System Reset PST591~595 MITSUMI System Reset Monolithic IC PST591~595 Series Outline These ICs function in a variety of CPU systems and other logic systems, to detect power supply voltage and reset the system accurately when power is turned on or interrupted, and has a built-in fixed delay time generating circuit. This series has been represented in the past by PST574/PST575, but these new low reset type system reset ICs expand the delay time series with a counter timer using an analog/digital hybrid circuit. Features 1. Fixed delay time setting by counter timer Excellent delay time temperature characteristics 2. Low operating limit voltage 3. Hysteresis voltage provided in detection voltage 4. Current consumption for no-load 5. 5 delay time products available 6. Each product has 9 detection voltage ranks. ±800ppm/°C 0.65V typ. 50mV typ. ICCL=300µA typ. ICCH=200µA typ. PST591 50ms PST592 100ms PST593 200ms C : 4.5V typ. D : 4.2V typ. E : 3.9V typ. F : 3.6V typ. G : 3.3V typ. PST594 400ms PST595 800ms H : 3.1V typ. I : 2.9V typ. J : 2.7V typ. K : 2.5V typ. Package MMP-4A (PST59 M) TO-92A (PST59 ) contains detection voltage rank. (MMP-4A has a manual reset pin, which should be set at GND or NC during normal operation.) * Applications 1. Reset circuits in microcomputers, CPUs and MPUs 2. Logic circuit reset circuits. 3. Battery voltage check circuits. 4. Back-up power supply switching circuits. 5. Level detection circuits. 6. Mechanical reset circuits System Reset PST591~595 MITSUMI Pin Assignment VOUT 1 1 2 1 VCC 2 GND 3 VOUT 4 3 Manual 2 1 3 2 Reset 3 VCC 4 GND MMP-4A (TOP VIEW) TO-92A 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 Manual reset input voltage VRES max. -0.3~10 V Allowable loss Pd 200 (MMP-4P) 300 (TO-92) mW System Reset PST591~595 MITSUMI Electrical Characteristics Item (Ta=25°C) (Except where noted otherwise, resistance unit isΩ) 1 Measurement conditions C D E RL=470 F < G VOL = 0.4V VCC=H L H I J K RL=470, VCC=L H L VS/ T 1 RL=470, Ta=-20°C~+75°C ±0.01 VOL IOH ICCL ICCH 1 1 1 1 0.1 "H" transport delay time tPLH 2 "L" transport delay time Operating power supply voltage Output current while on 1 Output current while on 2 Manual Input high voltage reset Input high current pin Input low voltage tPHL VOPL IOL1 IOL2 VRESH VRESH VRESL 2 1 1 1 VCC=Vs min.-0.05V, RL=470 VCC=10V VCC=Vs min.-0.05V, RL=∞ VCC=Vs typ./0.85V, RL=∞ PST591 PST592 RL=4.7k PST593 CL=100PF 1 PST594 PST595 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 leakage current Circuit current while on Circuit current while off *1 tpLH : V = (V typ.-0.4V) *2 V =V min.-0.15V CC CC S Symbol Measuring circuit VS VS 1 * * * VRES=2V (VS typ.+0.4V), tpHL : VCC= (VS typ.+0.4V) Min. 4.3 4.0 3.7 3.4 3.1 2.9 2.75 2.55 2.35 30 Typ. 4.5 4.2 3.9 3.6 3.3 3.1 2.90 2.70 2.50 50 Max. Unit 4.7 4.4 4.1 3.8 3.5 V 3.3 3.05 2.85 2.65 100 mV %/°C 0.4 ±0.1 600 350 75 150 300 600 1200 V µA µA µA 300 200 30 50 60 100 120 200 ms 240 400 480 800 10 µs 0.65 0.85 V 8 mA 6 mA 2.0 V 80 µA 0.8 V (VS typ.-0.4V) S Note 3: VOUT pin is low when manual reset pin is high. VOUT pin is high when manual reset pin is low. Measuring Circuit [1] [2] Note: Input model is an example for PST591C. System Reset PST591~595 MITSUMI Characteristics (Example: PST591D) VCC vs. VOUT VOUT (V) 8 7 6 5 4 3 2 1 0 0 VS vs. Ta 4.4 4.3 VS (V) Ta=-25°C Ta=25°C Ta=75°C 1 2 3 4.2 4.1 4.0 4 5 6 7 3.9 -40 8 -20 0 VCC (V) 20 Ta VS vs. Ta 40 60 80 40 60 80 40 60 80 40 60 80 (°C) VOL vs. Ta 90 80 250 70 200 VS 60 (mV) 50 VOL (mV) 40 100 50 30 -40 150 0 -20 0 20 Ta 40 60 -40 80 ICCH vs. Ta 450 230 400 220 350 ICCH (µA) 300 250 210 200 -20 0 20 40 60 180 -40 80 -20 0 Ta(°C) 20 Ta IOL vs. Ta (°C) tPLH vs. Ta 40 53 35 52 IOL 30 (mA) 25 tPLH 51 (ms) 50 20 49 15 48 -40 20 190 200 -40 0 Ta (°C) ICCL vs. Ta ICCL (µA) -20 (°C) -20 0 20 Ta (°C) 40 60 80 -40 -20 0 20 Ta (°C) System Reset PST591~595 MITSUMI tPHL vs. Ta Pd vs. Ta 300 12 11 tPHL (µs) 10 Pd (mW) 9 TO92 100 8 MMP4 7 -40 200 -20 0 20 40 60 0 80 0 25 50 75 Ta Ta (°C) 100 125 (°C) Timing Chart 7 6 5 VCC/VOUT (V) 4 3 2 1 0 VCC VS VOUT Time Undefined RESET ON OFF Application circuits 1. Normal hard reset Note: Connect a capacitor between IC VCC and GND pins if VCC line impedance is high. MITSUMI System Reset PST591~595 2. Manual reset VOUT pin low for manual switch ON. VOUT pin high for manual switch OFF. Note1: Connect a capacitor between IC VCC and GND pins if VCC line impedance is high. Note2: Thoroughly check the actual operation of the circuit, then set the manual reset when pressing the manual switch ON to about 2µs. 3. Mute circuit Note: Connect a capacitor between IC VCC and GND pins if VCC line impedance is high.