S72N25SF S72N23SF V KSI-2055-000 3 S72NxxSF Test Circuit 1 Test Circuit 2 Application Circuit (1) Battery Low Indicator (2) CPU Resetting (Note) (1) Connecting of LED and R2 obtains a voltage drop indicator. (2) Connecting of C1 and selection of time constant with C1 and R1 set the power on delay time. KSI-2055-000 4 S72NxxSF Electrical Characteristic Curves Fig. 1 VO - VCC Fig. 2 ICC - VCC Fig. 3 VS - Ta Fig. 4 VS - Ta Fig. 5 ICCL - Ta Fig. 6 VOL - Ta KSI-2055-000 5 S72NxxSF Fig. 7 IOL - Ta Fig. 8 ICCH - Ta Fig. 9 CL - tPLH KSI-2055-000 6 S72NxxSF These AUK products are intended for usage in general electronic equipments(Office and communication equipment, measuring equipment, domestic electrification, etc.). Please make sure that you consult with us before you use these AUK products in equipments which require high quality and/or reliability, and in equipments which could have major impact to the welfare of human life(atomic energy control, airplane, spaceship, traffic signal, combustion central, all types of safety device, etc.). AUK cannot accept liability to any damage which may occur in case these AUK products were used in the mentioned equipments without prior consultation with AUK. KSI-2055-000 7 |
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