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MAX690TESA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX690TESA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page 3.0V/3.3V Microprocessor Supervisory Circuits 10 ______________________________________________________________________________________ MAX690T/S/R MAX704T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R MAX806T/S/R VCC GND 0V TO µP VL = R1 VPFT PFI PFO R1 R2 R3 *OPTIONAL C1* VIN VTRIP VIN PFO 0V VH VL R1 + R2 R2 VH = (VPFT + VPFH) (R1) VTRIP = VPFT + R1 1 + R2 1 R3 1 – R3 VCC VPFT = 1.237V VPFH = 10mV WHERE VCC GND TO µP PFI PFO R1 R2 R3 *OPTIONAL C1* VIN R1 + R2 R2 VH = R1 (VPFT + VPFH) VTRIP = VPFT + R1 1 + R2 1 R3 1 – R3 (VCC - VD) VPFT = 1.237V VPFH = 10mV VD = DIODE FORWARD VOLTAGE DROP VL = VTRIP WHERE MAX690T/S/R MAX704T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R MAX806T/S/R 0V PFO 0V VH VIN VTRIP b a ( ) ( ) ( ) ( ) + R1 1 + R2 1 R3 1 ( ) MAX690T/S/R MAX704T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R MAX806T/S/R VCC GND PFI PFO R1 R2 V- 0V V- PFO VTRIP VL VPFT = 1.237V VPFH = 10mV WHERE 3.0V OR 3.3V VTRIP = R2 + R1 1 ) ( R2 1 – R1 VCC (VPFT + VPFH) VL = R2 + R1 1 ) ( R2 1 – R1 VCC (VPFT) NOTE: VTRIP IS NEGATIVE VCC MAX690T/S/R MAX704T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R MAX806T/S/R VCC GND PFI PFO R1 R2 PFO VTRIP VH * MAX704T/S/R, MAX806T/S/R ONLY 3.0V OR 3.3V VIN VTRIP = ) ( R2 R1 + R2 VPFT VH = (VPFT + VPFH) VCC VIN MR * b a ) ( R2 R1 + R2 Figure 4. a) Adding Additional Hysteresis to the Power-Fail Comparator b) Shifting the Additional Hysteresis above VPFT Figure 5. Using the Power-Fail Comparator to Monitor an Additional Power Supply |
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