MAX690S Maxim Integrated Products, Inc., MAX690S Datasheet
MAX690S
Available stocks
Related parts for MAX690S
MAX690S Summary of contents
Page 1
Rev 2; 12/05 3.0V/3.3V Microprocessor Supervisory Circuits _______________General Description These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system relia- bility and accuracy ...
Page 2
... MAX690_C_ _/MAX704_C_ _/MAX80_ _C_ _ ........0°C to +70°C MAX690_E_ _/MAX704_E_ _/MAX80_ _E_ _. .....-40°C to +85°C MAX690_M_ _/MAX704_M_ _/MAX80_ _M_ _...-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C = 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S unless otherwise noted. Typical values are at T ...
Page 3
... Output Voltage RESET Output Leakage Current (Note 9) _______________________________________________________________________________________ = 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S unless otherwise noted. Typical values are MIN MAX CONDITIONS I = 250µA, VBATT = 2.3V OUT I = 1mA, VBATT = 2.3V OUT VBATT - > V > ...
Page 4
... Note 8: The reset threshold tolerance is wider for V prevents internal oscillation. Note 9: The leakage current into or out of the RESET pin is tested with RESET asserted (RESET output high impedance). 4 _______________________________________________________________________________________ = 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S unless otherwise noted. Typical values are ...
Page 5
Microprocessor Supervisory Circuits __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted -to-V ON-RESISTANCE CC OUT vs. TEMPERATURE 5 VBATT = ...
Page 6
... Except for watchdog faults, reset will not assert as long as the power supply remains above 3.15V (3.3V - 5%). Reset is guaranteed to assert before the power supply falls below 3.0V. < The MAX690S/MAX704S/MAX805S are designed for CC 3.3V ±10% power supplies. Except for watchdog faults, they are guaranteed not to assert reset as long CC as the supply remains above 3 ...
Page 7
Microprocessor Supervisory Circuits V BATT BATTERY SWITCHOVER CIRCUITRY V CC BATTERY SWITCHOVER COMPARATOR 1.237V RESET COMPARATOR 1.237V * * WATCHDOG WDI TIMER ** MR PFI POWER-FAIL COMPARATOR V PFT * MAX690T/S/R, MAX802T/S/R, MAX804T/S/R, MAX805T/S/R ONLY ** MAX704T/S/R, MAX806T/S/R ONLY ...
Page 8
Microprocessor Supervisory Circuits Backup-Battery Switchover In the event of a brownout or power failure, it may be necessary to preserve the contents of RAM. With a backup battery installed at VBATT, the devices auto- matically switch RAM to backup ...
Page 9
Microprocessor Supervisory Circuits 3.0V OR 3.3V MAX690T/S MAX704T/S/R MAX802T/S/R 1N4148 MAX804T/S/R MAX805T/S/R VBATT MAX806T/S/R (RESET) 0.47F GND ARE FOR MAX804T/S/R, MAX805T/S/R ONLY Figure 3. Using a SuperCap as a Backup Power Source Connecting an ...
Page 10
Microprocessor Supervisory Circuits MAX690T/S/R PFI MAX704T/S/R MAX802T/S MAX804T/S/R MAX805T/S/R MAX806T/S/R C1* PFO TO μP PFO TRIP ( ...
Page 11
Microprocessor Supervisory Circuits BUFFERED RESET TO OTHER SYSTEM COMPONENTS V CC MAX690T/S/R 4.7kΩ MAX704T/S/R RESET MAX802T/S/R MAX806T/S/R GND Figure 6. Interfacing to µPs with Bidirectional Reset I/O 100 100 RESET COMPARATOR OVERDRIVE (V ...
Page 12
... SUBSTRATE IS CONNECTED TO THE HIGHER OF 8 Plastic DIP V OR VBATT, AND MUST BE FLOATED IN ANY HYBRID DESIGN. Dice* 8 Plastic DIP CERDIP Printed USA is a registered trademark of Maxim Integrated Products, Inc. V VBATT OUT 0.110" (2.794mm) RESET (RESET) WDI [MR] PFI PFO 0.080" (2.032mm) ...