IC for System Reset PST70XX MITSUMI IC for System Reset Monolithic IC PST70XX Series May 21, 2002 Outline This IC is a low-reset type system reset IC and 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 includes a high-precision voltage detection function with ultra-low current consumption and is ideal for voltage check circuits for products using a battery. Features 1. 2. 3. 4. 5. 6. High-precision voltage detection Vs±2% max. Ultra-low current consumption ICCH=2µA typ. ICCL=3µA typ. Low operating limit voltage 0.65V typ. Hysteresis voltage provided for detection voltage 50mV typ. Large output current during power-on 30mA typ. Detection voltage can be selected as desired within a range of 1.9 to 4.6V by 0.1V step, as indicated below. PST70XX Detection voltage value (Example: for 4.6V ....... PST7046) Packages MMP-3A (PST70 M) TO-92A (PST70 ) 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 3 TO-92A 1 VCC 2 GND 3 VOUT 1 3 2 MMP-3A (TOP VIEW) 1 VCC 2 GND 3 VOUT IC for System Reset PST70XX 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 mW 300 (TO-92A) (Ta=25°C) (Except where noted otherwise, resistance unit is Ω) Electrical Characteristics Item 200 (MMP-3A) Symbol Measurement conditions Measurement circuit Min. Typ. Max. Units 4.6~ Detection voltage RL=470 VCC=H VS L 1 VS typ. 1.9 VS typ. -2% (0.1V +2% V Step) VS Hysteresis voltage Detection voltage temperature coefficient V S/ T Low-level output voltage VOL Output leakage current IOH Circuit current while on ICCL Circuit current while off ICCH "H"transport delay time tPLH "L"transport delay time tPHL Operation limit voltage VOPL Output current while on 1 IOL1 Output current while on 2 IOL2 RL=470 VCC=L H L 1 RL=470 Ta=-20~+75°C 1 ±0.01 1 0.2 VCC=VS min. -0.05V RL=470 VCC=10.0V VCC=VS min. -0.05V RL=∞ VCC=VS typ. /0.85V RL=∞ 30 50 1 100 %/°C 0.4 V 0.1 µA 1 3.0 6.0 µA 1 2.0 4.0 µA RL=4.7k 7046~24 2 5 30 CL=100pF 7023~19 2 10 30 RL=4.7k 7046~24 2 30 70 CL=100pF 7023~19 2 70 150 1 0.65 0.85 RL=4.7k VOL <= 0.4V VCC=VS min. -0.05V RL=0 VCC=Vs min. -0.05V RL=0 Ta=-20°C~+75°C mV 1 8 1 5 30 µs µs V mA mA IC for System Reset PST70XX MITSUMI Measuring Circuit [1] [2] *1 *2 0V *1 VS+0.4V *2 VS-0.4V