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=7µA typ.; ICCH=5µA 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 System Reset PST600 MITSUMI Pin Assignment 1 2 1 VCC 2 GND 3 VOUT 1 3 2 VCC 2 GND 3 VOUT 3 MMP-3A TO-92A Absolute Maximum Ratings (Ta=25°C) Item Storage temperature Operating temperature Power supply voltage Symbol TSTG TOPR VCC max. Allowable loss Pd Electrical Characteristics Item Ratings -40~+125 -20~+75 -0.3~10 200 (MMP-3A) 300 (TO-92A) Units °C °C V mW (Ta=25°C) (unless otherwise indicated resistance unit is Ω) Symbol Measurement circuit Measurement conditions Min. Typ. Max. Units 1 PST600C PST600D PST600E PST600F RL=470 PST600G VOL <= 0.4V PST600H VCC=H L PST600I PST600J PST600K PST600L RL=470, VCC=L H L Vs/ T 1 RL=470, Ta=-20°C~+75°C ±0.01 VOL IOH 1 1 0.3 Circuit current for ON ICCL 1 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 ICCH tPLH tPHL VopL IOL 1 IOL 2 1 2 2 1 1 1 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=-20°C~+75°C, RL=0 2 Detection voltage Hysteresis voltage Detection voltage temperature coefficient Low level output voltage Output leak current * * 1 1 tPLH : VCC= (Vs typ. -0.4V) 2 VCC=Vs min. -0.15V Vs Vs 1 (Vs typ.+0.4V), tPLH : VCC= (Vs typ.+0.4V) 4.3 4.0 3.7 3.4 3.1 2.9 2.75 2.55 2.35 2.15 30 * * * (Vs typ.-0.4V) 20 10 8 6 4.5 4.2 3.9 3.6 3.3 3.1 2.90 2.70 2.50 2.30 50 7 50 5 40 20 0.65 4.7 4.4 4.1 3.8 3.5 3.3 3.05 2.85 2.65 2.45 100 V mV %/°C 0.4 ±0.1 14 130 10 80 40 0.85 V µA µA µA µS µS V mA mA System Reset PST600 MITSUMI Measurement Circuit [1] [2] VS 4.9 4.1 0V * The input model is an example of PST600C (MMP-3P). Characteristics (PST600C is used as the representative model for characteristics examples.) VCC vs. VOUT 8 7 6 5 Vout 4 (V) 3 2 1 0 VOL vs. Ta 450 400 VOL 350 (mV) 300 Ta=-25°C Ta=25°C Ta=75°C 0 1 2 3 250 4 5 6 7 200 -40 8 -20 0 VCC (V) 20 Ta VS vs. Ta 40 60 80 40 60 80 40 60 80 (°C) VS vs. Ta 80 4.7 70 4.6 60 VS (V) VS 50 (mV) 40 4.5 4.4 30 4.3 20 -40 4.2 -20 0 20 40 60 80 -40 -20 0 Ta(°C) Ta (°C) ICCL vs. IOL ICCL (µA) ICCH vs. Ta 100 8 80 7 60 ICCH (µA) 40 6 5 4 20 0 0 20 2 4 6 IOL (mA) 8 10 12 3 -40 -20 0 20 Ta(°C) System Reset PST600 MITSUMI IOL vs. Ta VOL vs. IOL 500 60 400 50 IOL (mA) VOL (mV) 40 30 200 100 20 10 -40 300 -20 0 20 40 60 0 0 80 2 4 6 8 10 12 IOL (mA) Ta (°C) ICCL (IOL=0mA) vs. Ta 9 8 ICCL (µA) 7 6 5 4 -40 -20 0 20 40 60 80 Ta (°C) Application Circuits 1. Normal hard reset Delay Time (tPLH) ··CL = RL V [ln ———————————— ]+0.040 (mS) +0.2) V - (VS CC CC CPU Vs CPU : CPU, MPU reset threshold voltage CL : µF RL : kΩ 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 System Reset PST600 3. Battery Checker (LED ON for High voltage) 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.