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| MITSUMI System Reset PST600 System Reset Monolithic IC PST600 Outline This IC operates in a variety of CPU systems and other logic systems by detecting power supply voltage, so that the system can be reset accurately when power is turned on or when power is momentarily cut. PST572 and others perform the same function as does this series, but this IC is a low reset type system resetting IC which follows load current so that circuit current flow increases for ON, and has low current consumption for both ON and OFF. Features 1. Follows load current so that circuit current flow increases for ON, and has low current consumption for both ON and OFF. No load : ICCL=7A typ.; ICCH=5A typ. 2. Low operating limit voltage 0.65V typ. 3. Hysteresis voltage provided in detection voltage 50mV typ. 4. The following 10 ranks of detection voltages are available. PST600 C : 4.5V typ. H : 3.1V typ. D : 4.2V typ. I : 2.9V typ. E : 3.9V typ. J : 2.7V typ. F : 3.6V typ. K : 2.5V typ. G : 3.3V typ. L : 2.3V typ. Package MMP-3A (PST600 M) TO-92A (PST600 ) contains detection voltage rank. * Applications 1. Microcomputers, CPU, MPU reset circuits 2. Logic circuit reset circuits 3. Battery voltage check circuits 4. Back-up power supply switching circuits 5. Level detection circuits Equivalent Circuit MITSUMI System Reset PST600 Pin Assignment 1 2 3 1 2 3 VCC GND VOUT 1 3 1 2 VCC GND VOUT 2 3 TO-92A MMP-3A Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC max. Pd Ratings -40~+125 -20~+75 -0.3~10 200 (MMP-3A) 300 (TO-92A) Units C C V mW Electrical Characteristics Item (Ta=25C) (unless otherwise indicated resistance unit is ) Measurement circuit Symbol Measurement conditions PST600C PST600D PST600E PST600F RL=470 PST600G VOL < 0.4V = PST600H VCC=H L PST600I PST600J PST600K PST600L RL=470, VCC=L H L RL=470, Ta=-20C~+75C VCC=Vs min. -0.05V, RL=470 VCC=10V IOL=0mA VCC=Vs min. -0.05V IOL=8mA VCC=Vs typ./0.85V, RL= RL=4.7k, CL=100pF 1 RL=4.7k, CL=100pF 1 RL=4.7k, VOL < 0.4V = VCC=Vs min. -0.05V, RL=0 Ta=-20C~+75C, RL=0 2 Min. Typ. Max. Units 4.3 4.0 3.7 3.4 3.1 2.9 2.75 2.55 2.35 2.15 30 4.5 4.2 3.9 3.6 3.3 3.1 2.90 2.70 2.50 2.30 50 0.01 0.3 7 50 5 40 20 0.65 0.4 0.1 14 130 10 80 40 0.85 4.7 4.4 4.1 3.8 3.5 3.3 3.05 2.85 2.65 2.45 100 Detection voltage Vs 1 V Hysteresis voltage Detection voltage temperature coefficient Low level output voltage Output leak current Circuit current for ON Circuit current for OFF H transmission delay time L transmission delay time Operating limit voltage Output current 1 for ON Output current 2 for ON Vs Vs/ T VOL IOH ICCL ICCH tPLH tPHL VopL IOL 1 IOL 2 1 1 1 1 1 1 2 2 1 1 1 mV %/C V A A A S S V mA mA * * 20 10 8 6 * * * 1 tPLH : VCC= (Vs typ. -0.4V) 2 VCC=Vs min. -0.15V (Vs typ.+0.4V), tPLH : VCC= (Vs typ.+0.4V) (Vs typ.-0.4V) MITSUMI System Reset PST600 Measurement Circuit [1] [2] VS 4.9 4.1 0V * The input model is an example of PST600C (MMP-3P). Characteristics VCC vs. VOUT 8 7 6 5 Vout 4 (V) 3 2 1 0 0 (PST600C is used as the representative model for characteristics examples.) VOL vs. Ta 450 400 Ta=-25C Ta=25C Ta=75C 1 2 3 4 5 6 7 8 VOL 350 (mV) 300 250 200 -40 -20 0 20 40 60 80 VCC (V) Ta (C) VS vs. Ta 80 70 60 VS vs. Ta 4.7 4.6 VS 50 (mV) 40 30 20 -40 -20 0 20 40 60 80 VS (V) 4.5 4.4 4.3 4.2 -40 -20 0 20 40 60 80 Ta (C) Ta(C) ICCL vs. IOL 100 80 60 40 20 0 0 2 4 6 8 10 12 ICCH vs. Ta 8 7 6 5 4 3 -40 -20 0 20 40 60 80 ICCL (A) ICCH (A) IOL (mA) Ta(C) MITSUMI System Reset PST600 IOL vs. Ta 60 50 40 30 20 10 -40 -20 0 20 40 60 80 VOL vs. IOL 500 400 IOL (mA) VOL (mV) 300 200 100 0 0 2 4 6 8 10 12 Ta (C) IOL (mA) ICCL (IOL=0mA) vs. Ta 9 8 7 6 5 4 -40 -20 0 20 40 60 80 ICCL (A) Ta (C) Application Circuits 1. Normal hard reset Delay Time (tPLH) ** =CL RL VCC [ln ------------------------ ]+0.040 (mS) VCC- (VS CPU+0.2) Vs CPU : CPU, MPU reset threshold voltage CL : F RL : k Voltage : V Note : When VCC line impedance is high, connect a capacitor between IC Pins 1 and 2. 2. Manual Reset Note : Prevent Manual SW chattering by using RL , CL and Rm. Rm setting conditions are as follows : Rm < 1/20 RL = Note : When VCC line impedance is high,connect a capacitor between IC Pins 1 and 2. MITSUMI 3. Battery Checker (LED ON for High voltage) System Reset PST600 Note : When VCC line impedance is high, connect a capacitor between IC Pins 1 and 2. 4. Battery Checker (LED ON for Low voltage) Note : When VCC line impedance is high, connect a capacitor between IC Pins 1 and 2. |
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