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MAX6894：Pin-Selectable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors

The MAX6892/MAX6893/MAX6894 pin-selectable, multivoltage supply sequencers/supervisors monitor several voltage-detector inputs and one watchdog input, asserting the respective voltage detector or watchdog output when the inputs drop below the configured voltage thresholds or the watchdog timer expires. The MAX6892 features eight voltage detector inputs and 10 outputs. The MAX6893 features six voltage-detector inputs and eight outputs, while the MAX6894 features four voltage detector inputs and six outputs. An active-low RESET output ensures all monitored inputs are above the set thresholds. The voltage detector outputs are configured as open drain. Manual reset and margin disable inputs offer additional flexibility. The thresholds of the MAX6892/MAX6893/MAX6894 are selected through five logic inputs (TH0–TH4). The logic on these five inputs selects the supply voltage tolerance (5% or 10%) and one of 32 factory-set thresholds settings. Watchdog and reset timeout periods can use factory default settings or are independently adjustable by connecting external capacitors. When any of the monitored voltages falls below its threshold, the respective output asserts and remains asserted for 6.25ms (typ) after the monitored voltage exceeds the threshold. The outputs can be connected to the shutdown or enable inputs of DC-DC regulators to provide turn-on power sequencing to ensure proper system initialization. The MAX6892 is available in a 5mm x 5mm x 0.8mm, 32-pin, Thin QFN package, while the MAX6893/MAX6894 are available in a 5mm x 5mm x 0.8mm, 28-pin, Thin QFN package. The MAX6892/MAX6893/MAX6894 are specified to operate over the extended temperature range (-40°C to +85°C).

Key Features Pin-Selectable or User-Adjustable Voltage Detector Thresholds Dedicated Active-Low RESET and Active-Low WDO Outputs Capacitor-Adjustable Reset and Watchdog Timeout Periods Factory-Default Reset and Watchdog Timeout Periods Up to Eight Independent, Open-Drain Power-Good Outputs Enable Margining Disable and Manual Reset Controls -40°C to +85°C Operating Temperature Range Small 5mm x 5mm Thin QFN Package Few External Components ±1% Threshold Accuracy

MAX6892, MAX6893, MAX6894: Typical Operating Circuit Applications/Uses Multimicroprocessor/Voltage Systems Networking Systems Servers and Workstations Storage Equipment Telecommunication/Central Office Systems Wireless Base Stations

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Related Products

• MAX6889：EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors
• MAX6886：Pin-Selectable, Hex Power-Supply Supervisory Circuit
• MAX6874：EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors
• MAX6872：EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors with Charge-Pump Outputs
• MAX6870：EEPROM-Programmable Hex/Quad Power-Supply Sequencers/Supervisors with ADC

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