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MAX691

Part Number	MAX691
Manufacturer	Maxim
Description	Microprocessor Supervisory Circuits
Published	May 2, 2005
Detailed Description	MAX690–MAX695 Microprocessor Supervisory Circuits General Description The MAX690 family of supervisory circuits reduce...
Datasheet	MAX691 PDF File

Overview

MAX690–MAX695 Microprocessor Supervisory Circuits General Description The MAX690 family of supervisory circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems.
These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning.
The MAX690 family significantly improves system reliability and accuracy compared to that obtainable with separate ICs or discrete components.
The MAX690, MAX692, and MAX694 are supplied in 8-pin packages and provide four functions: ●● A reset output during power-up, power-down, and brownout conditions.
●● Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic.
●● A Reset pulse if the optional watchdog timer has not been toggled within a specified time.
●● A 1.
3V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5V.
The MAX691, MAX693, and MAX695 are supplied in 16-pin packages and perform all MAX690, MAX692, MAX694 functions, plus: ●● Write protection of CMOS RAM or EEPROM.
●● Adjustable reset and watchdog timeout periods.
●● Separate outputs for indicating a watchdog timeout, backup-battery switchover, and low VCC.
Typical Operating Circuit +5V VCC VOUT POWER TO µP VBATT CMOS RAM POWER MAX690 µP SYSTEM PFI RESET PFO WDI GND µP RESET µP NMI I/O LINE MAX690 TYPICAL APPLICATION Benefits and Features ●● Supervisory Function Integration Saves Board Space while Fully Protecting Microprocessor-Based Systems • Precision Voltage Monitor -- 4.
65V (MAX690, MAX691, MAX694, MAX695) -- 4.
40V (MAX692, MAX693) • Power OK/Reset Time Delay -- 50ms, 200ms, or Adjustable • Watchdog Timer -- 100ms, 1.
6s, or Adjustable • Battery Backup Power Switching • Voltage Monitor for Power Fail or Low Battery Warning • Minimum External Component Count ●● Low Power Consumption in Battery Backup Mode Extends Battery Life •...

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