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| MITSUMI System Reset PST993, 994 System Reset Monolithic IC PST993, 994 Outline The function of this IC is to accurately reset systems after detecting the supply voltage at the time of switching power on and instantaneous power off in various CPU and other logic systems. Further, this IC can be offered at low cost because it is designed to be simplified allowing for the replacement from reset circuit of discrete configuration. Features 1. Voltage detect precision 2. Low consumption current 3. Low operating threshold voltage 4. Hysteresis voltage is provided as detect voltage 5. Large output current at the time ON 6. Detect voltage rank VS5% max. ICCH=300A typ. ICCL=250A typ. 0.65V typ. 50mV typ. 15mA typ. PST993 C : 4.5V H : 3.1V D : 4.2V I : 2.9V E : 3.9V J : 2.7V F : 3.6V K : 2.5V G : 3.3V L : 2.3V (Same ranks for PST994 too) 7. Output form PST993 : Constant current load built-in PST994 : Open collector Packages TO-92A (PST993 , PST994 ) contains detection voltage rank. * Applications 1. Reset circuits for microcomputers, CPU and MPU. 2. Reset circuit for logic circuitry. 3. Level detecting circuit. Pin Assignment 1 2 3 VCC GND VOUT 1 2 3 TO-92A MITSUMI System Reset PST993, 994 Equivalent Circuit Diagram PST993 PST994 Absolute Maximum Ratings Item Storage temperature Operating temperature Supply voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC Pd Ratings -40~+125 -20~+75 -0.3~+10 300 Units C C V mW Electrical Characteristics Item (Ta=25C) (The unit of resistance is unless otherwise indicated.) Measurement Circuit Measurement conditions PST993C PST993D PST993E PST993F PST993G RL= VCC=H L PST993H PST993I PST993J PST993K PST993L RL=, VCC=L H L RL=, Ta=-20~+75C VCC=Vs min. -0.05V, RL=1k VO=2.5V, VCC=5V, RL= VCC=Vs min. -0.05V, RL= VCC=Vs typ. /0.85V, RL= CL=100pF CL=100pF < RL=4.7k, VOL = 0.4V Min. Typ. Max. Units 4.27 4.00 3.70 3.42 3.13 2.94 2.75 2.56 2.37 2.18 30 4.50 4.20 3.90 3.60 3.30 3.10 2.90 2.70 2.50 2.30 50 0.01 0.1 -25 250 300 20 1 1 0.65 0.4 -17 400 500 4.73 4.40 4.10 3.78 3.47 3.26 3.05 2.84 2.63 2.42 100 Symbol V Detection Voltage VS 1 Hysteresis Voltage Detection Voltage Temperature Coefficient Low Level Output Voltage Output Constant Current Circuit Current at ON Time Circuit Current at OFF Time "H" Transmission Delay Time "L" Transmission Delay Time Operating Threshold Voltage Output Current at ON Time 1 VS VS/ T VOL IOC ICCL ICCH tpLH tpHL VOPL IOL1 1 1 1 1 1 1 2 2 1 1 mV %/C V A A A s s V mA mA -40 * 0.85 RL=, VO=0.4V 6 VCC=VS min. -0.05V Ta=-20~+75C, RL= 1 4 Output Current at ON Time 2 IOL2 VO=0.4V, VCC=Vs min. -0.05V Do not apply onto the OUT terminal any voltage higher than that at the VCC terminal. ( 1) The tpLH is a function of the charging time of CL by output constant current. The delay time of this IC is about 1 s. 15 * * MITSUMI System Reset PST993, 994 Absolute Maximum Ratings Item Storage temperature Operating temperature Supply voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC Pd Ratings -40~+125 -20~+75 -0.3~+10 300 Units C C V mW Electrical Characteristics Item (Ta=25C) (The unit of resistance is unless otherwise indicated.) Measurement Circuit Measurement conditions PST994C PST994D PST994E PST994F RL=1k PST994G VCC=H L PST994H PST994I PST994J PST994K PST994L RL=1k, VCC=L H L RL=1k, Ta=-20~+75C VCC=Vs min. -0.05V, RL=1k VCC=10V VCC=Vs min. -0.05V, RL= VCC=Vs typ./0.85V, RL= CL=100pF, RL=4.7k CL=100pF, RL=4.7k RL=4.7k, VOL < 0.4V = VO=0.4V R= VCC=Vs min. -0.05V Ta=-20~+75C R= VO=0.4V, VCC=Vs min.-0.05V Min. Typ. Max. Units 4.27 4.00 3.70 3.42 3.13 2.94 2.75 2.56 2.37 2.18 30 4.5 4.2 3.9 3.6 3.3 3.1 2.9 2.7 2.5 2.3 50 0.01 0.1 250 300 1 1 0.65 6 4 15 0.4 0.1 400 500 4.73 4.40 4.10 3.78 3.47 3.26 3.05 2.84 2.63 2.42 100 Symbol Detection Voltage Vs 1 V Hysteresis Voltage Detection Voltage Temperature Coefficient Low Level Output Voltage Output Leakage Current Circuit Current at ON Time Circuit Current at OFF Time "H" Transmission Delay Time "L" Transmission Delay Time Operating Threshold Voltage Output Current at ON Time 1 Output Current at ON Time 2 Vs Vs/ T VOL IOH ICCL ICCH tpLH tpHL VOPL IOL1 IOL2 1 1 1 1 1 1 2 2 1 1 1 mV %/C V A A A s s V mA mA 0.85 not onto the OUT *Do The apply is a function ofterminal any voltage higher than that at the VCC terminal. ( 1) tpLH the charging time of CL by output constant current. The delay time of this IC is about 1 s. * MITSUMI System Reset PST993, 994 Equivalent Circuit Diagram * Since PST993 incorporates a constant current load, the pull-up resistance is not necessary. Characteristics VS vs. Ta 4300 4280 4260 4240 4220 4200 4180 4160 4140 4120 4100 VOpL vs. Ta 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 VS (mV) VopL (V) -20-10 0 10 20 30 40 50 60 70 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) VS vs. Ta 100 90 80 70 60 50 40 30 20 10 0 VOL vs. Ta 100 90 80 70 60 50 40 30 VS (mV) VOL (mV) -20-10 0 10 20 30 40 50 60 70 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) ICCH vs. Ta 440 400 360 ICCH 320 (A) 280 240 200 160 IOC vs. Ta (PST993) -20 -22 -24 -26 -28 -30 -32 -34 -36 -38 -40 PST993 PST994 IOC (A) -20-10 0 10 20 30 40 50 60 70 -20-10 0 10 20 30 40 50 60 70 Ta (C) Ta (C) |
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