Analog Devices Inc./Maxim Integrated

The MAX691A/MAX693A/MAX800L/MAX800M microprocessor (µP) supervisory circuits are pin-compatible upgrades to the MAX691, MAX693, and MAX695. They improve performance with 30µA supply current, 200ms typ reset active delay on power-up, and 6ns chip-enable propagation delay. Features include write protection of CMOS RAM or EEPROM, separate watchdog outputs, backup-battery switchover, and an active-low RESET output that is valid with VCCdown to 1V. The MAX691A/MAX800L have a 4.65V typical reset-threshold voltage, and the MAX693A/MAX800M's reset threshold is 4.4V typical. The MAX800L/MAX800M guarantee power-fail accuracies to ±2%.ApplicationsComputers: Desktop, Workstation, ServerControllersCritical µP MonitoringIntelligent Instruments

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 accu- racy 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.ApplicationsAutomotive SystemsComputersControllersCritical µP Power MonitoringIntelligent Instruments

The MAX6922/MAX6932/MAX6933/MAX6934 multi-output, 76V, vacuum-fluorescent display (VFD) tube drivers that interface a VFD tube to a microcontroller or a VFD controller, such as the MAX6850–MAX6853. The MAX6922/MAX6934 have 32 outputs, while the MAX6932 has 27 outputs, and the MAX6933 has 28 outputs. All devices are also suitable for driving telecom relays.Data is input using standard 4-wire serial interface (CLOCK, DATA, LOAD, BLANK) compatible with other VFD drivers and controllers.For easy display control, the active-high BLANK input forces all driver outputs low, turning the display off, and automatically puts the IC into shutdown mode. Display intensity may also be controlled by directly pulse-width modulating the BLANK input.The MAX6922/MAX6932/MAX6934 have a serial interface data output, DOUT, allowing any number of devices to be cascaded on the same serial interface.The MAX6932/MAX6933/MAX6934 have a negative supply voltage input, VSS, allowing the drivers' output swing to be made bipolar to simplify filament biasing in many applications.The MAX6922 is available in a 44-pin PLCC package, the MAX6932 and MAX6933 are available in 36-pin SSOP packages, and the MAX6934 is available in 44-pin PLCC and TQFN packages.Maxim also offers a 12-output VFD driver (MAX6920) and 20-output VFD drivers (MAX6921/MAX6931).ApplicationsAvionicsGaming MachinesIndustrial ControlIndustrial WeighingInstrumentationSecurityTelecomVFD ModulesWhite Goods

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 accu- racy 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.ApplicationsAutomotive SystemsComputersControllersCritical µP Power MonitoringIntelligent Instruments