Analog Devices

The ADM6710 is a low voltage, high accuracy supervisory circuit. The device monitors up to four system supply voltages.The ADM6710 incorporates a variety of internally pretrimmed undervoltage threshold options for monitoring 1.8 V, 2.5 V, 3.0 V, 3.3 V and 5.0 V supply voltages. The ADM6710Q offers three adjustable thresholds for monitoring voltages down to 0.62 V. See the Ordering Guide section for a list and description of all available options.If a monitored power supply voltage falls below the minimum voltage threshold, a single active low output asserts, triggering a system reset. The output is open-drain with a weak internal pull-up to the monitored IN2supply (or to VCCin the case of the ADM6710Q) of typically 10 μA. After all voltages rise above the selected threshold level, the reset signal remains low for the reset timeout period (200 ms typical).The ADM6710 output remains valid as long as IN1or IN2exceeds 1 V, whereas for the ADM6710Q, the output remains valid as long as VCCexceeds 2 V.Unused monitored inputs must not be allowed to float or to be grounded, instead they must be connected to a supply voltage greater than their specified threshold voltages. The ADM6710 is available in a 6-lead SOT-23 package. The device operates over the extended temperature range of −40°C to +125°C.APPLICATIONSTelecommunicationsMicroprocessor systemsDesktop and notebook computersData storage equipmentServers/workstations

The ADM6711/ADM6713 are reset generator circuits suitable for use in microprocessor-based systems. They provide a reset signal on power-up, power-down, and whenever the supply voltage falls below a preset threshold. In addition, both parts have a debounced manual reset input so that a reset signal can also be initiated with an external switch or logic signal.With six different reset threshold options available ranging from 2.32 V to 4.63 V, the ADM6711/ADM6713 are suitable for monitoring 2.5 V, 3 V, 3.3 V, and 5 V supplies. A reset timeout of at least 140 ms occurs when VCCrises above the threshold. This gives the supply voltage time to stabilize before the microprocessor starts up.The ADM6711 has a push-pull output, so no additional external components are needed. The ADM6713 open-drain output requires an external pull-up resistor that can be connected to a voltage higher than VCC, if desired.The parts are highly reliable with accurate voltage references and immunity to fast, negative-going transients on VCC. Low current consumption and space-efficient, 4-lead SC70 packaging make the ADM6711/ADM6713 ideal for use in low power portable applications.APPLICATIONSMicroprocessor systemsComputersControllersIntelligent instrumentsAutomotive systems

TheADM6711/ ADM6713 are reset generator circuits suitable for use in microprocessor-based systems. They provide a reset signal on power-up, power-down, and whenever the supply voltage falls below a preset threshold. In addition, both parts have a debounced manual reset input so that a reset signal can also be initiated with an external switch or logic signal.With six different reset threshold options available ranging from 2.32 V to 4.63 V, the ADM6711 / ADM6713 are suitable for monitoring 2.5 V, 3 V, 3.3 V, and 5 V supplies. A reset timeout of at least 140 ms occurs when VCCrises above the threshold. This gives the supply voltage time to stabilize before the microprocessor starts up.The ADM6711 has a push-pull output, so no additional external components are needed. The ADM6713 open-drain output requires an external pull-up resistor that can be connected to a voltage higher than VCC, if desired.The parts are highly reliable with accurate voltage references and immunity to fast, negative-going transients on VCC. Low current consumption and space-efficient, 4-lead SC70 packaging make the ADM6711 / ADM6713 ideal for use in low power portable applications.APPLICATIONSMicroprocessor systemsComputersControllersIntelligent instrumentsAutomotive systems

The ADM6819 andADM6820are simple power supply sequencers with FET drive capability for enhancing N Channel MOSFETs. These devices can monitor a primary supply voltage and enable/disable an external N-channel FET for a secondary supply. The ADM6819 has the ability to monitor two supplies. Where more than two voltages require sequencing multiple ADM6819 / ADM6820 devices can be cascaded to achieve this. The devices operate over a supply range of 2.7V to 5.5V.An internal comparator monitors the primary supply using the VSET pin. The input to this comparator is externally set via a resistor divider from the primary supply. When the voltage at the VSET pin rises above the comparator threshold, the secondary supply FET will be enhanced by an internal charge pump on the GATE output. The ADM6819 features an Enable (EN) pin which is fed to the input of an additional comparator and reference circuit. This pin can be used as a digital enable or a secondary power good comparator to monitor a second supply and only enable the GATE if both supplies are valid. When both the internal comparators inputs are above the threshold, a fixed 200ms timeout will occur before the GATE is driven high and the secondary supply is enabled.The ADM6820 has only one comparator which is on the SETV pin and features a timeout period which is adjustable via a single external capacitor on the SETD pin. The ADM6819 / ADM6820 are packaged in small 6-pin SOT-23 packages.APPLICATIONSMulti-Voltage SystemsDual Voltage Microprocessors/FPGAs/ASICs/DSPsNetwork ProcessorsTelecoms and Datacoms SystemsPC/Server Applications

TheADM6819and ADM6820 are simple power supply sequencers with FET drive capability for enhancing N Channel MOSFETs. These devices can monitor a primary supply voltage and enable/disable an external N-channel FET for a secondary supply. The ADM6819 has the ability to monitor two supplies. Where more than two voltages require sequencing multiple ADM6819/20 devices can be cascaded to achieve this. The devices operate over a supply range of 2.7V to 5.5V.An internal comparator monitors the primary supply using the VSET pin. The input to this comparator is externally set via a resistor divider from the primary supply. When the voltage at the VSET pin rises above the comparator threshold, the secondary supply FET will be enhanced by an internal charge pump on the GATE output. The ADM6819 features an Enable (EN) pin which is fed to the input of an additional comparator and reference circuit. This pin can be used as a digital enable or a secondary power good comparator to monitor a second supply and only enable the GATE if both supplies are valid. When both the internal comparators inputs are above the threshold, a fixed 200ms timeout will occur before the GATE is driven high and the secondary supply is enabled.The ADM6820 has only one comparator which is on the SETV pin and features a timeout period which is adjustable via a single external capacitor on the SETD pin. The ADM6819/20 are packaged in small 6-pin SOT-23 packages.APPLICATIONSMulti-Voltage SystemsDual Voltage Microprocessors/FPGAs/ASICs/DSPs/Network ProcessorsTelecoms and Datacoms SystemsPC/Server Applications

The ADM6823 is a low voltage, supervisory circuit that monitors power supply voltage levels and code execution integrity in micro-processor-based systems. As well as providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by means of an external push-button through a manual reset input.The part is available in nine reset threshold options, ranging from 1.58 V to 4.63 V (typical). The reset and watchdog timeout periods are fixed at 140 ms (minimum) and 1.6 sec (typical), respectively. Not all device models are released for sale as standard models. See the Ordering Guide for details.The ADM6823 is available in a 5-lead SOT-23 package and typically consumes only 7 μA, making it suitable for use in low power, portable applications.APPLICATIONSMicroprocessor systemsComputersControllersIntelligent instrumentsPortable equipment

The ADM690-ADM695family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The complete family provides a variety of configurations to satisfy most microprocessor system requirements.The ADM690,ADM692andADM694are available in 8-pin DIP packages and provide:Power-on reset output during power-up, power-down and brownout conditions. TheRESEToutput remains operational with VCCas low as 1 V.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 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a powerSupply other than +5 V.TheADM691,ADM693and ADM695 are available in 16-pin DIP and small outline packages and provide three additional functions.Write protection of CMOS RAM or EEPROM.Adjustable reset and watchdog timeout periods.Separate watchdog timeout, backup battery switchover, and low VCCstatus outputs.The ADM690-ADM695 family is fabricated using an advanced epitaxial CMOS process combining low power consumption (5 mW), extremely fast Chip Enable gating (5 ns) and high reliability.RESETassertion is guaranteed with VCCas low as 1 V. In addition, the power switching circuitry is designed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need for an external pass transistor.

The ADM691A /ADM693A/ ADM800L / ADM800M family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include mP reset, backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The family of products provides an upgrade for the MAX691A/93A/800M family of products.All parts are available in 16-pin DIP and SO packages. The ADM691A is also available in a space-saving TSSOP package. The following functionality is provided:Power-on reset output during power-up, power-down and brownout conditions. The circuitry remains operational with VCCas low as 1 V.Battery backup switching for CMOS RAM, CMOS micro-processor or other low power logic.A reset pulse if the optional watchdog timer has not been toggled within a specified time.A 1.25 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5 V.

TheADM690-ADM695family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The complete family provides a variety of configurations to satisfy most microprocessor system requirements.The ADM690,ADM692andADM694are available in 8-pin DIP packages and provide:Power-on reset output during power-up, power-down and brownout conditions. TheRESEToutput remains operational with VCCas low as 1 V.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 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5 V.The ADM691, ADM693 and ADM695 are available in 16-pin DIP and small outline packages and provide three additional functions.Write protection of CMOS RAM or EEPROM.Adjustable reset and watchdog timeout periods.Separate watchdog timeout, backup battery switchover, and low VCCstatus outputs.The ADM690-ADM695 family is fabricated using an advanced epitaxial CMOS process combining low power consumption (5 mW), extremely fast Chip Enable gating (5 ns) and high reliability. RESET assertion is guaranteed with VCCas low as 1 V. In addition, the power switching circuitry is designed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need for an external pass transistor.