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| MITSUMI System Reset PST575 System Reset Monolithic IC PST575 Outline This IC functions 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. This ultra-low current consumption low reset type system reset IC has a built-in delay time generating circuit that can set the time by an external capacitor and resistor. It is ideal for use in multi-CPU systems because a fast-rising output waveform can be obtained. Features 1. Ultra-low current consumption 2. Low operating limit voltage 3. Output current high for ON 4. Hysteresis voltage provided in detection voltage 5. Delay time can set over a wide range using external capacitor and resistor. 6. 10 ranks of detection voltage ICCH=7.5A typ. ICCL=400A typ. 0.65V typ. 30mA typ. 50mV typ. 10S~10S PST575 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. Package MMP-4A (PST575 M) DIP-8A (PST575 ) contains detection voltage rank * Applications 1. Reset circuits in microcomputers, CPUs and MPUs (especially multi-CPU sets) 2. Logic circuit reset circuits. 3. Battery voltage check circuits. 4. Back-up power supply switching circuits. 5. Level detection circuits. Pin Assignment 3 4 5 1 2 3 4 7 GND Cd VOUT VCC 1 2 1 2 3 4 VCC VOUT Cd GND 8 7 6 5 4 3 DIP-8A MMP-4A MITSUMI System Reset PST575 Equivalent Circuit Diagram Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC max. Pd Rating -40~+125 -20~+75 -0.3~10 200 (MMP-3A) 300 (TO-92A) Units C C V mW Electrical Characteristics Item (Ta=25C) (Except where noted otherwise, resistance unit is ) Measurement conditions PST575C PST575D PST575E PST575F RL=470 PST575G VOL < 0.4V = PST575H VCC=H L PST575I PST575J PST575K PST575L RL=470, VCC=L H L RL=470, Ta=-20C~+75C Min. 4.3 4.0 3.7 3.4 3.1 2.9 2.75 2.55 2.35 2.15 25 Typ. 4.5 4.2 3.9 3.6 3.3 3.1 2.90 2.70 2.50 2.30 50 0.01 Max. Units 4.7 4.4 4.1 3.8 3.5 V 3.3 3.05 2.85 2.65 2.45 100 mV %/C 0.4 V 0.1 A 650 A 12.0 A 1.75 mS 20 S 0.85 V mA mA 3.9 V Symbol Measuring circuit Detection voltage VS 1 Hysteresis voltage Detection voltage temperature coefficient Low-level output voltage Output leakage current Circuit current while on Circuit current while off "H" transport delay time "L" transport delay time Operating power supply voltage Output current while on I Output current while on II Threshold voltage for delay time setting comparator (CO2) VS VS/ T VOL IOH ICCL ICCH tpLH tpHL VopL IOL I IOL II Vtsh 1 1 1 1 1 1 2 2 1 1 1 1 VCC=Vs min.-0.05V, RL=470 0.1 VCC=7.5V VCC=Vs min.-0.05V, RL= 400 VCC=Vs typ./0.85V, RL= 7.5 Rd=100k, Cd=0.01F 1 0.75 1.25 Rd=100k, Cd=0.01F 1 6 < RL=4.7k, VOL = 0.4V 0.65 VCC=Vs min.-0.05V, RL=0 8 30 Ta=-20C~+75C, RL=0 2 5 VCC=5.0V, Rd=100k, Cd=0.01F 3.5 3.7 RL=4.7k, CL=100pF * * * *1 : tpLH : VCC= (VS typ.-0.4V) *2: VCC=VS min.-0.15V (VS typ.+0.4V), tpHL : VCC= (VS typ.+0.4V) (VS typ.-0.4V), CL=100pF MITSUMI System Reset PST575 Measuring Circuit [1] (Example: PST575C) [2] Input pulse 0.8V VS 4.9 4.1 0V Note: Input model is an example for PST575C (MMP-4P). Characteristics VCC vs. VOUT 8 7 6 (Example: PST575C) VCC vs. ICC 500 400 Ta=-20C Ta=25C VOUT (V) 5 4 3 2 1 0 1 Ta=-25C Ta=25C Ta=75C 2 3 4 5 6 7 8 ICC 300 (A) 200 100 0 0 Ta=75C VCC (V) 1 2 3 4 5 6 7 8 VCC (V) VS vs. Ta 4.53 4.52 4.51 VS vs. Ta 80 70 60 VS (V) 4.50 4.49 4.48 4.47 -40 -20 0 20 40 60 80 VS 50 (mV) 40 30 20 -40 -20 0 20 40 60 80 Ta (C) Ta (C) MITSUMI System Reset PST575 IOL vs. Ta 60 50 VOL vs. Ta 300 250 IOL (mA) 40 30 20 10 -40 -20 0 20 40 60 80 VOL (mV) 200 150 100 50 -40 -20 0 20 40 60 80 Ta (C) Ta (C) ICCH vs. Ta 10 9 8 ICCL vs. Ta 500 lCCH (A) 7 6 5 4 -40 -20 0 20 40 60 80 ICCL 400 (A) 300 -40 -20 0 20 40 60 80 Ta (C) Ta (C) Cd (Rd) vs. tpLH 10.0 7 5 3 2 tpLH vs. Ta Rd=100k Cd=0.01F (Mylar) 1.7 1.6 1.0 Cd (F) 7 5 3 2 10 d= R k 1.5 10 d= R 0k 70 k tpLH 1.4 (mS) 1.3 1.2 1.1 -40 -20 0 20 40 60 80 0.1 7 5 3 2 =4 Rd Ta (C) 1 2 34 5 7 10 2 34 5 7 100 2 3 4 5 7 1000 0.01 tpLH (mS) Pd vs. Ta 300 200 Pd (mW) 100 0 0 25 50 75 100 125 Ta (C) MITSUMI System Reset PST575 Timing Chart 7 6 5 VCC VS VCC/VOUT (V) 4 3 2 1 0 Variable Time VOUT Undefined RESET ON OFF Application Circuits 1. Normal hard reset (Pin numbers are for an example of MMP-4P.) Delay time (tPLH) ** =1.3Cd Rd+0.007 (mS) Cd : F Rd : k Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 2. Manual reset added Note: Use RL, CL and Rm to prevent manual switch chattering. Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. MITSUMI 3. Battery checker (LED ON for high voltage) System Reset PST575 Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. 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/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 (Operation will be destabilized is RH is raised too much.) Note: Connect a capacitor between IC pins 1 and 2 if VCC line impedance is high. |
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