PST573 PST573C PST573D PST573E PST573F PST573G PST573H PST573I PST573J PST573K

MITSUMI IC for System Reset Monolithic IC PST573 November 21, 2001 Outline This IC functions in a variety of CPU systems and

IC for System Reset PST573 PST573 MITSUMI IC for System Reset Monolithic IC PST573 PST573 November 21, 2001 Outline This IC functions in a variety of CPU systems and other logic systems, to detect supply voltage and reset the system accurately when the power is turned on or interrupted. It is a high-reset type system reset IC with ultra-low current consumption developed using high-resistance process and current-minimizing circuit design technology. Features 1. 2. 3. 4. 5. Ultra-low current consumption Low operating limit voltage Large output current during power-on Hysteresis voltage provided for detection voltage 10 ranks of detection voltages are available. ICCH=450µA typ. ICCL=1µA typ. 0.65V typ. -6mA typ. 50mV typ. PST573 PST573 C : 4.5V typ. D : 4.2V typ. E : 3.9V typ. F : 3.6V typ. G : 3.3V typ. H : 3.1V typ. I : 2.9V typ. J : 2.7V typ. K : 2.5V typ. L : 2.3V typ. Packages MMP-3A (PST573 PST573 M) TO-92A (PST573 PST573 ) The box represents a rank of detection voltage. * Applications 1. 2. 3. 4. 5. Reset circuits for microcomputers, CPUs and MPUs Reset circuits for logic circuits Battery voltage check circuits Back-up power supply switching circuits Level detection circuits Pin Assignment 1 2 2 VOUT 1 3 GND 3 1 VCC 3 TO-92A MMP-3A (TOP VIEW) VCC 2 2 1 GND 3 VOUT IC for System Reset PST573 PST573 MITSUMI Equivalent Circuit Diagram Absolute Maximum Ratings (Ta=25°C) Item Symbol Rating Units Storage temperature TSTG -40~+125 °C Operating temperature TOPR -20~+75 °C Power supply voltage VCC max. -0.3~10 V Allowable loss Pd Electrical Characteristics Item Symbol Detection voltage VS Measurement circuit High level output voltage VOH 1 Output leakage current IOH 1 Circuit current while on ICCL 1 Circuit current while off ICCH 1 "H"transport delay time tpLH 2 "L"transport delay time tpHL 2 Operation limit voltage VopL 1 Output current while on 1 IOL I 1 Output current while on 2 IOL II 1 CC S Typ. Max. Units PST573C PST573C PST573D PST573D PST573E PST573E PST573F PST573F PST573G PST573G PST573H PST573H PST573I PST573I PST573J PST573J PST573K PST573K PST573L PST573L 4.3 4.0 3.7 3.4 3.1 2.9 2.75 2.55 2.35 2.15 4.5 4.2 3.9 3.6 3.3 3.1 2.90 2.70 2.50 2.30 4.7 4.4 4.1 3.8 3.5 3.3 3.05 2.85 2.65 2.45 V 25 50 100 mV RL=4.7k VOL < VCC-0.4V = VCC=H L RL=4.7k Ta=-20°C~+75°C 1 S Min. RL=4.7k VCC=L H L VS/ T CC Measurement conditions 1 Detection voltage temperature coefficient *1 : tpLH : V =(V typ.-0.4V) *2 : V =V min.-0.15V mW 300(TO-92A) (Ta=25°C) (Except where noted otherwise, resistance unit is ) 1 VS Hysteresis voltage 200(MMP-3A) VCC=VS min. -0.05V RL=4.7k VCC=7.5V VCC=VS min. -0.05V RL= VCC=VS typ. /0.85V RL= RL=4.7k 1 CL=100pF RL=4.7k 1 CL=100pF RL=4.7k VOL > VCC-0.4V = VCC=VS min.-0.05V RL=0 Ta=-20°C~+75°C 2 RL=0 ±0.01 VCC -0.4 (VS typ.+0.4V), tpHL : VCC=(VS typ.+0.4V) V 0.1 700 µA 1.0 1.8 µA 25 60 µs 8 20 µs 0.65 -2.0 µA 450 * * * %/°C 0.85 V -6.0 -1.5 (VS typ.-0.4V) mA mA IC for System Reset PST573 PST573 MITSUMI Measuring Circuit [1] [2] INPUT PULSE 4.9V 4.1V 0V 0.8V 4.9 VS 4.1 0V Note: Input model is an example for PST573C PST573C. Characteristics (Example: PST573C PST573C) VCC vs. VOUT VCC vs. ICC 600 8 7 Ta=-20°C 500 6 ICC (µA) 300 VOUT (V) 4 3 1 1 2 3 4 VCC (V) Ta=75°C 200 Ta=-20°C Ta=25°C Ta=75°C 2 0 Ta=25°C 400 5 100 5 6 7 8 0 0 1 2 3 4 VCC (V) 5 6 7 8 IC for System Reset PST573 PST573 MITSUMI VS vs. Ta VS vs. Ta 4.53 80 4.52 70 4.51 60 VS 4.50 (V) VS 50 (mV) 4.49 40 4.48 30 4.47 -40 20 -20 0 20 40 60 80 -40 -20 0 Ta (°C) 20 40 60 80 40 60 80 40 60 80 Ta (°C) IOL vs. Ta VOH vs. Ta -9 4.25 -8 4.20 -7 4.15 IOL -6 (mA) VOH (V) 4.10 -5 4.05 -4 4.00 -3 4.95 -40 -20 0 20 40 60 -40 80 -20 0 Ta (°C) 20 Ta (°C) ICCH vs. Ta ICCL vs. Ta 700 1.8 600 1.6 500 1.4 ICCH (µA) lCCL 400 (µA) 1.2 300 1.0 200 0.8 0.6 -40 100 -20 0 20 40 60 80 -40 -20 Ta (°C) Pd vs. Ta VS (CPU)=0.7VCC 10.0 300 0k =1 k L R 1.0 CL (µF) 20 Ta (°C) CL (RL) vs. tPLH 7 5 3 2 0 7 5 3 2 00 =1 RL 0k 200 7 =4 Pd (mW) L R 100 0.1 7 5 3 2 0.01 0 1 2 345 7 10 2 3 4 5 7 100 tPLH (ms) 2 3 4 5 7 1000 0 25 50 75 Ta (°C) 100 125 IC for System Reset PST573 PST573 MITSUMI Timing Chart VCC/VOUT (V) 7 6 5 4 3 2 1 0 VCC VS VOUT VS (CPU) Time Undefined RESET ON OFF Application circuits 1. Normal hard reset Delay time (tpLH) VCC-0.2 . = CL RL ln . Vscpu CL : µF [ RL : k Vs cpu : ]+0.025 (ms) Reset threshold voltage of CPU, MPU, etc. Voltage: V Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 2. Manual reset added Note 1: Use RL, CL and Rm to prevent manual switch chattering. Note that Rm should be set to the following conditions. Rm < 1/20RL 1/20RL = Note 2: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 3. Battery checker (LED ON for high voltage) Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. MITSUMI IC for System Reset PST573 PST573 4 Battery checker (LED ON for low voltage) Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 5. Hysteresis voltage UP method When increasing hysteresis voltage for stable system operation, determine RH as follows and connect externally. However, ICCH is -5000PPM/ -5000PPM/°C, so perform temperature compensation at RH when using over a wide temperature range. Hysteresis voltage UP amount ( Vsup) is . Vsup = RH ICCL . Total hysteresis voltage ( Vstotal) is . Vstotal = Vs + Vsup . Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high.